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Jiang B, Gu W, Jiang W, Lv M, Niu B, Wu X, Wang W, Wang H. Directly Imaging Dynamic Electronic Coupling during Electrochemical Oxidation of Single Silver Nanoparticles. Angew Chem Int Ed Engl 2022; 61:e202209964. [DOI: 10.1002/anie.202209964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Indexed: 11/09/2022]
Affiliation(s)
- Bo Jiang
- State Key Laboratory of Analytical Chemistry for Life Science Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
| | - Wenjie Gu
- Key Laboratory for Organic Electronics and Information Displays & Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials (IAM) Nanjing University of Posts and Telecommunications Nanjing Jiangsu 210023 China
| | - Wenxuan Jiang
- State Key Laboratory of Analytical Chemistry for Life Science Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
| | - Mengqi Lv
- State Key Laboratory of Analytical Chemistry for Life Science Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
| | - Ben Niu
- State Key Laboratory of Analytical Chemistry for Life Science Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
| | - Xue‐Jun Wu
- State Key Laboratory of Coordination Chemistry School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
| | - Wei Wang
- State Key Laboratory of Analytical Chemistry for Life Science Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
| | - Hui Wang
- State Key Laboratory of Analytical Chemistry for Life Science Chemistry and Biomedicine Innovation Center (ChemBIC) School of Chemistry and Chemical Engineering Nanjing University Nanjing Jiangsu 210023 China
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2
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Jiang B, Gu W, Jiang W, Lv M, Niu B, Wu XJ, Wang W, Wang H. Directly Imaging Dynamic Electronic Coupling during Electrochemical Oxidation of Single Silver Nanoparticles. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202209964] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Bo Jiang
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Wenjie Gu
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Wenxuan Jiang
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Mengqi Lv
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Ben Niu
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Xue-Jun Wu
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Wei Wang
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Hui Wang
- Nanjing University Nanjing Xianlin road No. 163 CHINA
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3
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Zhang Y, Li D, Compton RG. Arsenic (III) Detection with Underpotential Deposition and Anodic Stripping Voltammetry. ChemElectroChem 2021. [DOI: 10.1002/celc.202101022] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Yifei Zhang
- Department of Chemistry Physical and Theoretical Chemistry Laboratory Oxford University South Parks Road Oxford OX1 3QZ UK
| | - Danlei Li
- Department of Chemistry Physical and Theoretical Chemistry Laboratory Oxford University South Parks Road Oxford OX1 3QZ UK
| | - Richard G. Compton
- Department of Chemistry Physical and Theoretical Chemistry Laboratory Oxford University South Parks Road Oxford OX1 3QZ UK
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4
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Chen M, Lu SM, Peng YY, Ding Z, Long YT. Tracking the Electrocatalytic Activity of a Single Palladium Nanoparticle for the Hydrogen Evolution Reaction. Chemistry 2021; 27:11799-11803. [PMID: 34101910 DOI: 10.1002/chem.202101263] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Indexed: 01/07/2023]
Abstract
The nanoparticle-based electrocatalysts' performance is directly related to their working conditions. In general, a number of nanoparticles are uncontrollably fixed on a millimetre-sized electrode for electrochemical measurements. However, it is hard to reveal the maximum electrocatalytic activity owing to the aggregation and detachment of nanoparticles on the electrode surface. To solve this problem, here, we take the hydrogen evolution reaction (HER) catalyzed by palladium nanoparticles (Pd NPs) as a model system to track the electrocatalytic activity of single Pd NPs by stochastic collision electrochemistry and ensemble electrochemistry, respectively. Compared with the nanoparticle fixed working condition, Pd NPs in the nanoparticle diffused working condition results in a 2-5 orders magnitude enhancement of electrocatalytic activity for HER at various bias potential. Stochastic collision electrochemistry with high temporal resolution gives further insights into the accurate study of NPs' electrocatalytic performance, enabling to dramatically enhance electrocatalytic efficiency.
