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ID:8790194
大小:5.82 MB
页数:43页
时间:2018-04-07
《zno纳米晶合成毕业论文》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、摘要花状ZnO纳米晶合成及其光致发光性能研究学科:材料物理与化学作者:刘志强(签名)指导教师:张卫华(签名)摘要本文采用水热法,以氯化锌和氨水为原料,通过改变反应温度,反应环境pH值、锌离子浓度和预置ZnO纳米晶晶核获得不同形貌和尺寸的花状氧化锌纳米晶,实验结果表明:(1)反应温度对氧化锌纳米晶的形貌及单根棒直径有显著影响,反应温度升高将导致花状纳米氧化锌的外径变大,同时单根棒直径变粗。并且随着温度降低有利于制备尺寸均匀的纳米花状氧化锌。(2)锌离子浓度显著影响纳米花状氧化锌的尺寸以及形貌,以及
2、单根棒的尺寸。随着锌离子浓度的增加,花状纳米氧化锌的外径和单根棒的直径都随之显著增大,且花枝数目变多。(3)预置晶核显著影响纳米花状氧化锌的尺寸及形貌,经过预置的氧化锌与预置的晶核相比尺寸明显增大,并且尺寸变得均匀,花型完整。(4)纳米花状氧化锌的激发光谱位于200nm~300nm波段,采用215nm波长光作为激发光,其发射光谱位于400nm~600nm,在466nm左右波长的发光强度最强。随着纳米花状氧化锌棒径尺寸减小,最强峰发光强度增大。当纳米花状氧化锌棒径小于0.35um时,发光强度发生突
3、变,发光强度明显增强。关键字:水热法;花状氧化锌;纳米晶;预置晶核;光致发光特性I摘要ThestudyofFlower-likeZnOcrystalshydrothermalsynthesisandopticalpropertiesSubject:MaterialphysicsandchemistryWriter:ZhiqiangLiu(签名)Guider:WeihuaZhang(签名)AbstractByhydrothermalmethodinthispaper,usingthechlorid
4、ezincandammoniaasrawmaterials,aswellaschangingthereactiontemperatureandreactionvalueofpH,concentrationofzincionsandpresetZnOnanometernuclearinordertoobtaindifferentmorphologiesandsizesofflower-likeZnOcrystals,theexperimentresultsshowthat:(1)Thereacti
5、onoftemperatureaffectasignificantappearanceofZnOcrystalanddiameterofsinglerod.Theincreasingofreactionoftemperaturewillleadtoalargerouterdiameterflower-likeZnOwhilethediameterofsinglerodwillbecomethick.Zincionconcentrationsignificantlyaffectssizeandmo
6、rphologyofflower-likeZnO.Andwiththedecreasingofthetemperatureisfavorabletothepreparationofuniformsizeofnanometerzincoxide.(2)Zincionconcentrationsignificantlyinfluencesthesizeofflower-likeZnOnanometerandmorphology,aswellasthedimensionofsinglestick.Al
7、ongwithzincionconcentrationincreasing,outerdiameterofflower-likeZnOandasinglerodwillincreaseextremely,andthenumberofsquidsismore.(3)Thepresetnucleationextremelyeffectnanometerofflower-likeZnOsizeandshape,comparedthesizeofpresetzincoxideI摘要crystalnucl
8、euswithpresetincreasesignificantly,andthesizetobeeven,typeofflowerbecomecomplete.(4)nanometerflower-likeZnOexcitationspectrumisbetweenbandof200nmand300nm,usinglightofwavelengthof215nmasexcitationlight,theemissionspectrumisin400nm~600nm,wavelengthofar
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