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Vinnacombe-Willson GA, Conti Y, Jonas SJ, Weiss PS, Mihi A, Scarabelli L. Surface Lattice Plasmon Resonances by Direct In Situ Substrate Growth of Gold Nanoparticles in Ordered Arrays. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2205330. [PMID: 35903851 PMCID: PMC9549758 DOI: 10.1002/adma.202205330] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/13/2022] [Indexed: 05/24/2023]
Abstract
Precise arrangements of plasmonic nanoparticles on substrates are important for designing optoelectronics, sensors and metamaterials with rational electronic, optical and magnetic properties. Bottom-up synthesis offers unmatched control over morphology and optical response of individual plasmonic building blocks. Usually, the incorporation of nanoparticles made by bottom-up wet chemistry starts from batch synthesis of colloids, which requires time-consuming and hard-to-scale steps like ligand exchange and self-assembly. Herein, an unconventional bottom-up wet-chemical synthetic approach for producing gold nanoparticle ordered arrays is developed. Water-processable hydroxypropyl cellulose stencils facilitate the patterning of a reductant chemical ink on which nanoparticle growth selectively occurs. Arrays exhibiting lattice plasmon resonances in the visible region and near infrared (quality factors of >20) are produced following a rapid synthetic step (<10 min), all without cleanroom fabrication, specialized equipment, or self-assembly, constituting a major step forward in establishing in situ growth approaches. Further, the technical capabilities of this method through modulation of the particle size, shape, and array spacings directly on the substrate are demonstrated. Ultimately, establishing a fundamental understanding of in situ growth has the potential to inform the fabrication of plasmonic materials; opening the door for in situ growth fabrication of waveguides, lasing platforms, and plasmonic sensors.
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Affiliation(s)
- Gail A Vinnacombe-Willson
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Ylli Conti
- Institute of Materials Science of Barcelona, ICMAB-CSIC, Campus UAB, Bellaterra, 08193, Spain
| | - Steven J Jonas
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- Department of Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Paul S Weiss
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- California NanoSystems Institute, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- Department of Bioengineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
- Department of Materials Science and Engineering, University of California, Los Angeles, Los Angeles, CA, 90095, USA
| | - Agustín Mihi
- Institute of Materials Science of Barcelona, ICMAB-CSIC, Campus UAB, Bellaterra, 08193, Spain
| | - Leonardo Scarabelli
- Institute of Materials Science of Barcelona, ICMAB-CSIC, Campus UAB, Bellaterra, 08193, Spain
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Araújo Lima EMD, Holanda VN, Ratkovski GP, Silva WVD, Nascimento PHD, Figueiredo RCBQD, de Melo CP. A new biocompatible silver/polypyrrole composite with in vitro antitumor activity. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 128:112314. [PMID: 34474865 DOI: 10.1016/j.msec.2021.112314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2021] [Revised: 06/30/2021] [Accepted: 07/07/2021] [Indexed: 12/01/2022]
Abstract
We used an in situ chemical oxidation method to prepare a new composite of silver nanoparticles (AgNPs) with polypyrrole (PPy), whose properties were optimized through a 23-factorial design of the synthesis conditions. The successful formation of the AgNPs/PPy composite was confirmed by UV-Visible and FTIR spectroscopies. Transmission electron microscopy revealed the presence of AgNPs smaller than 100 nm, dispersed into the PPy matrix. This hybrid composite exhibits a blue fluorescence emission after excitation in the ultraviolet region. In MTT assays, the AgNPs/PPy composite exhibited low cytotoxicity toward non-tumoral cell lines (fibroblast, Vero, and macrophages) and selectively inhibited the viability of HeLa cells. The AgNPs/PPy composite induces ultrastructural changes in HeLa cells that are consistent with the noticeable selectivity exhibited toward them when compared to its action against non-tumoral cell lineages. Also, the AgNPs/PPy exhibited a hemolytic activity below 14% for all blood groups tested, at concentrations up to 125 μg/mL. These results suggest that the AgNPs/PPy composite has a promising potential for use as an antitumoral agent.
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Affiliation(s)
- Elton Marlon de Araújo Lima
- Pós-graduação em Ciência de Materiais, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil; Laboratório de Biologia Celular de Patógenos, Instituto Aggeu Magalhães, Departamento de Microbiologia, Avenida Professor Moraes Rego, 1235, 50670-901 Recife, Pernambuco, Brazil; Departamento de Física, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
| | - Vanderlan Nogueira Holanda
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Avenida Professor Moraes Rego, 1235, 50670-901 Recife, PE, Brazil; Laboratório de Biologia Celular de Patógenos, Instituto Aggeu Magalhães, Departamento de Microbiologia, Avenida Professor Moraes Rego, 1235, 50670-901 Recife, Pernambuco, Brazil
| | - Gabriela Plautz Ratkovski
- Pós-graduação em Física, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil; Departamento de Física, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil
| | - Welson Vicente da Silva
- Laboratório de Biologia Celular de Patógenos, Instituto Aggeu Magalhães, Departamento de Microbiologia, Avenida Professor Moraes Rego, 1235, 50670-901 Recife, Pernambuco, Brazil
| | - Pedro Henrique do Nascimento
- Laboratório de Biologia Celular de Patógenos, Instituto Aggeu Magalhães, Departamento de Microbiologia, Avenida Professor Moraes Rego, 1235, 50670-901 Recife, Pernambuco, Brazil
| | - Regina Celia Bressan Queiroz de Figueiredo
- Laboratório de Biologia Celular de Patógenos, Instituto Aggeu Magalhães, Departamento de Microbiologia, Avenida Professor Moraes Rego, 1235, 50670-901 Recife, Pernambuco, Brazil
| | - Celso Pinto de Melo
- Pós-graduação em Ciência de Materiais, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil; Departamento de Física, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, 50670-901 Recife, Pernambuco, Brazil.
