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Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications

The rapidly advancing technology of wearable and miniaturized electronics has increased the demand for low-cost high-performance flexible sensors. Herein, the preparation of translucent freestanding films consisting of cellulose nanofibers (CNFs) and ZnO nanoparticles (NPs) via a simple spray coatin...

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Autores principales: Komatsu, Hiroaki, Kawamoto, Yurika, Ikuno, Takashi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8954166/
https://www.ncbi.nlm.nih.gov/pubmed/35335753
http://dx.doi.org/10.3390/nano12060940
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author Komatsu, Hiroaki
Kawamoto, Yurika
Ikuno, Takashi
author_facet Komatsu, Hiroaki
Kawamoto, Yurika
Ikuno, Takashi
author_sort Komatsu, Hiroaki
collection PubMed
description The rapidly advancing technology of wearable and miniaturized electronics has increased the demand for low-cost high-performance flexible sensors. Herein, the preparation of translucent freestanding films consisting of cellulose nanofibers (CNFs) and ZnO nanoparticles (NPs) via a simple spray coating method is presented. The obtained nanocomposite films were thin (~10 µm) and flexible. The scanning electron microscopy and atomic force microscopy analysis revealed that the nanocomposite film was composed of regions of ZnO NP-modified CNFs and regions of aggregation of ZnO NPs with each other. The electrical conductance of the films was rapidly increased beyond 40 wt.% ZnO and reached up to >50 nA at 60 wt.% ZnO. This was attributed to the increased number of conductive paths formed by the ZnO NPs in the nanocomposite film when a certain threshold was crossed. The ZnO–CNF nanocomposite film exhibited a stable response over on/off cycles of UV light exposure. The responsivity and sensitivity of the nanocomposite film with 60 wt.% ZnO were 36.5 mA/W and 247, respectively. Even when the device was curved (radius of curvature: 3 mm), the response and sensitivity remained high. The developed nanocomposite films are expected to be applied as environmentally friendly flexible UV sensors.
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spelling pubmed-89541662022-03-26 Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications Komatsu, Hiroaki Kawamoto, Yurika Ikuno, Takashi Nanomaterials (Basel) Article The rapidly advancing technology of wearable and miniaturized electronics has increased the demand for low-cost high-performance flexible sensors. Herein, the preparation of translucent freestanding films consisting of cellulose nanofibers (CNFs) and ZnO nanoparticles (NPs) via a simple spray coating method is presented. The obtained nanocomposite films were thin (~10 µm) and flexible. The scanning electron microscopy and atomic force microscopy analysis revealed that the nanocomposite film was composed of regions of ZnO NP-modified CNFs and regions of aggregation of ZnO NPs with each other. The electrical conductance of the films was rapidly increased beyond 40 wt.% ZnO and reached up to >50 nA at 60 wt.% ZnO. This was attributed to the increased number of conductive paths formed by the ZnO NPs in the nanocomposite film when a certain threshold was crossed. The ZnO–CNF nanocomposite film exhibited a stable response over on/off cycles of UV light exposure. The responsivity and sensitivity of the nanocomposite film with 60 wt.% ZnO were 36.5 mA/W and 247, respectively. Even when the device was curved (radius of curvature: 3 mm), the response and sensitivity remained high. The developed nanocomposite films are expected to be applied as environmentally friendly flexible UV sensors. MDPI 2022-03-12 /pmc/articles/PMC8954166/ /pubmed/35335753 http://dx.doi.org/10.3390/nano12060940 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Komatsu, Hiroaki
Kawamoto, Yurika
Ikuno, Takashi
Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications
title Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications
title_full Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications
title_fullStr Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications
title_full_unstemmed Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications
title_short Freestanding Translucent ZnO–Cellulose Nanocomposite Films for Ultraviolet Sensor Applications
title_sort freestanding translucent zno–cellulose nanocomposite films for ultraviolet sensor applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8954166/
https://www.ncbi.nlm.nih.gov/pubmed/35335753
http://dx.doi.org/10.3390/nano12060940
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