Development of the Zn-ZnO(Nw)@CuMnO2 Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication

Nicolaescu, Mircea; Bandas, Cornelia; Orha, Corina; Purcar, Violeta; Lazau, Carmen

doi:10.3390/coatings12111630

Open AccessArticle

Development of the Zn-ZnO(Nw)@CuMnO₂ Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication

by

Mircea Nicolaescu

^1,2,†,

Cornelia Bandas

^1,†

,

Corina Orha

^1,†,

Violeta Purcar

³

and

Carmen Lazau

^1,*

¹

National Institute for Research and Development in Electrochemistry and Condensed Matter Timisoara, Dr. A.P. Podeanu No.144, 300569 Timisoara, Romania

²

Department of Materials and Manufacturing Engineering, Faculty of Mechanical Engineering, “Politehnica” University of Timisoara, P-ta Victoriei No.2, 300006 Timisoara, Romania

³

National Institute for Research & Development in Chemistry and Petrochemistry—ICECHIM, Splaiul Independentei 202, 6th District, 060021 Bucharest, Romania

^*

Author to whom correspondence should be addressed.

^†

Contributed equally to this work as first authors.

Coatings 2022, 12(11), 1630; https://doi.org/10.3390/coatings12111630

Submission received: 30 September 2022 / Revised: 24 October 2022 / Accepted: 25 October 2022 / Published: 27 October 2022

(This article belongs to the Special Issue Functional Films/Coatings Processing Technologies: Deposition and Process)

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Abstract

In this study, the Zn-ZnO(Nw)@CuMnO₂ heterostructure was successfully achieved by deposition of a bidimensional CuMnO₂ film on the ZnO nanowires (NWs) layer, by the spin coating method. The novelty of this research is related to the growth of ZnO NWs by thermal oxidation at low temperatures, below the melting point of the Zn foil in a controlled atmosphere consisting of a mixed flow gas, Ar and O₂. The structural and morphological properties of the heterostructures were assessed by XRD, UV-Vis, and SEM techniques. The as-obtained gas sensors based on Zn-ZnO(Nw)@CuMnO₂ heterostructures were tested to detect 400 ppm. CO₂ concentration at variable testing temperatures inside the testing chamber. The maximum sensibility value of 85.5% was obtained at the lowest operating temperature of 150 °C for the ZnO_Nw5@CMO sensor, and when the temperature was increasing to 200 °C the sensibility response of 95.4% was recorded for the ZnO_Nw7@CMO sensor. Current-voltage and current-time measurements were performed under different conditions to assess the heterojunction behavior and sensibility of the gas sensor.

Keywords: semiconductors; electrical properties; “n-p” heterojunction; ZnO-CuMnO₂; sensor

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MDPI and ACS Style

Nicolaescu, M.; Bandas, C.; Orha, C.; Purcar, V.; Lazau, C. Development of the Zn-ZnO(Nw)@CuMnO₂ Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication. Coatings 2022, 12, 1630. https://doi.org/10.3390/coatings12111630

AMA Style

Nicolaescu M, Bandas C, Orha C, Purcar V, Lazau C. Development of the Zn-ZnO(Nw)@CuMnO₂ Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication. Coatings. 2022; 12(11):1630. https://doi.org/10.3390/coatings12111630

Chicago/Turabian Style

Nicolaescu, Mircea, Cornelia Bandas, Corina Orha, Violeta Purcar, and Carmen Lazau. 2022. "Development of the Zn-ZnO(Nw)@CuMnO₂ Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication" Coatings 12, no. 11: 1630. https://doi.org/10.3390/coatings12111630

APA Style

Nicolaescu, M., Bandas, C., Orha, C., Purcar, V., & Lazau, C. (2022). Development of the Zn-ZnO(Nw)@CuMnO₂ Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication. Coatings, 12(11), 1630. https://doi.org/10.3390/coatings12111630

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Development of the Zn-ZnO(Nw)@CuMnO₂ Heterojunction by Low Temperature Zn Foil Oxidation for Gas Sensor Fabrication

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