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[校内新闻] stevens理工在微纳米工艺领域取得重大突破!

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发表于 2013-3-9 12:34:47 |显示全部楼层

最新研究成果被advances in engineering报道:
http://advanceseng.com/mechanica ... aphic-nanopatterns/

Wafer-scale lightweight, stretchable and bendable plasmonic nanostructures that can be used for highly sensitive structural detection of low concentration analytes are boosting prospects of in-situ biomedical detection. Recently, such materials have been developed by the research group of Prof. Choi at the Stevens Institute of Technology and published in the journal of ACS Applied Materials & Interfaces [1].  Many groups have been working on the development of efficient ways to fabricate uniform arrays of nanoscale features based on noble metals such as gold and silver in a large area (up to several inches) for the applications to plasmonic sensing. However, most of these efforts were limited by the high cost and low throughput of the fabrication process such as electron-beam lithography or focused ion beam lithography. So far, none of these is recognized as efficient for wafer-scale nanopatterning techniques. By contrast, researchers at Prof. Choi’s group, including Mr. Ke Du, Mr. Ishan Wathuthanthri, Dr. Yuyang Liu, and Dr. Wei  Xu, have made groundbreaking advances by using laser interference lithography to create uniform polymer nanoarrays on a polished silicon substrate [2-4]. The nanopatterns defined by the laser inteference lithography are then used as template for the direct deposition and transfer of a nanopatterned metal film onto various substrate materials [1, 5]. Metal layer was uniformly deposited on the polymer template so that the reversed nanopatterns were transferred to the deposited metal surface. Polydimethylsiloxane (PDMS), one type of flexible, transparent and bio-compatible polymer was then directly molded and cured on the metal film to transfer the metallic nanopatterns onto the PDMS by mechanically peeling the nanopatterned metal film off from the initial silicon substrate. By using this technique, nanowell and nanograting patterns can be easily created on PDMS substrate. One of the key advantages of the technique is that the pattern periodicity and shapes of the nanostructures can be easily tuned by simply modulating the incident angle of the laser interference lithography system. The development of these highly flexible metal nanostructures on PDMS substrate, which cover a large area, is of great significance in flexible plasmonic sensors for probing chemical species in a wide range of fields down to single molecule level.


References

K. Du, I. Wathuthanthri, Y. Liu, W. Xu, C.-H. Choi,“Wafer-Scale Pattern Transfer of Metal Nanostructures on Polydimethylsiloxane (PDMS) Substrates via Holographic Nanopatterns”, ACS Applied Materials & Interfaces 4, 5505-5514 (2012).

I. Wathuthanthri, W. Mao, C.-H. Choi,“Two Degrees-of-Freedom Lloyd-Mirror Interferometer for Superior Pattern Coverage Area”, Optics Letters36, 1593-1595 (2011).

W. Mao, I. Wathuthanthri, C.-H. Choi,“Tunable Two-Mirror Interference Lithography System for Wafer-Scale Nanopatterning”, Optics Letters36, 3176-3178 (2011).

I. Wathuthanthri, Y. Liu, K. Du, W. Xu, C.-H. Choi,“Simple Holographic Patterning for High-Aspect-Ratio Three-Dimensional Nanostructures with Large Coverage Area”,Advanced Functional Materials23, 608-618 (2013).

K. Du, I. Wathuthanthri, W. Mao, W. Xu, C.-H. Choi, “Large-Area Pattern Transfer of Metallic Nanostructures on Glass Substrates via Interference Lithography”,Nanotechnology22, 285306 (2011).



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发表于 2013-3-9 12:37:48 |显示全部楼层
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材料领域发展空间很大啊!早上我也看到一个超级防水材料的介绍,有想法搞科研的应该坚决读博
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