Biosensors: Plasmons spring into action

Research output: Contribution to journalArticlepeer-review


The integration of semiconducting nanowires and metallic nanoparticles in a single device leads to a biosensor with enhanced sensitivity that detects molecules over a broad range of concentrations. These biosensors are based on plasmon-exciton interaction, in which CdTe nanowires are functionalized with polyethylene glycol molecules (springs) and gold nanospheres. The excitons are quantum confined in nanoparticles of 1-10nm size and their binding energy becomes size-dependent. The excitons attach molecular springs to the nanowires, to the end of which the gold nanoparticles are appended. The emission of the CdTe nanowires, with gold nanospheres on the short spring length is blue-shifted compared with the CdTe nanowires without gold nanoparticles. The requirement of this biosensor would be to do proper chemistry to link the two types of nanoparticles so that large conformational change occur on binding a molecule.

Original languageEnglish (US)
Pages (from-to)259-260
Number of pages2
JournalNature Materials
Issue number4
StatePublished - Apr 2007
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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