Temperature- and oxygen partial pressure-dependent electrical conductivity in nanoporous rutile and anatase
Temperature- and oxygen partial pressure-dependent electrical conductivity in nanoporous rutile and anatase
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DOI：
10.1063/1.125513
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发表时间：
1999-12-20
影响因子：
4
通讯作者：
Lauermann, I
中科院分区：
文献类型：
--
作者：
Dittrich, T;Weidmann, J;Lauermann, I
通过阻抗谱研究了烧结纳米多孔TiO 2（金红石和金红石）层的电导率（σ）对温度（T）和氧分压（p（O 2））的依赖性，T高达450 ℃，p（O 2）高达10（-5）mbar。TiO 2纳米颗粒的直径在5和60 nm之间变化。σ是热激活的，E-A=0.85 eV，与σ的绝对值无关，并取决于p（O2），p（O2）< 1-10 mbar。还原后的纳米多孔TiO 2的电学性质是由表面化学反应决定的，表面化学反应导致浅施主态和深陷阱态的形成。(C)1999年美国物理学会。[S0003-6951（99）03551-2]。
The dependence of the electrical conductivity (sigma) of sintered nanoporous TiO2 (rutile and anatase) layers on temperature (T) and partial pressure of oxygen (p(O2)) has been studied by impedance spectroscopy for T up to 450 degrees C and p(O2) up to 10(-5) mbar. The diameter of the TiO2 nanoparticles was changed between 5 and 60 nm. sigma is thermally activated with E-A=0.85 eV independent of the absolute value of sigma and depends on p(O2) by power law for p(O2)< 1-10 mbar. The electrical properties of reduced nanoporous TiO2 are determined by surface chemical reactions which lead to the formation of shallow donor and deep trap states. (C) 1999 American Institute of Physics. [S0003-6951(99)03551-2].