Correlation Between Crystal Size, Defect Level And Sensing Performance

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RSC Advances

C2H5OH and NO2 sensing properties of ZnO nanostructures: correlation between crystal size, defect level and sensing performance

Chu Thi Quy,a Nguyen Xuan Thai,a Nguyen Duc Hoa, *a Dang Thi Thanh Le,a Chu Manh Hung,a Nguyen Van Duya and Nguyen Van Hieu*a Author affiliations

* Corresponding authors

a International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No. 1, Dai Co Viet Road, Hanoi, Vietnam E-mail: [email protected], [email protected] Fax: +84 24 38692963 Tel: +84 24 38680787

Abstract

ZnO nanostructures can be synthesized using different techniques for gas sensor applications, but different synthesis methods produce different morphologies, specific surface areas, crystal sizes, and physical properties, which consequently influence the gas-sensing properties of materials. Many parameters such as morphology, specific surface areas, crystal sizes, and defect level can influence the gas-sensing properties of ZnO nanostructures. However, it is not clear which parameter dominates the gas-sensing performance. This study clarified the correlation between crystal size, defect level, and gas-sensing properties of ZnO nanostructures prepared from hydrozincite counterparts by means of field emission scanning electron microscopy, high resolution transmission electron microscopy, X-ray diffraction and photoluminescence spectra. Results showed that the average crystal size of the ZnO nanoparticles increased with thermal decomposition temperatures from 500 °C to 700 °C. However, the sample treated at 600 °C, which has the lowest visible-to-ultraviolet band intensity ratio showed the highest response to ethanol and NO2. These results suggested that defect level but not size is the main parameter dominating the sensor performance. The gas sensing mechanism was also elucidated on the basis of the correlation among decomposition temperatures, crystal size, defect level, and gas sensitivity.

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Article information

DOI https://doi.org/10.1039/C7RA13702H Article type Paper Submitted 28 Dec 2017 Accepted 29 Jan 2018 First published 01 Feb 2018 This article is Open Access

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RSC Adv., 2018,8, 5629-5639 BibTex EndNote MEDLINE ProCite ReferenceManager RefWorks RIS

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C2H5OH and NO2 sensing properties of ZnO nanostructures: correlation between crystal size, defect level and sensing performance

C. T. Quy, N. X. Thai, N. D. Hoa, D. T. Thanh Le, C. M. Hung, N. Van Duy and N. Van Hieu, RSC Adv., 2018, 8, 5629 DOI: 10.1039/C7RA13702H

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Chu Thi Quy Nguyen Xuan Thai Nguyen Duc Hoa Dang Thi Thanh Le Chu Manh Hung Nguyen Van Duy Nguyen Van Hieu

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