1
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Fung FM, Widyantoro C, Li SFY. Keeping Analytical Chemistry Training Up-to-Date. Anal Chem 2024; 96:6863-6869. [PMID: 38656177 DOI: 10.1021/acs.analchem.4c00407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/26/2024]
Abstract
The undergraduate analytical chemistry curriculum serves to equip students with the knowledge and skills for work outside of classroom training. As such, instructors face a challenging task in deciding the breadth and depth of topics for their courses to ensure their syllabi can remain up-to-date with today's needs. We propose that instructors consider covering capillary electrophoresis (CE) and lab-on-a-chip (LOC) technologies in their analytical chemistry courses. Past surveys of the curriculum show a noticeable lack of emphasis on these topics, which we feel is a missed opportunity and one that holds potential for the collective benefit of instructors and students. CE and LOCs are utilized in a diverse array of fields like biochemistry, pharmaceutical production, materials science, and environmental analysis, and their applications are becoming increasingly important amidst the growing movement toward environmentally sustainable practices and green chemistry. They are also more accessible in the analytical chemistry classroom compared with typical benchtop instruments due to the flexibility of their size and cost. This makes them easier to obtain, maintain, and transport for use and demonstration purposes. Additionally, interwoven in these topics are core concepts that are fundamental to analytical chemistry; thus, covering them will inherently reinforce students' understanding of fundamental knowledge. Therefore, we believe increased coverage of CE and LOCs can better prepare undergraduates for modern analytical chemistry work in various industries and fields of research.
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Affiliation(s)
- Fun Man Fung
- Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
- College of Humanities and Sciences, National University of Singapore, 21 Lower Kent Ridge Road, Singapore 119077
- Centre for Teaching, Learning and Technology, National University of Singapore,15 Kent Ridge Road, Singapore 119225
| | - Clarissa Widyantoro
- Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
- College of Humanities and Sciences, National University of Singapore, 21 Lower Kent Ridge Road, Singapore 119077
| | - Sam Fong Yau Li
- Department of Chemistry, Faculty of Science, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
- College of Humanities and Sciences, National University of Singapore, 21 Lower Kent Ridge Road, Singapore 119077
- NUS Environmental Research Institute (NERI), #02-01, T-Lab Building (TL), 5A Engineering Drive 1, Singapore 117411, Singapore
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2
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Li Y, Zhou Y, Guo W, Zhang X, Huang Y, He E, Li R, Yan B, Wang H, Mei F, Liu M, Zhu Z. Molecular Imaging Reveals Two Distinct Mixing States of PM 2.5 Particles Sampled in a Typical Beijing Winter Pollution Case. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:6273-6283. [PMID: 37022139 DOI: 10.1021/acs.est.2c08694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/19/2023]
Abstract
Mixing states of aerosol particles are crucial for understanding the role of aerosols in influencing air quality and climate. However, a fundamental understanding of the complex mixing states is still lacking because most traditional analysis techniques only reveal bulk chemical and physical properties with limited surface and 3-D information. In this research, 3-D molecular imaging enabled by ToF-SIMS was used to elucidate the mixing states of PM2.5 samples obtained from a typical Beijing winter haze event. In light pollution cases, a thin organic layer covers separated inorganic particles; while in serious pollution cases, ion exchange and an organic-inorganic mixing surface on large-area particles were observed. The new results provide key 3-D molecular information of mixing states, which is highly potential for reducing uncertainty and bias in representing aerosol-cloud interactions in current Earth System Models and improving the understanding of aerosols on air quality and human health.
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Affiliation(s)
- Ye Li
- Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China
- Division of Geochemistry, Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, United States
| | - Yadong Zhou
- Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Wenxiao Guo
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Xin Zhang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Ye Huang
- Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China
| | - Erkai He
- Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China
| | - Runkui Li
- State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| | - Beizhan Yan
- Division of Geochemistry, Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964, United States
| | - Hailong Wang
- Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Fan Mei
- Atmospheric Sciences and Global Change Division, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Min Liu
- Key Laboratory of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 500 Dongchuan Road, Minhang District, Shanghai 200241, China
| | - Zihua Zhu
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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3
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Iida S, Fisher GL, Miyayama T. Sample processing by Bi‐FIB for in situ TOF‐SIMS imaging of buried interfaces. SURF INTERFACE ANAL 2022. [DOI: 10.1002/sia.7179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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4
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Poly (vinylidene fluoride) solid polymer electrolyte structure revealed by secondary ion mass spectrometry. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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5
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Schneider P, Verloh F, Dürr M. Cluster-Induced Desorption/Ionization of Polystyrene: Desorption Mechanism and Effect of Polymer Chain Length on Desorption Probability. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2022; 33:832-839. [PMID: 35426303 DOI: 10.1021/jasms.2c00021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Soft cluster-induced desorption/ionization of polystyrene oligomers was investigated with respect to application in mass spectrometry. Clear peak progressions corresponding to intact polystyrene molecules were observed in the mass spectra, and no fragmentation was detected; efficient desorption was deduced from quartz crystal microbalance measurements. Molecular dynamics (MD) simulations of the process revealed that even in the case of the nonpolar polystyrene molecules cluster-induced desorption proceeds via dissolvation in the polar clusters. Experimentally, a significantly lower desorption efficiency was observed for polystyrene molecules with larger chain length. Taking into account MD simulations and further experiments with mixed samples consisting of long- and short-chain polystyrene oligomers, the reduced desorption efficiency for longer chain polystyrene molecules was attributed to a stronger entanglement of the larger polystyrene molecules.
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Affiliation(s)
- Pascal Schneider
- Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
| | - Felix Verloh
- Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
| | - Michael Dürr
- Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
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6
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Jeromel L, Ogrinc N, Siketić Z, Vavpetič P, Rupnik Z, Bučar K, Jenčič B, Kelemen M, Vencelj M, Vogel-Mikuš K, Kovač J, Heeren RMA, Flinders B, Cuypers E, Barba Ž, Pelicon P. Molecular imaging of humain hair with MeV-SIMS: A case study of cocaine detection and distribution in the hair of a cocaine user. PLoS One 2022; 17:e0263338. [PMID: 35333862 PMCID: PMC8956162 DOI: 10.1371/journal.pone.0263338] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 01/17/2022] [Indexed: 11/18/2022] Open
Abstract
Human hair absorbs numerous biomolecules from the body during its growth. This can act as a fingerprint to determine substance intake of an individual, which can be useful in forensic studies. The cocaine concentration profile along the growth axis of hair indicates the time evolution of the metabolic incorporation of cocaine usage. It could be either assessed by chemical extraction and further analysis of hair bundels, or by direct single hair fibre analysis with mass spectroscopy imaging (MSI). Within this work, we analyzed the cocaine distribution in individual hair samples using MeV-SIMS. Unlike conventional surface analysis methods, we demonstrate high yields of nonfragmented molecular ions from the surface of biological materials, resulting in high chemical sensitivity and non-destructive characterisation. Hair samples were prepared by longitudinally cutting along the axis of growth, leaving half-cylindrical shape to access the interior structure of the hair by the probing ion beam, and attached to the silicon wafer. A focused 5.8 MeV 35Cl6+ beam was scanned across the intact, chemically pristine hair structure. A non-fragmented protonated [M+ H]+ cocaine molecular peak at m/z = 304 was detected and localized along the cross-section of the hair. Its intensity exhibits strong fluctuations along the direction of the hair’s growth, with pronounced peaks as narrow as 50 micrometres, corresponding to a metabolic incorporation time of approx. three hours.
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Affiliation(s)
| | - Nina Ogrinc
- The Maastricht MultiModal Molecular Imaging Institute, Maastricht University, ER Maastricht, Maastricht, The Netherlands
| | | | | | | | | | | | | | | | - Katarina Vogel-Mikuš
- Jožef Stefan Institute, SI-Ljubljana, Slovenia
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Janez Kovač
- Jožef Stefan Institute, SI-Ljubljana, Slovenia
| | - Ron M. A. Heeren
- The Maastricht MultiModal Molecular Imaging Institute, Maastricht University, ER Maastricht, Maastricht, The Netherlands
| | - Bryn Flinders
- The Maastricht MultiModal Molecular Imaging Institute, Maastricht University, ER Maastricht, Maastricht, The Netherlands
| | - Eva Cuypers
- The Maastricht MultiModal Molecular Imaging Institute, Maastricht University, ER Maastricht, Maastricht, The Netherlands
- KU Leuven Toxicology & Pharmacology, Leuven, Belgium
| | - Žiga Barba
- Jožef Stefan Institute, SI-Ljubljana, Slovenia
- * E-mail:
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7
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Surface Analysis of Fermented Wheat and Rice Starch Used for Coating Traditional Korean Textiles. MATERIALS 2022; 15:ma15062001. [PMID: 35329454 PMCID: PMC8953288 DOI: 10.3390/ma15062001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Revised: 02/25/2022] [Accepted: 03/07/2022] [Indexed: 11/16/2022]
Abstract
Wheat and rice starches, traditionally used to stiffen fabric, become less contaminated and more antiseptic after fermentation for several years, thus enhancing their functional activity. In the present study, analytical techniques using particle size analysis, a gloss meter and a colorimeter were used to measure the physical properties of wheat and rice starches that had been fermented for 5 and 7 years, respectively. Their chemical contents and composition were determined by nutrient measurements and time-of-flight secondary ion mass spectrometry (ToF-SIMS). The ToF-SIMS spectra and ion images showed that fermented starch contained more carbohydrate and less lipid than fresh starch. The surface morphologies of the fermented starch granules and starch-coated textiles were examined by scanning electron microscopy and compared with the surface morphologies of fresh starch granules. The fermented wheat and rice starch granules were smaller and more rounded with a lower level of N-containing compounds (proteins) and exhibited more antiseptic properties than fresh starch granules. The results showed that physical measurements and chemical analysis were simple and complementary techniques for investigating traditional Korean starch materials and textiles.