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3
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Zhang E, Liu W, Liu X, Zhao Z, Yang Y. Pulse electrochemical synthesis of polypyrrole/graphene oxide@graphene aerogel for high-performance supercapacitor. RSC Adv 2020; 10:11966-11970. [PMID: 35496620 PMCID: PMC9050804 DOI: 10.1039/d0ra01181a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 03/10/2020] [Indexed: 11/21/2022] Open
Abstract
A novel electroactive polypyrrole/graphene oxide@graphene aerogel (PGO@GA) was synthesized for the first time by pulse electropolymerization. The off-time in this technique allows polypyrrole (PPy) to go through a more stable structural arrangement, meanwhile its electronic transmission performance is enhanced by immobilizing graphene oxide between PPy chains. Moreover, graphene aerogel provides a three-dimensional structure with high conductivity to protect PPy from swelling and shrinking during the capacitive testing. Under these synergistic effects, PGO@GA presents exceptional capacitive performances including high specific capacitance (625 F g−1 at 1 A g−1), excellent rate capability (keeping 478 F g−1 at 15 A g−1 with retention rate of 76.5%), and excellent cycling life (retaining 85.7% of its initial value when cycling 5000 times at 10 A g−1). Therefore, the strategy adopted by this research provides a good reference for preparing other PPy-based electrode materials applied in the fields of catalysis, sensing, adsorption and energy storage. The as-prepared polypyrrole/graphene oxide@graphene aerogel by pulse electropolymerization technique presents excellent capacitive performance.![]()
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Affiliation(s)
- Erhui Zhang
- Key Lab of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education Taiyuan 030024 China .,College of Chemistry and Chemical Engineering, Taiyuan University of Technology Taiyuan 030024 China
| | - Weifeng Liu
- Key Lab of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education Taiyuan 030024 China .,Institute of New Carbon Materials, Taiyuan University of Technology Taiyuan 030024 China
| | - Xuguang Liu
- Key Lab of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education Taiyuan 030024 China .,Institute of New Carbon Materials, Taiyuan University of Technology Taiyuan 030024 China
| | - Zongbin Zhao
- Carbon Research Laboratory, Liaoning Key Lab for Energy Materials and Chemical Engineering, State Key Lab of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology Dalian 116023 China
| | - Yongzhen Yang
- Key Lab of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education Taiyuan 030024 China
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Sengupta P, Ghosh A, Bose N, Mukherjee S, Roy Chowdhury A, Datta P. A comparative assessment of poly(vinylidene fluoride)/conducting polymer electrospun nanofiber membranes for biomedical applications. J Appl Polym Sci 2020. [DOI: 10.1002/app.49115] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Pavel Sengupta
- Centre for Healthcare Science and TechnologyIndian Institute of Engineering Science and Technology Howrah West Bengal India
| | - Aritri Ghosh
- Centre for Healthcare Science and TechnologyIndian Institute of Engineering Science and Technology Howrah West Bengal India
| | - Navonil Bose
- Department of PhysicsSupreme Knowledge Foundation Group of Institutions Mankundu Hooghly India
| | - Sampad Mukherjee
- Department of PhysicsIndian Institute of Engineering Science and Technology Shibpur Howrah India
| | - Amit Roy Chowdhury
- Centre for Healthcare Science and TechnologyIndian Institute of Engineering Science and Technology Howrah West Bengal India
- Department of Aerospace Engineering and Applied MechanicsIndian Institute of Engineering Science and Technology Howrah West Bengal India
| | - Pallab Datta
- Centre for Healthcare Science and TechnologyIndian Institute of Engineering Science and Technology Howrah West Bengal India
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Polypyrrole inter-layered low temperature curing benzoxazine matrices with enhanced thermal and dielectric properties. JOURNAL OF POLYMER RESEARCH 2020. [DOI: 10.1007/s10965-020-2022-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Irfan M, Shakoor A, Majid A, Hassam N, Ahmed N. Study of Structural, Thermal and Dielectric Modulus of PPy–DBSA–Zirconium Oxide Composites. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2019. [DOI: 10.1134/s1990793119060198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Formation of Polyaniline and Polypyrrole Nanocomposites with Embedded Glucose Oxidase and Gold Nanoparticles. Polymers (Basel) 2019; 11:polym11020377. [PMID: 30960361 PMCID: PMC6419376 DOI: 10.3390/polym11020377] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 02/03/2019] [Accepted: 02/13/2019] [Indexed: 11/23/2022] Open
Abstract
Several types of polyaniline (PANI) and polypyrrole (Ppy) nanocomposites with embedded glucose oxidase (GOx) and gold nanoparticles (AuNPs) were formed by enzymatic polymerization of corresponding monomers (aniline and pyrrole) in the presence of 6 and 13 nm diameter colloidal gold nanoparticles (AuNPs(6nm) or AuNPs(13nm), respectively) or chloroaurate ions (AuCl4−). Glucose oxidase in the presence of glucose generated H2O2, which acted as initiator of polymerization reaction. The influence of polymerization bulk composition and pH on the formation of PANI- and Ppy-based nanocomposites was investigated spectrophotometrically. The highest formation rate of PANI- and Ppy-based nanocomposites with embedded glucose oxidase and gold nanoparticles (PANI/AuNPs-GOx and Ppy/AuNPs-GOx, respectively) was observed in the solution of sodium acetate buffer, pH 6.0. It was determined that the presence of AuNPs or AuCl4− ions facilitate enzymatic polymerization of aniline and pyrrole.
