稀有金属材料与工程
稀有金屬材料與工程
희유금속재료여공정
RARE METAL MATERIALS AND ENGINEERNG
2008年
z2期
8-11
,共4页
二氧化钛%薄膜%有机半导体%低温制备%光催化
二氧化鈦%薄膜%有機半導體%低溫製備%光催化
이양화태%박막%유궤반도체%저온제비%광최화
titanium dioxide%thin films%organic semiconductors%low-temperature preparation%photocatalysis
采用具有锐钛矿晶粒的TiO2溶胶,通过浸渍提拉的方法,在载玻片上低温制备了具有光催化活性的TiO2薄膜.为进一步提高薄膜的光催化活性,采用掺杂了聚苯乙烯磺酸盐的聚乙撑二氧噻吩作为TiO2薄膜的涂膜基底,采用SEM、PL光谱等测试方法考察了该有机半导体基底对TiO2薄膜性能的影响,并就TiO2薄膜厚度对两种基底上薄膜光催化活性的影响及其机理进行了讨论.结果表明:电子从有机半导体向TiO2的迁移使得光生电荷较好地分离,从而增加了表层TiO2的空穴浓度.同时发现合适的TiO2厚度能够有效地提高薄膜的光催化活性.
採用具有銳鈦礦晶粒的TiO2溶膠,通過浸漬提拉的方法,在載玻片上低溫製備瞭具有光催化活性的TiO2薄膜.為進一步提高薄膜的光催化活性,採用摻雜瞭聚苯乙烯磺痠鹽的聚乙撐二氧噻吩作為TiO2薄膜的塗膜基底,採用SEM、PL光譜等測試方法攷察瞭該有機半導體基底對TiO2薄膜性能的影響,併就TiO2薄膜厚度對兩種基底上薄膜光催化活性的影響及其機理進行瞭討論.結果錶明:電子從有機半導體嚮TiO2的遷移使得光生電荷較好地分離,從而增加瞭錶層TiO2的空穴濃度.同時髮現閤適的TiO2厚度能夠有效地提高薄膜的光催化活性.
채용구유예태광정립적TiO2용효,통과침지제랍적방법,재재파편상저온제비료구유광최화활성적TiO2박막.위진일보제고박막적광최화활성,채용참잡료취분을희광산염적취을탱이양새분작위TiO2박막적도막기저,채용SEM、PL광보등측시방법고찰료해유궤반도체기저대TiO2박막성능적영향,병취TiO2박막후도대량충기저상박막광최화활성적영향급기궤리진행료토론.결과표명:전자종유궤반도체향TiO2적천이사득광생전하교호지분리,종이증가료표층TiO2적공혈농도.동시발현합괄적TiO2후도능구유효지제고박막적광최화활성.
TiO2 film was prepared on the microscope slide by dip-coating process using the TiO2 sol,which contained anatase crystalline grains.This film had photocatalytic activity directly without an annealing step in a typical sol-gel method.With an attempt to enhance the photocatalytic activity of the TiO2 film,poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonic acid)(PEDT/PSS,an organic semiconductor)film was used as a substrate of the TiO2 film.To understand the beneficial effect of PEDT/PSS to the photocatalytic activity of the TiO2,scanning electron microscopy(SEM)and photoluminescence(PL)emission spectra were adopted.The effect of the thickness of TiO2 film on the photocatalytic activities of the two kinds of films and their photocatalytic reaction mechanisms were also discussed.The results show that the PEDT/PSS layer induces a better charge separation due to electron transfer from TiO2 layer to PEDT/PSS layer,and thus increases the amount of the hole in the superficial TiO2 layer.The appropriate thickness of TiO2 layer is effective for improving the photocatalytic activity of TiO2.