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8
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Prasad A, Salim NV, Mozetič M, Kailas L, Thomas S. Time‐of‐flight secondary ion mass spectrometric analysis of polymer surfaces: A review. J Appl Polym Sci 2022. [DOI: 10.1002/app.52286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ananthu Prasad
- Faculty of Science, Engineering and Technology Swinburne University of Technology Victoria Australia
- International and Inter University Centre for Nanoscience and Nanotechnology (IIUCNN), Mahatma Gandhi University Kottayam Kerala India
| | - Nisa V. Salim
- Faculty of Science, Engineering and Technology Swinburne University of Technology Victoria Australia
| | - Miran Mozetič
- Department of Surface Engineering Jožef Stefan Institute Ljubljana Slovenia
| | | | - Sabu Thomas
- International and Inter University Centre for Nanoscience and Nanotechnology (IIUCNN), Mahatma Gandhi University Kottayam Kerala India
- School of Chemical Sciences, M G University Kottayam Kerala India
- Department of Chemical Sciences University of Johannesburg South Africa
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9
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Habumugisha T, Zhang Z, Ndayishimiye JC, Nkinahamira F, Kayiranga A, Cyubahiro E, Rehman A, Yan C, Zhang X. Evaluation and optimization of the influence of silver cluster ions on the MALDI-TOF-MS analysis of polystyrene nanoplastic polymers. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2022; 14:763-772. [PMID: 35112122 DOI: 10.1039/d1ay02219a] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
In the analysis of polystyrene nanoplastics (PSNs), a nonpolar polymer (NP), using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS), silver salts were used as cationization reagents and simultaneously brought the potential problems of silver clusters that interfered with the PSN signal of MS. To detect PSNs, silver trifluoroacetate (AgTFA) and silver nitrate (AgNO3) were mixed with five polar matrices, namely 2-(4-hydroxyphenylazo) benzoic acid (HABA), dithranol (DI), sinapic acid (SA), trans-3-indoleacrylic acid (IAA), and 2,5-dihydroxybenzoic acid (DHB), and three nonpolar matrices, namely pyrene (PRN), anthracene (ATH) and acenaphthene (ACTH). The results showed that silver salt cluster ions were detected in the range of m/z 1000-4000. Five polar matrices with silver salts produced silver clusters, which interfered with the signals in the mass spectrum of PSNs, but the combination of these matrices with copper II chloride (CuCl2) salt did not produce copper-related clusters. However, the use of nonpolar matrices such as PRN, ATH or ACTH significantly decreased the signals of silver salt cluster ions, and this alteration of matrix types is considered a promising optimization approach for silver cluster ions. The nonpolar matrix conditions were optimized without producing silver cluster ions and the optimal detection conditions were found to be under nonpolar matrices (e.g., pyrene) with silver salts (e.g., AgTFA). The results suggest that when polar matrices, such as HABA, DI, SA, IAA, and DHB, are combined with silver salts in MALDI-TOF-MS analysis, silver-related clusters are detected in the range of m/z 1000-4000. Inhibition of the production of silver cluster ions can be achieved by the use of a nonpolar matrix (e.g., PRN) or polar matrix (e.g., DHB) with copper salts.
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Affiliation(s)
- Théogène Habumugisha
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zixing Zhang
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
| | - Jean Claude Ndayishimiye
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - François Nkinahamira
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Alexis Kayiranga
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Eric Cyubahiro
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Abdul Rehman
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Changzhou Yan
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
| | - Xian Zhang
- Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
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10
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Kański M, Hrabar S, van Duin ACT, Postawa Z. Development of a Charge-Implicit ReaxFF for C/H/O Systems. J Phys Chem Lett 2022; 13:628-633. [PMID: 35019649 PMCID: PMC8785188 DOI: 10.1021/acs.jpclett.1c03867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/10/2022] [Indexed: 06/14/2023]
Abstract
Modeling chemical reactions in condensed phases is difficult. Interaction potentials (or force fields) like ReaxFF can perform this modeling with a high overall accuracy, but the disadvantage of ReaxFF is a low simulation speed arising from costly algorithms, in particular charge equilibration. Therefore, we reparametrized ReaxFF to incorporate Coulomb forces into other terms of the force field. Because of this change, our charge-implicit ReaxFF-CHO is >2 times faster than the original parametrization. Despite the lack of explicit electrostatic interactions, our potential can correctly model the reactions and densities of systems containing carbon, hydrogen, and oxygen atoms. We have used the new potential to simulate bombardment of trehalose by water clusters. It has been observed experimentally that these water projectiles can increase the sensitivity of secondary ion mass spectrometry by more than an order of magnitude, but no explanation for this phenomenon was given. Our simulations show that the increase in the intensity of the recorded signal coincides with the emission of trehalose-water complexes.
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Affiliation(s)
- Michał Kański
- Smoluchowski
Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
| | - Sviatoslav Hrabar
- Smoluchowski
Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
| | - Adri C. T. van Duin
- Department
of Mechanical Engineering, Pennsylvania
State University, University
Park, Pennsylvania 16802, United States
| | - Zbigniew Postawa
- Smoluchowski
Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30-348 Kraków, Poland
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11
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Fouquet TNJ, Amalian JA, Aniel N, Carvin-Sergent I, Issa S, Poyer S, Crozet D, Giusti P, Gigmes D, Trimaille T, Charles L. Reactive Desorption Electrospray Ionization Mass Spectrometry To Determine Intrinsic Degradability of Poly(lactic- co-glycolic acid) Chains. Anal Chem 2021; 93:12041-12048. [PMID: 34431672 DOI: 10.1021/acs.analchem.1c02280] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Because of its speed, sensitivity, and ability to scrutinize individual species, mass spectrometry (MS) has become an essential tool in analytical strategies aimed at studying the degradation behavior of polyesters. MS analyses can be performed prior to the degradation event for structural characterization of initial substrates or after it has occurred to measure the decreasing size of products as a function of time. Here, we show that MS can also be usefully employed during the degradation process by online monitoring the chain solvolysis induced by reactive desorption electrospray ionization (DESI). Cleavage of ester bonds in random copolymers of lactic acid (LA) and glycolic acid (GA) was achieved by electrospraying methanol-containing NaOH onto the substrates. Experimental conditions were optimized to generate methanolysis products of high abundance so that mass spectra can be conveniently processed using Kendrick-based approaches. The same reactive-DESI performance was demonstrated for two sample preparations, solvent casting for soluble samples or pressed pellets for highly crystalline substrates, permitting to compare polymers with LA/GA ratios ranging from 100/0 to 5/95. Analysis of sample fractions collected by size exclusion chromatography showed that methanolysis occurs independently of the original chain size, so data recorded for poly(LA-co-GA) (PLAGA) copolymers with the average molecular weight ranging from 10 to 180 kDa could be safely compared. The average mass of methanolysis products was observed to decrease linearly (R2 = 0.9900) as the GA content increases in PLAGA substrates, consistent with the susceptibility of ester bonds toward solvolysis being higher in GA than in LA. Because DESI only explores the surface of solids, these data do not reflect bulk degradability of the copolymers but, instead, their relative degradability at the molecular level. Based on a "reactive-DESI degradability scale" such as that established here for PLAGA, the proposed method offers interesting perspectives to qualify intrinsic degradability of different polyesters and evaluate their erosion susceptibility or to determine the degradability of those polymers known to degrade via erosion only.
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Affiliation(s)
- Thierry N J Fouquet
- Research Institute for Sustainable Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
| | - Jean-Arthur Amalian
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
| | - Nathan Aniel
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
| | - Isaure Carvin-Sergent
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
| | - Sébastien Issa
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
| | - Salomé Poyer
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
| | - Delphine Crozet
- Total Refining and Chemicals, Total Research & Technology Gonfreville, Harfleur 76700, France
| | - Pierre Giusti
- Total Refining and Chemicals, Total Research & Technology Gonfreville, Harfleur 76700, France.,International Joint laboratory-iC2MC: Complex Matrices Molecular Characterization, Harfleur 76700, France
| | - Didier Gigmes
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
| | - Thomas Trimaille
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
| | - Laurence Charles
- Aix Marseille Université, CNRS, UMR7273, Institut de Chimie Radicalaire, Marseille 13397, France
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12
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Cumpson PJ, Jaskiewicz M, Kim WK. Argon cluster‐ion sputter yield: Molecular dynamics simulations on silicon and equation for estimating total sputter yield. SURF INTERFACE ANAL 2021. [DOI: 10.1002/sia.6996] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Peter J. Cumpson
- NEXUS laboratory, School of Engineering Newcastle University Newcastle upon Tyne UK
- Now at Mark Wainwright Analytical Centre University of New South Wales Sydney New South Wales Australia
| | - Mieszko Jaskiewicz
- NEXUS laboratory, School of Engineering Newcastle University Newcastle upon Tyne UK
| | - Woo Kyun Kim
- Department of Mechanical and Materials Engineering University of Cincinnati Cincinnati Ohio USA
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13
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Detection of gold cysteine thiolate complexes on gold nanoparticles with time-of-flight secondary ion mass spectrometry. Biointerphases 2021; 16:021005. [PMID: 33810641 DOI: 10.1116/6.0000910] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Gold (Au) nanoparticles (NPs) are widely used in nanomedical applications as a carrier for molecules designed for different functionalities. Previous findings suggested that biological molecules, including amino acids, could contribute to the dissolution of Au NPs in physiological environments and that this phenomenon was size-dependent. We, therefore, investigated the interactions of L-cysteine with 5-nm Au NPs by means of time-of-flight secondary ion mass spectrometry (ToF-SIMS). This was achieved by loading Au NPs on a clean aluminum (Al) foil and immersing it in an aqueous solution containing L-cysteine. Upon rinsing off the excessive cysteine molecules, ToF-SIMS confirmed the formation of gold cysteine thiolate via the detection of not only the Au-S bond but also the hydrogenated gold cysteine thiolate molecular ion. The presence of NaCl or a 2-(N-morpholino)ethanesulfonic acid buffer disabled the detection of Au NPs on the Al foil. The detection of larger (50-nm) Au NPs was possible but resulted in weaker cysteine and gold signals, and no detected gold cysteine thiolate signals. Nano-gold specific adsorption of L-cysteine was also demonstrated by cyclic voltammetry using paraffine-impregnated graphite electrodes with deposited Au NPs. We demonstrate that the superior chemical selectivity and surface sensitivity of ToF-SIMS, via detection of elemental and molecular species, provide a unique ability to identify the adsorption of cysteine and formation of gold-cysteine bonds on Au NPs.
