Band-structure modulation of SrTiO3 by hydrogenation for enhanced photoactivity
Band-structure modulation of SrTiO3 by hydrogenation for enhanced photoactivity
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通过氢化调节 SrTiO3 的能带结构以增强光活性
DOI：
10.1007/s00339-012-6867-9
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发表时间：
2012-07-01
影响因子：
2.7
通讯作者：
Lu, Ming
中科院分区：
文献类型：
--
作者：
Sun, Tao;Lu, Ming
利用紫外-可见光(UV-vis)吸收、X射线光电子能谱(XPS)、电子顺磁共振(EPR)和光致发光(PL)对SrTiO3(STO)的加氢调制能带结构进行了系统研究。 STO 的氢化是通过在 H2:N2 (5%:95%) 合成气体中在高温（大多在 1000°C）下对 STO 进行退火来进行的。研究发现，由于氢化作用，电子转移到STO带隙内的缺陷态，导致STO可见光吸收、本征PL强度降低、费米能级移动、EPR信号消除，最终光催化能力增强。
A systematic study on the band-structure modulation of SrTiO3 (STO) by hydrogenation has been done by means of ultraviolet-visible (UV-vis) absorption, X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR) and photoluminescence (PL). Hydrogenation of STO was performed by annealing STO in the forming gas of H2:N2 (5 %:95 %) at elevated temperatures (mostly at 1000 °C). It is found that electron transfer to the defect states within the band gap of STO due to hydrogenation brings to STO visible absorption, decrease in intrinsic PL intensity, Fermi level shift, elimination of the EPR signals, and finally, an enhancement of photocatalytic ability.