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1、物理化学学报(WuliHuaxueXuebao)1874ActaPhys.-Chim.Sin.,2009,25(9)：1874-1882September[Article]www.whxb.pku.edu.cn水热法制备三维网状TiO2纳米线薄膜及其光电化学性能*董祥陶杰李莹滢汪涛朱宏(南京航空航天大学材料科学与技术学院,南京210016)摘要：为了构建纳米二氧化钛(TiO2)的特殊结构以提高TiO2纳米材料的光催化性能,利用水热法在钛箔表面制备了三维网络结构的TiO2纳米线薄膜(W-film).通过场发射扫描电子显
2、微镜(FESEM)及X射线衍射(XRD)仪对样品进行了表征.结果表明,三维网络TiO2纳米线薄膜是由大量非定向生长的锐钛矿型纳米线组成,直径为10-30nm,长度大于5μm.利用紫外-可见分光光度计(UV-Vis)对W-film进行光学性能研究,结果表明在350-700nm波长范围内W-film的吸光度均大于TiO2纳米粒子(P25)薄膜(P-film)的吸收度,同时吸收带边发生红移,且吸光度随水热时间增加而增加.进一步在Na2SO4溶液中研究了W-film的光电化学性能,结果表明其光电化学性能较P-film优异.并
3、以甲基橙为目标降解物考察了W-film的光催化性能.在相同测试条件下,W-film光催化降解甲基橙的速率是P-film的2.3倍,展示了良好的应用前景.这种复合W-film电极兼有柔性和可外加电场的双重优点,拓展了TiO2薄膜的应用领域.关键词：二氧化钛;纳米线;薄膜;水热法;钛箔中图分类号：O643PhotoelectrochemicalPropertiesofThree-DimensionalNetworkTiO2NanowireFilmPreparedbyHydrothermalMethod*DONGXiang
4、TAOJieLIYing-YingWANGTaoZHUHong(CollegeofMaterialScienceandTechnology,NanjingUniversityofAeronauticsandAstronautics,Nanjing210016,P.R.China)Abstract：TheconstructionofTiO2withaspecialarchitecturetoenhancethephotocatalyticpropertyofnano-titaniumdioxide(TiO2)wasac
5、hievedbysynthesizingathree-dimensional(3D)networkTiO2nanowirefilm(W-film)onthesurfaceofTifoilusingahydrothermalmethod.Sampleswerecharacterizedbyfieldemissionscanningelectronmicroscopy(FESEM)andX-raydiffraction(XRD).Resultsshowedthatthethree-dimensionalnetworkna
6、nowirefilmwascomposedofmanyrandomly-orientedanatasenanowires,whichhaddiametersof10-30nmandlengthslargerthan5μm.OpticalpropertiesoftheseW-filmswerestudiedbyUV-Visspectrophotometry(UV-Vis).TheresultsindicatedthattheabsorbencyoftheW-filmwashigherthanthatofaparticu
7、latefilm(P-film)inthe350-700nmregionandtheabsorptionedgewasred-shifted.Meanwhile,theabsorbencyoftheW-filmincreasedasthehydrothermaltimeincreased.AfterfurtherinvestigationofthephotoelectrochemicalpropertiesoftheW-filminNa2SO4solution,wedeterminedthatthephotoelec
8、trochemicalpropertiesoftheW-filmwerebetterthanthoseofP-film.MethylorangewasusedasatargetmoleculetoestimatethephotocatalyticactivityoftheW-film.Underthesametestingconditions,
