J. Mater. Sci. Technol. ›› 2011, Vol. 27 ›› Issue (7): 594-600.

• Nanomaterials and Nanotechnology • 上一篇    下一篇

Role of ZnO-CeO2 nanostructures as a photocatalyst and chemi-sensor

Sher Bahadar Khan   

  1. Najran University
  • 收稿日期:2010-12-01 修回日期:2011-03-03 出版日期:2011-07-28 发布日期:2011-07-26
  • 通讯作者: Sher Bahadar Khan
  • 基金资助:

    Thailand Graduate Institute of Science and Technology

Role of ZnO-CeO2 Nanostructures as a Photo-catalyst and Chemi-sensor

M. Faisal1), Sher Bahadar Khan1), Mohammed M. Rahman1), Aslam Jamal1), Kalsoom Akhtar2),  M.M. Abdullah1)   

  1. 1) Centre for Advanced Materials and Nano-Engineering (CAMNE) and Department of Chemistry, Faculty of Sciences and Arts, Najran University, Najran 11001, Kingdom of Saudi Arabia
    2) Division of Nano Sciences and Department of Chemistry, Ewha Womans University, Seoul 120-750, Korea
  • Received:2010-12-01 Revised:2011-03-03 Online:2011-07-28 Published:2011-07-26
  • Contact: S.B. Khan

RichHTML

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摘要： ZnO-CeO2 nanostructures were synthesized by simple and efficient low temperature method. The structure and morphology of the ZnO-CeO2 nanostructures were characterized by X-ray powder diffraction (XRD) and florescence emission scanning electron microscopy (FESEM) which revealed elongated shaped CeO2 nanoparticles with diameters of 40 ~ 90 nm distributed on the surface of elongated ZnO nanostructures with diameters of 50 ~ 200 nm (edge ~ centre). Further the structure of the synthesized ZnO-CeO2 nanostructure was supported by Raman spectra and fourier transform infrared spectroscopy (FTIR) while the composition was obtained by using EDS spectroscopy. UV-Vis absorption spectrum was used to confirm the optical properties of the CeO2 doped ZnO nanostructures. Photocatalytic activity of CeO2 doped ZnO nanostructures was evaluated by degradation of acridine orange and methylene blue which degraded 84.55 % of acridine orange and 48.65 % of methylene blue in 170 min. ZnO-CeO2 nanostructures also showed good sensitivity (0.833 μAcm-2M-1) in short response time (10 sec) by applying to chemical sensing using ethanol as a target compound by I-V technique. These degradation and chemical sensing properties of ZnO-CeO2 nanostructures are of great importance for the application of ZnO-CeO2 system as a photocatalyst and chemical sensor.

Abstract: ZnO-CeO2 nanostructures were synthesized by simple and efficient low temperature method. The structure and morphology of the ZnO-CeO2  nanostructures were characterized by X-ray powder diffraction (XRD) and field emission scanning electron microscopy (FESEM), which revealed elongated shaped CeO2 nanoparticles with diameters of 40-90 nm distributed on the surface of elongated ZnO nanostructures with diameters of 50-200 nm (edge{centre). Further the structure of the synthesized ZnO-CeO2 nanostructure was supported by Raman spectra and Fourier transform infrared spectroscopy (FTIR). UV-vis absorption spectrum was used to confirm the optical properties of the CeO2 doped ZnO nanostructures. Photo-catalytic activity of CeO2
doped ZnO nanostructure was evaluated by degradation of acridine orange and methylene blue which degraded 84.55% and 48.65% in 170 min, respectively. ZnO-CeO2 nanostructures also showed good sensitivity (0.8331 μA·cm-2(mol/l)-1) in short response time (10 s) by applying to chemical sensing using ethanol as a target compound by I-V technique. These degradation and chemical sensing properties of ZnO-CeO2 nanostructures are of great importance for the application of ZnO-CeO2 system as a photo-catalyst and chemical sensor.

Key words: ZnO-CeO2 nanostructures, Structural properties, Optical properties, Photocatalytic activity, Ethanol sensing