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Liang S, Xu W, Hu L, Yrjänä V, Wang Q, Rosqvist E, Wang L, Peltonen J, Rosenholm JM, Xu C, Latonen RM, Wang X. Aqueous Processable One-Dimensional Polypyrrole Nanostructured by Lignocellulose Nanofibril: A Conductive Interfacing Biomaterial. Biomacromolecules 2023; 24:3819-3834. [PMID: 37437256 PMCID: PMC10428162 DOI: 10.1021/acs.biomac.3c00475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 06/29/2023] [Indexed: 07/14/2023]
Abstract
One-dimensional (1D) nanomaterials of conductive polypyrrole (PPy) are competitive biomaterials for constructing bioelectronics to interface with biological systems. Synergistic synthesis using lignocellulose nanofibrils (LCNF) as a structural template in chemical oxidation of pyrrole with Fe(III) ions facilitates surface-confined polymerization of pyrrole on the nanofibril surface within a submicrometer- and micrometer-scale fibril length. It yields a core-shell nanocomposite of PPy@LCNF, wherein the surface of each individual fibril is coated with a thin nanoscale layer of PPy. A highly positive surface charge originating from protonated PPy gives this 1D nanomaterial a durable aqueous dispersity. The fibril-fibril entanglement in the PPy@LCNFs facilely supported versatile downstream processing, e.g., spray thin-coating on glass, flexible membranes with robust mechanics, or three-dimensional cryogels. A high electrical conductivity in the magnitude of several to 12 S·cm-1 was confirmed for the solid-form PPy@LCNFs. The PPy@LCNFs are electroactive and show potential cycling capacity, encompassing a large capacitance. Dynamic control of the doping/undoping process by applying an electric field combines electronic and ionic conductivity through the PPy@LCNFs. The low cytotoxicity of the material is confirmed in noncontact cell culture of human dermal fibroblasts. This study underpins the promises for this nanocomposite PPy@LCNF as a smart platform nanomaterial in constructing interfacing bioelectronics.
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Affiliation(s)
- Shujun Liang
- Laboratory
of Natural Materials Technology, Faculty of Science and Engineering, Åbo Akademi Unversity, Henrikinkatu 2, Turku FI-20500, Finland
- Pharmaceutical
Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, Tykistökatu 6A, Turku FI-20520, Finland
| | - Wenyang Xu
- Laboratory
of Natural Materials Technology, Faculty of Science and Engineering, Åbo Akademi Unversity, Henrikinkatu 2, Turku FI-20500, Finland
| | - Liqiu Hu
- Laboratory
of Natural Materials Technology, Faculty of Science and Engineering, Åbo Akademi Unversity, Henrikinkatu 2, Turku FI-20500, Finland
| | - Ville Yrjänä
- Laboratory
of Molecular Science and Engineering, Faculty of Science and Engineering, Åbo Akademi University, Henrikinkatu 2, Turku FI-20500, Finland
| | - Qingbo Wang
- Laboratory
of Natural Materials Technology, Faculty of Science and Engineering, Åbo Akademi Unversity, Henrikinkatu 2, Turku FI-20500, Finland
| | - Emil Rosqvist
- Laboratory
of Molecular Science and Engineering, Faculty of Science and Engineering, Åbo Akademi University, Henrikinkatu 2, Turku FI-20500, Finland
| | - Luyao Wang
- Laboratory
of Natural Materials Technology, Faculty of Science and Engineering, Åbo Akademi Unversity, Henrikinkatu 2, Turku FI-20500, Finland
| | - Jouko Peltonen
- Laboratory
of Molecular Science and Engineering, Faculty of Science and Engineering, Åbo Akademi University, Henrikinkatu 2, Turku FI-20500, Finland
| | - Jessica M. Rosenholm
- Pharmaceutical
Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, Tykistökatu 6A, Turku FI-20520, Finland
| | - Chunlin Xu
- Laboratory
of Natural Materials Technology, Faculty of Science and Engineering, Åbo Akademi Unversity, Henrikinkatu 2, Turku FI-20500, Finland
| | - Rose-Marie Latonen
- Laboratory
of Molecular Science and Engineering, Faculty of Science and Engineering, Åbo Akademi University, Henrikinkatu 2, Turku FI-20500, Finland
| | - Xiaoju Wang
- Laboratory
of Natural Materials Technology, Faculty of Science and Engineering, Åbo Akademi Unversity, Henrikinkatu 2, Turku FI-20500, Finland
- Pharmaceutical
Sciences Laboratory, Faculty of Science and Engineering, Åbo Akademi University, Tykistökatu 6A, Turku FI-20520, Finland
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Rozi N, Hanifah SA, Abd Karim NH, Heng LY, Higashi SL, Ikeda M. Enhancing Electrochemical Biosensor Performance for 17β-Estradiol Determination with Short Split-Aptamers. BIOSENSORS 2022; 12:1077. [PMID: 36551044 PMCID: PMC9776344 DOI: 10.3390/bios12121077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/16/2022] [Accepted: 11/21/2022] [Indexed: 06/17/2023]
Abstract
