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Open AccessArticle

Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity

1
School of Chemical Engineering, University of Ulsan, Daehak-ro 93, Nam-gu, Ulsan 680-749, Korea
2
Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
*
Author to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1441; https://doi.org/10.3390/nano9101441
Received: 5 September 2019 / Revised: 25 September 2019 / Accepted: 1 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Multifunctional Graphene-Based Nanocomposites)
Zinc oxide/reduced graphene oxide nanocomposites (ZnO/rGO) are synthesized via a simple one-pot solvothermal technique. The nanoparticle–nanorod turnability was achieved with the increase in GO additive, which was necessary to control the defect formation. The optimal defect in ZnO/rGO not only increased ZnO/rGO surface and carrier concentration, but also provided the alternative carrier pathway assisted with rGO sheet for electron–hole separation and prolonging carrier recombination. These properties are ideal for photodetection and photocatalytic applications. For photosensing properties, ZnO/rGO shows the improvement of photosensitivity compared with pristine ZnO from 1.51 (ZnO) to 3.94 (ZnO/rGO (20%)). Additionally, applying bending strain on ZnO/rGO enhances its photosensitivity even further, as high as 124% at r = 12.5 mm, due to improved surface area and induced negative piezoelectric charge from piezoelectric effect. Moreover, the photocatalytic activity with methylene blue (MB) was studied. It was observed that the rate of MB degradation was higher in presence of ZnO/rGO than pristine ZnO. Therefore, ZnO/rGO became a promising materials for different applications. View Full-Text
Keywords: ZnO/rGO nanocomposites; UV detection; photocatalytics; morphological tunability; GO additive ZnO/rGO nanocomposites; UV detection; photocatalytics; morphological tunability; GO additive
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Rodwihok, C.; Wongratanaphisan, D.; Thi Ngo, Y.L.; Khandelwal, M.; Hur, S.H.; Chung, J.S. Effect of GO Additive in ZnO/rGO Nanocomposites with Enhanced Photosensitivity and Photocatalytic Activity. Nanomaterials 2019, 9, 1441.

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    Doi: 10.5281/zenodo.3460483
    Link: https://zenodo.org/record/3460483/files/Supplementary%20Information.pdf?download=1
    Description: Supplementary information Content: Table S1. Comparisons of photosensitivity and time-dependent photocurrent response between the present work and other reported UV detectors. Table S2. Comparisons of photocatalytic activity between the present work and other reported research. Figure S1. The thickness of prepared films by spray coating Figure S2. Current of as-synthesized ZnO/rGO with bending radius; (a) ZnO, (b) ZnO/rGO (10%), (c) ZnO/rGO (20%), and (d) ZnO/rGO (30%). Figure S3. Time-dependent absorption spectra of Methyl blue (MB) solution under visible light using (a) ZnO, (b) ZnO/rGO (10%), (c) ZnO/rGO (20%), and ZnO/rGO (30%) as a photocatalyst. Figure S4. The photoluminescence spectra of pristine ZnO and as-synthesized ZnO/rGO
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