球形银纳米粒子的微波法制备和表征及其光谱特性研究.docx

球形银纳米粒子的微波法制备和表征及其光谱特性研究
摘要
本文探讨了一种微波法制备球形银纳米粒子的方法，并对其进行了表征和光谱特性研究。实验结果表明，所制备的银纳米粒子呈球形，平均粒径约为50nm，表面光滑，分散性良好。此外，研究了其吸收特性及表面等离子共振峰位，发现其表现出良好的峰位及吸收效果，因而具有广泛的应用前景。
Abstract
Thispaperdiscussesamicrowave-assistedmethodforpreparingsphericalsilvernanoparticles,includingtheircharacterizationandspectralproperties.Theresultsoftheexperimentshowedthatthesilvernanoparticlesproducedwerespherical,withanaverageparticlesizeofapproximately50nm,andhadasmoothsurfaceandgooddispersion.Furthermore,theabsorptioncharacteristicsandsurfaceplasmonresonancepeakwerestudied,andtheresultsshowedthatthenanoparticlesexhibitedexcellentpeakpositionsandabsorptioneffects,makingitapromisingmaterialforawiderangeofapplications.
Introduction
Inrecentyears,nanotechnologyhasmadegreatstrides,givingrisetoawealthofresearchinthefieldsofphysics,chemistry,andbiology.Inparticular,theuseofnanomaterialshasbecomeincreasinglypopularduetotheiruniquephysical,chemical,andbiologicalproperties.Amongthesematerials,silvernanoparticleshaveattractedmuchattentionduetotheirexcellentopticalandelectricalproperties,makingthemidealforuseinthefieldsofelectronics,sensors,andbiomedicine.
Therearevariousmethodsforsynthesizingsilvernanoparticles,includingchemicalreduction,photochemicalreduction,electrochemicalmethods,andmicrowave-assistedmethods.Microwave-assistedmethodshavegainedincreasingattentionduetotheirrapidsynthesis,simplepreparation,andhighyield.Inthisstudy,amicrowave-assistedmethodwasadoptedtosynthesizesphericalsilvernanoparticles,andtheirphysicalandopticalpropertieswerecharacterizedandstudied.
Experimentalsection
Tosynthesizethesilvernanoparticles,silvernitrate(AgNO3,99.9%)andsodiumborohydride(NaBH4,99%)wereusedastheprecursorandreductant,respectively.Themicrowave-assistedmethodinvolvedheatingasolutioncontaining10mlofAgNO3(2mM)and10mlofNaBH4(4mM)inadomesticmicrowaveovenfor5min.Thereactionwasthencooledtoroomtemperature,andtheresultingnanoparticlesolutionwascentrifugedat12000rpmfor10mintoremoveimpurities.Theresultingsolutionwasthendi