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The Process of Cysteine Self-assembly on Gold Nanoparticle Modified Electrodes and Their Application

Author: HuYanLing
Tutor: DiJunWei
School: Suzhou University
Course: Analytical Chemistry
Keywords: Self-assembly process Cysteine Gold nanoparticles Au-Pt alloy nanoparticles Ascorbic acid
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 73
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Abstract


Thiol, thioether or disulfide derivatives of S atoms in strong interaction with the Au surface, the gold surface to form self-assembled monolayers (Self-assembled Monolayers, referred SAMs), SAMs have good stability, dense nature, order of certain molecules or ions having a high selective identification function, the surface characteristics of the metal electrode to provide a fast, flexible and simple system. Cysteine ​​(cys) are the only amino acid containing a thiol group, in the preparation of chemically modified electrodes and the biosensor molecules of cysteine ​​reagent commonly used in the self-assembly. Although the cysteine ​​on the metal surface of the self-assembly mechanism of a lot of research reports, but the mechanism is not fully understood, such as cysteine ​​Self-assembled on the Au film is formed on the surface after the electrochemical behavior appeared contradictions, in-0.3v - 0.4v potential range, some literature reports that no redox peaks, some literature reports that there are peaks. In this thesis, using electrochemical deposition method indium tin oxide (ITO) deposited on a transparent conductive glass gold nanoparticles, and then use the strong thiol affinity for gold on the gold electrode on the role of self-assembled cysteine, systematic study of the semi- cystine on Au nanoparticles self-assembly process, but also discusses the formation of this redox mechanism. Experimental results show that the Au nano surface cysteine ​​self-assembly process, under certain conditions (such as higher temperature and longer soak time), it may be formed of Au (OH) x, and with the active gold (Au *) to form a redox couple, manifested in cyclic voltammetry appears on one pair of distinct redox peaks reported in the literature can be well explained different cysteine ​​Modified Gold Electrodes. In addition, the modified electrode also catalyzed hydrogen peroxide has good electrical properties. This paper studies cysteine ​​Self-assembled nano-Au and Au-Pt alloy nanoparticles modified electrode modified electrode was investigated catalytic performance compared ascorbic acid (AA) in the Cys / AuNPs / ITO, Cys / AuOH-AuNPs / ITO and Cys / Au-PtNPs / ITO Electrode catalytic performance. Experimental results show that cysteine ​​modified gold platinum alloy electrode incorporates cysteine ​​Self-assembled nano-Au-Pt alloy film and the synergy of the AA has the best electrocatalytic response to the oxidation peak current for AA at 4.0 × 10 -6 -3.6 × 10 -4 mol / L concentration range of linear detection limit of 5.8 × 10 -7 mol / L. Used for the determination of the actual samples with satisfactory results.

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