科研之友
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摘要
In this article, we describe how Ho3+-doped WO3 nanoparticles have been synthesised by solgel treatment from the precursors of W, H2O2, Ho2O3 and HNO3 at room temperature, followed by calcinations at 500 degrees C for 1 h. The samples were characterised by X-ray diffraction, scanning electronic microscopy and X-ray photoelectron spectroscopy. Obtained results indicated that the as-synthesised particle diameter is 60 nm under different Ho2O3-doped concentrations. In comparison with pure WO3 sensor, all of the Ho3+-doped sensors showed better sensing performance in respect o(f) sensitivity, selectivity and optimum operating temperature. The effects of Ho2O3 content, acetone vapour concentration and operating temperature on the sensing characteristics of the Ho3+-doped WO3 sensors were also investigated. The sensor containing 3.0 mol% Ho2O3 exhibited the maximum sensitivity to acetone vapour at 200 degrees C. A possible mechanism for the influence of Ho2O3 on the acetone-sensing properties of Ho2O3-doped WO3 sensors was proposed.
- 出版日期2013-2-1
- 单位许昌学院
