Controlling the optical properties of lemongrass extract synthesized gold nanotriangles and potential application in infrared-absorbing optical coatings

TitleControlling the optical properties of lemongrass extract synthesized gold nanotriangles and potential application in infrared-absorbing optical coatings
Publication TypeJournal Article
Year of Publication2005
AuthorsShankar, SS, Rai, A, Ahmad, A, Sastry, M
JournalChemistry of Materials
Volume17
Issue3
Pagination566-572
Date PublishedFEB
Type of ArticleArticle
ISSN0897-4756
Abstract

Anisotropic metal nanoparticles have distinct optical behavior when compared with their spherical counterparts. In this report, we demonstrate a simple method involving the reduction of aqueous gold ions by the extract of the lemongrass plant leading to the formation of gold nanotriangles with interesting absorption in the near-infrared (NIR) region of the electromagnetic spectrum. We show that, by simple variation of the experimental conditions, it is possible to vary the size of the gold nanotriangles and, thus, to tune the absorbance of flat gold nanoparticles in the NIR region. The NIR absorption of the gold nanotriangles is expected to be of application in hyperthermia of cancer cells and in IR-absorbing optical coatings. We show that the lemongrass extract synthesized gold nanotriangles can be easily cast in the form of films on glass substrates and that these films are highly efficient in absorbing IR radiation for potential architectural applications.

DOI10.1021/cm048292g
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)9.407
Divison category: 
Biochemical Sciences
Physical and Materials Chemistry