Seed Mediated Growth of Gold Nanoparticles on Indium Tin Oxide Electrodes: Electrochemical Characterization and Evaluation
Seed Mediated Growth of Gold Nanoparticles on Indium Tin Oxide Electrodes: Electrochemical Characterization and Evaluation
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DOI：
10.1002/elan.200403174
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发表时间：
2005-03
期刊：
影响因子：
3
通讯作者：
Jingdong Zhang;Miyako Kambayashi;M. Oyama
中科院分区：
文献类型：
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作者：
Jingdong Zhang;Miyako Kambayashi;M. Oyama
描述了金纳米粒子在氧化铟锡 (ITO) 表面上的种子介导生长，这为构建金纳米粒子修饰的 ITO 电极提供了一种新方法，即使不使用传统的连接分子，如 (3-巯基丙基)三甲氧基硅烷 (MPTMS)。在此过程中，首先形成超小的金种子并将其固定在 ITO 表面上。当沉积种子的 ITO 表面与金生长溶液接触时，金纳米颗粒就会生长。发现所制备的改性表面的形态强烈依赖于基材。在 MPTMS 硅烷化的 ITO 上，大部分形成金纳米球 (Au/MPTMS/ITO)。相比之下，在裸露的 ITO 上，生长并直接附着一些高纵横比的金纳米棒以及大量的金纳米球 (Au/ITO)。由于 MPTMS 分子的影响，所制备的两种金纳米粒子修饰的 ITO 电极表现出不同的电化学特性。与Au/MPTMS/ITO相比，Au/ITO能够更有效地降低[Fe(CN)6]3−/[Fe(CN)6]4−的异质电荷转移电阻并提高反应可逆性，并表现出更有吸引力的生物电催化性能。由于硫醇单层的阻断效应，Au/MPTMS/ITO 降低了抗坏血酸（AA）存在下测定肾上腺素（EP）的选择性，而 Au/ITO 可以提高检测灵敏度并保持选择性。
The seed mediated growth of gold nanoparticles on indium tin oxide (ITO) surfaces is described, which provided a new method for the construction of gold nanoparticles-modified ITO electrodes even without using conventional linker molecules, such as (3-mercaptopropyl)trimethoxysilane (MPTMS). In this process, ultra-small gold seeds were formed and anchored on the ITO surfaces first. When the seeds-deposited ITO surfaces came into contact with the gold growth solution, the growth of gold nanoparticles occurred. The morphology of the as-prepared modified surface was found to be strongly dependent upon the substrate. On an MPTMS-silanized ITO, mostly gold nanospheres were formed (Au/MPTMS/ITO).In contrast, on a bare ITO, some high aspect ratio gold nanorods as well as large amounts of gold nanospheres were grown and directly attached (Au/ITO). The as-prepared two gold nanoparticles-modified ITO electrodes exhibited different electrochemical characteristics, attributed to the influence of MPTMS molecules. Compared with Au/MPTMS/ITO, the Au/ITO was more efficient in decreasing the heterogeneous charge transfer resistance and improving the reaction reversibility of [Fe(CN)6]3−/[Fe(CN)6]4− and exhibited more attractive bioelectrocatalytic properties. Due to the block effect of the thiol monolayer, Au/MPTMS/ITO depressed the selectivity for the determination of epinephrine (EP) in the presence of ascorbic acid (AA) while Au/ITO could improve the detection sensitivity and retain the selectivity.