Chronic exposure of 17β-estradiol (E2) even at low concentration can disorganize the endocrine system and lead to undesirable health problems in the long run. An electrochemical biosensor for rapid detection of E2 in water samples was successfully developed. The biosensor was based on split DNA aptamers attached onto poly (methacrylic acid-co-n butyl acrylate-succinimide) microspheres deposited on polypyrrole nanowires coated electrode (PPY/PMAA-NBA). The sandwich paired of split DNA aptamers used were truncated from 75 mer parent aptamers. These two strands of 12-mer and 14-mer split DNA aptamers were then immobilized on the PMAA-NBA microspheres. In the presence of E2, the split DNA aptamers formed an apt12-E2-apt14 complex, where the binding reaction on the electrode surface led to the detection of E2 by differential pulse voltammetry using ferrocyanide as a redox indicator. Under optimum conditions, the aptasensor detected E2 concentrations in the range of 1 × 10-4 M to 1 × 10-12 M (R2 = 0.9772) with a detection limit of 4.8 × 10-13 M. E2, which were successfully measured in a real sample with 97-104% recovery and showed a good correlation (R2 = 0.9999) with the established method, such as high-performance liquid chromatography. Interactions between short and sandwich-type aptamers (split aptamers) demonstrated improvement in aptasensor performance, especially the selectivity towards several potential interferents.
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Affiliation(s)
- Normazida Rozi
- Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Sharina Abu Hanifah
- Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
- Polymer Research Centre, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Nurul Huda Abd Karim
- Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Lee Yook Heng
- Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia
| | - Sayuri L. Higashi
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Masato Ikeda
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
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Abere Y, Helmick G, Blaisten-Barojas E. Modeling oxidised polypyrrole in the condensed phase with a novel force field. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:185701. [PMID: 34654003 DOI: 10.1088/1361-648x/ac303b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Accepted: 10/15/2021] [Indexed: 06/13/2023]
Abstract
A novel model potential is developed for simulating oxidised oligopyrroles in condensed phases. The force field is a coarse grained model that represents the pyrrole monomers as planar rigid bodies with fixed charge and dipole moment and the chlorine dopants as point atomic charges. The analytic function contains 17 adjustable parameters that are initially fitted on a database of small structures calculated within all-electron density functional theory. A subsequent potential function refinement is pursued with a battery of condensed phase isothermal-isobaric Metropolis Monte Carlo in-silico simulations at ambient conditions with the goal of implementing a hybrid parametrization protocol enabling agreement with experimentally known thermodynamic properties of oxidised polypyrrole. The condensed system is composed of oligomers containing 12 monomers with a 1:3 dopant-to-monomer concentration. The final set of force field optimised parameters yields an equilibrium density of the condensed system at ambient conditions in excellent agreement with oxidised polypyrrole samples synthesised in wet-laboratories.
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Affiliation(s)
- Yoseph Abere
- Center for Simulation and Modeling and Department of Computational and Data Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States of America
| | - Greg Helmick
- Center for Simulation and Modeling and Department of Computational and Data Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States of America
| | - Estela Blaisten-Barojas
- Center for Simulation and Modeling and Department of Computational and Data Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030, United States of America
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Taheri N, Khoshsafar H, Ghanei M, Ghazvini A, Bagheri H. Dual-template rectangular nanotube molecularly imprinted polypyrrole for label-free impedimetric sensing of AFP and CEA as lung cancer biomarkers. Talanta 2021; 239:123146. [PMID: 34942484 DOI: 10.1016/j.talanta.2021.123146] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 12/06/2021] [Accepted: 12/11/2021] [Indexed: 02/04/2023]
Abstract
A high-performance sensing layer based on dual-template molecularly imprinted polymer (DMIP) was fabricated and successfully applied for one-by-one detection of carcinoembryonic antigen (CEA) and alpha-fetoprotein (AFP) as lung cancer biomarkers. The plastic antibodies of AFP and CEA were created into the electropolymerized polypyrrole (PPy) on a fluorine-doped tin oxide (FTO) electrode. Raman spectroscopy, field emission scanning electron microscopy (FE-SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) tests were performed to pursue the formation and characterization of the sensing layer. Methyl orange (MO) increased the conductivity of PPy and induced the formation of MO doped PPy (PPy-MO) rectangular-shaped nanotubes. Using impedimetric detection, the rebinding of the template antigens was evaluated, the charge transfer resistance increased as the concentration of AFP and CEA increased. The linear dynamic ranges of 5-104 and 10-104 pg mL-1 and detection limits of 1.6 and 3.3 pg mL-1 were obtained for CEA and AFP, respectively. Given satisfactory results in the determination of AFP and CEA in the human serum samples, high sensitivity, and good stability of DMIP sensor made it a promising method for sensing of AFP and CEA in serum samples.
