Controllable Two-Stage Droplet Evaporation Method and Its Nanoparticle Self-Assembly Mechanism

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	Controllable Two-Stage Droplet Evaporation Method and Its Nanoparticle Self-Assembly Mechanism
	Xie, Y ; Guo, SM ; Guo, CF ; He, M ; Chen, DX ; Ji, YL ; Chen, ZY ; Wu, XC ; Liu, Q ; Xie, SS
刊名	LANGMUIR
	2013
卷号	29 期号:21 页码:6232
ISSN号	0743-7463
通讯作者	Wu, XC (reprint author), CAS Key Lab Standardizat & Measurement Nanotechno, Beijing 100190, Peoples R China.
中文摘要	Bottom-up self-assembly is able to constitute a variety of structures and has been thought to be a promising way for advanced nanofabrication. Droplet evaporation, as the simplest method, has been used in various self-assemblies. However, the assembled area is not large enough and the order is still not well controlled. Here we show a facile and controllable two-stage droplet evaporation method by adjusting the humidity and temperature of the evaporating droplet. Taking the highly monodispersed gold nanorods (GNRs) as an example, large-area, self-assembly monolayer arrays are reproducibly achieved. To understand the self-assembly mechanism, we adopted simplified models to analyze the interactions between the nanorods. The results show that a metastable state of secondary-energy-minimum exists, especially in the latter stage of the assembly process, leading to the ordered arrays. A large electrostatic barrier between the assembled arrays prevents the formation of the multilayer structures and thereby leads to the preferential monolayers. Moreover, we predict possibilities of different types of assemblies of the nanorods, and a schematic phase diagram is finally given. The results here may offer a way toward high quality self assembled nanoparticles superlattices for use in enhanced spectroscopy, sensors, or nanodevices.
资助信息	NSFC [10974037, 61006078]; National Basic Research Programs of China [2010CB934102, 2011CB932802]; International S&T Cooperation Program [2010DFA51970]; Eu-FP7 Project [247644]
语种	英语
公开日期	2014-01-16
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/56841]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Xie, Y,Guo, SM,Guo, CF,et al. Controllable Two-Stage Droplet Evaporation Method and Its Nanoparticle Self-Assembly Mechanism[J]. LANGMUIR,2013,29(21):6232.
APA	Xie, Y.,Guo, SM.,Guo, CF.,He, M.,Chen, DX.,...&Xie, SS.(2013).Controllable Two-Stage Droplet Evaporation Method and Its Nanoparticle Self-Assembly Mechanism.LANGMUIR,29(21),6232.
MLA	Xie, Y,et al."Controllable Two-Stage Droplet Evaporation Method and Its Nanoparticle Self-Assembly Mechanism".LANGMUIR 29.21(2013):6232.