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14
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Vlasak PR, Pacholski ML, Kang JH, Kearns KL, Reinhardt CW. Part II: The influence of substrate type, film thickness, and primary ion type on molecular weight characterization of linear polydimethyl siloxane films by secondary ion mass spectrometry. SURF INTERFACE ANAL 2020. [DOI: 10.1002/sia.6921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | | | - Joo H. Kang
- Analytical Science Dow Chemical Co Midland Michigan USA
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15
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Schneider P, Verloh F, Portz A, Aoyagi S, Rohnke M, Dürr M. Direct Analysis of Ion-Induced Peptide Fragmentation in Secondary-Ion Mass Spectrometry. Anal Chem 2020; 92:15604-15610. [PMID: 33170642 DOI: 10.1021/acs.analchem.0c03765] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Primary-ion-induced fragmentation in organic molecules can strongly influence the results in secondary-ion mass spectrometry (SIMS) of organic and biomolecular samples. In order to characterize this ion-induced fragmentation, oligopeptide samples irradiated in SIMS experiments were investigated by means of desorption/ionization induced by neutral SO2 clusters (DINeC). The latter is a nondestructive desorption method for mass spectrometry of biomolecules, which gives direct access to the fragments induced in the sample. Comparison of TOF-SIMS and DINeC mass spectra revealed qualitative differences between the fragments, which remain in the sample and the fragments sputtered during ion bombardment. The fragmentation strength and its spatial distribution were found to be quantitatively different for Bi1+, Bi3+, and Ar1000+ primary ions, leading to different distributions of the degree of fragmentation in the samples as directly measured by means of DINeC depth profiles.
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Affiliation(s)
- P Schneider
- Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
| | - F Verloh
- Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany.,Physikalisch-Chemisches Institut and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany
| | - A Portz
- Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
| | - S Aoyagi
- Department of Materials and Life Science, Seikei University, 3-3-1, Kichijyoji-kitamachi, Musashino-shi, Tokyo 180-8633, Japan
| | - M Rohnke
- Physikalisch-Chemisches Institut and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 17, D-35392 Giessen, Germany
| | - M Dürr
- Institut für Angewandte Physik and Zentrum für Materialforschung, Justus-Liebig-Universität Giessen, Heinrich-Buff-Ring 16, D-35392 Giessen, Germany
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16
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Lee J, Terlier T, Jang YJ, Lee K, Lee Y. Structural colors and physical properties of elytra in the jewel beetle,
Chrysochroa fulgidissima
, using surface analytical techniques. SURF INTERFACE ANAL 2020. [DOI: 10.1002/sia.6807] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jihye Lee
- Advanced Analysis Center Korea Institute of Science and Technology Seoul South Korea
| | - Tanguy Terlier
- SIMS Laboratory, Shared Equipment Authority Rice University Houston Texas USA
| | - Yun Jung Jang
- Advanced Analysis Center Korea Institute of Science and Technology Seoul South Korea
- Department of Materials Science and Engineering Korea University Seoul South Korea
| | - Kang‐Bong Lee
- National Agenda Research Division Korea Institute of Science and Technology Seoul South Korea
| | - Yeonhee Lee
- Advanced Analysis Center Korea Institute of Science and Technology Seoul South Korea
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17
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Delcorte A, Delmez V, Dupont-Gillain C, Lauzin C, Jefford H, Chundak M, Poleunis C, Moshkunov K. Large cluster ions: soft local probes and tools for organic and bio surfaces. Phys Chem Chem Phys 2020; 22:17427-17447. [PMID: 32568320 DOI: 10.1039/d0cp02398a] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Ionised cluster beams have been produced and employed for thin film deposition and surface processing for half a century. In the last two decades, kiloelectronvolt cluster ions have also proved to be outstanding for surface characterisation by secondary ion mass spectrometry (SIMS), because their sputter and ion yields are enhanced in a non-linear fashion with respect to monoatomic projectiles, with a resulting step change of sensitivity for analysis and imaging. In particular, large gas cluster ion beams, or GCIB, have now become a reference in organic surface and thin film analysis using SIMS and X-ray photoelectron spectroscopy (XPS). The reason is that they induce soft molecular desorption and offer the opportunity to conduct damageless depth-profiling and 3D molecular imaging of the most sensitive organic electronics and biological samples, with a nanoscale depth resolution. In line with these recent developments, the present review focuses on rather weakly-bound, light-element cluster ions, such as noble or other gas clusters, and water or alcohol nanodroplets (excluding clusters made of metals, inorganic salts or ionic liquids) and their interaction with surfaces (essentially, but not exclusively, organic). The scope of this article encompasses three aspects. The first one is the fundamentals of large cluster impacts with surfaces, using the wealth of information provided by molecular dynamics simulations and experimental observations. The second focus is on recent applications of large cluster ion beams in surface characterisation, including mass spectrometric analysis and 2D localisation of large molecules, molecular depth-profiling and 3D molecular imaging. Finally, the perspective explores cutting edge developments, involving (i) new types of clusters with a chemistry designed to enhance performance for mass spectrometry imaging, (ii) the use of cluster fragment ion backscattering to locally retrieve physical surface properties and (iii) the fabrication of new biosurface and thin film architectures, where large cluster ion beams are used as tools to transfer biomolecules in vacuo from a target reservoir to any collector substrate.
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Affiliation(s)
- Arnaud Delcorte
- Université Catholique de Louvain, Institute of Condensed Matter and Nanoscience, 1 Place Louis Pasteur, 1348 Louvain-la-Neuve, Belgium.
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18
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Hou CH, Hung SH, Jhang LJ, Chou KJ, Hu YK, Chou PT, Su WF, Tsai FY, Shieh J, Shyue JJ. Validated Analysis of Component Distribution Inside Perovskite Solar Cells and Its Utility in Unveiling Factors of Device Performance and Degradation. ACS APPLIED MATERIALS & INTERFACES 2020; 12:22730-22740. [PMID: 32357293 DOI: 10.1021/acsami.9b22492] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Time-of-flight secondary-ion mass spectrometry (ToF-SIMS) has been used for gaining insights into perovskite solar cells (PSCs). However, the importance of selecting ion beam parameters to eliminate artifacts in the resulting depth profile is often overlooked. In this work, significant artifacts were identified with commonly applied sputter sources, i.e., an O2+ beam and an Ar-gas cluster ion beam (Ar-GCIB), which could lead to misinterpretation of the PSC structure. On the other hand, polyatomic C60+ and Ar+ ion beams were found to be able to produce depth profiles that properly reflect the distribution of the components. On the basis of this validated method, differences in component distribution, depending on the fabrication processes, were identified and discussed. The solvent-engineering process yielded a homogeneous film with higher device performance, but sequential deposition led to a perovskite layer sandwiched by methylammonium-deficient layers that impeded the performance. For device degradation, it was found that most components remained intact at their original position except for iodide. This result unambiguously indicated that iodide diffusion was one of the key factors governing the device lifetime. With the validated parameters provided, ToF-SIMS was demonstrated as a powerful tool to unveil the structure variation amid device performance and during degradation, which are crucial for the future development of PSCs.
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Affiliation(s)
- Cheng-Hung Hou
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Shu-Han Hung
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Li-Ji Jhang
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
| | - Keh-Jiunh Chou
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Yu-Kai Hu
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Pi-Tai Chou
- Department of Chemistry, National Taiwan University, Taipei 10617, Taiwan
| | - Wei-Fang Su
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Feng-Yu Tsai
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Jay Shieh
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
| | - Jing-Jong Shyue
- Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan
- Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
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19
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Gnaser H, Oki R, Aoki T, Seki T, Matsuo J. Optimized Alkali-Metal Cationization in Secondary Ion Mass Spectrometry of Polyethylene Glycol Oligomers with up to m/ z 10000: Dependence on Cation Species and Concentration. Anal Chem 2020; 92:1511-1517. [PMID: 31800216 DOI: 10.1021/acs.analchem.9b04770] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In secondary ion mass spectrometry (SIMS), the detection of large organic molecules is accomplished using cluster ion bombardment. Ion formation often proceeds via cationization, through the attachment of (alkali) metal ions to the molecule. To study this process, the emission of secondary ions sputtered from polyethylene glycol (PEG) samples with molecular weights (MW) of 1000-10000 was examined. They were mixed with alkali-metal trifluoroacetic acid (X-TFA, where X = Li, Na, K, or Cs) in a wide range of concentrations to investigate the efficiency of cationization for 10 keV Ar2000+ cluster irradiation. Typically, cationized molecular ions [M + X]+ (with repeat units n of up to ∼250, corresponding roughly to m/z 11000) and some characteristic fragment species were observed in the mass spectra. For all alkali cations, the oligomer intensities increase strongly with the molecular composition ratios X-TFA/PEG in the samples, and values of 5-10 seem to be optimal. With increasing molecular weight, the intensity of oligomer ions relative to the total number of ions decreases; as the latter remains rather constant, this implies that more fragment species are formed. The ion yields (detected ions per primary ions) of cationized [M + Na]+ oligomers sputtered from a PEG decrease very strongly with their size n: from 5.2 × 10-6 at n = 21 (MW ∼ 1000) to 4.5 × 10-10 at n ∼ 245 (MW ∼ 11000). By contrast, the total yields Ytot+ show only a small variation for these different specimens, from 1.3 × 10-5 to 3.7 × 10-5.
