鈦酸鋇反蛋白石結(jié)構(gòu)光子晶體的制備.pdf

1、天津大學(xué)碩士學(xué)位論文鈦酸鋇反蛋白石結(jié)構(gòu)光子晶體的制備姓名：向安申請學(xué)位級別：碩士專業(yè)：應(yīng)用化學(xué)指導(dǎo)教師：于九皋高建平20021201AbstractPhotoniccrystals(PCs)arematerialspaternedwithaperiodicityindielectricconstantwhichcancreatearangeof`forbiddenfrequenciescalledaphotonicbandgapanal

2、ogoustotheelectronicbandgapinasemiconductor.Photonswithenergieslyinginthebandgapcannotpropagatethroughthemedium.PCshavethecharactersofphotonicbandgapandphotonlocalizationwhichmakePCscontrolandenhancethespontaneousemissio

3、nofexcitedatoms.Theseprovidetheopportunitiestoshapeandmouldtheflowoflightforphotonicinformationtechnologyandphotoniccomputerinthefuture.Inthisthesisthefabricationandcapabilityofthepolystyreneopalcolloidalcrystalandthetit

4、aniaorbariumtitanateinvertopalstructurephotoniccrystalarepresentedFirstwegotthemonodispersedpolystyrene(PS)sphereswithdiferentdiametersbyemulsionpolymerizationandthenthecompositespheresofPSandtitania(Ti02)orPSandbariumti

5、tanate(BaTi03)wereformedbyinsituemulsionpolymerization.orinsituSolGeltechnique.SecondthePSPST02andTiO2PSopalsstructurecolloidalcrystalswereformedbyselfassemblyduringwhichthedispersityofthePSspherestemperatureandhumidityo

6、fthesurroundingswerethemajorfactorsthatafectthearrayofthespheres.AtlowtemperatureandhighhumiditythelongrangeorderedtemplatewasassembledbyslowlygrowingcolloidalcrystalsfrommonodispersedpolystyrenespheresandopalsPScolloida

7、lcrystalswereformedbycarefullydrying.TheopalsPScolloidalcrystalsshowedtheincompletephotonicbandgapwhichcouldbeenhanced妙replacingthePSsphereswithPSMO2orTiOZIPScompositespheresThirdwefabricatedlargehighlyorderedbariumtitan

8、ateinvertopalstructurePCsbytemplateassistedgrowth.ThetemplateisthePScolloidalcrystal.Temperatureisoneofthefactorsthatafectthequalityofthebariumtitanateinvertopals.Whenthetemperatureexceeded7000Cthelongrangeorderedinverto

9、palsstructurecannotbeobtainedduetotherecrystallizationofthebariumtitanate.Intheinvertopalstheairsphereswereclosepackedandinterconnectedwiththeneighborairspheresthroughthewindowsonthebariumtitanatewals.Thelatticeparameter

10、wasshrunkbyabout30%relativetothetemplateirrespectiveoftheradiiofthesphereswhilethelongrangeorderwasstillpreserved.Keywords:photoniccrystals(PCs)opalandinvertopalstructurecolloidalcrystalsbariumtitanatetitaniacompositesph