Influence of Erbium Doping on Hydrothermally Synthesized ZnO Nanostructures and Their Enhanced Gas Sensing Properties

(E-pub Ahead of Print)

Author(s): Parag V Adhyapak*, Laxmi Deepika Bharatula, Amruta Rathi, Sunjae Jang, Taesung Kim, Dinesh Amalnerkar.

Journal Name:Current Smart Materials

Volume 2 , 2017

Abstract:

BACKGROUND: One of the most widely researched metal oxide semiconductors for versatile applications is ZnO. Especially the wide bandgap of 3.37 eV and large excitation energy of 60 meV makes it an efficient semiconductor for various optical, electrical and thermal applications. The promising applications of ZnO include UV absorbers, photo catalysis, solar cells, field effect transistors etc.

METHODS: Hierarchical Zinc Oxide (ZnO) and Erbium doped Zinc Oxide (Er:ZnO) nanostructures were successfully synthesized by using facile citrate and polyethylene glycol (PEG) assisted hydrothermal process. The as-prepared ZnO and Er:ZnO samples were characterized by X-ray diffraction analysis (XRD), field emission scanning electron microscopy (FE-SEM), Photoluminescence (PL) spectroscopy and UV–visible spectroscopy. The effect of doping on the formation of distinctive morphology was systematically established.

RESULTS: Gas sensing activities of the as-prepared samples were monitored by testing reducing gases like Acetone, Ethanol, Ammonia, TEA, EDA, Formaldehyde and DMSO. The sensitivity towards the test gases was observed to be increased after Er doping. Both ZnO and Er:ZnO displayed the maximum response towards Acetone followed by TEA.

CONCLUSION: Hierarchical ZnO and 3% Er doped ZnO were prepared by facile PEG and citrate assisted hydrothermal method. The structure, morphology and optical properties were studied using various characterization methods. All the properties were observed to be enhanced after doping with erbium. The gas sensing properties at an optimum temperature of 3000C was investigated. The sensitivity towards the test gases increased after doping. Both ZnO and Er:ZnO displayed the maximum response towards Acetone followed by TEA.

Keywords: Hydrothermal process, Gas sensing, Erbium, Zinc Oxide

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Article Details

VOLUME: 2
Year: 2017
(E-pub Ahead of Print)
DOI: 10.2174/2405465802666170517150820
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