微波诱导燃烧法合成类花状ZnO纳米材料及其晶体结构_荧光性质研究_英文_.docx

微波诱导燃烧法合成类花状ZnO纳米材料及其晶体结构、荧光性质研究渊＊曹文毅刘柏林徐彦芹王亚涛（重庆大学化学化工学院，重庆400030）摘要：以硝酸锌[Zn(NO3)2·6H2O]和尿素[CO(NH2)2]作前驱体，通过微波诱导燃烧技术可控合成具有不同形貌的ZnO纳米晶体，并用热重分析和差热分析进行了研究。对各种生长条件：微波功率，辐射时间和尿素/Zn2+物质的量的比对ZnO纳米晶体形貌的影响作了分析。结果表明：尿素/Zn2+物质的量的比对ZnO纳米材料的形貌具有显著影响。X衍射图表明合成的ZnO纳米结构呈六角形。傅里叶变换红外光谱图中400~500cm-1处明显的峰为Zn-O的振动峰。ZnO纳米结构的发光光谱在366nm的带边发射，因缺陷又由许多可见光发射峰组成。用扫描电子显微镜、透射电子显微镜、选区电子衍射研究了花状ZnO纳米结构的增长机理。本方法仅需几分钟就获得的了ZnO纳米结构。关键词：ZnO；微波燃烧；纳米结构；荧光中图分类号：O611.4文献标识码：A文章编号：1001-4861(2013)01-0190-09DOI:10.3969/j.issn.1001-4861.2013.00.023MicrostructuresandPhotoluminescencePropertyofFlower-LikeZnONanopowdersSynthesizedbyMicrowave-InducedCombustionTechniqueCAOYuan＊WENYiLIUBo-LinXUYan-QinWANGYa-Tao(CollegeofChemistryandChemicalEngineering,ChongqingUniversity,Chongqing400030,China)Abstract:ZnOcrystalswithdifferentmorphologieswerecontrollablysynthesizedbythemicrowave-inducedcombustiontechnique.Asolutionofzincnitrate[Zn(NO3)2·6H2O]andurea[CO(NH2)2]wasusedastheprecursor.TheprecursorofZnOnanocrystalpowderswasstudiedbyTG-DTAanalysis.Theeffectofgrowthconditions,suchasmicrowavepower,radiationtime,andurea/Zn2+molarratio,onthemorphologyoftheZnOnanocrystalswasinvestigated.Theresultsshowthatthemolarratioofurea/Zn2+isthekeyfactoraffectingthemorphologyoftheZnOnanostructures.X-raydiffractionstudyindicatesthatthesynthesizedZnOnanostructureishexagonal.AsharpZn-Ovibrationpeakat400~500cm-1confirmsthepresenceofZnO.ThephotoluminescencespectrumofZnOnanostructureconsistsofaband-edgeemissionat366nmandvisiblelightemissionpeaksduetodefects.Basedonthemorphologicalinformationprovidedbyscanningelectronmicroscopy,transmissionelectronmicroscopy,andselectedareaelectrondiffraction,agrowthmechanismfortheformationofflower-likeZnOnanostructuresissuggested.ItonlytakesafewminutestoobtainZnOnanostructuresbythepresentapproach.Keywords:ZnO;microwavecombustion;nanostructure;photoluminescenceZincoxide(ZnO)isanimportantdirectsemicond-uctorwithwidebandgapof3.37eVandlargeexcitonbindenergyof60meVatroomtemperature.Itsuniqueoptical,electronic,chemical,a