Effect of Cu 2+ doping on the structural, optical, and vapor-sensing properties of ZnO thin films prepared by SILAR meth
- PDF / 2,594,460 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 64 Downloads / 229 Views
Effect of Cu2+ doping on the structural, optical, and vapor-sensing properties of ZnO thin films prepared by SILAR method K. Radhi Devi1, G. Selvan2,*, K. Hari Prasad3, M. Karunakaran4, K. Kasirajan4, V. Ganesh5,* , and S. AlFaify5 1
PG and Research Department of Physics, Sethupathy Govt. Arts College, Ramanathapuram, India Department of Physics, Thanthai Hans Roever College, Perambalur, India 3 Department of Physics, Institute of Aeronautical Engineering, Dundigal, Hyderabad 500043, India 4 PG and Research Department of Physics, Alagappa Govt. Arts College, Karaikudi 630003, India 5 Advanced Functional Materials & Optoelectronics Laboratory (AFMOL), Department of Physics, College of Science, King Khalid University, P.O. Box 9004, Abha 61413, Saudi Arabia 2
Received: 14 March 2020
ABSTRACT
Revised: 5 August 2020
The Cu-doped ZnO thin films were fabricated on glass slides by a two-step SILAR coating method. The diffraction data revealed that the prepared ZnO:Cu films were in the phase of Wurtzite geometry, and the grain size decreases from 37 to 26 nm. The morphological studies revealed uniform distribution of nanograins as well as a nanoflower structure. The doping samples exhibited an increase in transmittance and an increase in the bandgap. A room temperature ammonia vapor-sensing performance of Cu-doped ZnO films is also studied, and sensitivity for sensing ammonia vapor is increased with doping concentration. The sensitivity was remarkably enhanced to 12,300% and it has a relatively fast response/recovery time of 37/8 s for 100 ppm NH3 for the 5 wt% of ZnO:Cu film. Its high sensitivity and fast response make the ZnO:Cu film a good contender for high-quality gas sensor devices.
Accepted: 8 August 2020
Ó
Springer Science+Business
Media, LLC, part of Springer Nature 2020
1 Introduction During the past few years, scientists and researchers have been focusing their superior attention and extensive efforts to develop various real-time novel gas sensors for the safety of human and environmental health issue problems. Because many toxic and easily flammable gases such as H2S, CO, CO2,
Cl2, SO2, NH3, NOx, CH3OH, etc., are released due to rapid industrialization as well as economic growth [1]. Among them, NH3 is considered one of the highly toxic gases that can lead to severe health issues like headaches, irritation of eyes, coughing, and sometimes death even at low dosages [2]. Nowadays, metal oxides such as ZnO, In2O3, TiO2, and SnO2 are deducting materials in chemical sensors
Address correspondence to E-mail: [email protected]; [email protected]
https://doi.org/10.1007/s10854-020-04210-z
J Mater Sci: Mater Electron
because of their stability, suitability to adding impurities, and nontoxicity. Among different metal oxides, ZnO has been attracting many researchers due to its preparation methods and device applications. It is prepared in different forms, but useful form for gas-sensing application is thin films due to their sensitivity compared to other types of ZnO structure. They provide a wid
Data Loading...
