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不同能量的高电荷态Ar¹²⁺离子辐照对Au纳米颗粒尺寸的影响

Highly charged ion beam-induced size modification of Au nanoparticles

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【Author】 Xu Zhong-Feng1)2) Liu Li-Li1)Zhao Yong-Tao2)Chen Liang1)Zhu Jian1)Wang Yu-Yu2)Xiao Guo-Qing2)1)(Key Laboratory of Non-equilibrium Condensed Matter and Quantum Engineering of Ministry of Education,Department of Applied Physics,Xi’an Jiaotong University,Xi’an 710049,China)2)(Institute of Modern Physics,Chinese Academy of Sciences,Lanzhou 730000,China)

【机构】西安交通大学应用物理系,非平衡物质结构及量子调控教育部重点实验室；中国科学院近代物理研究所；

【摘要】报道了在兰州重离子加速器国家实验室电子回旋共振离子源原子物理实验平台上,在室温(293.15K)条件下,用固定剂量(4.3×1011/cm2)的高电荷态40Ar12+离子,辐照沉积在厚度为300nm的金膜表面上、平均直径约为35.3nm的Au纳米颗粒,使其大小发生改变的实验结果.实验中,通过改变入射离子的引出电压,选择不同的能量,利用原子力显微镜(AFM)对辐照前后颗粒的形态和大小进行表征,系统地研究了辐照后Au纳米颗粒的平均直径R与入射离子能量E的变化关系.同时利用碰撞混合模型、熟化(OR)和反熟化(IOR)模型对实验结果进行了详尽地定性讨论.实验和理论均表明:存在临界能量E*,当E<E*时,R随E的增大而增大,而当E>E*时,R随E的增大而减小.更多还原

【Abstract】 Size modification of Au nanoparticles(NPs),deposited on the Au-thick film surface,induced by highly charged ions(HCI)40Ar12+ with fixed low dose(4.3×1011 ions/cm2)but various energyies(ranged from 146.64keV to 290.64keV)at room temperature(293.15K),was investigated by atomic force microscopy(AFM)and transmission electron microscopy(TEM).The selected 40Ar12+ beams were provided by electron cyclotron resonance source(ECRIS)of the National Laboratory of the Heavy Ion Research Facility in Lanzhou(HIRFL).The morphological changes of NPs were interpreted by collisional mixing model,Ostwald ripening(OR)model and inverse Ostwald ripening(IOR)model of spherical NPs on a substrate.Theoretical and experimental studies both prove that there exist the critical energy E,for low ion energy(E<E),the mean diameter R of NPs increases with the increasing energy of incident ions E,while for higher projectile energy(E>E),it decreases with increasing energy.更多还原