瞬态光电导谱研究Pt的负载对TiO_2光生载流子寿命的影响  

Effect of Platinum Loading on Lifetime of Photogenerated Charge Carriers of TiO_2 Studied by Time-resolved Photoconductivity

作　　者：张雯[1] 王绪绪[2] 付贤智[2] 

机构地区：[1]福建师范大学化学与材料学院,福州350007 [2]福州大学化学与化工学院光催化研究所,福州350002

出　　处：《高等学校化学学报》2005年第10期1861-1864,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20133010);福建省自然科学基金(批准号:Z0513010);福建省教育厅(批准号:JB04238)资助.

摘　　要：采用瞬态光电导谱研究了TiO2的光电导衰减曲线,通过计算机拟合得到光生载流子的寿命,并考察了Pt的负载量对TiO2光生载流子有效寿命的影响.结果表明,增大Pt的负载量,可延缓光电导的衰减趋势,从而延长TiO2光生载流子的有效寿命,有效地降低了光生载流子的复合率.Time-resolved photoconductivity （TRPC） was used to study the photoconductivity decay of TiO2 and the lifetime of the photogenerated charge carriers. Also, we investigated the influence of platinum loading on the characters of the photogenerated charge carriers of TiO2. The results showed that the decay tendency of TiO2 was delayed with the increase of platinum loading and the effective lifetime of the photogenerated charge carriers of TiO2 containing 1.0% Pt（ mass fraction） was prolonged to 1.57 ms from 0. 16 ms without Pt loading. The mentioned results suggested that in the presence of Pt the photogenerated electrons of TiO2 transfer to Pt from semiconductor rapidly, resulting in achieving the effective separateness between the photogenerated electrons and holes, prolonging the effective lifetime of the photogenerated carriers, decreasing the recombination rate of photogenerated electrons and holes, and increasing the quantum efficiency of the photocatalytic reaction.

关 键 词：瞬态光电导谱 TIO2 PT/TIO2 

分 类 号：O643.36[理学—物理化学]