Chem. J. Chinese Universities ›› 2020, Vol. 41 ›› Issue (12): 2804.doi: 10.7503/cjcu20200336

• Physical Chemistry • Previous Articles     Next Articles

Preparation of InN-In2O3 Nanocomposite with Bottle-shaped Structure and Its Enhanced Formaldehyde Gas Sensitivity

NING Qiuyang1, FENG Wei2, WU Guoguang1()   

  1. 1.State Key Joint Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,Jilin University,Changchun 130012,China
    2.The Third Hospital of Jilin University,Changchun 130033,China
  • Received:2020-06-08 Online:2020-12-10 Published:2020-12-09
  • Contact: WU Guoguang E-mail:wugg@jlu.edu.cn
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(11304112);the Science and Technology Development Program of Jilin Province, China(20170101086JC)

Abstract:

The In2O3 nano-powder was prepared by sol-gel method, and by reacting with NH3, the interme- diate product InN base material was obtained, then the InN-In2O3 nanocomposite was obtained through the in?situ oxidation process, and characterized by means of XRD(X-ray differaction), SEM(scanning electron microscopy), TEM(transmission electron microscopy) and XPS(X-ray photoelectron spectroscopy). The bottle-shaped nanocomposite was then equipped with a micro-chip sensor chip working platform. The results show that at a lower operating temperature(75 ℃), the detection limit for formaldehyde gas can be as low as ppb(0.13 mg/m3 or 100 ppb), with higher sensitivity(12), shorter response time(2 s), selectivity and stability. In the test of the influence of humidity on the sensitivity of the sensor, due to the water-soluble characteristics of formaldehyde, the sensitivity of the sensor changes with the change of humidity. This change is great when the concentration of formaldehyde is low, but small when the concentration of formaldehyde is high.

Key words: InN-In2O3, Sensor, Composite material, Formaldehyde

CLC Number: 

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