Interfacial liquid-state surface-enhanced Raman spectroscopy

Title
Interfacial liquid-state surface-enhanced Raman spectroscopy
Authors
Kihoon KimHye Soo HanInhee ChoiSoonGweon Hong서상희Luke P. LeeTaewook Kang
Keywords
SERS; Interfacial; Liquid-state; Gold nano rods
Issue Date
2013-07
Publisher
Nature Communications
Citation
VOL 4, 2182-1-2182-9
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.
URI
http://pubs.kist.re.kr/handle/201004/46026
ISSN
20411723
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