Shape and color of Au nanoparticles follow biocatalytic processes

Yi Xiao; Bella Shlyahovsky; Inna Popov; Valeri Pavlov; Itamar Willner

doi:10.1021/la050308+

Shape and color of Au nanoparticles follow biocatalytic processes

Yi Xiao, Bella Shlyahovsky, Inna Popov, Valeri Pavlov, Itamar Willner^*

^*Corresponding author for this work

Institute of Chemistry

Research output: Contribution to journal › Article › peer-review

73 Scopus citations

Abstract

The NAD(P)H-mediated growth of Au nanoparticles (NPs) in the presence of ascorbic acid, AuCl₄^-, and cetyltrimethylammonium bromide leads to the formation of shaped NP structures consisting of dipods, tripods, and tetrapods. The shaped particles exhibit a red-shifted plasmon absorbance at λ= 680 nm, consistent with the existence of a longitudinal plasmon exciton. High-resolution transmission electron microscopy analysis of the tripod and tetrapod structures reveals directional growth along the (211) and 〈010〉 directions, respectively. The shaped Au NPs could be generated by a biocatalytic process using alcohol dehydrogenase, NAD⁺, and ethanol, and the resulting blue color provides a colorimetric test for ethanol.

Original language	English
Pages (from-to)	5659-5662
Number of pages	4
Journal	Langmuir
Volume	21
Issue number	13
DOIs	https://doi.org/10.1021/la050308+
State	Published - 21 Jun 2005

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abstract = "The NAD(P)H-mediated growth of Au nanoparticles (NPs) in the presence of ascorbic acid, AuCl4-, and cetyltrimethylammonium bromide leads to the formation of shaped NP structures consisting of dipods, tripods, and tetrapods. The shaped particles exhibit a red-shifted plasmon absorbance at λ= 680 nm, consistent with the existence of a longitudinal plasmon exciton. High-resolution transmission electron microscopy analysis of the tripod and tetrapod structures reveals directional growth along the (211) and 〈010〉 directions, respectively. The shaped Au NPs could be generated by a biocatalytic process using alcohol dehydrogenase, NAD+, and ethanol, and the resulting blue color provides a colorimetric test for ethanol.",

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AU - Xiao, Yi

AU - Shlyahovsky, Bella

AU - Popov, Inna

AU - Pavlov, Valeri

AU - Willner, Itamar

PY - 2005/6/21

Y1 - 2005/6/21

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AB - The NAD(P)H-mediated growth of Au nanoparticles (NPs) in the presence of ascorbic acid, AuCl4-, and cetyltrimethylammonium bromide leads to the formation of shaped NP structures consisting of dipods, tripods, and tetrapods. The shaped particles exhibit a red-shifted plasmon absorbance at λ= 680 nm, consistent with the existence of a longitudinal plasmon exciton. High-resolution transmission electron microscopy analysis of the tripod and tetrapod structures reveals directional growth along the (211) and 〈010〉 directions, respectively. The shaped Au NPs could be generated by a biocatalytic process using alcohol dehydrogenase, NAD+, and ethanol, and the resulting blue color provides a colorimetric test for ethanol.

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Shape and color of Au nanoparticles follow biocatalytic processes

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