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	Microfluidic patterning of close-packed nanoparticle monolayer
	Zhao, Yu ; Lei, Yinhua ; Wang, Wei ; Li, Zhihong
	2008
关键词	chemical surface modification PDMS microfluidic nanoparticle monolayer
英文摘要	Herein, a microfluidic-assisted dynamic assembly technique for close-packed nanoparticle monolayer patterning with high feature edge acuity and large-area uniformity is developed. Temporary PDMS microchannels are reversibly bonded to an oxidized silicon substrate whose surface is immobilized with 3-Aminopropyltriethoxysilane (APTES) to achieve a positive-potential surface. When the silica nanoparticle suspension flows through the microchannels, nanoparticles with a negative surface potential can be attracted onto the surface due to electrostatic attraction. Significantly, the shear force induced by the flow exerts a dual function: adjusting the first-layer nanoparticles to a uniform monolayer and cleaning up the excess nanoparticles above the first layer, which guarantees a monolayer. By tuning the substrate surface potential, the suspension concentration and the flow rate, a more close-packed nanoparticle monolayer can be achieved. Experimental results indicated that the best coverage obtained up to now is about 0.65. This work proposed a simple, versatile and cost-effective technique to pattern a close-packed nanoparticle monolayer out of cleanroom.; Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; EI; CPCI-S(ISTP); 0
语种	英语
DOI标识	10.1109/NEMS.2008.4484409
内容类型	其他
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/153421]
专题	信息科学技术学院
推荐引用方式 GB/T 7714	Zhao, Yu,Lei, Yinhua,Wang, Wei,et al. Microfluidic patterning of close-packed nanoparticle monolayer. 2008-01-01.

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