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1、金纳米棒的生长动力学和长径比控制王雪飞1*，王营营1，赵玉云2，王卓2*（1中国科学院大学化学与化学学院，北京100049；2国家纳米科学中心，北京100190）种子法制备金纳米棒，粒子的长径比经历了先增大后减小的过程，这一过程不利于纳米棒形貌的控制。本文中，在优化生长液配比的前提下，通过改变种子用量有效地调节粒子的大小和长径比。动态监测发现，在粒子长径比的转折点处粒子的尺度并未受种子用量的改变而改变。根据化学动力学基本原理，我们模拟了这一生长过程，结果显示纳米粒子的形成遵循固定的生长轨迹，当原料耗尽时粒子生长结束，所有结束点均位于其生长轨迹上。这一结果为精确调控金纳米棒
2、的形貌提供实验和理论参考。关键词：金纳米棒；长径比；种子法；形貌控制；生长机制中图分类号：O647;O614GrowthdynamicsandAspectRatioTuningofGoldNanorodsWangXue-Fei*Correspondingauthors,WangXue-Fei,email:wangxf@ucas.ac.cnWangZhuo,email:zwang@nanoctr.cnTheprojectwassupportedbytheNationalScienceFoundation(21003139and91233107).国家自然科学基金(21003
3、139,91233107)资助。*WangYing-Ying1ZhaoYu-Yun2WangZhuo2*AbsctractForthegoldnanorodssynthesisbyseed-mediatedmethod,theovergrowthgoesagainsttheshapecontrollingforthefinalproduct.Here,throughoptimizingthegrowthsolutioncondition,thenanorodsshapecouldbetunedeffectivelybyjustadjustingtheseedamounti
4、ntroducedinitially.Further,thegrowth-stopexperimentrevealsthatthefinalnanorodswithdifferentshapeshaveasimilarsizeparameterattheirrespectiveturningpoints(TP)oftheovergrowthprocess,indicatingthatallnanorodsinsolutiongrowalongacommonmorphologyevolutiontrajectorybutterminateatdifferentpoints,
5、whichhavecertainaspectratio.Additionally,themorphologyevolutionofgoldnanorodscouldbesimulatedquantitativelyusingtheclassicchemicaldynamictheory,whichalsoopensapathwaytotunetheaspectratioofproductaccurately.Keywords:Goldnanorods;Aspectratio;Seedamount;Morphologytuning;Growthdynamics131Intr
6、oductionGoldnanorods,withavariablesurfaceplasmaresonancebandatvisiable/NIR,haveattractedmuchattentioninmanyfields,suchasthermaltherapy,1-3cellarimaging,4,5opticalpolarizer,6drugdelivery.7,8Advancedtootheranisotropicmetalnanoparticles,goldnanorodscanbesynthesizedinmassproductionjustbysimpl
7、echemicalreactionunderambientcondition,andthesurfaceplasmaresonancebandisvariable.9Eventhough,lotsofefforts,forexample,adjustingthereactantsconcentrations,9,10altersurfactant,11reshapingbyetching12orheating,12,13havebeenmadetooptimizethesynthesisprotocolbecauseofthe