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Li JF, Zhang YJ, Ding SY, Panneerselvam R, Tian ZQ. Core-Shell Nanoparticle-Enhanced Raman Spectroscopy. Chem Rev 2017; 117:5002-5069. [PMID: 28271881 DOI: 10.1021/acs.chemrev.6b00596] [Citation(s) in RCA: 491] [Impact Index Per Article: 70.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Core-shell nanoparticles are at the leading edge of the hot research topics and offer a wide range of applications in optics, biomedicine, environmental science, materials, catalysis, energy, and so forth, due to their excellent properties such as versatility, tunability, and stability. They have attracted enormous interest attributed to their dramatically tunable physicochemical features. Plasmonic core-shell nanomaterials are extensively used in surface-enhanced vibrational spectroscopies, in particular, surface-enhanced Raman spectroscopy (SERS), due to the unique localized surface plasmon resonance (LSPR) property. This review provides a comprehensive overview of core-shell nanoparticles in the context of fundamental and application aspects of SERS and discusses numerous classes of core-shell nanoparticles with their unique strategies and functions. Further, herein we also introduce the concept of shell-isolated nanoparticle-enhanced Raman spectroscopy (SHINERS) in detail because it overcomes the long-standing limitations of material and morphology generality encountered in traditional SERS. We then explain the SERS-enhancement mechanism with core-shell nanoparticles, as well as three generations of SERS hotspots for surface analysis of materials. To provide a clear view for readers, we summarize various approaches for the synthesis of core-shell nanoparticles and their applications in SERS, such as electrochemistry, bioanalysis, food safety, environmental safety, cultural heritage, materials, catalysis, and energy storage and conversion. Finally, we exemplify about the future developments in new core-shell nanomaterials with different functionalities for SERS and other surface-enhanced spectroscopies.
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Affiliation(s)
- Jian-Feng Li
- State Key Laboratory for Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, iChEM, Xiamen University , Xiamen 361005, China.,Department of Physics, Xiamen University , Xiamen 361005, China
| | - Yue-Jiao Zhang
- State Key Laboratory for Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, iChEM, Xiamen University , Xiamen 361005, China
| | - Song-Yuan Ding
- State Key Laboratory for Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, iChEM, Xiamen University , Xiamen 361005, China
| | - Rajapandiyan Panneerselvam
- State Key Laboratory for Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, iChEM, Xiamen University , Xiamen 361005, China
| | - Zhong-Qun Tian
- State Key Laboratory for Physical Chemistry of Solid Surfaces, MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, College of Chemistry and Chemical Engineering, iChEM, Xiamen University , Xiamen 361005, China
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9
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Moarref P, Pishvaei M, Soleimani-Gorgani A, Najafi F. Synthesis of polypyrrole/indium tin oxide nanocomposites via miniemulsion polymerization. Des Monomers Polym 2015. [DOI: 10.1080/15685551.2015.1124321] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
Affiliation(s)
- Paria Moarref
- Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran
| | - Malihe Pishvaei
- Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran
| | - Atasheh Soleimani-Gorgani
- Department of Printing Science and Technology, Institute for Color Science and Technology, Tehran, Iran
| | - Farhood Najafi
- Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran
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11
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Muthuchamy N, Gopalan A, Lee KP. A new facile strategy for higher loading of silver nanoparticles onto silica for efficient catalytic reduction of 4-nitrophenol. RSC Adv 2015. [DOI: 10.1039/c5ra11892a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
The facile route to higher loading of silver nanoparticles onto a silica support is useful for large-scale synthesis of efficient silver supported catalysts.
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Affiliation(s)
- N. Muthuchamy
- Department of Chemistry Education
- Kyungpook National University
- Daegu
- South Korea
| | - A. Gopalan
- Research Institute of Advanced Energy Technology
- Kyungpook National University
- Daegu
- South Korea
- Department of Nanoscience and Nanotechnology
| | - Kwang-Pill Lee
- Department of Chemistry Education
- Kyungpook National University
- Daegu
- South Korea
- Research Institute of Advanced Energy Technology
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12
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Ghadimi H, Mahmoudian MR, Basirun WJ. A sensitive dopamine biosensor based on ultra-thin polypyrrole nanosheets decorated with Pt nanoparticles. RSC Adv 2015. [DOI: 10.1039/c5ra03521j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A Pt/UltraPPy modified glassy carbon electrode is a highly sensitive new sensor for the detection of dopamine.
