酞菁裂解法多壁碳納米管的制備、表征和應(yīng)用

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1、酞菁裂解法多壁碳納米管的制備、表征和應(yīng)用第17卷第6期2004年12月化學(xué)物理CHINESEJOURNALOFCHEMICALPHYSICSV01.17.No.6Dec.200410o3.7713/2004/06-767—8酞菁裂解法多壁碳納米管的制備,表征和應(yīng)用郭燕川.,謝文委,(a.中國科學(xué)院理化技術(shù)研究所,北京100101;陳麗娟.,彭必先"b.中國科學(xué)技術(shù)大學(xué)化學(xué)系,合肥230026)摘要:為了探究高溫處理酞菁鈷對O:的催化還原作用,以酞菁鈷作為催化劑的前體,通過化學(xué)氣相沉積的方法,在850下,氬氣與氫氣混

2、合氣流中,制備了雙層定向碳納米管,納米管的直徑分布在60～120nnl,長度約為40,在納米碳管中包裹有直徑為10Iun的鈷顆粒.所得產(chǎn)品用透射電子顯微鏡和掃描電子顯微鏡進(jìn)行了觀察,并用拉曼譜和x射線衍射對樣品進(jìn)行了表征.通過循環(huán)伏安法測量得到納米碳管對金屬顆粒在酸性溶液中的腐蝕具有一定抵抗作用.認(rèn)為少量的N對于竹節(jié)狀碳納米管的形成和金屬對酸的抵抗作用是十分必要的,每節(jié)中碳壁的彎曲弧度則與N在碳納米管中含量和N與金屬的相互作用有關(guān).另外,碳納米管較大的電化學(xué)活性區(qū)域在電化學(xué)方面具有潛在的應(yīng)用價(jià)值.關(guān)鍵詞:納米碳管;

3、化學(xué)蒸氣沉積;掃描電鏡中圖分類號(hào):O64文獻(xiàn)標(biāo)識(shí)碼: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