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Affiliation(s)
- Hubert Gnaser
- Quantum Science and Engineering Center , Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan.,Department of Physics , University of Kaiserslautern , 67663 Kaiserslautern , Germany
| | - Rika Oki
- Quantum Science and Engineering Center , Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Takaaki Aoki
- Department of Electronic Science and Engineering , Kyoto University , Nishikyo-ku , Kyoto 615-8510 , Japan
| | - Toshio Seki
- Department of Nuclear Engineering , Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan
| | - Jiro Matsuo
- Quantum Science and Engineering Center , Kyoto University , Gokasho, Uji , Kyoto 611-0011 , Japan.,SENTAN, Japan Science and Technology Agency (JST) , Chiyoda , Tokyo 102-0075 , Japan
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20
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Bülbül E, Rupper P, Geue T, Bernard L, Heuberger M, Hegemann D. Extending the Range of Controlling Protein Adsorption via Subsurface Architecture. ACS APPLIED MATERIALS & INTERFACES 2019; 11:42760-42772. [PMID: 31644873 DOI: 10.1021/acsami.9b14584] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Recently, it has been shown that water, confined in a plasma polymer subsurface chemical gradient, nanometers below the surface, significantly reduced the amount of adsorbed protein bovine serum albumin (BSA). Relating to this effect, we proposed the hypothesis that oriented water molecules within the subsurface gradient generate a long-range dipolar field, which interacts with dipolar proteins such as BSA near the surface region. This study extends the above used in situ multistep plasma deposition process to introduce plasma oxidation modifications of the subsurface architecture with the aim to further control the effect on protein adsorption. Neutron reflectivity measurements reveal that the oxidation time increases the amount of matrix-confined water. There is, however, an optimal oxidation time to obtain minimal protein adsorption, which suggests that a minimal distance between confined water molecules plays an important role. Altogether we can extend the range of controlling the adsorbed protein mass by the introduction of this additional plasma oxidation step.
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Affiliation(s)
- Ezgi Bülbül
- Laboratory for Advanced Fibers, Empa , Swiss Federal Laboratories for Materials Science and Technology , 9014 St. Gallen , Switzerland
- Laboratory for Surface Science and Technology, Department of Materials , ETH Zurich , 8093 Zurich , Switzerland
| | - Patrick Rupper
- Laboratory for Advanced Fibers, Empa , Swiss Federal Laboratories for Materials Science and Technology , 9014 St. Gallen , Switzerland
| | - Thomas Geue
- Laboratory for Neutron Scattering and Imaging , Paul Scherrer Institute , 5232 Villigen PSI , Switzerland
| | - Laetitia Bernard
- Laboratory for Nanoscale Materials Science, Empa , Swiss Federal Laboratories for Materials Science and Technology , 8600 Dübendorf , Switzerland
| | - Manfred Heuberger
- Laboratory for Advanced Fibers, Empa , Swiss Federal Laboratories for Materials Science and Technology , 9014 St. Gallen , Switzerland
- Laboratory for Surface Science and Technology, Department of Materials , ETH Zurich , 8093 Zurich , Switzerland
| | - Dirk Hegemann
- Laboratory for Advanced Fibers, Empa , Swiss Federal Laboratories for Materials Science and Technology , 9014 St. Gallen , Switzerland
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21
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Harvey SP, Zhang F, Palmstrom A, Luther JM, Zhu K, Berry JJ. Mitigating Measurement Artifacts in TOF-SIMS Analysis of Perovskite Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2019; 11:30911-30918. [PMID: 31373481 DOI: 10.1021/acsami.9b09445] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Time-of-flight secondary ion mass spectrometry (TOF-SIMS) is one of the few techniques that can specifically distinguish between organic cations such as methylammonium and formamidinium. Distinguishing between these two species can lead to specific insight into the origins and evolution of compositional inhomogeneity and chemical gradients in halide perovskite solar cells, which appears to be a key to advancing the technology. TOF-SIMS can obtain chemical information from hybrid organic-inorganic perovskite solar cells (PSCs) in up to three dimensions, while not simply splitting the organic components into their molecular constituents (C, H, and N for both methylammonium and formamidinium), unlike other characterization methods. Here, we report on the apparently ubiquitous A-site organic cation gradient measured when doing TOF-SIMS depth-profiling of PSC films. Using thermomechanical methods to cleave perovskite samples at the buried glass/transparent conducting oxide interface enables depth profiling in a reverse direction from normal depth profiling (backside depth profiling). When comparing the backside depth profiles to the traditional front side profiled devices, an identical slight gradient in the A-site organic cation signal is observed in each case. This indicates that the apparent A-site cation gradient is a measurement artifact due to beam damage from the primary ion beam causing a continually decreasing ion yield for secondary ions of methylammonium and formamidinium. This is due to subsurface implantation and bond breaking from the 30 keV bismuth primary ion beam impact when profiling with too high of a data density. Here, we show that the beam-generated artifact associated with this damage can mostly be mitigated by altering the measurement conditions. We also report on a new method of depth profiling applied to PSC films that enables enhanced sensitivity to halide ions in positive measurement polarity, which can eliminate the need for a second measurement in negative polarity in most cases.
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Affiliation(s)
- Steven P Harvey
- National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Fei Zhang
- National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Axel Palmstrom
- National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Joseph M Luther
- National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Kai Zhu
- National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
| | - Joseph J Berry
- National Renewable Energy Laboratory , Golden , Colorado 80401 , United States
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22
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Xu J, Zhong D, Chingin K, Song L, Chen H. Chemical Profiling of Bulk Alloys Using Micro-Electrochemical Probe Mass Spectrometry. Anal Chem 2019; 91:8304-8309. [PMID: 31055916 DOI: 10.1021/acs.analchem.9b01056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Micro-electrochemical probe mass spectrometry (μECP-MS) is demonstrated as a method for the direct profiling of chemical composition of bulk alloy samples without tedious sample pretreatment. The spatial distribution of Zn and Cu components of a Cu/Zn alloy sample was successively identified by scanning the electrolysis potential from -0.6 V to 0.6 V. The lateral resolution of alloy chemical profiling was ≤10 μm, and the depth resolution was ≤0.5 nm. Besides metal components, the method also allows the simultaneous detection of organic molecules on the sample surface. The limit of detection for Rhodamine B, Zn, and Cu depositions was 4.47, 9.58, and 24.25 ag per μm2, respectively. The method is particularly useful for high-throughput (<2 min per single run) quality monitoring of industrial parts and conductive materials of irregular geometries, such as alloy, microchips, solder side, etc.
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Affiliation(s)
- Jiaquan Xu
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation , East China University of Technology , Nanchang , 330013 , People's Republic of China
| | - Dacai Zhong
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation , East China University of Technology , Nanchang , 330013 , People's Republic of China
| | - Konstantin Chingin
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation , East China University of Technology , Nanchang , 330013 , People's Republic of China
| | - Lili Song
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation , East China University of Technology , Nanchang , 330013 , People's Republic of China
| | - Huanwen Chen
- Jiangxi Key Laboratory for Mass Spectrometry and Instrumentation , East China University of Technology , Nanchang , 330013 , People's Republic of China
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23
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Smith SC, Zhou C, Stevie FA, Garcia R. Imaging and quantitative analysis of insecticide in mosquito net fibers using Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS). PLoS One 2018; 13:e0209119. [PMID: 30586430 PMCID: PMC6306175 DOI: 10.1371/journal.pone.0209119] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 11/28/2018] [Indexed: 11/19/2022] Open
Abstract
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) analysis was used to qualitatively and quantitatively assess the distribution of permethrin insecticide on the surfaces and interiors of Olyset long-lasting insecticidal net (LLIN) fibers. Total insecticide content in LLINs has been established using many analytical methods. However, it is important to quantify the bioavailable portion residing on the fiber surfaces for incorporated LLINs. ToF-SIMS is a very surface sensitive technique and can directly image the spatial distribution of permethrin insecticide on the surface of Olyset fibers. Surface permethrin appeared as patchy deposits which were easily removed by acetone and reappeared after several days as interior permethrin migrated (bloomed) from the fiber interior. After a wash/incubation cycle, permethrin deposits were more diffuse and less concentrated than those on the as-received fibers. ToF-SIMS is particularly sensitive to detect the Cl- ion, which is the characteristic ion of permethrin. Ion implantation and quantification of dopants using SIMS is well established in the semiconductor industry. In this study, quantitative depth profiling was carried out using 35Cl- ion implantation to correlate secondary ion yield with permethrin concentration, yielding a limit of detection of 0.051 wt% for permethrin. In some cases, surface concentration differed greatly from the fiber interior (>1 μm below the surface). Two- and three-dimensional mapping of Cl at sub-micrometer resolution showed permethrin to be dissolved throughout the fiber, with about 2 vol% residing in disperse, high-concentration domains. This suggests that these fibers fall into the class of monolithic sustained-release devices. It is expected that ToF-SIMS can be a valuable tool to provide insight into the insecticide release behavior of other LLIN products, both current and future.
