Interfacial liquid-state surface-enhanced Raman spectroscopy

Kihoon Kim, Hye Soo Han, Inhee Choi, Chiwon Lee, SoonGweon Hong, Sang-Hee Suh, Luke P. Lee and Taewook Kang ()
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Kihoon Kim: Sogang University
Hye Soo Han: Sogang University
Inhee Choi: University of California at Berkeley
Chiwon Lee: Sogang University
SoonGweon Hong: University of California at Berkeley
Sang-Hee Suh: Electronic Materials Research Center, Korea Institute of Science and Technology
Luke P. Lee: University of California at Berkeley
Taewook Kang: Sogang University

Nature Communications, 2013, vol. 4, issue 1, 1-9

Abstract: Abstract Oriented assemblies of functional nanoparticles, with the aid of external physical and chemical driving forces, have been prepared on two-dimensional solid substrates. It is challengeable, however, to achieve three-dimensional assembly directly in solution, owing to thermal fluctuations and free diffusion. Here we describe the self-orientation of gold nanorods at an immiscible liquid interface (that is, oleic acid–water) and exploit this novel phenomenon to create a substrate-free interfacial liquid-state surface-enhanced Raman spectroscopy. Dark-field imaging and Raman scattering results reveal that gold nanorods spontaneously adopt a vertical orientation at an oleic acid–water interface in a stable trapping mode, which is in good agreement with simulation results. The spontaneous vertical alignment of gold nanorods at the interface allows one to accomplish significant additional amplification of the Raman signal, which is up to three to four orders of magnitude higher than that from a solution of randomly oriented gold nanorods.

Date: 2013
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DOI: 10.1038/ncomms3182

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