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Controlled Synthesis of Hollow Cu 2‐x Te Nanocrystals Based on the Kirkendall Effect and Their Enhanced CO Gas‐Sensing Properties
Author(s) -
Xiao Guanjun,
Zeng Yi,
Jiang Yueyue,
Ning Jiajia,
Zheng Weitao,
Liu Bingbing,
Chen Xiaodong,
Zou Guangtian,
Zou Bo
Publication year - 2013
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201202083
Subject(s) - kirkendall effect , materials science , nanocrystal , nanoparticle , carbon monoxide , chemical engineering , copper , nanostructure , transmission electron microscopy , nanotechnology , absorption (acoustics) , grain size , analytical chemistry (journal) , catalysis , composite material , metallurgy , chemistry , organic chemistry , engineering
This paper develops a facile solution‐based method to synthesize hollow Cu 2‐x Te nanocrystals (NCs) with tunable interior volume based on the Kirkendall effect. Transmission electron microscopy images and time‐dependent absorption spectra reveal the temporal growth process from solid copper nanoparticles to hollow Cu 2‐x Te NCs. Furthermore, the as‐prepared hollow Cu 2‐x Te NCs show enhanced sensitivity for the detection of carbon monoxide (CO), which is often referred to as the “silent killer”. The response and recovery time of the as‐prepared sensor for the detection of 100 ppm CO gas are estimated to be about 21 and 100 s, respectively, which are sufficient to render it a promising candidate for effective CO gas‐sensing applications. Such enhanced performance is achieved owing to the small grain size and large specific area of the hollow nanostructures. Therefore, the obtained hollow NCs based on the Kirkendall effect may have the potential as new functional blocks for high‐performance gas sensors.