Acta Phys. -Chim. Sin. ›› 2015, Vol. 31 ›› Issue (10): 1997-2004.doi: 10.3866/PKU.WHXB201508241

• PHYSICAL CHEMISTRY OF MATERIALS • Previous Articles     Next Articles

Preparation and Gas Sensing Properties of PdO, Au, CdO Coatings on SnO2 Nanofibers

Rui-Jin. HU,Jing. WANG*(),Hui-Chao. ZHU   

  • Received:2015-05-25 Published:2015-10-10
  • Contact: Jing. WANG E-mail:wangjing@dlut.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(61176068, 61131004, 61107028)

Abstract:

SnO2 nanofibers fabricated by electrospinning were coated with PdO, Au, and CdO. X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectrometry (EDX), X-ray photoelectron spectroscopy (XPS), and Brunauer-Emmett-Teller (BET) tests were used to characterize the nanofibers. The diameters of bare and coated SnO2 nanofibers were approximately 200 nm, and had 15-nm diameter grains. The gas-sensing properties of all the nanofibers were characterized under static gas conditions. The results indicated that the bare SnO2 nanofibers were sensitive to formaldehyde; however the sensitivity of the coated nanofibers was better. In particular, the CdO-coated SnO2 exhibited the highest sensitivity to formaldehyde, the shortest response and recovery times, and good selectivity. The operating temperature of the Au-coated SnO2 decreased from 300 to 200 ℃, while the PdO-coated SnO2 exhibited the highest sensitivity to toluene. The sensing mechanism of the coated SnO2 nanofibers was investigated.

Key words: Gas sensor, SnO2, Coating, Electrospinning, Gas sensing mechanism

MSC2000: 

  • O649