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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kim K,Han HS,Choi I,Lee C,Hong S,Suh SH,Lee LP,Kang Tdoi
10.1038/ncomms3182subject
Has Abstractpub_date
2013-01-01 00:00:00pages
2182issn
2041-1723pii
ncomms3182journal_volume
4pub_type
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