Growth behavior and sensing properties of nanograins in CuO nanofibers

Sun Woo Choi; Jae Young Park; Sang Sub Kim

doi:10.1016/j.cej.2011.05.100

Growth behavior and sensing properties of nanograins in CuO nanofibers

Sun Woo Choi, Jae Young Park, Sang Sub Kim

Inha University

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

110 Scopus citations

Abstract

The growth behavior of nanograins in CuO nanofibers was investigated. The apparent activation energy for the growth of nanograins is estimated to be ∼18kJ/mol, which is smaller by one order of magnitude compared with those of bulk oxide ceramics. The isothermal grain growth behavior exhibits the lattice diffusion in a pore control scheme as a main growth mechanism. The sensing properties of the sensors fabricated with the CuO nanofibers have been investigated in terms of CO and NO₂. Importantly, the sensitivity of the sensor fabricated with CuO nanofibers having larger nanograins is much higher than that of the sensor with smaller nanograins. The results suggest not only that the electrospinning-synthesized p-type CuO nanofibers hold promise for realizing sensitive and reliable gas sensors, also that calcination conditions need to be optimized to obtain the best sensing properties.

Original language	English
Pages (from-to)	550-556
Number of pages	7
Journal	Chemical Engineering Journal
Volume	172
Issue number	1
DOIs	https://doi.org/10.1016/j.cej.2011.05.100
State	Published - 1 Aug 2011

Keywords

CuO
Grain growth
Nanofiber
Sensing property

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10.1016/j.cej.2011.05.100

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title = "Growth behavior and sensing properties of nanograins in CuO nanofibers",

abstract = "The growth behavior of nanograins in CuO nanofibers was investigated. The apparent activation energy for the growth of nanograins is estimated to be ∼18kJ/mol, which is smaller by one order of magnitude compared with those of bulk oxide ceramics. The isothermal grain growth behavior exhibits the lattice diffusion in a pore control scheme as a main growth mechanism. The sensing properties of the sensors fabricated with the CuO nanofibers have been investigated in terms of CO and NO2. Importantly, the sensitivity of the sensor fabricated with CuO nanofibers having larger nanograins is much higher than that of the sensor with smaller nanograins. The results suggest not only that the electrospinning-synthesized p-type CuO nanofibers hold promise for realizing sensitive and reliable gas sensors, also that calcination conditions need to be optimized to obtain the best sensing properties.",

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AU - Choi, Sun Woo

AU - Park, Jae Young

AU - Kim, Sang Sub

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N2 - The growth behavior of nanograins in CuO nanofibers was investigated. The apparent activation energy for the growth of nanograins is estimated to be ∼18kJ/mol, which is smaller by one order of magnitude compared with those of bulk oxide ceramics. The isothermal grain growth behavior exhibits the lattice diffusion in a pore control scheme as a main growth mechanism. The sensing properties of the sensors fabricated with the CuO nanofibers have been investigated in terms of CO and NO2. Importantly, the sensitivity of the sensor fabricated with CuO nanofibers having larger nanograins is much higher than that of the sensor with smaller nanograins. The results suggest not only that the electrospinning-synthesized p-type CuO nanofibers hold promise for realizing sensitive and reliable gas sensors, also that calcination conditions need to be optimized to obtain the best sensing properties.

AB - The growth behavior of nanograins in CuO nanofibers was investigated. The apparent activation energy for the growth of nanograins is estimated to be ∼18kJ/mol, which is smaller by one order of magnitude compared with those of bulk oxide ceramics. The isothermal grain growth behavior exhibits the lattice diffusion in a pore control scheme as a main growth mechanism. The sensing properties of the sensors fabricated with the CuO nanofibers have been investigated in terms of CO and NO2. Importantly, the sensitivity of the sensor fabricated with CuO nanofibers having larger nanograins is much higher than that of the sensor with smaller nanograins. The results suggest not only that the electrospinning-synthesized p-type CuO nanofibers hold promise for realizing sensitive and reliable gas sensors, also that calcination conditions need to be optimized to obtain the best sensing properties.

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Growth behavior and sensing properties of nanograins in CuO nanofibers

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