Kim, Kihoon Han, Hye Soo Choi, Inhee Lee, Chiwon Hong, SoonGweon Suh, Sang-Hee Lee, Luke P. Kang, Taewook 2024-01-20T12:02:57Z 2024-01-20T12:02:57Z 2021-09-05 2013-07 2041-1723 https://pubs.kist.re.kr/handle/201004/127920 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. English NATURE PUBLISHING GROUP GOLD NANORODS NANOPARTICLES ORIENTATION SHAPE SERS RESONANCE Interfacial liquid-state surface-enhanced Raman spectroscopy Article 10.1038/ncomms3182 1 NATURE COMMUNICATIONS, v.4 NATURE COMMUNICATIONS 4 scie scopus 000323716600018 2-s2.0-84887014084 Multidisciplinary Sciences Science & Technology - Other Topics Article GOLD NANORODS NANOPARTICLES ORIENTATION SHAPE SERS RESONANCE SERS Interfacial Liquid-state Gold nano rods