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Affiliation(s)
- Navid Taheri
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Hosein Khoshsafar
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Mostafa Ghanei
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Ali Ghazvini
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Hasan Bagheri
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran.
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Singh N, Aazam ES, Riaz U. Experimental and Computational Studies of Azo Dye-Modified Luminol Oligomers: Potential Application in Lithium Ion Sensing. ACS OMEGA 2021; 6:27833-27841. [PMID: 34722983 PMCID: PMC8552318 DOI: 10.1021/acsomega.1c03459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Accepted: 09/17/2021] [Indexed: 06/13/2023]
Abstract
With a view to design novel conjugated oligomers via a facile technique for its possible application in sensors, the present work reports oligomerization of Bismarck Brown (BB) dye with luminol. The structure was confirmed via IR studies, while the electronic transitions were confirmed by UV-visible studies. Morphological studies were carried out via SEM. Computational studies were carried out using the DFT method with a B3LYP 6-311G(d) basis set to investigate the optimized geometry, band gap, and vibrational and electronic transitions data. The HOMO-LUMO energies showed significant reduction in the band gap upon increasing the content of BB dye. The computational IR and UV spectra were noticed to be in close agreement with the experimental results. Spectrophotometric determination of Li ion was attempted using lithium chloride and a lithium carbonate drug commonly used in the treatment of bipolar disorder. The detection limit was noticed to be as low as 5.1 × 10-6 M, which could be used to design a Li ion sensor.
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Affiliation(s)
- Neetika Singh
- Materials Research Laboratory, Department of Chemistry,Jamia Millia Islamia, New Delhi 110025, India
| | - Elham S Aazam
- Chemistry Department, Faculty of Science, King Abdul Aziz University, Jeddah 23622, Saudia Arabia
| | - Ufana Riaz
- Materials Research Laboratory, Department of Chemistry,Jamia Millia Islamia, New Delhi 110025, India
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Nanodiamond surface chemistry controls assembly of polypyrrole and generation of photovoltage. Sci Rep 2021; 11:590. [PMID: 33437005 PMCID: PMC7803993 DOI: 10.1038/s41598-020-80438-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Accepted: 12/21/2020] [Indexed: 01/05/2023] Open
Abstract
Nanoscale composite of detonation nanodiamond (DND) and polypyrrole (PPy) as a representative of organic light-harvesting polymers is explored for energy generation, using nanodiamond as an inorganic electron acceptor. We present a technology for the composite layer-by-layer synthesis that is suitable for solar cell fabrication. The formation, pronounced material interaction, and photovoltaic properties of DND-PPy composites are characterized down to nanoscale by atomic force microscopy, infrared spectroscopy, Kelvin probe, and electronic transport measurements. The data show that DNDs with different surface terminations (hydrogenated, oxidized, poly-functional) assemble PPy oligomers in different ways. This leads to composites with different optoelectronic properties. Tight material interaction results in significantly enhanced photovoltage and broadband (1–3.5 eV) optical absorption in DND/PPy composites compared to pristine materials. Combination of both oxygen and hydrogen functional groups on the nanodiamond surface appears to be the most favorable for the optoelectronic effects. Theoretical DFT calculations corroborate the experimental data. Test solar cells demonstrate the functionality of the concept.
