Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods

Abstract Recently, metal oxide nanocrystallites have been synthesized through a new pathway, i.e., the submerged photosynthesis of crystallites (SPSC), and flower-like ZnO nanostructures have been successfully fabricated via this method. However, the photochemical reactions involved in the SPSC proc...

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Autores principales:	Lihua Zhang, Melbert Jeem, Kazumasa Okamoto, Seiichi Watanabe
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/eb8f83102cc045429e36e88fb0e3741c
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spelling	oai:doaj.org-article:eb8f83102cc045429e36e88fb0e3741c2021-12-02T15:08:51ZPhotochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods10.1038/s41598-017-18572-82045-2322https://doaj.org/article/eb8f83102cc045429e36e88fb0e3741c2018-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-18572-8https://doaj.org/toc/2045-2322Abstract Recently, metal oxide nanocrystallites have been synthesized through a new pathway, i.e., the submerged photosynthesis of crystallites (SPSC), and flower-like ZnO nanostructures have been successfully fabricated via this method. However, the photochemical reactions involved in the SPSC process and especially the role of light are still unclear. In the present work, we discuss the reaction mechanism for SPSC-fabricated ZnO nanostructures in detail and clarify the role of light in SPSC. The results show that both photoinduced reactions and hydrothermal reactions are involved in the SPSC process. The former produces OH radicals, which is the main source of OH − at the ZnO crystal tips, whereas the latter generates ZnO. Although ZnO nanocrystals can be obtained under both UV irradiation and dark conditions with the addition of thermal energy, light promotes ZnO growth and lowers the water pH to neutral, whereas thermal energy promotes ZnO corrosion and increases the water pH under dark conditions. The study concludes that the role of light in the submerged photosynthesis of crystallites process is to enhance ZnO apical growth at relatively lower temperature by preventing the pH of water from increasing, revealing the environmentally benign characteristics of the present process.Lihua ZhangMelbert JeemKazumasa OkamotoSeiichi WatanabeNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-13 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Lihua Zhang Melbert Jeem Kazumasa Okamoto Seiichi Watanabe Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods
description	Abstract Recently, metal oxide nanocrystallites have been synthesized through a new pathway, i.e., the submerged photosynthesis of crystallites (SPSC), and flower-like ZnO nanostructures have been successfully fabricated via this method. However, the photochemical reactions involved in the SPSC process and especially the role of light are still unclear. In the present work, we discuss the reaction mechanism for SPSC-fabricated ZnO nanostructures in detail and clarify the role of light in SPSC. The results show that both photoinduced reactions and hydrothermal reactions are involved in the SPSC process. The former produces OH radicals, which is the main source of OH − at the ZnO crystal tips, whereas the latter generates ZnO. Although ZnO nanocrystals can be obtained under both UV irradiation and dark conditions with the addition of thermal energy, light promotes ZnO growth and lowers the water pH to neutral, whereas thermal energy promotes ZnO corrosion and increases the water pH under dark conditions. The study concludes that the role of light in the submerged photosynthesis of crystallites process is to enhance ZnO apical growth at relatively lower temperature by preventing the pH of water from increasing, revealing the environmentally benign characteristics of the present process.
format	article
author	Lihua Zhang Melbert Jeem Kazumasa Okamoto Seiichi Watanabe
author_facet	Lihua Zhang Melbert Jeem Kazumasa Okamoto Seiichi Watanabe
author_sort	Lihua Zhang
title	Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods
title_short	Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods
title_full	Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods
title_fullStr	Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods
title_full_unstemmed	Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods
title_sort	photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/eb8f83102cc045429e36e88fb0e3741c
work_keys_str_mv	AT lihuazhang photochemistryandtheroleoflightduringthesubmergedphotosynthesisofzincoxidenanorods AT melbertjeem photochemistryandtheroleoflightduringthesubmergedphotosynthesisofzincoxidenanorods AT kazumasaokamoto photochemistryandtheroleoflightduringthesubmergedphotosynthesisofzincoxidenanorods AT seiichiwatanabe photochemistryandtheroleoflightduringthesubmergedphotosynthesisofzincoxidenanorods
_version_	1718388034594930688

Photochemistry and the role of light during the submerged photosynthesis of zinc oxide nanorods

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