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1、水热法制备三维网状TiO2纳米线薄膜及其光电化学性能1874物理化学(WuliHuaxueXuebao)ActaP一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(TiO)的特殊结构以提高TiO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TiO纳米线
2、薄膜(w—film).通过场发射扫描电子显微镜(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Ti02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—30I1111,长度大于5m.利用紫外.可见分光光度计(LrV—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TiO纳米粒子(P25)薄膜(P—film)的吸收度,同时吸收带边发生红移,且吸光度随水热时问增加而增加.进一步在Na2SO溶液中研究了W—film的光电
3、化学性能,结果表明其光电化学性能较P—film优异.并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TiO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:0643PhotoelectrochemicalPropertiesofThree?DimensionalNetworkTiO2NanowireFilmPrepare
4、dbyHydrothermalMethodDONGXiangTAOJieLIYing—YingWANGTaoZHUHongfCollegeofMaterialScienceandTechnology,NanjingUniversityofAeronauticsandAstronautics,Nanjing210016,PR.China)Abs仃act:TheconstructionofTiO.withaspecialarchitecturetoenhancethephotocatalyticproperty
5、ofnano-titaniumdioxide(TiO2)wasachievedbysynthesizingathree—dimensional(3D)networkTiO2nanowirefilm(w-film)onthesurfaceofTifoilusingahydrotherrnalmethod.Sampleswerecharacterizedbyfieldemissionscanningelectronmicroscopy(FESEM)andX-raydiffraction(XRD).Results
6、showedthatthethree—dimensionalnetworknanowire丘lmwascomposedofmanyrandomly-orientedanatasenanowires.whichhaddiametersof10—30nmand1engths1argerthan5m.OpticalpropertiesoftheseW—filmswerestudiedbyUV—Visspectrophotometry(UV—Vis).Theresultsindicatedmattheabsorbe
7、ncyoftheW—filmwashigherthanthatofaparticulatefilmfP—film)inthe350-700nmregionandtheabsorptionedgewasred—shifted.Meanwhile,theabsorbencyoftheW—filmincreasedasthehydrothermaltimeincreased.Afterfu~erinvestigationofthephotoelectrochemicalpropertiesoftheW—filmi
8、nNa2SO4solution,wedeterminedthatthephotoelectrochemicalpropertiesof血eW—filmwerebe~erthanthoseofP.film.MethylorangewasusedasatargetmoleculetoestimatethephotocatalyticactivityoftheW—film.Underthesametestingcond
