低維氧化鎢納米材料的制備及其應用研究.pdf

1、蘭州大學博士學位論文低維氧化鎢納米材料的制備及其應用研究姓名：黃凱申請學位級別：博士專業(yè)：凝聚態(tài)物理指導教師：賀德衍20080501AbstractAsallimportantfundamentaltransitionmetaloxide，tungstenoxidesarcofgreatinteresttoresearchersandhavebeenextensivelyinvestigatedowingtotheirpromising

2、physicalandchemicalpropertiesWiththeoutstandingelectrochromic，optoehromicandgasochromicproperties，tungstenoxideshavebeenattractedtoconstructflatpaneldisplays，electrochromic“smart’windows，opticalmodulationdevices，writerea

3、deraseopticaldevices，gassensors，humiditytemperaturesensorsandfieldemissiondevicesinthepastfewdecadesInthispapertungstenoxidehasbeensearchedfromfourdifferentapplicationfieldsPeroxopolytungsticacidsolwassynthesizedforprepa

4、ringtungstenoxide(W03)filmsbydipcoatingtechniqueOptical，electrochemicalandstructuralpropertiesofthefilmsasafunctionofcolorationbleachingcyclewerecharacterizedbyultravioletvisiblespectrophotometercyclicvoltammetryXraydiff

5、ractionandscanningelectronmicroscopyXRDpeakswerefoundforthefilmsbeingcycledmorethan2000，andtheirregularcracks，uniformnanoparticlesandnovelnanobladeswereobservedonthelong—termcycledfilmsurfacebySEMThedegradationoftheelect

6、rochromicbehaviorisduetothestructuralcrystallizationoftheW03filmsaRerthelongtermcyclingTungstenoxidenanowirearrayshavebeengrownonindiumtinoxidecoatedglasssubstrateusingtungstentrioxidepowdersassourcebythermalevaporationa

7、pproachwithoutanycatalystsTheinfluencesoftheoxygenconcentration，thesubstratetemperatureandthedepositiontimeonthegrowth，densityshapeandstructureofthenanowireswereinvestigatedThepossiblegrowthmechanismwhichgovernsthevariou

8、stypesofnanowirearraysisalsodiscussedThefieldemissionpropertiesofthetungstenoxidenanowirearrayshavebeenresearchedTherelationshipbetween】BanddhasbeenproposedtodiscussbyaTRFEmodelBasedonthetungstenoxidesnanowires，singlenan