Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (12): 2405-2412.doi: 10.3866/PKU.WHXB201510261

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Preparation of Y-Doped ZnO Nanofibers and Sensing Mechanism of the Gas Sensors

Qiu-Xia. FENG1,2,Peng. YU1,Jing. WANG1,*(),Xiao-Gan. LI1,*()   

  1. 1 School of Electronic Science and Technology, Dalian University of Technology, Dalian 116023, Liaoning Province, P. R. China
    2 Department of Electronic Engineering, Dalian Neusoft University of Information, Dalian 116023, Liaoning Province, P. R. China
  • Received:2015-09-09 Published:2015-12-04
  • Contact: Jing. WANG,Xiao-Gan. LI E-mail:wangjing@dlut.edu.cn;lixg@dlut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(61474012, 61176068, 61574025, 61131004)

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Abstract:

Y-doped ZnO nanofibers were synthesized by an electrospinning method. The structure and morphology of the samples were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), transmission electron microscopy (TEM), and thermogravimetric/differential thermal analysis (TG-DTA). The sensitivity of the pure and Y-doped ZnO nanofibers towards acetone from 1×10-6 to 200×10-6 (volume fraction) was investigated. Fine tuning of the sensing ability of the ZnO nanofibres was possible by controlling the amount of Y loaded in the nanofibers. The ZnO nanofibers doped with Y exhibited very high responses towards acetone. Both the pure and Y-doped ZnO sensors showed selectivity towards several potential interferent gases, including ammonia, benzene, formaldehyde, toluene, and methanol. The sensing mechanism is discussed.

Key words: Gas sensor, ZnO nanofiber, Y dopant, Electrospinning, Acetone