Surface states in template synthesized tin oxide nanoparticles
Surface states in template synthesized tin oxide nanoparticles
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DOI：
10.1063/1.1639946
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发表时间：
2004-01
影响因子：
3.2
通讯作者：
A. Cabot;J. Arbiol;R. Ferré;J. Morante;F. Chen;Meilin Liu
中科院分区：
文献类型：
--
作者：
A. Cabot;J. Arbiol;R. Ferré;J. Morante;F. Chen;Meilin Liu
在二氧化硅介孔模板中物理包裹的同时，合成了具有可控窄尺寸分布的氧化锡纳米颗粒。通过紫外-可见光谱，观察到光吸收边的红移。光致发光测量证实了3.2 eV处光学跃迁的存在。即使在800℃焙烧的模板合成纳米粉末中也存在半导体禁带，这与通过其他方法获得的材料的带隙状态的演变形成了鲜明对比。因此，能隙状态被认为是表面局域化的，随着表面刻面而消失，或者被表面与体积比的减小所隐藏。
Tin–oxide nanoparticles with controlled narrow size distributions are synthesized while physically encapsulated inside silica mesoporous templates. By means of ultraviolet-visible spectroscopy, a redshift of the optical absorbance edge is observed. Photoluminescence measurements corroborate the existence of an optical transition at 3.2 eV. The associated band of states in the semiconductor gap is present even on template-synthesized nanopowders calcined at 800 °C, which contrasts with the evolution of the gap states measured on materials obtained by other methods. The gap states are thus considered to be surface localized, disappearing with surface faceting or being hidden by the surface-to-bulk ratio decrease.