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Affiliation(s)
- Hanieh Ghadimi
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - M. R. Mahmoudian
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
| | - Wan Jefrey Basirun
- Department of Chemistry
- Faculty of Science
- University of Malaya
- 50603 Kuala Lumpur
- Malaysia
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Zhang C, Zhang Z, Li G. Preparation of sulfonated graphene/polypyrrole solid-phase microextraction coating by in situ electrochemical polymerization for analysis of trace terpenes. J Chromatogr A 2014; 1346:8-15. [DOI: 10.1016/j.chroma.2014.04.043] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2014] [Revised: 04/14/2014] [Accepted: 04/15/2014] [Indexed: 10/25/2022]
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Single step in situ synthesis and optical properties of polyaniline/ZnO nanocomposites. ScientificWorldJournal 2014; 2014:904513. [PMID: 24523653 PMCID: PMC3910262 DOI: 10.1155/2014/904513] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Accepted: 10/03/2013] [Indexed: 11/23/2022] Open
Abstract
Polyaniline/ZnO nanocomposites were prepared by in situ oxidative polymerization of aniline monomer in the presence of different weight percentages of ZnO nanostructures. The steric stabilizer added to prevent the agglomeration of nanostructures in the polymer matrix was found to affect the final properties of the nanocomposite. ZnO nanostructures of various morphologies and sizes were prepared in the absence and presence of sodium lauryl sulphate (SLS) surfactant under different reaction conditions like in the presence of microwave radiation (microwave oven), under pressure (autoclave), under vacuum (vacuum oven), and at room temperature (ambient condition). The conductivity of these synthesized nanocomposites was evaluated using two-probe method and the effect of concentration of ZnO nanostructures on conductivity was observed. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and UV-visible (UV-VIS) spectroscopy techniques were used to characterize nanocomposites. The optical energy band gap of the nanocomposites was calculated from absorption spectra and ranged between 1.5 and 3.21 eV. The reported values depicted the blue shift in nanocomposites as compared to the band gap energies of synthesized ZnO nanostructures. The present work focuses on the one-step synthesis and potential use of PANI/ZnO nanocomposite in molecular electronics as well as in optical devices.
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Tsai TH, Yu CC, Liu YC, Yang KH. Effectively catalytic decomposition of acetaldehydes in spirits by using chitosan-capped gold nanoparticles. J Appl Polym Sci 2013. [DOI: 10.1002/app.39127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Saeed M, Shakoor A, Ahmad E. Temperature dependent electrical conductivity of polyaniline/Y2O3 composites. POLYMER SCIENCE SERIES A 2013. [DOI: 10.1134/s0965545x13080105] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Controllably catalytic decomposition of acetaldehyde in solution by using gold nanoparticles released from sonoelectrochemically prepared gold microsheets. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.04.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Chang CC, Yu CC, Liu YC, Yang KH. Al2O3-modified surface-enhanced Raman scattering-active gold nanoparticles on substrates by using sonoelectrochemical pulse deposition. J Electroanal Chem (Lausanne) 2013. [DOI: 10.1016/j.jelechem.2013.03.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Dipyrromethane as a new organic reagent for the synthesis of gold nanoparticles: preparation and application. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2013. [DOI: 10.1007/s13738-013-0253-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ou KL, Yang KH, Lo TY, Liu YC, Chen YZ. Strategy to controllably release gold nanoparticles from hexadecyltrimethylammonium bromide-capped gold microparticles. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.03.065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Chang CC, Yang KH, Liu YC, Hsu TC. New pathway to prepare gold nanoparticles and their applications in catalysis and surface-enhanced Raman scattering. Colloids Surf B Biointerfaces 2012; 93:169-73. [PMID: 22244302 DOI: 10.1016/j.colsurfb.2011.12.032] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Revised: 12/28/2011] [Accepted: 12/28/2011] [Indexed: 11/30/2022]
Abstract
As shown in the literature, additional energies are necessary for the reduction of positively charged noble metal ions to prepare metal nanoparticles (NPs). In this work, we report a new green pathway to prepare Au NPs in neutral 0.1M NaCl aqueous solutions from bulk Au substrates without addition of any stabilizer and reductant just via aid of natural chitosan (Ch) at room temperature. Au- and Ch-containing complexes in aqueous solution were electrochemically prepared. The role of Ch is just an intermediate to perform electron transfer with Au NPs. The stability of these prepared Au NPs is well maintained by Au NPs themselves with slightly positively charged Au remained on the surface of Au NPs. The particle size of prepared spherical Au (111) NPs is ca. 15 nm in diameter. Moreover, increasing the pH of preparation solutions can be contributive to preparing concentrated Au NPs in solutions. The prepared Au NPs are surface-enhanced Raman scattering (SERS)-active for probe molecules of Rhodamine 6G. They also demonstrate significantly catalytic activity for decomposition of acetaldehyde in rice wine.
