期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 21, 期 7, 页码 1568-1573出版社
ELSEVIER
DOI: 10.1016/S1003-6326(11)60898-4
关键词
SnO2 nano particles; Pd-doping; hydrothermal synthesis; gas sensing property; X-ray photoelectron spectroscopy
资金
- National Natural Science Foundation of China [60806032, 20975107]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of Education Ministry, China [2009R10064]
- Qianjiang Talent Program [2009R10064]
- Ningbo Natural Science Foundation, China [2009A610058, 2009A610030]
- Ningbo University, China
SnO2 nano particles with various Pd-doping concentrations were prepared using a template-free hydrothermal method. The effects of Pd doping on the crystal structure, morphology, microstructure, thermal stability and surface chemistry of these nano particles were characterized by transmission electron microscope, X-ray diffractometer and X-ray photoelectron spectroscope respectively. It was observed that Pd-doping had little effect on the grain sizes of the obtained SnO2 nano particles during the hydrothermal route. During thermal annealing, Pd-doping could restrain the growth of grain sizes below 500 degrees C while the grain growth was promoted when the temperature increased to above 700 degrees C. XPS results revealed that Pd existed in three chemical states in the as-synthesized sample as Pd-0, Pd2+ and Pd4+, respectively. Pd4+ was the main state which was responsible for improving the gas-sensing property. The optimal Pd-doping concentration for better gas-sensing property and thermal stability was 2.0%-2.5% (mole fraction).
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