Synthesis,morphologyandmagneticpropertiesof graphite-encapsulatednickelnanoparticles
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摘要: 在密闭容器中,用爆轰分解掺杂含有镍离子的混合炸药前驱体合成了核壳结构石墨包覆镍纳米颗 粒。调整混合炸药前驱体中碳源材料和金属源材料的有效摩尔比合成了球形、不同尺寸、核壳结构的磁性石 墨包覆纳米镍颗粒。采用X 射线衍射仪(XRD)、透射电镜(TEM)、能谱分析仪(EDX)和振动样品磁强计 (VSM)表征化学构成、结构形貌及磁性能。结果表明:颗粒大小主要分布在10~55nm 之间,复合纳米颗粒 主要由面心立方镍纳米晶体和石墨碳构成,常温下这些复合纳米颗粒主要表现出超顺磁性和铁磁性能。Abstract: Aimedatsynthesizingtheencapsulationofnickelnanocrystalwithingraphiticcarbon,effectiveexperimentswerecarriedoutbyadjustingthemoleratioofcarbonsourceandmetalsourcein theseprecursors.Thechemicalcomposition,nanostructuresandmagneticpropertiesofthecomposite particleswereanalyzedbyusingX-raydiffraction(XRD),transmissionelectronmicroscopy(TEM), energydispersiveX-raydetector (EDX)andvibratingsamplemagnetometer (VSM).Theresults showedthatthedifferentsizeandsphericalgraphite-encapsulatednickelnanoparticleswithaperfect core-shellstructurehadbeenpreparedandthatthesemagneticcompositeparticlesmainlydistributed in10-55nm.Themagneticmeasurementsdemonstratedthattheas-preparedCENNPstookonsuperparamagneticorferromagneticbehaviorsatroomtemperature.
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