Carbon nanotubes-functionalized urchin-like In2S3 nanostructure for sensitive and selective electrochemical sensing of dopamine

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• 作者：Zhanjun Yang (1) zjyang@yzu.edu.cn
  Xiaochun Huang (1)
  Juan Li (1)
  Yongcai Zhang (1)
  Suhua Yu (1)
  Qin Xu (1)
  Xiaoya Hu (1) xyhu@yzu.edu.cn
• 关键词：Urchin ; like In2S3 – ; Nanostructure – ; Carbon nanotubes – ; Dopamine – ; Electrochemical detection
• 刊名：Microchimica Acta
• 出版年：2012
• 出版时间：June 2012
• 年：2012
• 卷：177
• 期：3-4
• 页码：381-387
• 全文大小：410.6 KB
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• 作者单位：1. College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 People鈥檚 Republic of China
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073

文摘

Urchin-like In₂S₃ nanostructures were functionalized with multi-walled carbon nanotubes (MWCNTs) and deposited on a glassy carbon electrode (GCE) to obtain a new kind of sensor for dopamine (DA). The new electrode was characterized using scanning electron microscopy, energy dispersive X-ray spectroscopy, cyclic voltammetry and differential pulse voltammetry. It is found that the current response toward DA is significantly enhanced compared to that of a bare GCE or a GCE modified with MWCNTs. The peak separation between DA and ascorbic acid (AA) is up to 225 mV. The new electrode also has improved selectivity for DA over AA compared to the bare electrode. The new DA sensor has a wide linear range (0.5–300 μM), high sensitivity (594.9 μA mM−1 cm−2) and low detection limit (0.1 μM). CNTs wrapped on urchin-like nanostructures remarkable improve its electrocatalytic activity and thus provide a promising strategy to develop excellent composite materials for electrochemical sensing.