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Dong X, Shi X, Cui Z, Dai W, Dong F. Dynamic Hydroxylation Enhances Hydrogen Atom Abstraction from Water for Nitrogen Fixation Revealed by Isotope Labeling in Situ Fourier-Transform Infrared Spectroscopy. ACS Nano 2024; 18:9670-9677. [PMID: 38516986 DOI: 10.1021/acsnano.4c00975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Employing water as a hydrogen source to participate in the hydrogen atom transfer (HAT) process is a low-cost and carbon-free process demonstrating great economic and environmental potential in catalysis. However, the low efficiency of hydrogen atom abstraction from water leads to slow kinetics of HAT for most hydrogenative reactions. Here, we prepared ultrathin Bi4O5Cl2 nanosheets where the surface can be in situ reconstructed via hydroxylation under light illumination to facilitate the abstraction of hydrogen atoms from pure water for efficient nitrogen fixation. Consequently, the isotope labeling in situ Fourier-transform infrared spectroscopy (FT-IR) involving H2O and D2O has clearly revealed that the hydroxyl groups tend to be adsorbed on the chloride vacancy sites on the Bi4O5Cl2 surface to form hydroxylated surfaces, where the hydroxylated photocatalyst surface enables partial dehydrogenation of water into H2O2, allowing the utilization of H atoms for efficient of N2 hydrogenation via HAT steps. This work elucidates the in-depth reaction mechanism of hydrogen atom extraction from H2O molecules via the light-generated chloride vacancy to promote photocatalytic nitrogen fixation, ultimately enabling the inspiration and providing crucial rules for the design of important functional materials that can efficiently deliver active hydrogen for chemical synthesis.
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Affiliation(s)
- Xing'an Dong
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, People's Republic of China
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, People's Republic of China
| | - Xian Shi
- School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong 643000, People's Republic of China
| | - Zhihao Cui
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Weidong Dai
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, People's Republic of China
| | - Fan Dong
- Research Center for Carbon-Neutral Environmental & Energy Technology, Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, People's Republic of China
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Somacescu S, Stanoiu A, Dinu IV, Calderon-Moreno JM, Florea OG, Florea M, Osiceanu P, Simion CE. CuWO 4 with CuO and Cu(OH) 2 Native Surface Layers for H 2S Detection under in-Field Conditions. Materials (Basel) 2021; 14:ma14020465. [PMID: 33478089 PMCID: PMC7835805 DOI: 10.3390/ma14020465] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/07/2021] [Accepted: 01/15/2021] [Indexed: 12/31/2022]
Abstract
The paper presents the possibility of detecting low H2S concentrations using CuWO4. The applicative challenge was to obtain sensitivity, selectivity, short response time, and full recovery at a low operating temperature under in-field atmosphere, which means variable relative humidity (%RH). Three different chemical synthesis routes were used for obtaining the samples labeled as: CuW1, CuW2, and CuW3. The materials have been fully characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). While CuWO4 is the common main phase with triclinic symmetry, different native layers of CuO and Cu(OH)2 have been identified on top of the surfaces. The differences induced into their structural, morphological, and surface chemistry revealed different degrees of surface hydroxylation. Knowing the poisonous effect of H2S, the sensing properties evaluation allowed the CuW2 selection based on its specific surface recovery upon gas exposure. Simultaneous electrical resistance and work function measurements confirmed the weak influence of moisture over the sensing properties of CuW2, due to the pronounced Cu(OH)2 native surface layer, as shown by XPS investigations. Moreover, the experimental results obtained at 150 °C highlight the linear sensor signal for CuW2 in the range of 1 to 10 ppm H2S concentrations and a pronounced selectivity towards CO, CH4, NH3, SO2, and NO2. Therefore, the applicative potential deserves to be noted. The study has been completed by a theoretical approach aiming to link the experimental findings with the CuW2 intrinsic properties.
