Gold nanoparticle networks with photoresponsive interparticle spacings

Deepti S. Sidhaye, Sudhir Kashyap, Murali Sastry, Srinivas Hotha, B. L.V. Prasad

Research output: Contribution to journalArticleResearchpeer-review

78 Citations (Scopus)

Abstract

Photoresponsive gold nanoparticle networks were prepared by functionalizing them with azobenzene derivatives. A network can be formed when a linker molecule constituting the azobenzene moiety suitably derivatized on either side with gold surface sensitive groups such as thiols and amines is added to the nanoparticle solution. It is shown that the interparticle spacing in the networks could be controlled by the reversible trans-cis isomerization of the azobenzene moiety induced by UV and visible light, respectively. The photoinduced variation in the interparticle spacings is inferred by the changes in the optical spectra of the gold nanoparticles which display a red or blue shift in the surface plasmon resonance peak depending on a decrease or increase in the interparticle spacing, respectively. Transmission electron microscopy images are in consonance with the evidence from the optical spectra.

Original languageEnglish
Pages (from-to)7979-7984
Number of pages6
JournalLangmuir
Volume21
Issue number17
DOIs
Publication statusPublished - 16 Aug 2005
Externally publishedYes

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