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Moučka R, Sedlačík M, Kasparyan H, Prokeš J, Trchová M, Hassouna F, Kopecký D. One-Dimensional Nanostructures of Polypyrrole for Shielding of Electromagnetic Interference in the Microwave Region. Int J Mol Sci 2020; 21:E8814. [PMID: 33233379 PMCID: PMC7700242 DOI: 10.3390/ijms21228814] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/18/2020] [Accepted: 11/19/2020] [Indexed: 01/22/2023] Open
Abstract
Polypyrrole one-dimensional nanostructures (nanotubes, nanobelts and nanofibers) were prepared using three various dyes (Methyl Orange, Methylene Blue and Eriochrome Black T). Their high electrical conductivity (from 17.1 to 60.9 S cm-1), good thermal stability (in the range from 25 to 150 °C) and resistivity against ageing (half-time of electrical conductivity around 80 days and better) were used in preparation of lightweight and flexible composites with silicone for electromagnetic interference shielding in the C-band region (5.85-8.2 GHz). The nanostructures' morphology and chemical structure were characterized by scanning electron microscopy, Brunauer-Emmett-Teller specific surface measurement and attenuated total reflection Fourier-transform infrared spectroscopy. DC electrical conductivity was measured using the Van der Pauw method. Complex permittivity and AC electrical conductivity of respective silicone composites were calculated from the measured scattering parameters. The relationships between structure, electrical properties and shielding efficiency were studied. It was found that 2 mm-thick silicone composites of polypyrrole nanotubes and nanobelts shield almost 80% of incident radiation in the C-band at very low loading of conductive filler in the silicone (5% w/w). Resulting lightweight and flexible polypyrrole composites exhibit promising properties for shielding of electromagnetic interference in sensitive biological and electronic systems.
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Affiliation(s)
- Robert Moučka
- Centre of Polymer Systems, Tomas Bata University in Zlín, 760 01 Zlín, Czech Republic;
| | - Michal Sedlačík
- Centre of Polymer Systems, Tomas Bata University in Zlín, 760 01 Zlín, Czech Republic;
- Department of Production Engineering, Faculty of Technology, Tomas Bata University in Zlín, Vavrečkova 275, 760 01 Zlín, Czech Republic
| | - Hayk Kasparyan
- Faculty of Chemical Engineering, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic; (H.K.); (F.H.)
| | - Jan Prokeš
- Faculty of Mathematics and Physics, Charles University, 180 00 Prague 8, Czech Republic;
| | - Miroslava Trchová
- Central Laboratory, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic;
| | - Fatima Hassouna
- Faculty of Chemical Engineering, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic; (H.K.); (F.H.)
| | - Dušan Kopecký
- Faculty of Chemical Engineering, University of Chemistry and Technology, Prague, 166 28 Prague 6, Czech Republic; (H.K.); (F.H.)
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Minisy IM, Bober P, Šeděnková I, Stejskal J. Methyl red dye in the tuning of polypyrrole conductivity. POLYMER 2020. [DOI: 10.1016/j.polymer.2020.122854] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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9
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Jia L, Liu W, Cao J, Wu Z, Yang C. Modified multi-walled carbon nanotubes assisted foam fractionation for effective removal of acid orange 7 from the dyestuff wastewater. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 262:110260. [PMID: 32090883 DOI: 10.1016/j.jenvman.2020.110260] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 02/09/2020] [Accepted: 02/10/2020] [Indexed: 06/10/2023]
Abstract
In this study, multi-walled carbon nanotubes (MWCNTs) had been used to strengthen the removal of acid orange 7 (AO7) from the dyestuff wastewater by using foam fractionation. First, the surface modification of MWCNTs was performed by introducing hypochlorite groups (-OCl). The modified MWCNTs were characterized by using SEM, XRD, FTIR and Raman spectroscopy. Subsequently, the potential of modified MWCNTs as a novel collector for AO7 adsorption was examined. The adsorption conditions of modified MWCNTs towards AO7 were optimized by using response surface methodology (RSM) with a central composite design (CCD). The adsorption capacity of modified MWCNTs towards AO7 could reach 47.72 ± 0.79 mg·g-1 under the optimum conditions. The kinetics and the equilibrium adsorption data were analyzed by using different kinetic and isotherm models. According to the regression results, adsorption kinetics data were well described by pseudo-second order model, whereas adsorption isotherm data were best represented by Langmuir isotherm model. Finally, foam fractionation was performed with a batch mode. Under the suitable conditions of loading liquid volume 300 mL, modified MWCNTs dosage 180 mg, cetyltrimethylammonium bromide (CTAB) concentration 50 mg·L-1, AO7 concentration 30 mg·L-1, pore diameter of gas distributor 0.125 mm and air flow rate 100 mL·min-1, the removal percentage and enrichment ratio of AO7 were 91.23% and 6.17, respectively. The decolourization ratio of solution after foam fractionation was found to be 98.66%.