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Affiliation(s)
- Simona Somacescu
- “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania; (S.S.); (J.M.C.-M.); (P.O.)
| | - Adelina Stanoiu
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania; (A.S.); (I.V.D.); (O.G.F.); (M.F.)
| | - Ion Viorel Dinu
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania; (A.S.); (I.V.D.); (O.G.F.); (M.F.)
| | - Jose Maria Calderon-Moreno
- “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania; (S.S.); (J.M.C.-M.); (P.O.)
| | - Ovidiu G. Florea
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania; (A.S.); (I.V.D.); (O.G.F.); (M.F.)
| | - Mihaela Florea
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania; (A.S.); (I.V.D.); (O.G.F.); (M.F.)
| | - Petre Osiceanu
- “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Spl. Independentei 202, 060021 Bucharest, Romania; (S.S.); (J.M.C.-M.); (P.O.)
| | - Cristian E. Simion
- National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania; (A.S.); (I.V.D.); (O.G.F.); (M.F.)
- Correspondence:
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Torres JA, Da Silva GTST, Barbosa de Freitas Silva F, Ribeiro C. Experimental Evidence of CO 2 Photoreduction Activity of SnO 2 Nanoparticles. Chemphyschem 2020; 21:2392-2396. [PMID: 33017501 DOI: 10.1002/cphc.202000786] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Indexed: 11/06/2022]
Abstract
Tin dioxide (SnO2 ) has intrinsic characteristics that do not favor its photocatalytic activity. However, we evidenced that surface modification can positively influence its performance for CO2 photoreduction in the gas phase. The hydroxylation of the SnO2 surface played a role in the CO2 affinity decreasing its reduction potential. The results showed that a certain selectivity for methane (CH4 ), carbon monoxide (CO), and ethylene (C2 H4 ) is related to different SnO2 hydrothermal annealing. The best performance was seen for SnO2 annealed at 150 °C, with a production of 20.4 μmol g-1 for CH4 and 16.45 μmol g-1 for CO, while for SnO2 at 200 °C the system produced more C2 H4 , probably due to a decrease of surface -OH groups.
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Affiliation(s)
- Juliana Arriel Torres
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, Zip Code, 13560-970, São Carlos, SP, Brazil
| | - Gelson T S T Da Silva
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, Zip Code, 13560-970, São Carlos, SP, Brazil
| | - Fernando Barbosa de Freitas Silva
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, Zip Code, 13560-970, São Carlos, SP, Brazil.,Department of Chemistry, Federal University of São Carlos (UFSCar), Zip Code, 13565-905, São Carlos, SP, Brazil
| | - Caue Ribeiro
- Nanotechnology National Laboratory for Agriculture (LNNA), Embrapa Instrumentation, Zip Code, 13560-970, São Carlos, SP, Brazil.,Department of Chemistry, Federal University of São Carlos (UFSCar), Zip Code, 13565-905, São Carlos, SP, Brazil
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Jordan T, O'Brien MA, Spatarelu CP, Luke GP. Antibody-Conjugated Barium Titanate Nanoparticles for Cell-Specific Targeting. ACS Appl Nano Mater 2020; 3:2636-2646. [PMID: 35873656 PMCID: PMC9307239 DOI: 10.1021/acsanm.0c00019] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Barium titanate nanoparticles (BTNPs) are gaining popularity in biomedical research because of their piezoelectricity, nonlinear optical properties, and high biocompatibility. However, the potential of BTNPs is limited by the ability to create stable nanoparticle dispersions in water and physiological media. In this work, we report a method of surface modification of BTNPs based on surface hydroxylation followed by covalent attachment of hydrophilic poly(ethylene glycol) (PEG) polymers. This polymer coating allows for additional modifications such as fluorescent labeling, surface charge tuning, or directional conjugation of IgG antibodies. We demonstrate the conjugation of anti-EGFR antibodies to the BTNP surface and show efficient molecular targeting of the nanoparticles to A431 cells. Overall, the reported modifications aim to expand the BTNP applications in molecular imaging, cancer therapy, or noninvasive neurostimulation.
