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1、中國科技論文在線http://www.paper.edu.cn雙稀土摻雜TiO2納米管陣列的制備及其#光電催化性能111121**尹云超,薛鵬,萬俊,劉恩周,胡曉云,樊君5(1.西北大學化工學院,西安,710069;2.西北大學物理學院,西安,710069)摘要:通過兩步陽極氧化法分別制備了TiO2納米管陣列(TiO2NTs)、稀土元素Gd和Ce共摻雜TiO2納米管陣列(Gd/Ce-TiO2NTs)以及稀土元素Gd和Tm共摻雜TiO2納米管陣列(Gd/Tm-TiO2NTs)。表征了所制備樣品的形貌、結(jié)晶性和光吸收能力等。相比于未摻10
2、雜的TiO2NTs,Gd/Ce-TiO2NTs和Gd/Tm-TiO2NTs表現(xiàn)出更好的紫外-可見光吸收,這歸因于稀土元素的摻雜形成了雜質(zhì)能級。Gd/Tm-TiO2NTs表現(xiàn)出更高的光電流密度。另外,相比于TiO2NTs和Gd/Ce-TiO2NTs,Gd/Tm-TiO2NTs顯示出更低的熒光強度,這表明了其光生載流子的復(fù)合率最低。同時,相比于TiO2NTs和Gd/Ce-TiO2NTs,Gd/Tm-TiO2NTs也表現(xiàn)出最高的光電催化性能。這歸因于由于Gd和Tm的共摻雜TiO2NTs形成了雜質(zhì)能級15協(xié)同使樣品的光吸收增強,同時使光生載流
3、子的分離率提高。關(guān)鍵詞:TiO2NTs;共摻雜;雜質(zhì)能級;陽極氧化法中圖分類號:O643Fabricationofco-dopedTiO2nanotubearrayswith20enhancedphotoelectrocatalyticactivities111121YINYunchao,XUEPeng,WANJun,LIUEnzhou,HUXiaoyun,FANJun(1.SchoolofChemicalEngineering,NorthwestUniversity,Xi'an710069,PRChina;2.Schoolofphy
4、sics,NorthwestUniversity,Xi'an710069,PRChina)Abstract:HighlyorderedTiO2nanotubearrays(TiO2NTs),Gd/CeandGd/Tmco-dopedTiO2nanotube25arrays(Gd/Ce-TiO2NTsandGd/Tm-TiO2NTs)weresynthesizedthroughatwo-stepanodizationmethod.Themorphology,crystallinityandlightabsorptioncapabilit
5、yofas-obtainedsamplesweredistinguishedbasedonvariouscharacterizations.Gd/Ce-TiO2NTsandGd/Tm-TiO2NTsexhibitedexcellentlightabsorptionwhichiscausedbytheformationofimpurityenergystatesnearboththebandedges.AndtheGd/Tm-TiO2NTsexhibitedthehighestcurrentdensitythanthatofthepur
6、eTiO2NTs30andGd/Ce-TiO2NTs.Besides,thePLintensityofGd/Tm-TiO2NTswaslowestthanthatofTiO2NTsandGd/Ce-TiO2NTs,revealingadecreaseinchargecarrierrecombination.ThephotoelectrocatalyticactivitiesoftheGd/Tm-TiO2NTshavebeensignificantlyenhancedcomparedtothatofun-dopedTiO2NTsandG
7、d/Ce-TiO2NTs,whichisascribedtotheimpurityenergystatesactingasthetrappingsitesforboththephoto-generatedchargestoreducetherecombinationprocess.35Keywords:TiO2NTs;co-doped;impurityenergystates;anodizationmethod0引言[1,2]目前,光電催化因具有更好的催化性能而受到廣泛關(guān)注。二氧化鈦(TiO2)具有活[3]40性高、熱穩(wěn)定性好以及優(yōu)良
8、的光電催化性能而常被用作光電催化的半導(dǎo)體材料。2001年,[4]Grimes研究組首次采用陽極氧化法成功制備出分布均勻、整齊有序的TiO2納米管陣列(TiO2NTs)。因其納米管狀結(jié)構(gòu)所具有的獨特物理化學性能而備受關(guān)注。