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Affiliation(s)
- Lei Jia
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, Dingzi Gu, Hongqiao District, Tianjin, 300130, China
| | - Wei Liu
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, Dingzi Gu, Hongqiao District, Tianjin, 300130, China.
| | - Jilin Cao
- State Key Laboratory of Green Chemical Engineering and Efficient Energy Saving, School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China.
| | - Zhaoliang Wu
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, Dingzi Gu, Hongqiao District, Tianjin, 300130, China
| | - Chunyan Yang
- School of Chemical Engineering and Technology, Hebei University of Technology, No.8 Guangrong Road, Dingzi Gu, Hongqiao District, Tianjin, 300130, China
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Stejskal J. Interaction of conducting polymers, polyaniline and polypyrrole, with organic dyes: polymer morphology control, dye adsorption and photocatalytic decomposition. CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00982-9] [Citation(s) in RCA: 80] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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11
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Czaja T, Wójcik K, Grzeszczuk M, Szostak R. Polypyrrole⁻Methyl Orange Raman pH Sensor. Polymers (Basel) 2019; 11:E715. [PMID: 31010147 PMCID: PMC6523554 DOI: 10.3390/polym11040715] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 04/15/2019] [Accepted: 04/16/2019] [Indexed: 11/28/2022] Open
Abstract
An easy-to-prepare pH sensor based on electrochemically obtained polypyrrole doped with methyl orange ions is described. It enables the determination of a pH value in the 3-13 range for volumes below 1 µL. In a wide pH range, resonance and pre-resonance methyl orange Raman spectra, excited with the 514.5 nm line of an Ar+ laser, changed noticeably in function of H+ concentration. Two types of measurements were performed. In the first case, Raman spectra of the analyzed solutions were collected for samples placed on the sensor surface using a confocal microscope equipped with a 10x objective. Next, measurements were conducted for the same samples without the sensor. On the basis of these spectra, partial least-squares models were elaborated and validated. Relative standard errors of prediction for calibration, validation, and test samples were found to be in the 3.7%-3.9% range. An analogous model build using spectra registered without the sensor was characterized by slightly worse parameters.
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Affiliation(s)
- Tomasz Czaja
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Kamil Wójcik
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Maria Grzeszczuk
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
| | - Roman Szostak
- Department of Chemistry, University of Wrocław, F. Joliot-Curie 14, 50-383 Wrocław, Poland.
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12
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Trchová M, Stejskal J. Resonance Raman Spectroscopy of Conducting Polypyrrole Nanotubes: Disordered Surface versus Ordered Body. J Phys Chem A 2018; 122:9298-9306. [PMID: 30418028 DOI: 10.1021/acs.jpca.8b09794] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Polypyrrole nanotubes rank among the most conducting forms of organic semiconductors. They are prepared by the oxidation of pyrrole in the presence of methyl orange. Other organic dyes, viz. ethyl orange, Acid Blue 25, and Acid Blue 129, have been used in the present study to prepare globules or nanofibers. The resulting polypyrroles were studied in detail by Raman spectroscopy. The apparent paradox when a dye contribution to spectra is absent with 785 nm excitation line and present with shorter wavelengths is explained by the resonance character of the Raman scattering, which allows the separation of the contributions from the polypyrrole surface and from the bulk. These differ depending on the laser excitation wavelength and the position of absorption maximum of the individual dyes in ultraviolet-visible spectra and affect both the laser-penetration depth and observation of the resonance effect. The spectra are discussed in terms of different ordering of polymer chains in individual morphologies. The correlation between conductivity, surface areas, and the proportions of ordered and disordered polypyrrole phases at the surface and in the interior of nanostructures is proposed and established using resonance Raman spectroscopy.
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Affiliation(s)
- Miroslava Trchová
- Institute of Macromolecular Chemistry , Academy of Sciences of the Czech Republic , 162 06 Prague 6, Czech Republic
| | - Jaroslav Stejskal
- Institute of Macromolecular Chemistry , Academy of Sciences of the Czech Republic , 162 06 Prague 6, Czech Republic
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13
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Arivazhagan C, Satapathy S, Jana A, Malakar P, Prasad E, Ghosh S. Phenothiazine-Based Oligo(p
-phenylenevinylene)s: Substituents Affected Self-Assembly, Optical Properties, and Morphology-Induced Transport. Chemistry 2018; 24:13213-13222. [DOI: 10.1002/chem.201801810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 05/24/2018] [Indexed: 01/05/2023]
Affiliation(s)
- C. Arivazhagan
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Sitakanta Satapathy
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Arijit Jana
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Partha Malakar
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Edamana Prasad
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
| | - Sundargopal Ghosh
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600 036 India
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14
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Stejskal J. Strategies towards the control of one-dimensional polypyrrole nanomorphology and conductivity. POLYM INT 2018. [DOI: 10.1002/pi.5654] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jaroslav Stejskal
- Institute of Macromolecular Chemistry; Academy of Sciences of the Czech Republic; 162 06 Prague 6 Czech Republic
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15
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