MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
In Situ Observation of Gold Chloride Decomposition in a Confined Nanospace by Transmission Electron Microscopy
Keita KobayashiRyo KitauraKatsuhiro SasakiKotaro KurodaTakeshi SaitoHisanori Shinohara
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2014 Volume 55 Issue 3 Pages 461-465

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Abstract

The behavior of gold chloride (AuClx) encapsulated within the inner space of a single-wall carbon nanotube (SWCNT) was investigated under electron beam (e-beam) irradiation and high temperatures. Analysis of the pristine specimen by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and Raman spectroscopy show that AuClx is encapsulated within the SWCNTs as a dilute disordered structure. In situ TEM observation of the specimen under e-beam irradiation shows that, within the SWCNTs, AuClx is reduced to a crystalline Au nanowire (AuNW). The AuNW drifts significantly within the SWCNT during the reduction. At high temperatures (>673 K), in situ TEM shows that the AuNW oscillates intermittently at a frequency of ∼1.1 s−1 and amplitude of ∼60 nm. Raman spectroscopy and EDX suggest that these phenomena are caused by an increase in the internal gas pressure in the SWCNTs because the decomposition of AuClx by e-beam irradiation or heat treatment produced chlorine (Cl2) gas.

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© 2013 The Japan Institute of Metals and Materials
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