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A study on surfactant-free growth of silver-carbon nanocables by H2SO4-mediated hydrothermal process

Published online by Cambridge University Press:  25 August 2011

HeLin Niu*
Affiliation:
Department of Chemistry, Anhui University, Hefei 230039, China
XuHu Wu
Affiliation:
Department of Chemistry, Anhui University, Hefei 230039, China
Min Qiu
Affiliation:
Department of Chemistry, Anhui University, Hefei 230039, China
YuanHao Gao
Affiliation:
Department of Chemistry, Anhui University, Hefei 230039, China
JiMing Song
Affiliation:
Department of Chemistry, Anhui University, Hefei 230039, China
ChangJie Mao
Affiliation:
Department of Chemistry, Anhui University, Hefei 230039, China
ShengYi Zhang
Affiliation:
Department of Chemistry, Anhui University, Hefei 230039, China
HongLing Liu
Affiliation:
Institute of Molecular and Crystal Engineering, School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
JunHua Wu*
Affiliation:
Pioneer Research Center for Biomedical Nanocrystals, Korea University, Seongbuk-Gu, Seoul 136-713, Korea
*
a)Address all correspondence to these authors. e-mail: [email protected]
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Abstract

We study the one-pot facile hydrothermal growth of ultralong silver–carbon (Ag–C) nanocables with Ag nanowires as the cores and carbon as the sheaths through the mediation of H2SO4 and without using an organic surfactant. In the investigation, Ag–C nanostructures were systematically and extensively examined as a function of both temperature and H2SO4 concentration to locate the optimal conditions for preparing ultralong, robust, and uniform Ag–C coaxial nanocables at T = 180 °C and 0.5 M H2SO4. The characterization clearly demonstrated a simple, efficient, and surfactant-free synthesis of Ag–C nanocables. In the hydrothermal process, glycerol acts as both reducing agent and carbon source, while H2SO4 mediates the directional growth of the silver nanowire core and assists the deposition of carbon. Moreover, the nanocables manifest unusual ferromagnetism at room temperature and a plausible mechanism of forming Ag–C nanocables was proposed as a result of the chain-like hydrogen sulfate compounds owing to the H2SO4 mediation.

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Articles
Copyright
Copyright © Materials Research Society 2011

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