Three-dimensional reduced-symmetry of colloidal plasmonic nanoparticles

Eunhye Jeong, Kihoon Kim, Inhee Choi, Sunil Jeong, Younggeun Park, Hyunjoo Lee, Soo Hong Kim, Luke P. Lee, Yeonho Choi, Taewook Kang

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Owing to their novel optical properties, three-dimensional plasmonic nanostructures with reduced symmetry such as a nanocrescent and a nanocup have attracted considerable current interest in biophotonic imaging and sensing. However, their practical applications have been still limited since the colloidal synthesis of such structures that allows, in principle, for in vivo application and large-scale production has not been explored yet. To date, these structures have been fabricated only on two-dimensional substrates using micro/nanofabrication techniques. Here we demonstrate an innovative way of breaking symmetry of colloidal plasmonic nanoparticles. Our strategy exploits the direct overgrowth of Au on a hybrid colloidal dimer consisting of Au and polystyrene (PS) nanoparticles without the self-nucleation of Au in an aqueous solution. Upon the overgrowth reaction, the steric crowding of PS leads to morphological evolution of the Au part in the dimer ranging from half-shell, nanocrescent to nanoshell associated with the appearance of the second plasmon absorption band in near IR. Surface-enhanced Raman scattering signal is obtained directly from the symmetry-broken nanoparticles solution as an example showing the viability of the present approach. We believe our concept represents an important step toward a wide range of biophotonic applications for optical nanoplasmonics such as targeting, sensing/imaging, gene delivery, and optical gene regulations.

Original languageEnglish
Pages (from-to)2436-2440
Number of pages5
JournalNano Letters
Issue number5
StatePublished - 9 May 2012


  • Colloidal plasmonic nanoparticle
  • colloidal synthesis
  • hybrid nanoparticles
  • reduced symmetry
  • selective overgrowth
  • surface-enhanced Raman scattering


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