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Affiliation(s)
- Stephen C. Smith
- Division of Parasitic Diseases and Malaria, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America
- * E-mail:
| | - Chuanzhen Zhou
- Analytical Instrumentation Facility, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Fred A. Stevie
- Analytical Instrumentation Facility, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Roberto Garcia
- Analytical Instrumentation Facility, North Carolina State University, Raleigh, North Carolina, United States of America
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24
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Xie W, Weng LT, Yeung KL, Chan CM. Segregation of dioctyl phthalate to the surface of polystyrene films characterized by ToF-SIMS and XPS. SURF INTERFACE ANAL 2018. [DOI: 10.1002/sia.6524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Wenjing Xie
- Division of Environment and Sustainability; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
| | - Lu-Tao Weng
- Department of Chemical and Biological Engineering; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
- Materials Characterization and Preparation Facility; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
| | - King Lun Yeung
- Division of Environment and Sustainability; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
- Department of Chemical and Biological Engineering; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
| | - Chi-Ming Chan
- Division of Environment and Sustainability; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
- Department of Chemical and Biological Engineering; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
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25
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Fujiwara Y, Saito N. Cluster ion beam generation from a wetted needle emitter for organic secondary ion mass spectrometry (organic SIMS) using a protic ionic liquid, propylammonium nitrate. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2018; 32:1867-1874. [PMID: 30085370 DOI: 10.1002/rcm.8256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2018] [Revised: 07/24/2018] [Accepted: 07/29/2018] [Indexed: 06/08/2023]
Abstract
RATIONALE Propylammonium nitrate (PAN, [C3 H7 NH3 ][NO3 ]), a protic ionic liquid, has an active proton in its molecular structure, so that it can promote protonation. In addition, PAN has high aggregability, so that it tends to form large aggregated (or cluster) ions. These features will be desirable for cluster ion beams in secondary ion mass spectrometry (SIMS) of organic materials. The aggregability may enable us to generate a cluster ion beam from a needle tip wetted with PAN by electrospray in vacuum. For these reasons, cluster ion beam generation was investigated using an externally wetted needle emitter. METHODS A sharpened glass rod was used as a needle emitter. PAN was electrosprayed in vacuum using the needle emitter to generate a cluster ion beam. Beam characteristics were investigated with an apparatus for measuring transient responses of a beam current. SIMS experiments were also performed using the cluster ion beam as a primary ion beam; arginine and polyethylene glycol (PEG300) were analyzed. RESULTS A stable cluster ion beam was generated from the needle emitter wetted with PAN. The ion beam consisted of mixed cluster ions whose m/z ranged from about 180 to 5000 or higher. The cluster ion beam successfully produced protonated molecules [M + H]+ (M denotes arginine and PEG molecules) with relatively little fragmentation. Adduct ions [M + C3 H7 NH3 ]+ formed by propylammonium-attachment reaction were also detected for PEG. CONCLUSIONS It has been demonstrated that a needle emitter wetted with PAN can generate a cluster ion beam that includes massive cluster ions. The cluster ion beam proved to be helpful in producing molecular secondary ions and suitable for a primary ion beam in organic SIMS.
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Affiliation(s)
- Yukio Fujiwara
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
| | - Naoaki Saito
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
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26
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Tiddia M, Seah MP, Shard AG, Mula G, Havelund R, Gilmore IS. Argon cluster cleaning of Ga
+
FIB‐milled sections of organic and hybrid materials. SURF INTERFACE ANAL 2018. [DOI: 10.1002/sia.6522] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Mariavitalia Tiddia
- Dipartimento di FisicaUniversità degli Studi di Cagliari S. P. 8 Km 0.700 09042 Monserrato Italy
- National Physical Laboratory Hampton Road Teddington TW11 0LW UK
| | - Martin P. Seah
- National Physical Laboratory Hampton Road Teddington TW11 0LW UK
| | - Alex G. Shard
- National Physical Laboratory Hampton Road Teddington TW11 0LW UK
| | - Guido Mula
- Dipartimento di FisicaUniversità degli Studi di Cagliari S. P. 8 Km 0.700 09042 Monserrato Italy
| | - Rasmus Havelund
- National Physical Laboratory Hampton Road Teddington TW11 0LW UK
| | - Ian S. Gilmore
- National Physical Laboratory Hampton Road Teddington TW11 0LW UK
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27
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Ninomiya S, Sakai Y, Chuin Chen L, Hiraoka K. Development of a Vacuum Electrospray Droplet Ion Gun for Secondary Ion Mass Spectrometry. ACTA ACUST UNITED AC 2018; 7:A0069. [PMID: 30116686 PMCID: PMC6089089 DOI: 10.5702/massspectrometry.a0069] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 06/25/2018] [Indexed: 11/23/2022]
Abstract
Atmospheric pressure electrospray had been used in previous studies to generate massive water droplet ion beams, and the beams successfully achieved efficient desorption/ionization of biomolecules, low damage etching of polymers and nonselective etching of metal oxides. However, this droplet ion beam was not practical as a primary ion beam for surface analysis instruments because it required differential pumping and lacked adequate beam current and density. To improve the beam performance, we have proposed to use vacuum electrospray of aqueous solutions as a beam source, and developed a technique for producing a stable electrospray of aqueous solution in vacuum. We also designed a prototype of a vacuum electrospray droplet ion gun, and measured the beam properties. Finally, the applicability of this ion gun in secondary ion mass spectrometry is discussed.
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Affiliation(s)
- Satoshi Ninomiya
- Interdisciplinary Graduate School, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - Yuji Sakai
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - Lee Chuin Chen
- Interdisciplinary Graduate School, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
| | - Kenzo Hiraoka
- Clean Energy Research Center, University of Yamanashi, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan
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28
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Lee J, Jung SB, Terlier T, Lee KB, Lee Y. Molecular identification of Asian lacquers from different trees using Py-GC/MS and ToF-SIMS. SURF INTERFACE ANAL 2018. [DOI: 10.1002/sia.6460] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jihye Lee
- Advanced Analysis Center; Korea Institute of Science & Technology; Seoul 02792 South Korea
| | - Se-Bi Jung
- Advanced Analysis Center; Korea Institute of Science & Technology; Seoul 02792 South Korea
- Department of Chemistry; Korea University; Seoul 02841 South Korea
| | - Tanguy Terlier
- Advanced Analysis Center; Korea Institute of Science & Technology; Seoul 02792 South Korea
| | - Kang-Bong Lee
- Green City Technology Institute; Korea Institute of Science & Technology; Seoul 02792 South Korea
| | - Yeonhee Lee
- Advanced Analysis Center; Korea Institute of Science & Technology; Seoul 02792 South Korea
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29
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Madiona RM, Welch NG, Russell SB, Winkler DA, Scoble JA, Muir BW, Pigram PJ. Multivariate analysis of ToF-SIMS data using mass segmented peak lists. SURF INTERFACE ANAL 2018. [DOI: 10.1002/sia.6462] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Robert M.T. Madiona
- Centre for Materials and Surface Science and Department of Chemistry and Physics, School of Molecular Sciences; La Trobe University; Melbourne VIC 3086 Australia
- CSIRO Manufacturing; Clayton VIC 3168 Australia
| | - Nicholas G. Welch
- Centre for Materials and Surface Science and Department of Chemistry and Physics, School of Molecular Sciences; La Trobe University; Melbourne VIC 3086 Australia
- CSIRO Manufacturing; Clayton VIC 3168 Australia
| | - Stephanie B. Russell
- Centre for Materials and Surface Science and Department of Chemistry and Physics, School of Molecular Sciences; La Trobe University; Melbourne VIC 3086 Australia
| | - David A. Winkler
- CSIRO Manufacturing; Clayton VIC 3168 Australia
- Department of Biochemistry and Genetics, School of Molecular Sciences; La Trobe University; Bundoora VIC 3086 Australia
- Monash Institute of Pharmaceutical Sciences; Monash University; Parkville 3052 Australia
- School of Pharmacy; University of Nottingham; Nottingham NG7 2RD UK
| | | | | | - Paul J. Pigram
- Centre for Materials and Surface Science and Department of Chemistry and Physics, School of Molecular Sciences; La Trobe University; Melbourne VIC 3086 Australia
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Pogorelov AG, Gulin AA, Pogorelova VN, Panait AI, Pogorelova MA, Nadtochenko VA. The Use of ToF-SIMS for Analysis of Bioorganic Samples. Biophysics (Nagoya-shi) 2018. [DOI: 10.1134/s0006350918020197] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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Gates SD, Condit RC, Moussatche N, Stewart BJ, Malkin AJ, Weber PK. High Initial Sputter Rate Found for Vaccinia Virions Using Isotopic Labeling, NanoSIMS, and AFM. Anal Chem 2018; 90:1613-1620. [PMID: 29295620 DOI: 10.1021/acs.analchem.7b02786] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-lateral-resolution secondary ion mass spectrometry (SIMS) has the potential to provide functional and depth resolved information from small biological structures, such as viral particles (virions) and phage, but sputter rate and sensitivity are not characterized at shallow depths relevant to these structures. Here we combine stable isotope labeling of the DNA of vaccinia virions with correlated SIMS imaging depth profiling and atomic force microscopy (AFM) to develop a nonlinear, nonequilibrium sputter rate model for the virions and validate the model on the basis of reconstructing the location of the DNA within individual virions. Our experiments with a Cs+ beam show an unexpectedly high initial sputter rate (∼100 um2·nm·pA-1·s-1) with a rapid decline to an asymptotic rate of 0.7 um2·nm·pA-1·s-1 at an approximate depth of 70 nm. Correlated experiments were also conducted with glutaraldehyde-fixed virions, as well as O- and Ga+ beams, yielding similar results. Based on our Cs+ sputter rate model, the labeled DNA in the virion was between 50 and 90 nm depth in the virion core, consistent with expectations, supporting our conclusions. Virion densification was found to be a secondary effect. Accurate isotopic ratios were obtained from the initiation of sputtering, suggesting that isotopic tracers could be successfully used for smaller virions and phage.
