Grain size control of calcined SnO2 nanocrystals: Raman study and room temperature ethanol sensing properties.
Grain size control of calcined SnO2 nanocrystals: Raman study and room temperature ethanol sensing properties.
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DOI：
10.1166/jnn.2011.3719
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发表时间：
2011-04
影响因子：
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通讯作者：
Yu Wang;Lin Dong;X. Jia;Deliang Chen;S. Guan
中科院分区：
文献类型：
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作者：
Yu Wang;Lin Dong;X. Jia;Deliang Chen;S. Guan
采用溶胶-凝胶法将水合SnO2纳米颗粒和SiO_2纳米球在600℃下加热，制得平均粒径为3.3 nm的SnO2纳米颗粒，小于600℃焙烧得到的SnO2纳米颗粒(6.4 nm)，并用拉曼光谱分析了SiO_2对SnO2纳米颗粒生长的限制作用。在SnO2/SiO_2复合材料中观察到A1G和B2G拉曼模式的蓝移，认为这是一种压应力效应。在室温下，尺寸约为3.3 nm的SnO2纳米颗粒表现出增强的乙醇响应，其恢复时间远短于尺寸约为6.4 nm的SnO2纳米晶。
SnO2 nanoparticles were prepared via a sol-gel method by heating the mixture of hydrous SnO2 nanoparticles and SiO2 nanospheres at 600 degrees C. The average particle size of the obtained SnO2 nanoparticles is 3.3 nm, smaller than that of the SnO2 nanoparticles ( 6.4 nm) prepared by calcining the pure hydrous SnO2 at 600 degrees C. The restricting effect of SiO2 on the growth of SnO2 nanoparticles was discussed by Raman spectra. A blue shift of A1g ) and B2g Raman modes in SnO2/SiO2 composite was observed, and it was considered to be a compressive stress effect. The obtained SnO2 nanoparticles with a size of about 3.3 nm exhibit enhanced ethanol response at room temperature, and their recovery time is much shorter than that of the SnO2 nanocrystals with a size of about 6.4 nm.