Controlled organization of au colloids into linear assemblies

Ziyi Zhong; Jizhong Luo; Thiam Peng Ang; James Highfield; Jianyi Lin; Aharon Gedanken

doi:10.1021/jp047683f

Controlled organization of au colloids into linear assemblies

Ziyi Zhong^*, Jizhong Luo, Thiam Peng Ang, James Highfield, Jianyi Lin, Aharon Gedanken

^*Corresponding author for this work

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

71 Scopus citations

Abstract

A simple and convenient method is described to produce gold nanowires. A controlled organization of Au colloids into linear assemblies was achieved without using any templates. HAuCl ₄ was reduced by NaBH ₄ in the presence of lysine to act as capping and bridging agent. At a molar ratio of Au/Lys = 1:0.5 and pH in the range 8.4-9.5, linear aggregates of Au can be prepared with a diameter of ca. 5 nm and variable lengths in the range of 80-200 nm. At lower or higher pH values, there is no control on the unidirectional growth of linear aggregates. Application of ultrasound during the preparation also impairs linear growth or disrupts the chain structure, yielding discrete colloidal particles of Au as sole product. The key factor for formation of Au linear assemblies is believed to be a subtle balance between the attractive (cross-linking) force, provided by lysine molecules, working against the electrostatic repulsion among Au colloid surfaces bearing like (negative) charges.

Original language	English
Pages (from-to)	18119-18123
Number of pages	5
Journal	Journal of Physical Chemistry B
Volume	108
Issue number	47
DOIs	https://doi.org/10.1021/jp047683f
State	Published - 25 Nov 2004
Externally published	Yes

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title = "Controlled organization of au colloids into linear assemblies",

abstract = "A simple and convenient method is described to produce gold nanowires. A controlled organization of Au colloids into linear assemblies was achieved without using any templates. HAuCl 4 was reduced by NaBH 4 in the presence of lysine to act as capping and bridging agent. At a molar ratio of Au/Lys = 1:0.5 and pH in the range 8.4-9.5, linear aggregates of Au can be prepared with a diameter of ca. 5 nm and variable lengths in the range of 80-200 nm. At lower or higher pH values, there is no control on the unidirectional growth of linear aggregates. Application of ultrasound during the preparation also impairs linear growth or disrupts the chain structure, yielding discrete colloidal particles of Au as sole product. The key factor for formation of Au linear assemblies is believed to be a subtle balance between the attractive (cross-linking) force, provided by lysine molecules, working against the electrostatic repulsion among Au colloid surfaces bearing like (negative) charges.",

author = "Ziyi Zhong and Jizhong Luo and Ang, {Thiam Peng} and James Highfield and Jianyi Lin and Aharon Gedanken",

year = "2004",

month = nov,

day = "25",

doi = "10.1021/jp047683f",

language = "英语",

volume = "108",

pages = "18119--18123",

journal = "Journal of Physical Chemistry B",

issn = "1520-6106",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Controlled organization of au colloids into linear assemblies

AU - Zhong, Ziyi

AU - Luo, Jizhong

AU - Ang, Thiam Peng

AU - Highfield, James

AU - Lin, Jianyi

AU - Gedanken, Aharon

PY - 2004/11/25

Y1 - 2004/11/25

N2 - A simple and convenient method is described to produce gold nanowires. A controlled organization of Au colloids into linear assemblies was achieved without using any templates. HAuCl 4 was reduced by NaBH 4 in the presence of lysine to act as capping and bridging agent. At a molar ratio of Au/Lys = 1:0.5 and pH in the range 8.4-9.5, linear aggregates of Au can be prepared with a diameter of ca. 5 nm and variable lengths in the range of 80-200 nm. At lower or higher pH values, there is no control on the unidirectional growth of linear aggregates. Application of ultrasound during the preparation also impairs linear growth or disrupts the chain structure, yielding discrete colloidal particles of Au as sole product. The key factor for formation of Au linear assemblies is believed to be a subtle balance between the attractive (cross-linking) force, provided by lysine molecules, working against the electrostatic repulsion among Au colloid surfaces bearing like (negative) charges.

AB - A simple and convenient method is described to produce gold nanowires. A controlled organization of Au colloids into linear assemblies was achieved without using any templates. HAuCl 4 was reduced by NaBH 4 in the presence of lysine to act as capping and bridging agent. At a molar ratio of Au/Lys = 1:0.5 and pH in the range 8.4-9.5, linear aggregates of Au can be prepared with a diameter of ca. 5 nm and variable lengths in the range of 80-200 nm. At lower or higher pH values, there is no control on the unidirectional growth of linear aggregates. Application of ultrasound during the preparation also impairs linear growth or disrupts the chain structure, yielding discrete colloidal particles of Au as sole product. The key factor for formation of Au linear assemblies is believed to be a subtle balance between the attractive (cross-linking) force, provided by lysine molecules, working against the electrostatic repulsion among Au colloid surfaces bearing like (negative) charges.

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U2 - 10.1021/jp047683f

DO - 10.1021/jp047683f

M3 - 文章

AN - SCOPUS:10044228539

SN - 1520-6106

VL - 108

SP - 18119

EP - 18123

JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 47

ER -

Controlled organization of au colloids into linear assemblies

Abstract

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