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Photochemical synthesis: Effect of UV irradiation on gold nanorods morphology

Paper ID Volume ID Publish Year Pages File Format Full-Text
26306 43946 2014 5 PDF Available
Title
Photochemical synthesis: Effect of UV irradiation on gold nanorods morphology
Abstract

•We investigate the role of the different irradiation parameters in the photochemical synthesis of gold nanorods.•The irradiance used in the photochemical process is found to influence primarily the nucleation stage of the synthesis of the gold nanorods.•The control of the time of irradiation allows to follow the growth of the gold nanorods, till the precursor is finished trough photoreduction.

Gold nanorods (AuNRs) were synthesized by photochemical method, through irradiation of a reaction solution, containing gold precursor, surfactant and a mild reducing agent to speed up the process. The effects of the irradiation parameters on the morphology of the formed AuNRs were investigated by UV–Vis absorption spectra and transmission electron microscopy. Specifically, the control of the UV irradiance (irradiation power per unit area) and irradiation time allowed the preparation of AuNRs with a wide range of sizes. Increase of the irradiation power leads to the formation of smaller AuNRs, with concomitant decrease of length and diameter. Since both axes show a simultaneous size decrease, the produced AuNRs have increased aspect ratio. Overall we show that application of high UV irradiance for short times favors the synthesis of small AuNRs with increased anisotropy. We propose that the rise of the irradiation power primarily accelerates the reduction of the gold precursor, promoting in such way the formation of smaller seeds. Short irradiation times guard against dissolution effects on the formed nanorods.

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Keywords
Gold nanorods; Photochemical synthesis; Nucleation; Anisotropic growth
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 275, 1 February 2014, Pages 7–11
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us