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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Yu Zhao Yinhua Lei Wei Wang Zhihong Li |
| Copyright Year | 2008 |
| Description | Author affiliation: Inst. of Microelectron., Peking Univ., Beijing (Yu Zhao; Yinhua Lei; Wei Wang; Zhihong Li) |
| Abstract | 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. |
| Starting Page | 622 |
| Ending Page | 625 |
| File Size | 638496 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424419074 |
| DOI | 10.1109/NEMS.2008.4484409 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2008-01-06 |
| Publisher Place | China |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Microfluidics Nanobioscience Nanoparticles Microchannel Silicon Surface topography Electrostatics Cleaning Ethanol Fabrication nanoparticle monolayer chemical surface modification PDMS microfluidic |
| Content Type | Text |
| Resource Type | Article |
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