資源描述:
《石墨烯的液相制備及其透明導(dǎo)電薄膜的研究》由會員上傳分享,免費在線閱讀,更多相關(guān)內(nèi)容在學(xué)術(shù)論文-天天文庫。
1、南京理工大學(xué)碩士學(xué)位論文石墨烯的液相制備及其透明導(dǎo)電薄膜的研究姓名:謝存存申請學(xué)位級別:碩士專業(yè):材料學(xué)指導(dǎo)教師:車劍飛20100620碩士論文石墨烯的液相制備及其透明導(dǎo)電薄膜的研究摘要本文首先以石墨粉末為原料,分別在N,N.二甲基甲酰胺(DMF)等有機溶劑和全氟磺酸樹脂(Nation)的水.乙醇溶液中直接超聲剝離,避免了石墨的氧化和還原兩個復(fù)雜的過程,得到了質(zhì)量較高的石墨烯分散液。然后過濾去離子水稀釋的石墨烯分散液制備透明導(dǎo)電薄膜,并考察了不同處理條件對薄膜性能的影響。透射電子顯微鏡(TEM)測試結(jié)果表明,液相中超聲處理石墨得到了石墨烯。紅外光譜、拉曼光譜和XP
2、S測試分析表明,石墨烯產(chǎn)品的結(jié)構(gòu)缺陷少,氧化程度低。沉降實驗結(jié)果表明石墨烯在Dm和Nation溶液中都具有良好的分散穩(wěn)定性。采用了光學(xué)顯微鏡、場發(fā)射掃描電子顯微鏡(FESEM)、紫外.可見分光光度計(UV-Vis)和四探針儀對石墨烯薄膜進行了表征。實驗結(jié)果表明:過濾法制備的薄膜均勻致密;隨著分散液用量的增加,薄膜的透光率和電阻率下降。為了提高薄膜的性能,采用了酸處理、真空退火處理、空氣退火處理和酸處理+空氣退火處理。結(jié)果發(fā)現(xiàn),經(jīng)過前兩種處理后,薄膜的性能沒有明顯的改善;后兩種處理對提高薄膜透光率,降低其電阻率有顯著成效。最終得到了表面電阻率為2K.Q/sq一3Kf
3、gsq,550nlIl波長可見光透過--率>80%的透明導(dǎo)電薄膜。關(guān)鍵詞:石墨烯,液相剝離,薄膜,透光率,表面電阻率Abstract碩士論文Inthisstudy,graphitepowderwassonicatedinorganicsolventssuchasN,N-Dim-ethylformamide(DMF)andsolutionofaperfluorosulfonatedcation-exchangepolymer(Nation),respectively,toproducehighqualitygraphenedispersion.Thisprocess
4、avoidedcomplicatedoxidationandreduction.GraphenedispersionWasdilutedbydeionizedwaterandvacuumfilteredtopreparetransparent,conductivefilms.Andthepropertiesofgraphenefilmswereinvestigated、析也differenttreatments.Graphenepreparedbyliquid·phasesonicationofgraphite,Wasinvestigatedbytransmiss
5、ionelectronmicroscopy(TEM).Fouriertransforminfraredspectroscopy(FT-IR),RamanspectroscopyandX-rayphotoelectronspectroscopy(xPs).Theresultsshowedthattheas—preparedgraphenehadfewdefectsandWasnotheavilyoxided.SettlementexperimentsrevealedthatgrapheneinDMFandNationsolutionwaswelldisperseda
6、ndquitestable.Graphenefilms,depositedbyvacuumfiltration,werecharacterizedbyopticalmicroscope,fieldemissionscanningelectronicmicroscopy(FESEM),UV-VisspectroscopyandFour-Probeinstruments.ItWasfoundthatthesethinfilmswerehomogeneousanddense.Withtheincreaseofthevolumeofgraphenedispersion,t
7、hetransparencyandsheetresistivityoffilmsdecreased.Inordertoimprovefilms’properties,graphenefilmsweretreatedbynitricacid,vacuum-annealed,air-annealedandacid-treated&air-annealed,respectively.Afterthefirsttwotreatments.graphenefilms’Sperformancewerenotobviouslyenhanced.Whilethelattertwo
8、treat