Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.

Growth of gold nanorods (AuNRs) by photochemical reduction of HAuCl4 in a micelle solution of hexadecyltrimethylammonium bromide (CTAB) and tetraoctylammonium bromide (TOAB) is studied. The effects of 300 and 254 nm UV light sources and their photon flux on the anisotropic growth of gold nanoparticles are investigated by controlling duration of irradiation and the number of lamps within a photochemical reactor. The resulting AuNRs were characterized by absorption spectroscopy, FTIR, and TEM. Experimental results indicate that a higher density of longer colloidal AuNRs form by increasing the number of incident photons (lamps) at 300 nm while the 254 nm lights produce a lower yield of shorter AuNRs. The yield of AuNRs also depends on the duration of irradiation which was found to be 6.00 h for 300 nm and 5.00 h for 254 nm radiation. Acetone is found to play a major role in the synthesis of AuNRs. Two mechanisms are proposed for the synthesis of Au nanoparticles in the presence and absence of acetone. Irradiation of samples for an excess time produces a lower concentration of AuNRs and a higher yield of spherical particles. This effect is attributed to atom-by-atom dissolution of AuNRs into Au-spherical particles.

Main Author: Miranda, Oscar R.
Other Authors: Ahmadi, Temer S.
Format: Villanova Faculty Authorship
Language: English
Published: 2005
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dc_source_str_mv The Journal of Physical Chemistry B 109(33), July 30, 2005, 15724-15734.
author Miranda, Oscar R.
author_facet_str_mv Miranda, Oscar R.
Ahmadi, Temer S.
author_or_contributor_facet_str_mv Miranda, Oscar R.
Ahmadi, Temer S.
author_s Miranda, Oscar R.
spellingShingle Miranda, Oscar R.
Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
author-letter Miranda, Oscar R.
author_sort_str Miranda, Oscar R.
author2 Ahmadi, Temer S.
author2Str Ahmadi, Temer S.
dc_title_str Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
title Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
title_short Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
title_full Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
title_fullStr Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
title_full_unstemmed Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
collection_title_sort_str effects of intensity and energy of cw uv light on the growth of gold nanorods.
title_sort effects of intensity and energy of cw uv light on the growth of gold nanorods.
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description Growth of gold nanorods (AuNRs) by photochemical reduction of HAuCl4 in a micelle solution of hexadecyltrimethylammonium bromide (CTAB) and tetraoctylammonium bromide (TOAB) is studied. The effects of 300 and 254 nm UV light sources and their photon flux on the anisotropic growth of gold nanoparticles are investigated by controlling duration of irradiation and the number of lamps within a photochemical reactor. The resulting AuNRs were characterized by absorption spectroscopy, FTIR, and TEM. Experimental results indicate that a higher density of longer colloidal AuNRs form by increasing the number of incident photons (lamps) at 300 nm while the 254 nm lights produce a lower yield of shorter AuNRs. The yield of AuNRs also depends on the duration of irradiation which was found to be 6.00 h for 300 nm and 5.00 h for 254 nm radiation. Acetone is found to play a major role in the synthesis of AuNRs. Two mechanisms are proposed for the synthesis of Au nanoparticles in the presence and absence of acetone. Irradiation of samples for an excess time produces a lower concentration of AuNRs and a higher yield of spherical particles. This effect is attributed to atom-by-atom dissolution of AuNRs into Au-spherical particles.
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dc.title Effects of Intensity and Energy of CW UV Light on the Growth of Gold Nanorods.
dc.creator Miranda, Oscar R.
Ahmadi, Temer S.
dc.description Growth of gold nanorods (AuNRs) by photochemical reduction of HAuCl4 in a micelle solution of hexadecyltrimethylammonium bromide (CTAB) and tetraoctylammonium bromide (TOAB) is studied. The effects of 300 and 254 nm UV light sources and their photon flux on the anisotropic growth of gold nanoparticles are investigated by controlling duration of irradiation and the number of lamps within a photochemical reactor. The resulting AuNRs were characterized by absorption spectroscopy, FTIR, and TEM. Experimental results indicate that a higher density of longer colloidal AuNRs form by increasing the number of incident photons (lamps) at 300 nm while the 254 nm lights produce a lower yield of shorter AuNRs. The yield of AuNRs also depends on the duration of irradiation which was found to be 6.00 h for 300 nm and 5.00 h for 254 nm radiation. Acetone is found to play a major role in the synthesis of AuNRs. Two mechanisms are proposed for the synthesis of Au nanoparticles in the presence and absence of acetone. Irradiation of samples for an excess time produces a lower concentration of AuNRs and a higher yield of spherical particles. This effect is attributed to atom-by-atom dissolution of AuNRs into Au-spherical particles.
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