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Affiliation(s)
- Mengjie Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Si-Min Lu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Yue-Yi Peng
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
| | - Zhifeng Ding
- Department of Chemistry, The University of Western Ontario, 1151 Richmond Street, London, ON N6A 5B7, Canada
| | - Yi-Tao Long
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, P. R. China
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5
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Masa J, Andronescu C, Schuhmann W. Electrocatalysis as the Nexus for Sustainable Renewable Energy: The Gordian Knot of Activity, Stability, and Selectivity. Angew Chem Int Ed Engl 2020; 59:15298-15312. [PMID: 32608122 PMCID: PMC7496542 DOI: 10.1002/anie.202007672] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Indexed: 01/11/2023]
Abstract
The use of renewable energy by means of electrochemical techniques by converting H2 O, CO2 and N2 into chemical energy sources and raw materials, is the basis for securing a future sustainable "green" energy supply. Some weaknesses and inconsistencies in the practice of determining the electrocatalytic performance, which prevents a rational bottom-up catalyst design, are discussed. Large discrepancies in material properties as well as in electrocatalytic activity and stability become obvious when materials are tested under the conditions of their intended use as opposed to the usual laboratory conditions. They advocate for uniform activity/stability correlations under application-relevant conditions, and the need for a clear representation of electrocatalytic performance by contextualization in terms of functional investigation or progress towards application is emphasized.
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Affiliation(s)
- Justus Masa
- Max Planck Institute for Chemical Energy ConversionStiftstrasse 34–3645470Mülheim an der RuhrGermany
| | - Corina Andronescu
- Faculty of ChemistryTechnical Chemistry IIIUniversity of Duisburg-EssenCarl-Benz-Str. 201, ZBT 24147057DuisburgGermany
| | - Wolfgang Schuhmann
- Analytical Chemistry—Center for Electrochemical Sciences (CES)Faculty of Chemistry and BiochemistryRuhr University BochumUniversitätstr. 15044780BochumGermany
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Masa J, Andronescu C, Schuhmann W. Elektrokatalyse als Nexus für nachhaltige erneuerbare Energien – der gordische Knoten aus Aktivität, Stabilität und Selektivität. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007672] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Justus Masa
- Max Planck Institut für Chemische Energiekonversion Stiftstraße 34–36 45470 Mülheim an der Ruhr Deutschland
| | - Corina Andronescu
- Fakultät für Chemie Technische Chemie III Universität Duisburg-Essen Carl-Benz-Straße 201, ZBT 241 47057 Duisburg Deutschland
| | - Wolfgang Schuhmann
- Analytische Chemie – Zentrum für Elektrochemie (CES) Fakultät für Chemie und Biochemie Ruhr-Universität Bochum Universitätstraße 150 44780 Bochum Deutschland
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7
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Pang J, Liu HL, Li J, Zhai TT, Wang K, Xia XH. Structural Change of a Single Ag Nanoparticle Observed by Dark-field Microspectroscopy. Chemphyschem 2018; 19:954-958. [PMID: 29383796 DOI: 10.1002/cphc.201701148] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2017] [Revised: 01/30/2018] [Indexed: 12/14/2022]
Abstract
Silver nanoparticles (AgNPs) have been widely used as photocatalysts and nanosensors. Observation of the spectroscopy of a single AgNP greatly helps us understand the catalytic characteristics and morphology change of the AgNP during reactions. In the present study, AgNPs physically adsorbed on indium tin oxide (ITO) conductive glass were electrochemically reduced and oxidized, and the plasmonic resonance Rayleigh scattering (PRRS) spectrum of an individual AgNP was observed under a dark-field microscopy (DFM) equipped with a spectrometer. The electrochemical oxidization of the AgNP under constant potential caused a redshift of the PRRS peak for 30±5 nm. However, electrochemical reduction of the AgNP could not make the PRRS peak completely shift back to the initial position. In situ AFM and SEM characterization confirmed that very small Ag fragments (<10 nm) formed around the AgNP core during electrochemical oxidization. Results showed that dark-field microspectroscopy could be used as a sensitive tool for estimating the morphology/structural changes of nanoparticles that can hardly be observed through the cyclic voltammograms of multiple AgNPs.