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Affiliation(s)
| | - Richard C Condit
- Department of Molecular Genetics and Microbiology, University of Florida , Gainesville, Florida 32610, United States
| | - Nissin Moussatche
- Department of Molecular Genetics and Microbiology, University of Florida , Gainesville, Florida 32610, United States
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Abstract
As an antibiotic that prevents and treats infections caused by Gram-positive bacteria such as Staphylococcus aureus, vancomycin incorporated in a biodegradable polymer poly(lactide-co-glycolide) provides opportunities to construct controlled-release drug delivery systems. Developments associated with this promising system have been largely concentrated on areas of drug delivery kinetics and biodegradability. In order to provide surface analytical approaches to this important system, the authors demonstrate applicability of time-of-flight secondary ion mass spectrometry (TOF-SIMS) in three-dimensional molecular imaging for a model system consisting of alternating layers of ploy(lactide-co-glycolide) and vancomycin. TOF-SIMS imaging clarified that the two chemicals can undergo phase separation when dimethyl sulfoxide is used as the solvent. The authors identified two diagnostic ions that are abundant and structural moieties of vancomycin. The results on TOF-SIMS imaging and depth profiling vancomycin provide useful information for further applications of TOF-SIMS in the development of antibiotic drug delivery systems involving the use of vancomycin.
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Ng KM, Lau YTR, Weng LT, Yeung KL, Chan CM. ToF-SIMS and computation analysis: Fragmentation mechanisms of polystyrene, polystyrene-d5, and polypentafluorostyrene. SURF INTERFACE ANAL 2017. [DOI: 10.1002/sia.6361] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kai-Mo Ng
- Department of Chemical and Biological Engineering; Hong Kong
- Advanced Engineering Materials Facility; Hong Kong
| | - Yiu-Ting R. Lau
- Department of Chemical and Biological Engineering; Hong Kong
| | - Lu-Tao Weng
- Department of Chemical and Biological Engineering; Hong Kong
- Materials Characterization and Preparation Facility; Hong Kong
| | - King-Lun Yeung
- Department of Chemical and Biological Engineering; Hong Kong
- Division of Environment; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
| | - Chi-Ming Chan
- Department of Chemical and Biological Engineering; Hong Kong
- Division of Environment; Hong Kong University of Science and Technology; Clear Water Bay Hong Kong
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Fujiwara Y, Saito N. Time-of-flight secondary ion mass spectrometry using a new primary ion beam generated by vacuum electrospray of a protic ionic liquid, propylammonium nitrate. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:1859-1867. [PMID: 28815824 DOI: 10.1002/rcm.7960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 08/10/2017] [Accepted: 08/13/2017] [Indexed: 06/07/2023]
Abstract
RATIONALE Protic ionic liquids have the potential to be useful materials for primary ion beams in terms of protonation, since they have active protons. Selecting protic ionic liquids suitable for primary ion beams is of great importance to increase molecular secondary ion yields. Propylammonium nitrate ([C3 H7 NH3 ][NO3 ]) seems promising in view of its proton affinity. It is likely that [C3 H7 NH3 ]+ cations can act as proton donors, and [NO3 ]- anions can work as proton acceptors. METHODS Time-of-flight secondary ion mass spectrometry (TOF-SIMS) experiments have been performed to verify the usefulness of [C3 H7 NH3 ][NO3 ]. A primary propylammonium nitrate cluster ion beam was generated by vacuum electrospray, and then used to analyze amino acids (arginine, glutamic acid, aspartic acid), angiotensin II and polyethylene glycol. Positive and negative secondary ion mass spectra were obtained to study both protonation and deprotonation. RESULTS The propylammonium nitrate cluster ion beam successfully generated protonated molecules [M + H]+ of all the analytes in positive ion mode. The primary ion beam also generated deprotonated molecules [M - H]- of glutamic acid, aspartic acid and angiotensin II in negative ion mode. Additionally, adduct ions related to [C3 H7 NH3 ][NO3 ] were detected in the case of arginine and polyethylene glycol. CONCLUSIONS The TOF-SIMS experiments confirmed that the propylammonium nitrate cluster ion beam was useful in generating molecular secondary ions, demonstrating that it is well suited for a primary ion beam in TOF-SIMS.
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Affiliation(s)
- Yukio Fujiwara
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
| | - Naoaki Saito
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, 1-1-1 Umezono, Tsukuba-shi, Ibaraki-ken, 305-8568, Japan
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Kudriavtsev Y, Hernández A, Asomoza R, Korol V. Time-of-flight mass spectrometry depth profiling of sodium-implanted polyethylene terephthalate. SURF INTERFACE ANAL 2017. [DOI: 10.1002/sia.6264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yu Kudriavtsev
- Departamento Ingeniería Eléctrica-SEES; CINVESTAV-IPN; México 07360 Mexico
| | - A.G. Hernández
- Departamento Ingeniería Eléctrica-SEES; CINVESTAV-IPN; México 07360 Mexico
| | - R. Asomoza
- Departamento Ingeniería Eléctrica-SEES; CINVESTAV-IPN; México 07360 Mexico
| | - V.M. Korol
- Southern Federal University; Rostov-na-Dony Russia
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Paine MRL, Kooijman PC, Fisher GL, Heeren RMA, Fernández FM, Ellis SR. Visualizing molecular distributions for biomaterials applications with mass spectrometry imaging: a review. J Mater Chem B 2017; 5:7444-7460. [PMID: 32264222 DOI: 10.1039/c7tb01100h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Mass spectrometry imaging (MSI) is a rapidly emerging field that is continually finding applications in new and exciting areas. The ability of MSI to measure the spatial distribution of molecules at or near the surface of complex substrates makes it an ideal candidate for many applications, including those in the sphere of materials chemistry. Continual development and optimization of both ionization sources and analyzer technologies have resulted in a wide array of MSI tools available, both commercially available and custom-built, with each configuration possessing inherent strengths and limitations. Despite the unique potential of MSI over other chemical imaging methods, their potential and application to (bio)materials science remains in our view a largely underexplored avenue. This review will discuss these techniques enabling high parallel molecular detection, focusing on those with reported uses in (bio)materials chemistry applications and highlighted with select applications. Different technologies are presented in three main sections; secondary ion mass spectrometry (SIMS) imaging, matrix-assisted laser desorption ionization (MALDI) MSI, and emerging MSI technologies with potential for biomaterial analysis. The first two sections (SIMS and MALDI) discuss well-established methods that are continually evolving both in technological advancements and in experimental versatility. In the third section, relatively new and versatile technologies capable of performing measurements under ambient conditions will be introduced, with reported applications in materials chemistry or potential applications discussed. The aim of this review is to provide a concise resource for those interested in utilizing MSI for applications such as biomimetic materials, biological/synthetic material interfaces, polymer formulation and bulk property characterization, as well as the spatial and chemical distributions of nanoparticles, or any other molecular imaging application requiring broad chemical speciation.
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Affiliation(s)
- Martin R L Paine
- M4I, The Maastricht MultiModal Molecular Imaging Institute, Maastricht University, Maastricht 6229 ER, The Netherlands.
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Terlier T, Zappalà G, Marie C, Leonard D, Barnes JP, Licciardello A. ToF-SIMS Depth Profiling of PS-b-PMMA Block Copolymers Using Ar n+, C 60++, and Cs + Sputtering Ions. Anal Chem 2017; 89:6984-6991. [PMID: 28617583 DOI: 10.1021/acs.analchem.7b00279] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Time-of-flight secondary ion mass spectrometry (ToF-SIMS) is a high performance tool for molecular depth profiling of polymer films, in particular when they are structured in microphases. However, a major issue is the degradation of polymer materials under ion irradiation in reactions such as cross-linking, chain breaking, or reorganization processes of polymers which have been demonstrated for materials such as polystyrene (PS) and poly(methyl methacrylate) (PMMA). This work aims at comparing ToF-SIMS molecular depth profiling of structured polymers (polystyrene (PS)-b-polymethyl methacrylate (PMMA) block copolymers (BCP)) using either ultralow energy cesium or the more recently introduced C60++ (under NO dosing and with sample cooling) and argon cluster ion beams (using Ar1500+ ions at 5 keV). The latter improved the quality of the depth profiles, especially the argon cluster ion beam, as it is characterized by a greater homogeneity for the sputter yields of PS and PMMA. No significant artifacts were observed, and this was confirmed by the comparison of depth profiles obtained from films with variable thickness, annealing time, and morphology (cylindrical blocks vs spherical blocks). Comparison to a theoretical model (hexagonal centered pattern) ensured that the ToF-SIMS depth profiles described the real morphology and may thus be a relevant characterization tool to verify the morphology of the films as a function of the deposition parameters.