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Affiliation(s)
- Chun-Chao Chang
- Division of Gastroenterology and Hepatology, Department of Internal Medicine, Taipei Medical University Hospital, Taipei, Taiwan
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Hu Y, Lu L, Liu J, Chen W. Direct growth of size-controlled gold nanoparticles on reduced graphene oxide film from bulk gold by tuning electric field: effective methodology and substrate for surface enhanced Raman scattering study. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm31483e] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Devi R, Yadav S, Pundir C. Au-colloids–polypyrrole nanocomposite film based xanthine biosensor. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2011.11.021] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Yan L, Cai Y, Zheng B, Yuan H, Guo Y, Xiao D, Choi MMF. Microwave-assisted synthesis of BSA-stabilized and HSA-protected gold nanoclusters with red emission. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c1jm13457d] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Kuo TC, Hsu TC, Liu YC, Yang KH. Size-controllable synthesis of surface-enhanced Raman scattering-active gold nanoparticles coated on TiO2. Analyst 2012; 137:3847-53. [DOI: 10.1039/c2an35269a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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26
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Ou KL, Yang KH, Liu YC, Hsu TC, Chen QY. New strategy to prepare enriched and small gold nanoparticles by sonoelectrochemical pulse methods. Electrochim Acta 2011. [DOI: 10.1016/j.electacta.2011.09.077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Lu X, Li Y, Zhang X, Du J, Zhou X, Xue Z, Liu X. A simple and an efficient strategy to synthesize multi-component nanocomposites for biosensor applications. Anal Chim Acta 2011; 711:40-5. [PMID: 22152794 DOI: 10.1016/j.aca.2011.11.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2011] [Revised: 10/27/2011] [Accepted: 11/02/2011] [Indexed: 10/15/2022]
Abstract
We demonstrate that core-shell multi-component nanocomposites can be grown in situ at room temperature by a novel one-step approach without adding any reductant and stabilizer. We have presented a one-step method for the synthesis of multi-component nanocomposites in water solution, the multi-component nanocomposites could be produced directly and quickly in an in situ wet-chemical reaction. Here, Au-polypyrrole (PPy)/Prussian blue (PB) nanocomposites have been synthesized successfully under the same circumstance. With the addition of pyrrole monomers into mixture solutions, the autopolymerization of pyrrole into PPy and AuCl(4)(-) was reduced to elemental Au instantaneously as well as simultaneously. At the same time, PB produced along with elemental Au serving as a catalyst. Furthermore, we investigated the performance of Au-PPy/PB nanocomposites as amperometric sensor toward the reduction of H(2)O(2), which displayed high sensitivity, fast response and good stability. The peak current of H(2)O(2) increased linearly with the concentration of H(2)O(2) in the range from 2.5×10(-9) to 1.2×10(-6)M, and the low detection limit of 8.3×10(-10)M (S/N=3) was obtained. Therefore, this work provides a new pathway to design and fabricate novel multi-component nanocomposites, which have unique characteristics and hold great applications in the fields of sensors, electrocatalysis and others.
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Affiliation(s)
- Xiaoquan Lu
- Key Laboratory of Bioelectrochemistry & Environmental Analysis of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou, China.
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Shivashankaraiah RB, Manjunatha H, Mahesh KC, Suresh GS, Venkatesha TV. Electrochemical characterization of polypyrrole–LiNi1/3Mn1/3Co1/3O2 composite cathode material for aqueous rechargeable lithium batteries. J Solid State Electrochem 2011. [DOI: 10.1007/s10008-011-1520-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Synergistic membrane of ZrO2/self-doped polyaniline nanofibres fabricated by controllable electrodeposition for DNA hybridization detection. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2010.12.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Lee KY, Lee YW, Lee JH, Han SW. Effect of ligand structure on the catalytic activity of Au nanocrystals. Colloids Surf A Physicochem Eng Asp 2010. [DOI: 10.1016/j.colsurfa.2010.10.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Li X, Liu J, Huang Q, Vogel W, Akins DL, Yang H. Effect of heat treatment on stability of gold particle modified carbon supported Pt–Ru anode catalysts for a direct methanol fuel cell. Electrochim Acta 2010. [DOI: 10.1016/j.electacta.2010.08.083] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Electrodeposition: a versatile and inexpensive tool for the synthesis of nanoparticles, nanorods, nanowires, and nanoclusters of metals. J APPL ELECTROCHEM 2010. [DOI: 10.1007/s10800-010-0234-3] [Citation(s) in RCA: 122] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Preparation of gold nanoparticles on eggshell membrane and their biosensing application. Talanta 2010; 82:177-83. [DOI: 10.1016/j.talanta.2010.04.014] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Revised: 04/07/2010] [Accepted: 04/08/2010] [Indexed: 11/17/2022]
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Routh P, Mukherjee P, Nandi AK. RNA-poly(o-methoxyaniline) hybrid templated growth of silver nanoparticles and nanojacketing: physical and electronic properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:5093-5100. [PMID: 20020756 DOI: 10.1021/la903553t] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Three nanobiocomposites (PRAg31, PRAg11, and PRAg13; the numbers indicate the weight ratios of poly(o-methoxyaniline) (POMA) and ribonucleic acid (RNA), respectively), produced from the same amount of POMA (P) and silver nitrate (AgNO(3)) with differing proportions of RNA (R) are prepared by aging the aqueous solutions of the mixture for 3 weeks at 30 degrees C. The scanning and transmission electron microscopy (SEM and TEM) indicate Ag nanoparticle formation on the hybrid fiber surface and in the PRAg31 system the hybrid fibrils become coated with metallic Ag, the phenomenon being termed as "nanojacketting". The circular dichroism (CD) spectra indicate a small distortion of RNA conformation from A helix toward B helix. FTIR and UV-vis spectra suggest that POMA (emeraldine base, EB) being doped by Ag(+) become oxidized to its pernigraniline base (PB) form and reduce Ag(+) to metallic Ag. The Ag nanoparticles thus produced become stabilized on the fibril surface by co-ordination through nitrogen atoms of POMA (PB) chains. The much slower red shift of pi band to polaron band transition peak in PRAg31 than that of the other two nanobiocomposites is indicative of difficulty in conformational transitions of POMA chain in the "nanojacketted" hybrid fibrils. The dc-conductivity values of the nanobiocomposites are two orders higher than that of the pure POMA-RNA hybrids. The PRAg31 system exhibits rectification property in the I-V characteristic curves and a probable explanation based on the feasibility of p-n junction formation arising from the transfer of lone pair of electrons of nitrogen of POMA (p-type) to the Ag nanoparticles (n-type) has been offered.
