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1、酞菁裂解法多壁碳纳米管的制备、表征和应用第17卷第6期2004年12月化学物理CHINESEJOURNALOFCHEMICALPHYSICSV01.17.No.6Dec.200410o3.7713/2004/06-767—8酞菁裂解法多壁碳纳米管的制备,表征和应用郭燕川.,谢文委,(a.中国科学院理化技术研究所,北京100101;陈丽娟.,彭必先"b.中国科学技术大学化学系,合肥230026)摘要:为了探究高温处理酞菁钴对O:的催化还原作用,以酞菁钴作为催化剂的前体,通过化学气相沉积的方法,在850下,氩气与氢气混
2、合气流中,制备了双层定向碳纳米管,纳米管的直径分布在60～120nnl,长度约为40,在纳米碳管中包裹有直径为10Iun的钴颗粒.所得产品用透射电子显微镜和扫描电子显微镜进行了观察,并用拉曼谱和x射线衍射对样品进行了表征.通过循环伏安法测量得到纳米碳管对金属颗粒在酸性溶液中的腐蚀具有一定抵抗作用.认为少量的N对于竹节状碳纳米管的形成和金属对酸的抵抗作用是十分必要的,每节中碳壁的弯曲弧度则与N在碳纳米管中含量和N与金属的相互作用有关.另外,碳纳米管较大的电化学活性区域在电化学方面具有潜在的应用价值.关键词:纳米碳管;
3、化学蒸气沉积;扫描电镜中图分类号:O64文献标识码:APreparation,CharacterizationandApplicationofMulti—walledCNTsbymeansofPhthalocyaninePyrolysisGuoYanchuan,XieWenwei,ChenLijuan,PengBixian'(口.TechnicalInstituteofPhysicsandChemistry,ChineseAcademyofScicnce,&ng100101;b.TheUniversityo
4、fScienceandTechnologyofChinaDepa~memofChemistry,Hefei230026)AbstractInordertoinvestigatethecatalyticactivityofhightemperaturetreatedCoPctowardoxygenreduction,andfindtheactivesiteofthecatalyst,usingcobalt(II)phthalocyanine(CoPc)asrawmaterial,throughthermalchemi
5、calvapordepositionmethodat850~CunderacurrentofAr/H2,twolayerwell—alignedmultiwalledcarbonnanotubes(CNTs)weremade.Thediametersofthewell—alignedcarbonnanotubesweredistributedintherangeof60—120nuaandthelengthWasabout40m.TheCoparticlewith10n/nindiameterwasencapsul
6、atedintheCNTscompartment.Theproductswereobservedbyfieldemissionscanningelectronmicroscope(SEM),andtrans—missionelectronmicroscope(TEM).Thewell—alignedcarbonnanotubeswerecharacteriszedbyRamanscatteringspectrumandX—raydiffraction(XRD).Thecyclicvohammetricmeasure
7、mentdemonstratesthattheCNTshavesomeeffecttopreventthemetalnanoparficleencapsulatedfromerodingrapidly.ItisassumedthatthesmallamountoftheNelementintheCNTsisverynecessaryforthebamboo—likemorphologyandtheprotectedactionformetalparticlesagainstdissolutionintheacidm
8、edium.TheradianofthewindingwallshouldbeaffectedbytheamountoftheNandtheinteractionbetweentheNinthecarbonnetworkandthemetalcluster.Inaddition,theCNTsgreaterelectrochemicallyactivesur
