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1、第l9卷第1l期中國(guó)有色金屬學(xué)報(bào)2009年l1月、,0I_19No11TheChineseJournalofNonferrousMetalsNOV.2009文章編號(hào):1004.0609(2009)11-2038.06直流電弧等離子體制備NiO包覆Ni納米顆粒魏智強(qiáng),2汪寶珍,閏曉燕,朱林,楊曉紅,閆鵬勛3(1.蘭州理工大學(xué)理學(xué)院,蘭州730050;2.蘭州理工大學(xué)甘肅省有色金屬新材料省部國(guó)家重點(diǎn)實(shí)驗(yàn)室,蘭州730050;3.蘭州大學(xué)物理科學(xué)與技術(shù)學(xué)院,蘭州730000)摘要:采用直流電弧等離子體技術(shù)制備NiO包
2、覆Ni納米顆粒,對(duì)初產(chǎn)物經(jīng)過鈍化處理得到有氧化膜保護(hù)的NiO包覆Ni納米顆粒。采用高分辨透射電子顯微鏡(HRTEM)、X射線衍射(XRD)、透射電子顯微鏡(TEM)、。選區(qū)電子衍射(SAED)、熱重和差示掃描量熱分析儀(TGA/DSC)以及傅里葉變換紅外光譜(FTIR)等手段對(duì)試樣的成分、表面組成、形貌、晶體結(jié)構(gòu)、粒度、紅外吸收性能和氧化特性進(jìn)行了分析。結(jié)果表明:經(jīng)過表面鈍化處理的NiO包覆Ni納米顆粒具有明顯的核一殼結(jié)構(gòu),內(nèi)核為納米Ni,外殼為NiO氧化物;顆粒呈球形,粒度均勻,分散性良好,粒徑分布在2O~7
3、0nm范圍,平均粒徑為44ntn,殼層氧化膜的厚度為5-8nm;殼核結(jié)構(gòu)可防止納米Ni顆粒的進(jìn)一步氧化和團(tuán)聚,且使紅外吸收峰發(fā)生藍(lán)移。關(guān)鍵詞:NiO包覆;納米顆粒:核一殼結(jié)構(gòu);鈍化;氧化特性中圖分類號(hào):TB383文獻(xiàn)標(biāo)識(shí)碼:APreparationofNiOencapsulatedNinanoparticlesbydirectcurrentarcplasmamethodWEIZhi.qiang,,WANGBao.zhen,YANXiao.yan,ZHULin,YANGXiao。hong,YANPeng.xun(
4、1.SchoolofScience,LanzhouUniversityofTechnology,Lanzhou730050,China;2.StateKeyLaboratoryofGansuAdvancedNewNon—ferrousMaterials,LanzhouUniversityofTechnology,Lanzhou730050,China;3.SchoolofPhysicalScienceandTechnology,LanzhouUniversity,Lanzhou730000,China)Abst
5、ract:TheNiOencapsulatedNinanoparticleswerepreparedbydirectc~rrent【DC)arcplasmamethodandsubsequentlypassivation.Thechemicalcomposition,morphology,crysmlmicrostructure,particlesize,infraredspectrapropertiesandoxidizationresistanceoftheproductwereanalyzedusingt
6、hehigh—resolutiontransmissionelectronmicroscopy(HRTEM),X—raydifractometry(xao),transmissionelectronmicroscopy(TEM),corespondingselected—areaelectrondifractometry(SAED),thermogravimetricanalyzer(TGA)diferentialscanningcalorimeter(DSC)andFouriertransforminfrar
7、edspectrum(FTIR).TheresultsshowthattheNiOencapsulatedNinanoparticleshaveclearcore—shellstructure.ThecoreconsistsofNiparticles,whiletheshellconsistsofNiO.Thesamplesarehomogeneouslydistributedwithsphericalshapeandwelldispersed,theparticlesizesdistributefrom20t
8、o70nmwithaverageparticlesizeofabout44nln,andthethicknessoftheshellis5-8rh-n.Thecore.shellstructurecanpreventNinanopartictesfromoxidationandagglomeration,andtheinfraredabsorptionbandshowblue—shif