Effect of copper precursor on the stabilization of titania phases, and the optical properties of Cu/TiO2 prepared with the sol-gel technique

被引:71
作者
Bokhimi, X [1 ]
Morales, A [1 ]
Novaro, O [1 ]
Lopez, T [1 ]
Chimal, O [1 ]
Asomoza, M [1 ]
Gomez, R [1 ]
机构
[1] UNIV AUTONOMA METROPOLITANA IZTAPALAPA,FAC QUIM,MEXICO CITY 09340,DF,MEXICO
关键词
D O I
10.1021/cm970279r
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In the sol-gel Cu/TiO2 system, nanocrystalline brookite, which was stable even after annealing the sample at 400 degrees C, was generated in high concentrations. This was achieved with copper chloride as copper precursor. The respective samples had a light absorption band at 562 nm that corresponded to an energy bandgap of 2.30 eV, which is smaller than the values reported for titania. When copper sulfate was the precursor, brookite was absent, but nanocrystalline anatase, the main phase, was stabilized even at 800 degrees C by sulfate ions. After annealing the samples at low temperatures, copper was well dispersed for 1 wt % copper, but part of it segregated forming copper compounds when the copper concentration was 10 wt %. By annealing the samples at 800 degrees C, copper oxidized to CuO; except in the 10 wt %-copper sample prepared with copper sulfate, where it formed antlerite.
引用
收藏
页码:2616 / 2620
页数:5
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