环氧化物法制备锑掺杂氧化锡气凝胶.pdf

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1、物理化学学报(WuliHuaxueXuebao)500ActaP．一C．Sin．2014，30(3)，500—507March【Article】doi：10．3866／PKU．WHXB201401201、]【rvr．whxb．pku．edu．cn环氧化物法制备锑掺杂氧化锡气凝胶虞秋捷周斌张志华刘光武杜艾(同济大学物理科学与X-程学院，上海市特殊人X-微结构材料与技术重点实验室，上海200092)摘要：以无机金属盐为前驱体，采用环氧丙烷添加法结合CO：超临界流体干燥和热处理工艺，制备了不同锑掺杂浓度的二氧化锡(ATO)气凝胶．所得气

2、凝胶为深蓝色块体，平均密度约为600mg·cm～，锑掺杂浓度在5％到20％(x)之间．电子显微镜图片显示ATO气凝胶的骨架由粒径约为数十纳米的颗粒堆积而成，而这些颗粒又由数纳米的初级球形颗粒构成．X射线衍射谱表明，样品的主要晶相为SnO四方相金红石结构，锑的掺杂仅引起微小的晶格畸变．X射线光电子谱显示锡元素以+4价态存在，而锑则具有+3和+5的混合价态．四探针电阻率测试仪的结果表明，ATO气凝胶的电阻率在2．7—40Q·cm之间变化，其中在锑掺杂浓度(x)为12％时具有最低电阻率．关键词：锑掺杂二氧化锡：气凝胶：环氧丙烷：超临界干

3、燥：电阻率中图分类号：0648．17Antimony-DopedTinOxideAerogelBasedonEpoxideAdditionaIMethodYUQiu—JieZHOUBinZHANGZhi—HuaLIUGuang-WuDUAiShanghaiKeyLaboratoryofSpecialArtificialMicrostructureMaterialsandTechnology,SchoolofPhysicsScienceandEngineering,Tong／iUniversity,Shanghai200092，PR

4、．China)Abstract：Antimony．dopedtinoxidefrO)aerogelswerepreparedfr0minorganicsaltsviaepoxideadditionalmethod。CO2supercriticalfluiddryingandthermaItreatment．ATOsamplesweredarkbluemonolithswithaveragedensityofabout600mg·cm0andSbconcentrationsof5％一20％(x)．Electronmicroscopy

5、showedthattheskeletonoftheATOaerogelsconsistedofparticlesofsizeofdozensofnanometers。whichfurtherconsistedofprimaryparticlesofsizeaboutseveraInanometers．X．raydifractionspectrashowedthatthemaincrystalstructurewithintheATOaerogelswastetragonaItindioxide．whileSbdopingonly

6、resultedinminorIatticedistortion．X-rayphotoelectronspectroscopyindicatedthatthevalencestateoftinwas+4．whileantimonywasmixedwith+3and+5valences．Four-pointproberesistivityanalysisexhibitedthattheelectricaIresistivityoftheAr0aerogelschangedfr0m2_7to40Q·cm．amongwhichtheae

7、rogelwith12％SbhadtheIowestresistivityKeyWords：Antimony-dopedtinoxide；Aerogel；Propyleneoxide；SupercriticaldryingElectricalresistivityReceived：October6，2013；Revised：January17，2014：PublishedonWeb：January20，2014．Correspondingauthors．zH0UBin，Email：zhoubin863@．tongji．edu．cn

8、．DUAi，Email：duai@ton~i．edu．ca．TheprojectwassupportedbytheNationalNaturalScienceFoundationofChina(51l02184，5l172163)，Nationa1