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Affiliation(s)
- Jie Pang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Hai-Ling Liu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Jian Li
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Ting-Ting Zhai
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Kang Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing, 210023, China
| | - Xing-Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing, 210023, China
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8
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Yang H, Li X, Batchelor-McAuley C, Sokolov SV, Kätelhön E, Compton RG. Immobilised Electrocatalysts: Nafion Particles Doped with Ruthenium(II) Tris(2,2'-bipyridyl). Chemistry 2017; 23:17605-17611. [PMID: 29034523 DOI: 10.1002/chem.201704418] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2017] [Indexed: 12/18/2022]
Abstract
Nafion particles doped with ruthenium(II) tris(2,2'-bipyridyl) are synthesized by using a re-precipitation method. Characterization including SEM sizing and quantification of Ru(bpy)32+ in the Nafion particles using UV/Vis spectroscopy was conducted. The synthesized Ru-Nafion particles were investigated electrochemically at both ensemble and single particle levels. Voltammetry of the drop-cast Ru-Nafion particles evidences the successful incorporation of Ru(bpy)32+ into the Nafion particle but only a small fraction of the incorporated Ru(bpy)32+ was detected due at least in part to the formation of the likely agglomerated and irregular "mat" associated with the dropcast technique. In contrast, nano-impact experiments provided a quantitative determination of the amount of Ru(bpy)32+ in single Ru-Nafion particles. Finally, oxidation of solution-phase oxalate mediated by Ru(bpy)32+ within individual Nafion particles was observed, showing the electrocatalytic properties of the Ru-Nafion particles.
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Affiliation(s)
- Haiying Yang
- Department of Chemistry, Yuncheng University, Yuncheng, 044000, P.R. China.,Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK
| | - Xiuting Li
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK
| | | | - Stanislav V Sokolov
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK
| | - Enno Kätelhön
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK
| | - Richard G Compton
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, Oxford University, Oxford, OX1 3QZ, UK
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9
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Liu J, Li X, Batchelor-McAuley C, Zhu G, Compton RG. Nitrite-Enhanced Charge Transfer to and from Single Polyaniline Nanotubes. Chemistry 2017; 23:17823-17828. [PMID: 29068104 DOI: 10.1002/chem.201704055] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Indexed: 11/12/2022]
Abstract
As Liu et al. reported previously (Appl. Mater. Today 2017, 7, 239-245), the charge transfer to partially oxidized polyaniline (PANI) nanotubes in electrochemical reactions is heavily limited due to the non-conductivity of the reduction/oxidation products. In this paper, the doping level of individual PANI nanotubes was substantially enhanced using nitrite as an electron acceptor in sulfuric acid aqueous solution as recorded by the nano-impact method. The charge transferred to one single tube during reduction process is close to the theoretical value of 170±112 pC per tube (assuming 2-electron reduction for the PANI tubes studied), while the charge during PANI oxidation is dramatically decreased. Reaction processes are proposed based on the oxidative properties of nitrite in acid solution. UV-visible spectroscopy analysis further confirms an oxidation-reduction reaction between PANI and nitrite. In contrast the electrochemical reaction of ensembles (21 μg cm-1 ) of PANI tubes on glassy carbon electrodes simply show limited electrocatalytic activity.
