Method of fabricating arrays of metal nanoparticles on graphene templete by selectively deposition and surface enhanced Raman scattering based sensors made thereof
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Title of Invention |
Method of fabricating arrays of metal nanoparticles on graphene templete by selectively deposition and surface enhanced Raman scattering based sensors made thereof |
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Technology
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Thanking to improvements in micro fabrication and integration, optical spectrometers have been miniaturized to become portable devices or small modules. However, the sensitivity and identification abilities are still limited for very low concentration of probe molecules. By increasing laser power the sensitivity of detection can be improved. But, laser induced damages to biomolecules and high costs are concerned. Surface Enhanced Raman Scattering is a promising method of enhancing the Raman scattering based detection and identification of probe molecules by means of laser illumination induced Raman scattering which is enhanced by plasmonic coupling. The enhancements include both electromagnetic mechanisms and chemical mechisms. The state-of-the-art SERS technology employing expensive thin film technology leads to less affordable SERS sensors. SERS made on glass plates are not flexible. The enhancement of Raman scattering signal strength is not sufficient. This invention applies unique properties of graphene synthsis processes and selective silver and gold deposition techniques to fabricate novel silver and gold nanostructures embedded in graphene nanostructures and demonstrate inexpensive, high-sensitivity, and flexible SERS substrates with very high enhancement factors, such as 1014 times, allowing the detection of very low concentration of molecules. The invention is expectd to be useful for food security, biomedicine sensing, environmental monitoring. |
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Benefits |
This invention avoids the use of expensive lithographic processes and non-optimized porous templates for producing silver or gold nanostructures as SERS substrates. Silver and gold nanostructures are inexpensively and rapidly formed on a flexible copper film or foil using high-density graphene nuclei and graphene nano-domains with desired shapes as blocking templates while retaining the chemical Raman enhancement and florescence quenching capabilities of graphene nanostructures surrounding closely spaced and properly shaped silver and gold nanoparticles, nanodomains, and nanostructures. Excellent Raman enhancement factor on the order of 1014 times has thus been demonstrated for detection and identification of very low concentration or a small number of molecules, which exhibit unique Raman scattering spectra. |
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Possible Applications/ Industry Categories |
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Contact Information |
Technology Transfer and Business Incubation Center, NCKU Contact person：Yi-Yin, Lin E-mail：ainlin@mail.ncku.edu.tw |