一維金屬硫（氧）化物納米結構的制備與特性研究.pdf

1、東南大學博士學位論文一維金屬硫（氧）化物納米結構的制備與特性研究姓名：王巍申請學位級別：博士專業(yè)：凝聚態(tài)物理指導教師：劉楣王聲樂20070501東南人學博I：學位論文ABSTRACTInthepastdecade，thediscoveryofonedimensional(ID)nanostructures，includingnanotubes，nanowires，nanoeoaxialcableandnanobelts，hasstimu

2、latedgreatinterest，becauseofbo山theirinterestingphysicalpropertiesandtheirwiderangepotentialapplicationsinnanodevicesInthisthesis，researchesincludingasfollowingpartswerepresented：1)FeSandNickelSulfide(NixSv)nanowiresandna

3、notubesweresynthesizedSuccessfullybyusingadirectionalinfiltrationprocedureinwhichDMSOactsasbothsulfursourceanduniqueinfiltratorItisimportanttOfindthattheFeSnanowirestendingtosuperparamagneticpropertyatroomtempemturewheni

4、tsdiameterdecreasetoabout20nmBesidesthenanowiresdiametersweretunableviaadjustingabsorptionofammoniagasNiS2nanotubeswith200nrfldiameterand20nmtube—Wallthicknessexhibitferromagneticinteractions(Hc=36590e)ItiSexpectedthalth

5、isselfassemblyroutecouldbeapromisingtechniquetosynthesize1Dnanostructuresofothel“metalchalcogenidescompositesand2Dor3Dnanonetworks21Fe304singlecrystalnanowireswitheasyaxisperpendiculartowire—axisweresynthesizedbyaselfdes

6、ignedintrogressionerodemethodinAAOtemplateviamagneticfield—inducedtechniqueTheresultsshowthatthecrystalmicrostructuresofmagneticsinglenanowirescouldbechangedbyusinginducedmagneticfeldThesechangesmayresultinhighel“magneti

7、zationintensity(82em昨)，lowercoerciveforce(8530e)andremanenceApotentialhighmagneticconductivityWaspredicted3)Fe304singlecrystalnanobelts、vith【110】preferentialgrowthweresynthesizedbywelldesignedcontactstylebetweensubmicron

8、dropletwitllotherreactantsolutionundermagneticfieldBothgrowthdirectionandeasymagneticdirectionofthesinglecrystalnanobeltswerethatalong【110]，andwhichWasconfirmedresultingfromtheexternalinducemagneticfield4)Animprovedultra

9、sonicspraypyrolysismethodWassuccessfullyappliedtodepositBiSI，inwhichthegrowthdirectionoftherodscouldbecontrolledeasilyalongperpendiculartosubstrateBesidesthis，7Gd2S3nanoscalepolycrystallinethinfilmswerealsodepositedbyasy

10、nchronouspulseultrasonicspraypyrolysismethodonglassatrelativelylowtemperaturewithoutanycomplexingagentKEYWORDS：Nanowire；Nanotube；Nanobelt；Fermrngroupsulfide；Singlecrystal；Magneticfieldinduce；Introgressionerodemethod：Ultr