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Affiliation(s)
- Parimal Routh
- Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700 032, India
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Size-dependent electrocatalytic reduction of nitrite at nanostructured films of hollow polyaniline spheres and polyaniline–polystyrene core–shells. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.07.039] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Lee YJ, Lyoo WS. Preparation and characterization of high-molecular-weight atactic poly(vinyl alcohol)/sodium alginate/silver nanocomposite by electrospinning. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/polb.21784] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
The paper gives a review of publications on polymers with conjugated matrices (PPy, PTh, PAni, hydrocarbon or mixed chains...) which incorporate metallocene complexes (Fe, Ru, Co; Ni, Ti, Zr, Ta) with two cyclopentadienyl ligands (Cp) and their derivatives, in particular with methylated cyclopentadienyl rings (Cp*), as well as hemi-metallocene complexes (Fe, Ru, Co, Mn), as pendant groups or inside the principal chain (part B). The information on related short-chain systems, monomers and oligomers, is also included. In part A, a brief overview of various conjugated polymer materials is presented, with their classification in accordance with the conductivity mechanism (ionic, electronic or mixed conductors) or with the structural type (linear-chain organic or mixed polymers, derivatization, metallopolymers, multi-dimensional structures, alternating and block copolymers with organic or mixed units, hybrid materials with a mixture of conjugated and inert polymers, polymers inside a solid matrix, conjugated polymers with incorporated nanoelements of transition metals, carbon, semiconductors etc.
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Zhang YN, Chen M, Zhao Y, Liu Z, Liu X. Template Fabrication of Novel Structure of Polypyrrole Nanotubules Inner-embedded with Gold Nanoparticles. CHEM LETT 2007. [DOI: 10.1246/cl.2007.1286] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Prathap Chandran S, Ghatak J, Satyam PV, Sastry M. Interfacial deposition of Ag on Au seeds leading to AucoreAgshell in organic media. J Colloid Interface Sci 2007; 312:498-505. [PMID: 17434179 DOI: 10.1016/j.jcis.2007.03.032] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2006] [Revised: 02/05/2007] [Accepted: 03/17/2007] [Indexed: 11/27/2022]
Abstract
A seed mediated procedure for the synthesis of hydrophobic Au(core)Ag(shell) nanoparticles in toluene is demonstrated. The reaction proceeds by way of the interfacial reduction of silver ions by 3-pentadecylphenol followed by their deposition on hydrophobized Au nanoparticles. Such a hitherto unreported interfacial seeded growth reaction leads to the formation of phase pure Au(core)Ag(shell) nanoparticles that retain the hydrophobicity of the seed particles and remain stable in toluene. Such core-shell structures are however not formed in the aqueous phase. The core-shell architecture was verified using TEM analysis and the formation process was studied by recording the UV-vis spectra of the organic phase nanoparticles as a function of time. TEM kinetics also showed gradual increase in the silver layer thickness. Conclusive evidence was however obtained on examination of the HRTEM images of the products formed. Elemental analysis using X-ray photoelectron spectroscopy of the Au(core)Ag(shell) nanostructure revealed the presence of metallic silver. Moreover changing the surface capping of the Au seed does not affect the formation of the Au(core)Ag(shell) nanostructure.
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Affiliation(s)
- S Prathap Chandran
- Nanoscience Group, Materials Chemistry Division, National Chemical Laboratory, Pune 411 008, India
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Affiliation(s)
- Jennifer A Dahl
- Department of Chemistry and Materials Science Institute, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, USA
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Li J, Lin X. Glucose biosensor based on immobilization of glucose oxidase in poly(o-aminophenol) film on polypyrrole-Pt nanocomposite modified glassy carbon electrode. Biosens Bioelectron 2007; 22:2898-905. [PMID: 17215117 DOI: 10.1016/j.bios.2006.12.004] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2006] [Revised: 11/30/2006] [Accepted: 12/01/2006] [Indexed: 11/18/2022]
Abstract
Novel Pt nanoclusters embedded polypyrrole nanowires (PPy-Pt) composite was electrosynthesized on a glassy carbon electrode, denoted as PPy-Pt/GCE. A glucose biosensor was further fabricated based on immobilization of glucose oxidase (GOD) in an electropolymerized non-conducting poly(o-aminophenol) (POAP) film that was deposited on the PPy-Pt/GCE. The morphologies of the PPy nanowires and PPy-Pt nanocomposite were characterized by field emission scanning electron microscope (FE-SEM). Effect of experimental conditions involving the cycle numbers for POAP deposition and Pt nanoclusters deposition, applied potential used in glucose determination, temperature and pH value of the detection solution were investigated for optimization. The biosensor exhibited an excellent current response to glucose over a wide linear range from 1.5 x 10(-6) to 1.3 x 10(-2)M (r=0.9982) with a detection limit of 4.5 x 10(-7)M (s/n=3). Based on the combination of permselectivity of the POAP and the PPy films, the sensor had good anti-interference ability to ascorbic acid (AA), uric acid (UA) and acetaminophen. The apparent Michaelis-Menten constant (K(m)) and the maximum current density (I(m)) were estimated to be 23.9 mM and 378 microA/cm(2), respectively. In addition, the biosensor had also good sensitivity, stability and reproducibility.