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Affiliation(s)
- T Terlier
- University Grenoble Alpes , F-38000 Grenoble, France.,CEA, LETI, MINATEC Campus, F-38054 Grenoble, France.,Univ Lyon, CNRS, Université Claude Bernard Lyon 1, ENS Lyon, Institut des Sciences Analytiques , UMR 5280, 5, rue de la Doua, F-69100 Villeurbanne, France
| | - G Zappalà
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania and CSGI , Viale A. Doria 6, 95125 Catania, Italy
| | - C Marie
- University Grenoble Alpes , F-38000 Grenoble, France.,CEA, LETI, MINATEC Campus, F-38054 Grenoble, France
| | - D Leonard
- Univ Lyon, CNRS, Université Claude Bernard Lyon 1, ENS Lyon, Institut des Sciences Analytiques , UMR 5280, 5, rue de la Doua, F-69100 Villeurbanne, France
| | - J-P Barnes
- University Grenoble Alpes , F-38000 Grenoble, France.,CEA, LETI, MINATEC Campus, F-38054 Grenoble, France
| | - A Licciardello
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania and CSGI , Viale A. Doria 6, 95125 Catania, Italy
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Mihara I, Havelund R, Gilmore IS. Embedding-Free Method for Preparation of Cross-Sections of Organic Materials for Micro Chemical Analysis Using Gas Cluster Ion Beam Sputtering. Anal Chem 2017; 89:4781-4785. [DOI: 10.1021/acs.analchem.7b00511] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ichiro Mihara
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, United Kingdom
- Kuraray Co., Ltd., 2045-1, Sakazu, Kurashiki, Okayama, 710-0801, Japan
| | - Rasmus Havelund
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, United Kingdom
| | - Ian S. Gilmore
- National Physical Laboratory, Hampton Road, Teddington, TW11 0LW, United Kingdom
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Naderi-Gohar S, Huang KMH, Wu Y, Lau WM, Nie HY. Depth profiling cross-linked poly(methyl methacrylate) films: a time-of-flight secondary ion mass spectrometry approach. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:381-388. [PMID: 27933719 DOI: 10.1002/rcm.7801] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 11/27/2016] [Accepted: 11/28/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE In order to determine the degree of cross-linking on the surface and its variations in a nanometer-scale depth of organic materials, we developed an approach based on time-of-flight secondary ion mass spectrometry (TOF-SIMS), which provides rich chemical information in the form of fragment ions. TOF-SIMS is extremely surface-sensitive and capable of depth profiling with the use of a sputter ion beam to remove controllable amounts of substance. METHODS Poly(methyl methacrylate) (PMMA) films spin-coated on a Si substrate were cross-linked using a recently developed, surface sensitive, hyperthermal hydrogen projectile bombardment technique. The ion intensity ratio between two ubiquitous hydrocarbon ions, C6 H- and C4 H- , detected in TOF-SIMS, denoted as ρ, was used to assess the degree of cross-linking of the PMMA films. The cross-linking depth of the PMMA films was revealed by depth profiling ρ into the polymer films using a C60+ sputter beam. RESULTS The control PMMA film spin-coated on a Si substrate was characterized by ρ = 32% on its surface when using a 25 keV Bi3+ primary ion beam. This parameter on the PMMA films subjected to HHIC treatment for 10, 100 and 500 s increased to 45%, 56% and 65%, respectively. The depth profiles of ρ obtained using a 10 keV C60+ ion beam resembled an exponential decay, from which the cross-linking depth was estimated to be 3, 15 and 39 nm, respectively, for the three cross-linked PMMA films. CONCLUSIONS We demonstrated that the ion intensity ratio of C6 H- to C4 H- detected in TOF-SIMS provides a unique and simple means to assess the degree of cross-linking of the surface of PMMA films cross-linked by the surface sensitive hyperthermal hydrogen projectile bombardment technique. With a C60+ sputter beam, we were able to depth profile the PMMA films and determine cross-linking depths of the cross-linked polymer films at nanometer resolutions. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Soheila Naderi-Gohar
- Surface Science Western, The University of Western Ontario, 999 Collip Circle, London, Ontario, N6G 0J3, Canada
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, N6A 3K7, Canada
- Advanced Mineral Technology Laboratory, 100 Collip Circle, London, Ontario, N6G 4X8, Canada
| | - Kevin M H Huang
- Surface Science Western, The University of Western Ontario, 999 Collip Circle, London, Ontario, N6G 0J3, Canada
- Amec Foster-Wheeler, 700 University Avenue, Toronto, Ontario, M5G 1X6, Canada
| | - Yiliang Wu
- Advanced Materials Laboratory, Xerox Research Centre of Canada, Mississauga, Ontario, L5K 2L1, Canada
- TE Connectivity, 306 Constitution Drive, Menlo Park, CA, 94025, USA
| | - Woon Ming Lau
- Chengdu Green Energy and Green Manufacturing Technology R&D Center, Chengdu, Sichuan, 610207, China
| | - Heng-Yong Nie
- Surface Science Western, The University of Western Ontario, 999 Collip Circle, London, Ontario, N6G 0J3, Canada
- Department of Physics and Astronomy, The University of Western Ontario, London, Ontario, N6A 3K7, Canada
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Improved 3D-imaging of a sirolimus/probucol eluting stent coating using laser postionization secondary neutral mass spectrometry and time-of-flight secondary ion mass spectrometry. Biointerphases 2016. [DOI: 10.1116/1.4964687] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Philipp P, Rzeznik L, Wirtz T. Numerical investigation of depth profiling capabilities of helium and neon ions in ion microscopy. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:1749-1760. [PMID: 28144525 PMCID: PMC5238654 DOI: 10.3762/bjnano.7.168] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Accepted: 11/02/2016] [Indexed: 06/02/2023]
Abstract
The analysis of polymers by secondary ion mass spectrometry (SIMS) has been a topic of interest for many years. In recent years, the primary ion species evolved from heavy monatomic ions to cluster and massive cluster primary ions in order to preserve a maximum of organic information. The progress in less-damaging sputtering goes along with a loss in lateral resolution for 2D and 3D imaging. By contrast the development of a mass spectrometer as an add-on tool for the helium ion microscope (HIM), which uses finely focussed He+ or Ne+ beams, allows for the analysis of secondary ions and small secondary cluster ions with unprecedented lateral resolution. Irradiation induced damage and depth profiling capabilities obtained with these light rare gas species have been far less investigated than ion species used classically in SIMS. In this paper we simulated the sputtering of multi-layered polymer samples using the BCA (binary collision approximation) code SD_TRIM_SP to study preferential sputtering and atomic mixing in such samples up to a fluence of 1018 ions/cm2. Results show that helium primary ions are completely inappropriate for depth profiling applications with this kind of sample materials while results for neon are similar to argon. The latter is commonly used as primary ion species in SIMS. For the two heavier species, layers separated by 10 nm can be distinguished for impact energies of a few keV. These results are encouraging for 3D imaging applications where lateral and depth information are of importance.
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Affiliation(s)
- Patrick Philipp
- Advanced Instrumentation for Ion Nano-Analytics (AINA), MRT Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, L-4422 Belvaux, Luxembourg
| | - Lukasz Rzeznik
- Advanced Instrumentation for Ion Nano-Analytics (AINA), MRT Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, L-4422 Belvaux, Luxembourg
| | - Tom Wirtz
- Advanced Instrumentation for Ion Nano-Analytics (AINA), MRT Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, L-4422 Belvaux, Luxembourg
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Turgut C, Sinha G, Lahtinen J, Nordlund K, Belmahi M, Philipp P. Optimizing the sputter deposition process of polymers for the Storing Matter technique using PMMA. JOURNAL OF MASS SPECTROMETRY : JMS 2016; 51:889-899. [PMID: 27747991 DOI: 10.1002/jms.3797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 06/01/2016] [Accepted: 06/03/2016] [Indexed: 06/06/2023]
Abstract
Quantitative analyses in secondary ion mass spectrometry (SIMS) become possible only if ionization processes are controlled. The Storing Matter technique has been developed to circumvent this so-called matrix effect, primarily for inorganic samples, but has also been extended to organic samples. For the latter, it has been applied to polystyrene in order to investigate the extent of damage in the polymer, its fragmentation during the sputter deposition process and the effect of the deposition process on the spectra taken by Time-of-Flight SIMS (ToF-SIMS). In this work, a multi-technique approach, which employs the Storing Matter technique for deposition and ToF-SIMS and X-ray photoelectron spectroscopy for characterization, is used to enhance the control of the deposition process, including the thickness of the deposit, the alteration of the source film and the influence of polymer composition on the Storing Matter process. Poly (methyl methacrylate) (PMMA) is used for this work. More detailed information about the sticking of polymer fragments on the metal collector is obtained by density functional theory calculations. This work allows for the conclusion that a part of the fragments deposited on the collector surface diffuses on the latter, reacts and recombines to form larger fragments. The behaviour observed for PMMA is similar to polystyrene, showing that oxygen has no major influence on the processes occurring during the sputter deposition process. Additionally, we have developed a new methodology using 2D ToF-SIMS images of the deposit to monitor the deposit thickness and to identify surface contaminations. The latter are not only located at the position of the deposit but all over the collector surface. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Canan Turgut
- Advanced Instrumentation for Ion Nano-Analytics (AINA), MRT Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, Belvaux, L-4422, Luxembourg
- Institut Jean Lamour (IJL) CNRS UMR 7198, Université de Lorraine, Faculté des Sciences et Technologies, BP 70239, Vandoeuvre -les-Nancy Cedex, F-54506, France
| | - Godhuli Sinha
- Department of Applied Physics, Aalto University School of Science, Aalto, FI-00076, Finland
| | - Jouko Lahtinen
- Department of Applied Physics, Aalto University School of Science, Aalto, FI-00076, Finland
| | - Kai Nordlund
- Department of Physics, University of Helsinki, PO Box 43, Helsinki, FI-00014, Finland
| | - Mohammed Belmahi
- Institut Jean Lamour (IJL) CNRS UMR 7198, Université de Lorraine, Faculté des Sciences et Technologies, BP 70239, Vandoeuvre -les-Nancy Cedex, F-54506, France
| | - Patrick Philipp
- Advanced Instrumentation for Ion Nano-Analytics (AINA), MRT Department, Luxembourg Institute of Science and Technology (LIST), 41 rue du Brill, Belvaux, L-4422, Luxembourg.
