J. Mater. Sci. Technol. ›› 2013, Vol. 29 ›› Issue (5): 401-405.DOI: 10.1016/j.jmst.2013.03.021

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Thin Film Assembly of Gold Nanoparticles for Vapor Sensing via Droplet Interfacial Reaction

Kun Luo1), Tao Huang1), Yujia Luo2), Haiming Wang1), Chao Sang1), Xiaogang Li1)   

  1. 1) Key Laboratory of New Processing Technology for Nonferrous Metals & Materials, Ministry of Education, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
    2) China Medical University, Shenbei New District, Shenyang 111013, China
  • Received:2013-02-05 Revised:2013-02-26 Online:2013-05-30 Published:2013-05-17
  • Contact: K. Luo
  • Supported by:

    National Natural Science Foundation of China (Grant No. 21163004), the Guangxi Natural Science Foundation (Grant No. 2010GXNSFC013006) and the Scientific Research Foundation for Returned Scholars, Ministry of Education of China.

Abstract:

A facile approach to prepare a thin film vapor sensor is demonstrated through droplet interfacial reaction on an IDA microelectrode. Scanning electron microscopy, atomic force microscopy and transmission electron microscopy analyses show that the film of the vapor sensor is composed of self-assembled gold nanocrystals in an average diameter of about 4.3 nm. The as-prepared sensor was examined by potential step method and impedance measurement, which exhibited significant ΔR/Ri responses and excellent cycle performance to the volatile organic compound (VOC) vapors of acetone, methanol, styrene, benzene, toluene and ethanol. The selectivity to the VOCs with benzene ring or organic solvents suggests that the sensor is probably in line with the swelling and dielectric sensing mechanisms.

Key words: Gold nanoparticle , Thin film , Self-assembly , Droplet interfacial reaction , Vapor sensor