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Affiliation(s)
- Jing Li
- Department of Chemistry, University of Science and Technology of China, # 96 Jinzhai Rd., Hefei, Anhui 230026, PR China
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Xie J, Lee JY, Wang DIC, Ting YP. Identification of active biomolecules in the high-yield synthesis of single-crystalline gold nanoplates in algal solutions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2007; 3:672-82. [PMID: 17299827 DOI: 10.1002/smll.200600612] [Citation(s) in RCA: 144] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
In this work, single-crystalline gold nanoplates were produced by treating an aqueous solution of chloroauric acid with the extract of the unicellular green alga Chlorella vulgaris at room temperature. The results suggest proteins as the primary biomolecules involved in providing the dual function of Au(III) reduction and the size- and shape-controlled synthesis of the nanogold crystals. A protein with a molecular weight of approximately 28 kDa was isolated and purified by reversed-phase HPLC; this protein tested positive for the reduction of chloroauric acid in aqueous solution. The isolated protein (named gold shape-directing protein, or GSP for convenience) was then used to produce gold nanoplates with distinctive triangular and hexagonal shapes in high yields (approximately 90 %). The kinetics of the reduction reaction could be manipulated through changes in the GSP concentration to produce plates with lateral sizes ranging from nanometers to micrometers. The growth of gold nanoplates in the GSP solution with time was monitored by microscopic and spectroscopic techniques, thereby allowing the detection of several key intermediates in the growth process.
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Affiliation(s)
- Jianping Xie
- Singapore-MIT Alliance, National University of Singapore, 4 Engineering Drive 3, Singapore 117576, Singapore
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Abstract
An optical sensing probe has been developed by taking advantage of the polypyrrole (PPy) chromophore. The absorbance of the oxidation product of pyrrole, i.e., solubilized PPy colloids, is shown to be directly proportional to the concentration of hydrogen peroxide, when H2O2 is used as an oxidant for pyrrole in the presence of a surfactant, sodium dodecyl sulfate, and Fe(II) in a slightly acidic aqueous solution. Based on this result, a new optical sensing method has been developed for the determination of H2O2. The probe has also been applied to optical sensing of ethanol by biocatalyzed generation of H2O2 in the presence of O2, ethanol, and alcohol oxidase. The novel methodology is expected to provide a general protocol for the determination of H2O2 as well as for numerous other oxidase-based reactions producing H2O2 as a product.
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Affiliation(s)
- Haiyan Wang
- Department of Chemistry and Center for Integrated Molecular Systems, Pohang University of Science and Technology, San 31, Hyoja-dong, Pohang, Gyeongbuk 790-784, Korea
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Bhattacharya S, Malik S, Nandi AK, Ghosh A. Transport properties of CdS nanowire embedded poly(3-hexyl thiophene) nanocomposite. J Chem Phys 2006; 125:174717. [PMID: 17100471 DOI: 10.1063/1.2370928] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Electrical transport properties of CdS nanowire embedded regioregular poly(3-hexyl thiophene) (P3HT) nanocomposite are investigated and the results are compared with those of the pure P3HT polymer. Both dc and ac conductivities of P3HT and CdS-P3HT nanocomposites show semiconducting nature and conductivity of CdS-P3HT is much less than that of the pure P3HT conducting polymer. The difference in the electrical behavior is attributed to the formation of nanowires in the CdS-P3HT nanocomposite. The dc conductivity data at high and low temperatures are qualitatively consistent with the optical-photon-assisted hopping and variable-range hopping models, respectively. However, the multiphonon-assisted hopping models of small polarons in nonadiabatic regime, which consider strong interactions with electrons with the optical as well as acoustical phonons, are the best to interpret quantitatively the experimental data in the entire temperature range for both P3HT and CdS-P3HT nanocomposites. We observe that the quantum tunneling model of small polarons is consistent with almost every respect of the loss data of P3HT conducting polymer, while for CdS-P3HT nanocomposite the ac conductivity varies with temperature in a different manner, which is explained in terms of simple quantum tunneling model of electrons in contrast to that of pure P3HT conducting polymer.
