元素掺杂对碳纳米管电磁性能的影响

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1、西南交通大学硕士学位论文元素掺杂对碳纳米管电磁性能的影响姓名：钱兰申请学位级别：硕士专业：材料学指导教师：江奇;张勇20070501西南交通大学硕士研究生学位论文第1I页AbstractSincethediscoveryofCarbonNanotubes(CNTs)in1991，itsuniquestructureandexcellentmechanical，electrical，magneticalperformancehavebeenfocusedbymanyresearchers．Dopingte

2、chniquemeansaddingalittlemaUer(prelement)intopristinesamplewithkeepingthesample'spristinemaincomponen4that’Sforchangingthephysicalandchemicalperformanceofthesample．Generallyspeaking,CNTS’crystalstructureandelectronicstructuremayhavebeenchangedafterbeingd

3、oped谢thothermatter(forexample，Boron)，andthusresultingthechangingofthesamplephysicalproperty．，InthisthesistWeaddedboronpowderandmagnesiumpowderintoCNrswithkeepingtheCNTs’hollownanotubesstructure,inordertocontrol／andchangecT、gr$’magneticsperformance．1．Boro

4、ncarbidenanotubes(nano·fibers)werepreparedbyboronpowderandCNTs越hightemperatureinaquartztubeinvacuumedair．Themorphology，microstructure，componentandmagneticpropertyofthesampleswerecharacterizedbyTransmissionelectronmicroscopy,X-raydiffraction,X-rayphotoele

5、ctronspectroscopyandMPMScontroller．Themsultsshowedthattheboron-dopingCNTshavegreatdifferentmorphologyandmagneticpropertyfromthatofthepristineCNTs．2．WeusedBoronCarbonnanotubesasmatrix，addedmagnesiumpowderintothemarlxathightemperatureinaquartztubeinvacuume

6、dair．Themorphology，componentandmagneticpropertyoftheobtainedsampleswerecharacterizedbyTransmi龉ionelectronmicroscopy,Scanningelectronmicroscopy．X-raydiffractionandMPMScontroller．Theresultsshowedthatthesamplesofdopingmagnesiumappearedperfectdiamagnetism．an

7、ditstransitiontemperatureisabout30K．3．TheeffectofCNTs’contentondopingsamples’perfectdiamagnetismtransitiontemperaturewasstudied．Theresultsshowedthatthesamples’perfectdiamagnetismtransitiontemperaturehaddecreasedwiththeincreasingoftheCNTs’content．KeyWords

8、：CarbonNanotubes；magneticproperty；doping西南交通大学硕士研究生学位论文第68页声明本人声明所呈交的学位论文是本人在导师江奇的指导下进行的研究工作以及所取得的研究成果，倾注了本人和导师的大量，15血和汗水．本文中所查阅文献以及其他人的观点和研究成果之处，本人均作了标记，并附于论文的结语，在此表示感谢!除此之外，文中不包含其他人曾经或者发表过的成果，也不包含为获得西南交通大学学位或证书而使用的材料。本论文