期刊
NANO LETTERS
卷 9, 期 8, 页码 2921-2925出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl901239a
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资金
- DARPA SERS ST Fundamentals [FA9550-08-1-0257]
- National Institutes of Health [PN2 EY018228]
- Lawrence Livermore National Laboratory
We introduce NanoPen, a novel technique for low optical power intensity, flexible, real-time reconfigurable, and large-scale light-actuated patterning of single or multiple nanoparticles, such as metallic spherical nanocrystals, and one-dimensional nanostructures, such as carbon nanotubes. NanoPen is capable of dynamically patterning nanoparticles over an area of thousands of square micrometers with light intensities <10 W/cm(2) (using a commercial projector) within seconds. Various arbitrary nanoparticle patterns and arrays (including a 10 x 10 array covering a 0.025 mm(2) area) are demonstrated using this capability. One application of NanoPen is presented through the creation of surface-enhanced Raman spectroscopy hot-spots by patterning gold nanoparticles of 90 nm diameter with enhancement factors exceeding 10(7) and picomolar concentration sensitivities.
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