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Affiliation(s)
- S Bhattacharya
- Department of Solid State Physics, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Wang Y, Gan L, Chen H, Dong S, Wang J. Structure and Identity of 4,4‘-Thiobisbenzenethiol Self-Assembled Monolayers. J Phys Chem B 2006; 110:20418-25. [PMID: 17034226 DOI: 10.1021/jp062422m] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Self-assembled monolayers (SAMs) of 4,4'-thiobisbenzenethiol (TBBT) can be formed on Au surface spontaneously. The structural characteristics and adsorption behavior of TBBT SAMs on Au have been investigated by surface enhanced Raman scattering (SERS), electrochemical cyclic voltammetry (CV), ac impedance spectroscopy (EIS), and atomic force microscopy (AFM). It is demonstrated that TBBT adsorbed on Au by losing a H atom, forming one Au-S bond, and the other mercapto group is free at the surface of the monolayer owing to the presence of the nu(S-H) at 2513 cm(-1) and the delta(C-S-H) at 910 cm(-1) in SERS. The enhancement of the vibration of C-S (1064 cm(-1)), the aromatic C-H vibration (3044 cm(-1)), and the absence of the vibration of S-S illustrate TBBT adsorbed on Au forming a monolayer with one benzene ring tilted with respect to the Au surface. The interpretation of the observed frequencies is aided by ab initio molecular orbital (MO) calculations at the HF/6-31G level of theory. Electrochemical CV and EIS indicate TBBT monolayers can passivate the Au effectively for its low ratio of pinhole defects (theta = 99.6%). AFM studies give details about the surface morphology. The applications of TBBT SAMs have been extensively investigated by exposure of Cu2+ ion to TBBT SAMs on Au and covalent adsorption of metal nanoparticles. Electrochemical, X-ray photoelectron spectroscopic, and SERS results indicate that Cu2+ can react with TBBT SAMs and present on TBBT SAMs as Cu(I). A scanning electron microscopic image of Ag nanoparticles on TBBT/Au and the Raman spectrum of TBBT in smooth macroscopic Au/TBBT SAMs/Ag nanoparticle sandwich structure indicate that metal nanoparticles can be adsorbed on TBBT SAMs effectively through covalent linkage.
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Affiliation(s)
- Yuling Wang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, People's Republic of China
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Dawn A, Nandi AK. Formation of Silver Nanoparticles in Deoxyribonucleic Acid−Poly(o-methoxyaniline) Hybrid: A Novel Nano-biocomposite. J Phys Chem B 2006; 110:18291-8. [PMID: 16970449 DOI: 10.1021/jp063269z] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel nano-biocomposite of silver and poly(o-methoxy aniline) (POMA)/DNA hybrid has been prepared by adding DNA solution to an aqueous solution of POMA (emeraldine base, EB) and AgNO(3) mixture. The mixture was aged for 10 days and was freeze-dried to form the hybrid nanocomposite (weight fraction of DNA = 0.75). FESEM pictures show a fibrillar network morphology of the biomolecular hybrid with silver nanoparticles on its surface. The TEM picture also corroborates silver nanoparticle formation in the biomolecular hybrid, and the denser population of nanoparticles in the TEM micrograph as compared to that in the SEM micrograph indicates that the nanoparticles are present inside the fibrils in greater proportion. The dc conductivity value of the hybrid indicates that POMA (EB) is doped by silver ion and the doped POMA form complexes with DNA through electrostatic interaction of the radical cation of POMA (emeraldine salt form, ES) and the DNA anion. During the doping process and Ag nanoparticle formation, a fluctuation of the pi band to polaron band transition peak occurs together with a complementary fluctuation of the polaron band to pi* band transition peak. After 53 h of aging, the former shows a slow but continuous red shift with aging time. This has been attributed to the slow uncoiling of POMA on the DNA surface. The conformation and crystal structure of DNA remain intact during the nano-biocomposite formation. The dc conductivity value of the nano-biocomposite is almost the same as that of the pure POMA-DNA hybrid at the same composition, but the I-V characteristic curve of the nano-biocomposite is somewhat different showing an insulating region on low applied voltage. At higher applied voltage, it shows a semiconducting property characterizing the large band gap semiconducting behavior of the nano-biocomposite.
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Affiliation(s)
- Arnab Dawn
- Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India
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Li X, Wan M, Wei Y, Shen J, Chen Z. Electromagnetic Functionalized and Core−Shell Micro/Nanostructured Polypyrrole Composites. J Phys Chem B 2006; 110:14623-6. [PMID: 16869564 DOI: 10.1021/jp062339z] [Citation(s) in RCA: 87] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Core-shell micro/nanostructured and electromagnetic functionalized polypyrrole (PPy) composites were prepared by a self-assembly process associated with the template method in the presence of p-toluenesulfonate acid (p-TSA) as the dopant, in which the spherical hydroxyl iron (Fe[OH], 0.5-5 microm in diameter) functioned not only as the hard template, but also as the "core" of the micro/nanostructure, and the self-assembled PPy-p-TSA nanofibers (20-30 nm in diameter) acted as the "shell" (50-100 nm in thickness) of the microspheres. We found that the core-shell micro/nanostructures exhibit controllable electromagnetic properties by adjusting the mass ratio of Fe[OH] to pyrrole monomer. The micelle model was proposed to interpret the self-assembly of the core-shell micro/nanostructured composites.
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Affiliation(s)
- Xin Li
- Beijing National Laboratory for Molecular Sciences, Organic Solid Laboratory, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, People's Republic of China
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