用高速剪切乳化機制備納米氧化鋅及其形狀控制.pdf

1、華中師范大學(xué)碩士學(xué)位論文用高速剪切乳化機制備納米氧化鋅及其形狀控制姓名：徐國旺申請學(xué)位級別：碩士專業(yè)：物理學(xué)指導(dǎo)教師：黃新堂20061101⑥碩士學(xué)位論文MASTER’STHESISAbstractZincoxide(zno)isanimportantmemberintheII—VIgroupsemiconductorswithwidedirectbandgapenergyof337eVThelargeexcitonbindingene

2、rgy(60meVGaN：25meVZnSe：22meVlofZnOcrystalcanensureefficientexcitonicemissionofultraviolet(UV)luminescenceatoraboveroomtemperatureSinceroom—temperaturefreeexcitionabsorptionandluminescencehavebeenobservedinZnOthinfilmsin1

3、997，ZnObecomeoneofthemajorfocusesintheresearchfieldofsemiconductorshortwavelengthdevicesFurthermoreZnOjsauniquematerialthatexhibitssemiconductingandpiezoelectricdualpropertiesStructurally，duetothethreetypesoffastestgrowt

4、hdirections(100m】)，(【01lo]，[1010】，【1100】)，and(【2110】，【1210】，【1120】)，aswellasthe(0001)polarsurfaces，variOuskindsofZn0nanostructureshavebeenrealized，suchasnanodots，nanorods，nanowires，fianobelts，nanotubes，nanobridgesandnano

5、nails，nanohelixes，seamlessnanofingsandpolyhedralcagesTheseuniquenanostructuresunambiguouslydemonstratethatZnOprobablyhastherichestfamilyofnanostmcturesamonga11materials，bothinstructuresandinpropertiesTheZnOnanostructures

6、couldhavegreatpotentialapplicationsinoptoelectronics，sensors，transducersandbiomedicalsciencessuchaslight—emittingdiodes，photodiodes，nanolasers，dye—sensitizedsolarcells，varistors，photocatalysis，andgassensorsNow，searchingn

7、ewstructures，propertiesandapplicationsofllanosizedZnOhasbecomeoneofthemostlyimportantfieldsinmalerialsscienceInthispaper，wepresetRthepreparationmethodofnano—sizedZnOmaterialsbyusinghi臥一shearmulser，researchtheresponsecond

8、itionofpreparationandmorphologycontrolofnano—sizedzincoxidewiththehigh—shearmulser，Changetheexperimentalcondition(forexample，reactiontemperature，reactiontime，thePHvalue，rotatingspeedandagitationwayofthemulser)，andobserve