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Affiliation(s)
- Tomas Jordan
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
| | - Mikaela A O'Brien
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States
| | | | - Geoffrey P Luke
- Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, United States; Translational Engineering in Cancer Research Program, Norris Cotton Cancer Center, Lebanon, New Hampshire 03766, United States
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Liu S, Xiu S, Shen B, Zhai J, Kong LB. Dielectric Properties and Energy Storage Densities of Poly(vinylidenefluoride) Nanocomposite with Surface Hydroxylated Cube Shaped Ba 0.6Sr 0.4TiO₃ Nanoparticles. Polymers (Basel) 2016; 8:E45. [PMID: 30979146 PMCID: PMC6432593 DOI: 10.3390/polym8020045] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Revised: 01/26/2016] [Accepted: 01/27/2016] [Indexed: 11/16/2022] Open
Abstract
Ceramic-polymer nanocomposites, consisting of surface hydroxylated cube-shaped Ba0.6Sr0.4TiO₃ nanoparticles (BST⁻NPs) as fillers and poly(vinylidenefluoride) (PVDF) as matrix, have been fabricated by using a solution casting method. The nanocomposites exhibited increased dielectric constant and improved breakdown strength. Dielectric constants of the nanocomposite with surface hydroxylated BST⁻NPs (BST⁻NPs⁻OH) were higher as compared with those of their untreated BST⁻NPs composites. The sample with 40 vol % BST⁻NPs⁻OH had a dielectric constant of 36 (1 kHz). Different theoretical models have been employed to predict the dielectric constants of the nanocomposites, in order to compare with the experimental data. The BST⁻NPs⁻OH/PVDF composites also exhibited higher breakdown strength than their BST⁻NP/PVDF counterparts. A maximal energy density of 3.9 J/cm³ was achieved in the composite with 5 vol % BST⁻NPs⁻OH. This hydroxylation strategy could be used as a reference to develop ceramic-polymer composite materials with enhanced dielectric properties and energy storage densities.
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Affiliation(s)
- Shaohui Liu
- Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
- School of Science, Henan Institute of Engineering, Zhengzhou 451191, China.
| | - Shaomei Xiu
- Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
| | - Bo Shen
- Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
| | - Jiwei Zhai
- Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, 4800 Caoan Road, Shanghai 201804, China.
| | - Ling Bing Kong
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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Schwaiger R, Schneider J, Bourret GR, Diwald O. Hydration of magnesia cubes: a helium ion microscopy study. Beilstein J Nanotechnol 2016; 7:302-9. [PMID: 27335725 PMCID: PMC4901542 DOI: 10.3762/bjnano.7.28] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 02/10/2016] [Indexed: 05/09/2023]
Abstract
Physisorbed water originating from exposure to the ambient can have a strong impact on the structure and chemistry of oxide nanomaterials. The effect can be particularly pronounced when these oxides are in physical contact with a solid substrate such as the ones used for immobilization to perform electron or ion microscopy imaging. We used helium ion microscopy (HIM) and investigated morphological changes of vapor-phase-grown MgO cubes after vacuum annealing and pressing into foils of soft and high purity indium. The indium foils were either used as obtained or, for reference, subjected to vacuum drying. After four days of storage in the vacuum chamber of the microscope and at a base pressure of p < 10(-7) mbar, we observed on these cubic particles the attack of residual physisorbed water molecules from the indium substrate. As a result, thin magnesium hydroxide layers spontaneously grew, giving rise to characteristic volume expansion effects, which depended on the size of the particles. Rounding of the originally sharp cube edges leads to a significant loss of the morphological definition specific to the MgO cubes. Comparison of different regions within one sample before and after exposure to liquid water reveals different transformation processes, such as the formation of Mg(OH)2 shells that act as diffusion barriers for MgO dissolution or the evolution of brucite nanosheets organized in characteristic flower-like microstructures. The findings underline the significant metastability of nanomaterials under both ambient and high-vacuum conditions and show the dramatic effect of ubiquitous water films during storage and characterization of oxide nanomaterials.
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Affiliation(s)
- Ruth Schwaiger
- Institute for Applied Materials (IAM) and Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Johannes Schneider
- Department of Chemistry and Physics of Materials, University of Salzburg, Hellbrunnerstrasse 34/ III, A-5020 Salzburg, Austria
| | - Gilles R Bourret
- Department of Chemistry and Physics of Materials, University of Salzburg, Hellbrunnerstrasse 34/ III, A-5020 Salzburg, Austria
| | - Oliver Diwald
- Department of Chemistry and Physics of Materials, University of Salzburg, Hellbrunnerstrasse 34/ III, A-5020 Salzburg, Austria
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