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Interfacial liquid-state surface-enhanced Raman spectroscopy

Author

Listed:
  • 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)

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.

Suggested Citation

  • Kihoon Kim & Hye Soo Han & Inhee Choi & Chiwon Lee & SoonGweon Hong & Sang-Hee Suh & Luke P. Lee & Taewook Kang, 2013. "Interfacial liquid-state surface-enhanced Raman spectroscopy," Nature Communications, Nature, vol. 4(1), pages 1-9, October.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms3182
    DOI: 10.1038/ncomms3182
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