Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure

Zinc oxide (ZnO) nanomaterials were efficiently synthesized using a microwave plasma torch system at atmospheric pressure. The Zn powder was passed through a microwave plasma region, in which it melted and vaporized. Tetrapod-type ZnO nanomaterials with a diameter of 29.8 ± 8.0 nm were synt...

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Main Authors:	Byeong-Joo Lee, Sung-Il Jo, Goo-Hwan Jeong
Format:	Article
Language:	English
Published:	MDPI AG 2019-06-01
Series:	Nanomaterials
Subjects:	zinc oxide nanowire microwave plasma atmospheric pressure compressed air
Online Access:	https://www.mdpi.com/2079-4991/9/7/942

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spelling	doaj-a7bbae6b3d0448168e331b1bb8fe546d2020-11-25T00:12:12ZengMDPI AGNanomaterials2079-49912019-06-019794210.3390/nano9070942nano9070942Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric PressureByeong-Joo Lee0Sung-Il Jo1Goo-Hwan Jeong2Department of Advanced Materials Science and Engineering, Kangwon National University, Chuncheon, Gangwon-do 24341, KoreaDepartment of Advanced Materials Science and Engineering, Kangwon National University, Chuncheon, Gangwon-do 24341, KoreaDepartment of Advanced Materials Science and Engineering, Kangwon National University, Chuncheon, Gangwon-do 24341, KoreaZinc oxide (ZnO) nanomaterials were efficiently synthesized using a microwave plasma torch system at atmospheric pressure. The Zn powder was passed through a microwave plasma region, in which it melted and vaporized. Tetrapod-type ZnO nanomaterials with a diameter of 29.8 ± 8.0 nm were synthesized using a high-purity O<sub>2</sub>/N<sub>2</sub> mixed gas. In particular, ZnO nanowires with a diameter of 109.5 ± 8.0 nm and a length of 5−6 μm were produced using an inexpensive compressed air as a microwave plasma gas. It was confirmed that the nanowires synthesized using the compressed air showed higher light absorption in the visible region than the tetrapod-type ZnO. In addition, the redshifts in the absorption peak and photoluminescence peak were observed from 370.6 to 375.2 nm and 380 to 390 nm, respectively. The obtained results can be explained by the change of energy levels due to the defects in the ZnO nanowires such as vacancies and interstitials of Zn and oxygen. Finally, we can conclude that cost-effective compressed air is appropriate not only for the synthesis of ZnO nanowire, but also the enlargement of optical absorption and emission range.https://www.mdpi.com/2079-4991/9/7/942zinc oxidenanowiremicrowave plasmaatmospheric pressurecompressed air
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Byeong-Joo Lee Sung-Il Jo Goo-Hwan Jeong
spellingShingle	Byeong-Joo Lee Sung-Il Jo Goo-Hwan Jeong Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure Nanomaterials zinc oxide nanowire microwave plasma atmospheric pressure compressed air
author_facet	Byeong-Joo Lee Sung-Il Jo Goo-Hwan Jeong
author_sort	Byeong-Joo Lee
title	Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure
title_short	Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure
title_full	Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure
title_fullStr	Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure
title_full_unstemmed	Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure
title_sort	synthesis of zno nanomaterials using low-cost compressed air as microwave plasma gas at atmospheric pressure
publisher	MDPI AG
series	Nanomaterials
issn	2079-4991
publishDate	2019-06-01
description	Zinc oxide (ZnO) nanomaterials were efficiently synthesized using a microwave plasma torch system at atmospheric pressure. The Zn powder was passed through a microwave plasma region, in which it melted and vaporized. Tetrapod-type ZnO nanomaterials with a diameter of 29.8 ± 8.0 nm were synthesized using a high-purity O<sub>2</sub>/N<sub>2</sub> mixed gas. In particular, ZnO nanowires with a diameter of 109.5 ± 8.0 nm and a length of 5−6 μm were produced using an inexpensive compressed air as a microwave plasma gas. It was confirmed that the nanowires synthesized using the compressed air showed higher light absorption in the visible region than the tetrapod-type ZnO. In addition, the redshifts in the absorption peak and photoluminescence peak were observed from 370.6 to 375.2 nm and 380 to 390 nm, respectively. The obtained results can be explained by the change of energy levels due to the defects in the ZnO nanowires such as vacancies and interstitials of Zn and oxygen. Finally, we can conclude that cost-effective compressed air is appropriate not only for the synthesis of ZnO nanowire, but also the enlargement of optical absorption and emission range.
topic	zinc oxide nanowire microwave plasma atmospheric pressure compressed air
url	https://www.mdpi.com/2079-4991/9/7/942
work_keys_str_mv	AT byeongjoolee synthesisofznonanomaterialsusinglowcostcompressedairasmicrowaveplasmagasatatmosphericpressure AT sungiljo synthesisofznonanomaterialsusinglowcostcompressedairasmicrowaveplasmagasatatmosphericpressure AT goohwanjeong synthesisofznonanomaterialsusinglowcostcompressedairasmicrowaveplasmagasatatmosphericpressure
_version_	1725400706430533632

Synthesis of ZnO Nanomaterials Using Low-Cost Compressed Air as Microwave Plasma Gas at Atmospheric Pressure

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