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Affiliation(s)
- Jianyun Liu
- State Environmental Protection Engineering Center for Pollution Treatment and Control in the Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.,Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, UK
| | - Xiuting Li
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, UK
| | | | - Guodong Zhu
- State Environmental Protection Engineering Center for Pollution Treatment and Control in the Textile Industry, College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China
| | - Richard G Compton
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford, OX1 3QZ, UK
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10
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Ngamchuea K, Clark ROD, Sokolov SV, Young NP, Batchelor-McAuley C, Compton RG. Single Oxidative Collision Events of Silver Nanoparticles: Understanding the Rate-Determining Chemistry. Chemistry 2017; 23:16085-16096. [PMID: 28922508 DOI: 10.1002/chem.201703591] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2017] [Indexed: 01/13/2023]
Abstract
The oxidative dissolution of citrate-capped silver nanoparticles (AgNPs, ∼50 nm diameter) is investigated herein by two electrochemical techniques: nano-impacts and anodic stripping voltammetry. Nano-impacts or single nanoparticle-electrode collisions allow the detection of individual nanoparticles. The technique offers an advantage over surface-immobilized methods such as anodic stripping voltammetry as it eliminates the effects of particle agglomeration/aggregation. The electrochemical studies are performed in different electrolytes (KNO3 , KCl, KBr and KI) at varied concentrations (≤20 mm). In nano-impact measurements, the AgNP undergoes complete oxidation upon impact at a suitably potentiostated electrode. The frequency of the nanoparticle-electrode collisions observed as current-transient spikes depends on the electrolyte identity, its concentration and the potential applied at the working electrode. The frequencies of the spikes are significantly higher in the presence of halide ions and increase with increasing potentials. From the frequency, the rate of AgNP oxidation as compared with the timescale the AgNP is in electrical contact with the electrode can be inferred, and hence is indicative of the relative kinetics of the oxidation process. Primarily based on these results, we propose the initial formation of the silver (I) nucleus (Ag+ , AgCl, AgBr or AgI) as the rate-determining process of silver oxidation on the nanoparticle.
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Affiliation(s)
- Kamonwad Ngamchuea
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Richard O D Clark
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Stanislav V Sokolov
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Neil P Young
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Christopher Batchelor-McAuley
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Richard G Compton
- Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
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Krause KJ, Brings F, Schnitker J, Kätelhön E, Rinklin P, Mayer D, Compton RG, Lemay SG, Offenhäusser A, Wolfrum B. The Influence of Supporting Ions on the Electrochemical Detection of Individual Silver Nanoparticles: Understanding the Shape and Frequency of Current Transients in Nano-impacts. Chemistry 2017; 23:4638-4643. [DOI: 10.1002/chem.201605924] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Indexed: 01/01/2023]
Affiliation(s)
- Kay J. Krause
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Fabian Brings
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Jan Schnitker
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Enno Kätelhön
- Department of Chemistry; Physical and Theoretical Chemistry Laboratory; Oxford University, South Parks Road; Oxford OX1 3QZ UK
| | - Philipp Rinklin
- Neuroelectronics, MSB, Department of Electrical and Computer Engineering; Technical University of Munich (TUM); Boltzmannstr. 11 85748 Garching Germany
- Bernstein Center for Computational Neuroscience Munich; Germany
| | - Dirk Mayer
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Richard G. Compton
- Department of Chemistry; Physical and Theoretical Chemistry Laboratory; Oxford University, South Parks Road; Oxford OX1 3QZ UK
| | - Serge G. Lemay
- MESA+ Institute for Nanotechnology; University of Twente, PO Box 217; 7500 AE Enschede The Netherlands
| | - Andreas Offenhäusser
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
| | - Bernhard Wolfrum
- Institute of Bioelectronics (PGI-8/ICS-8) and JARA-Fundamentals of Future Information Technology; Forschungszentrum Jülich; 52425 Jülich Germany
- Neuroelectronics, MSB, Department of Electrical and Computer Engineering; Technical University of Munich (TUM); Boltzmannstr. 11 85748 Garching Germany
- Bernstein Center for Computational Neuroscience Munich; Germany
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13
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Plowman BJ, Young NP, Batchelor-McAuley C, Compton RG. Nanorod Aspect Ratios Determined by the Nano-Impact Technique. Angew Chem Int Ed Engl 2016; 55:7002-5. [DOI: 10.1002/anie.201602867] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Indexed: 12/26/2022]
Affiliation(s)
- Blake J. Plowman
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
| | - Neil P. Young
- Department of Materials; University of Oxford; Parks Road Oxford OX1 3PH UK
| | | | - Richard G. Compton
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
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14
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Plowman BJ, Young NP, Batchelor-McAuley C, Compton RG. Nanorod Aspect Ratios Determined by the Nano-Impact Technique. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602867] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Blake J. Plowman
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
| | - Neil P. Young
- Department of Materials; University of Oxford; Parks Road Oxford OX1 3PH UK
| | | | - Richard G. Compton
- Department of Chemistry; PTCL; University of Oxford; South Parks Road Oxford OX1 3QZ UK
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