Next Article in Journal
Cross-Aldol Condensation of Acetone and n-Butanol into Aliphatic Ketones over Supported Cu Catalysts on Ceria-Zirconia
Previous Article in Journal
Fabrication of Crumpled Ball-Like Nickel Doped Palladium-Iron Oxide Hybrid Nanoparticles with Controlled Morphology as Effective Catalyst for Suzuki–Miyaura Coupling Reaction
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Catalysts 2017, 7(9), 248; doi:10.3390/catal7090248

A Zero-Power, Low-Cost Ultraviolet-C Colorimetric Sensor Using a Gallium Oxide and Reduced Graphene Oxide Hybrid via Photoelectrochemical Reactions

1
Department of Materials Engineering, Korea Aerospace University, Goyang 10540, Korea
2
Electronic Materials and Device Research Center, Korea Electronics Technology Institute, Seongnam 13509, Korea
3
Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 46241, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Yangchuan Xing
Received: 5 July 2017 / Revised: 12 August 2017 / Accepted: 23 August 2017 / Published: 24 August 2017
View Full-Text   |   Download PDF [2507 KB, uploaded 24 August 2017]   |  

Abstract

A zero-power, low-cost ultraviolet (UV)-C colorimetric sensor is demonstrated using a gallium oxide and reduced graphene oxide (rGO) hybrid via photoelectrochemical reactions. A wide bandgap semiconductor (WBS) such as gallium oxide with an energy bandgap of 4.9 eV generates electron-hole pairs (EHPs) when exposed under a mercury lamp emitting 254 nm. While the conventional UVC sensors employing WBS convert the generated EHPs into an electrical signal via a solid-state junction device (SSD), our newly proposed UVC sensory system works by converting EHPs into an electrochemical reaction. The electrochemical reaction causes the degradation of a cationic thiazine redox dye, methylene blue (MB) and thereby spontaneously changes its color. As more rGO was hybridized with the gallium oxide, MB degradation was effectively expedited. Thus, the level of MB degradation under UVC can be evaluated as a UVC indicator. Unlike conventional SSD-based UVC sensors, our responsive colorimetric sensor can be applied where needed inexpensively and zero power. View Full-Text
Keywords: gallium oxide; reduced graphene oxide; photoelectrochemical reactions; UV sensor gallium oxide; reduced graphene oxide; photoelectrochemical reactions; UV sensor
Figures

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Kim, S.; Han, K.I.; Lee, I.G.; Yoon, Y.; Park, W.K.; Hong, S.W.; Yang, W.S.; Hwang, W.S. A Zero-Power, Low-Cost Ultraviolet-C Colorimetric Sensor Using a Gallium Oxide and Reduced Graphene Oxide Hybrid via Photoelectrochemical Reactions. Catalysts 2017, 7, 248.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Catalysts EISSN 2073-4344 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top