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1、多孔氧化鋁模板制各znO納米陣列及其光學(xué)性能研究摘要本文以草酸為電解液采用二次陽極氧化法得到了具有孔徑大小相等,孔間平行且垂直于膜面、孔洞是較理想的圓形并在幾個(gè)um范圍內(nèi)構(gòu)成六角排布的理想孔結(jié)構(gòu)的非晶態(tài)多孔型氧化鋁模板。結(jié)合模板用直流電沉積和高溫氧化法制備了zn0/AA^l納米陣列,研究了zn0納米線的結(jié)構(gòu)形貌以及氧化溫度、納米線形態(tài)對(duì)陣列光致發(fā)光性能的影響。研究結(jié)果表明:用該方法制備的znO納米線是六方纖鋅礦結(jié)構(gòu),并是由若干單晶的納米顆?;騿尉Ъ{米區(qū)域組成,生長(zhǎng)過程中并沒有明顯的擇優(yōu)取向;隨著氧化溫度升高,Zn向ZnO轉(zhuǎn)化的
2、越完全,而且znO晶化得也越好;znO/從M納米線陣列體系的光致發(fā)光在藍(lán)綠波段,波長(zhǎng)范圍530一570nm,而且隨著氧化溫度升高束縛激子發(fā)射幾率升高,因而zn0發(fā)光峰位置隨著氧化溫度的升高而出現(xiàn)藍(lán)移;zn0納米線的直徑小于70nm時(shí),隨著納米線直徑增大,znO的紫外和藍(lán)光熒光發(fā)射均有藍(lán)移現(xiàn)象;當(dāng)直徑增至70nm時(shí),這種變化趨勢(shì)不再明顯,而且還出現(xiàn)了較寬的綠光熒光發(fā)射;70nm是znO納米線結(jié)構(gòu)和光學(xué)性能變化的臨界點(diǎn),zn0的發(fā)光性能對(duì)結(jié)構(gòu)敏感。基于上述研究成果,還氧化的同時(shí)通入NH3實(shí)施對(duì)znO氮的摻雜,并發(fā)現(xiàn)ZnO:N/從M
3、體系紫外熒光發(fā)射增強(qiáng),藍(lán)綠帶發(fā)光減弱。關(guān)鍵詞:多孔氧化鋁模板氧化鋅光致發(fā)光納米陣列直流電沉積SynthesisandPhotoluminescentPropertiesofZnONanoarraysinAnodicAluminaMembraneAbstractInthispaper,anodicaluminamembrane(AAM)con協(xié)inedhighdensitynanoporouswhichhadthesamediameterandwereparalleltoeachomerswasabtained.Thenanop
4、oroushadidealcircularshapeandtheirdistributionwerehoneycombingandwereorderedinseveralmicrons.ThemethodsofDirect-electrodepositionandhightemperatureoxidationwereappliedtoprepareZn0/AAMnanoarrays,atthesametime,thestructureandappearanceofZn0nanowires,theinnuenceofoxida
5、tiontemperatureandnanowires’shapetothephotoluminescentpropertieswerestudied.Theresultsshowthat:ThestructureofZnOnanowirespreparedbythismethodwerehexagonalwurtziteandcomposedbynanoparticlesormonocrystaUine;therewerenOpreferredo“entation;MoreandmoreZntransformedtoZnOa
6、ndZnOcrystallinesgrewbetterwiththetemperatureofoxidationgrewhigher;ZnO/AAMnaIloarraysphotoluminedblue/greenlightsandthewavelengthwerein530-570nmandwouldblueshiftwiththetemperatureofoxidationgrewhigher;WhenthediameterofZnOnanowireswerelessthan70nm,thepeakofopticalspe
7、ctrumwouldblueshiftwiththediametergrowing;ButwhenthediameterweremorethaIl70nm,thephenomenonwouldbecomeunobVious,andwidegreenwavewouldbeobserved;Generally,70nmwasthecriticalpointofstructureandphotoluminescenceofZnOnanoarrays.InordertogetdopedZnOnanoarrays,NH3wereappl
8、iedduringZnoxidation.InVestigatedbyXRD,XPSandPLspectrometer,we’vefoundthatNwassuccessfullydopedinZn0andtherewasstrongultravioletnuOrescenc