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Suzuki K, Kusakari M, Fujii M, Seki T, Aoki T, Matsuo J. Development of Low-vacuum SIMS instruments with large cluster Ion beam. SURF INTERFACE ANAL 2016. [DOI: 10.1002/sia.6121] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- K. Suzuki
- Department of Nuclear Engineering; Kyoto University; Uji, 611-0011 Kyoto Japan
| | - M. Kusakari
- Department of Nuclear Engineering; Kyoto University; Uji, 611-0011 Kyoto Japan
| | - M. Fujii
- Quantum Science and Engineering Center; Kyoto University; Uji, 611-0011 Kyoto Japan
| | - T. Seki
- Department of Nuclear Engineering; Kyoto University; Uji, 611-0011 Kyoto Japan
- SENTAN, Japan Science and Technology Agency (JST); Chiyoda 102-0075 Tokyo Japan
| | - T. Aoki
- Department of Electronic Science and Engineering; Kyoto University; Nishikyo 615-8510 Kyoto Japan
- SENTAN, Japan Science and Technology Agency (JST); Chiyoda 102-0075 Tokyo Japan
| | - J. Matsuo
- Quantum Science and Engineering Center; Kyoto University; Uji, 611-0011 Kyoto Japan
- SENTAN, Japan Science and Technology Agency (JST); Chiyoda 102-0075 Tokyo Japan
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Kawashima T, Morita H, Fukumoto N, Kurosawa T, Aoyagi S. Examination of ion beam induced damage on polymer surface using Ar clusters. SURF INTERFACE ANAL 2016. [DOI: 10.1002/sia.6097] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tomoko Kawashima
- Appliances Company; Panasonic Corporation; 3-4 Hikaridai, Seika-cho, Soraku-gun Kyoto Japan
| | - Hiromi Morita
- Advanced Research Division; Panasonic Corporation; 3-1-1 Yagumo-naka-machi, Moriguchi-shi Osaka Japan
| | - Noriaki Fukumoto
- Eco Solutions Company; Panasonic Corporation; 1048 Oazakadoma, Kadoma-shi Osaka Japan
| | - Takako Kurosawa
- Advanced Research Division; Panasonic Corporation; 3-1-1 Yagumo-naka-machi, Moriguchi-shi Osaka Japan
| | - Satoka Aoyagi
- Department of Materials and Life Science; Seikei University; 3-3-1 Kichijoji-kitamachi, Musashino-shi Tokyo Japan
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Surface Characterization of Polymer Blends by XPS and ToF-SIMS. MATERIALS 2016; 9:ma9080655. [PMID: 28773777 PMCID: PMC5509266 DOI: 10.3390/ma9080655] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 07/25/2016] [Accepted: 07/29/2016] [Indexed: 11/17/2022]
Abstract
The surface properties of polymer blends are important for many industrial applications. The physical and chemical properties at the surface of polymer blends can be drastically different from those in the bulk due to the surface segregation of the low surface energy component. X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary mass spectrometry (ToF-SIMS) have been widely used to characterize surface and bulk properties. This review provides a brief introduction to the principles of XPS and ToF-SIMS and their application to the study of the surface physical and chemical properties of polymer blends.
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Seah MP, Havelund R, Gilmore IS. Systematic Temperature Effects in the Argon Cluster Ion Sputter Depth Profiling of Organic Materials Using Secondary Ion Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:1411-1418. [PMID: 27106601 DOI: 10.1007/s13361-016-1401-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 03/30/2016] [Accepted: 03/31/2016] [Indexed: 06/05/2023]
Abstract
A study is presented of the effects of sample temperature on the sputter depth profiling of two organic materials, NPB (N,N'-Di(1-naphthyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4'-diamine) and Irganox 1010, using a 5 keV Ar2000 (+) cluster ion beam and analysis by secondary ion mass spectrometry. It is shown that at low temperatures, the yields increase slowly with temperature in accordance with the Universal Sputtering Yield equation where the energy term is now modified by Trouton's rule. This occurs up to a transition temperature, T T, which is, in turn, approximately 0.8T M, where T M is the sample melting temperature in Kelvin. For NPB and Irganox 1010, these transition temperatures are close to 15 °C and 0 °C, respectively. Above this temperature, the rate of increase of the sputtering yield rises by an order of magnitude. During sputtering, the depth resolution also changes with temperature with a very small change occurring below T T. At higher temperatures, the depth resolution improves but then rapidly degrades, possibly as a result first of local crater surface diffusion and then of bulk inter-diffusion. The secondary ion spectra also change with temperature with the intensities of the molecular entities increasing least. This agrees with a model in which the molecular entities arise near the crater rim. It is recommended that for consistent results, measurements for organic materials are always made at temperatures significantly below T T or 0.8 T M, and this is generally below room temperature. Graphical Abstract ᅟ.
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Affiliation(s)
- Martin P Seah
- Surface and Nanoanalysis, National Physical Laboratory, Teddington, Middlesex, TW11 0LW, England, UK.
| | - Rasmus Havelund
- Surface and Nanoanalysis, National Physical Laboratory, Teddington, Middlesex, TW11 0LW, England, UK
| | - Ian S Gilmore
- Surface and Nanoanalysis, National Physical Laboratory, Teddington, Middlesex, TW11 0LW, England, UK
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Fujii M, Shishido R, Satoh T, Suzuki S, Matsuo J. Effects of molecular weight and cationization agent on the sensitivity of Bi cluster secondary ion mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:1722-1726. [PMID: 28328033 DOI: 10.1002/rcm.7614] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2015] [Revised: 05/18/2016] [Accepted: 05/20/2016] [Indexed: 06/06/2023]
Abstract
RATIONALE Bi cluster secondary ion mass spectrometry (SIMS) is one of the most promising tools for precise analysis of synthetic polymers. However, the sensitivity in the high-mass region is still insufficient compared with matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS). Accordingly, the effects of metal assistance (cationization agents) were investigated in this study. METHODS To investigate the effects caused by varying the ionization agent, three different polyethylene glycol (PEG) samples were prepared, one with an Ag-deposited film, and two others mixed with Ag and Na, respectively. The measurements were performed by using a commercial Bi cluster SIMS and MALDI-TOFMS systems. The mass spectrum obtained with MALDI-TOFMS was used as a reference molecular weight distribution to evaluate the effects of molecular weight and primary ion species (Bi+ , Bi3+ , Bi32+ ) on the sensitivity of Bi cluster SIMS. RESULTS The intensity of each secondary ion was the highest in Bi32+ irradiation, and the lowest in Bi+ irradiation. Regarding the cationization agents, the secondary ion yield was the highest for the sample mixed with Ag, while the degree of decay of sensitivity along with the increase in molecular weight was the smallest for the sample mixed with Na. CONCLUSIONS It was suggested that the cationization mechanism consists of pre-formed ionization and gas-phase ionization processes. The sensitivity of Bi cluster SIMS decreases to approximately one-fiftieth in every 1000 u. These results might help in understanding the mechanism of cationization and further enhancement of secondary ion yields of polymers. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Makiko Fujii
- Quantum Science and Engineering Center, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
| | - Rie Shishido
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, 2-1-1, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
| | - Takaya Satoh
- JEOL Ltd., 3-1-2, Musashino, Akishima, Tokyo, 196-8558, Japan
| | - Shigeru Suzuki
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira, 2-1-1, Aoba-ku, Sendai, Miyagi, 980-8577, Japan
| | - Jiro Matsuo
- Quantum Science and Engineering Center, Kyoto University, Gokasho, Uji, Kyoto, 611-0011, Japan
- SENTAN, Japan Science and Technology Agency (JST), Chiyoda, Tokyo, 102-0075,, Japan
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Tian H, Wucher A, Winograd N. Reduce the matrix effect in biological tissue imaging using dynamic reactive ionization and gas cluster ion beams. Biointerphases 2016; 11:02A320. [PMID: 26856333 PMCID: PMC4752534 DOI: 10.1116/1.4941366] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 01/18/2016] [Accepted: 01/20/2016] [Indexed: 01/23/2023] Open
Abstract
In the context of a secondary ion mass spectrometry (SIMS) experiment, dynamic reactive ionization (DRI) involves introducing a reactive dopant, HCl, into an Ar gas cluster primary ion beam along with a source of water to enable dissociation of HCl to free protons. This concerted effect, precisely occurring at the impact site of the cluster beam, enhances the protonation of molecular species. Here, the authors apply this methodology to study the hippocampus and cerebellum region of a frozen-hydrated mouse brain section. To determine the degree of enhancement associated with DRI conditions, sequential tissue slices were arranged in a mirrored configuration so that comparable regions of the tissue could be explored. The results show that the protonated lipid species are increased by ∼10-fold, but that the normally prevalent salt adducts are virtually unaffected. This observation is discussed as a novel approach to minimizing SIMS matrix effects in complex materials. Moreover, the chemical images of protonated lipid ions exhibit clearer features in the cerebellum region as compared to images acquired with the pure Ar cluster beam.
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Affiliation(s)
- Hua Tian
- Chemistry Department, Pennsylvania State University, University Park, Pennsylvania 16802
| | - Andreas Wucher
- Fakultät für Physik, Universität Duisburg-Essen, 47048 Duisburg, Germany
| | - Nicholas Winograd
- Chemistry Department, Pennsylvania State University, University Park, Pennsylvania 16802
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