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Web End = Journal of ELECTRONIC MATERIALS, Vol. 45, No. 8, 2016
DOI: 10.1007/s11664-016-4629-8
2016 The Minerals, Metals & Materials Society
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Web End = EDTA-Decorated Nanostructured ZnO/CdS Thin Films for Oxygen Gas Sensing Applications
L. ARUNRAJA,1,2,6 P. THIRUMOORTHY,3 A. KARTHIK,4 V. RAJENDRAN,4 and L. EDWINPAUL5
1.Research and Development Centre, Department of Electronics, Bharathiar University, Coimbatore 641 046, Tamil Nadu, India. 2.Department of Electronics and Communication, K.S. Rangasamy College of Arts and Science, Tiruchengode 637 215, Tamil Nadu, India. 3.Department of Electronics and Communication, Government Arts College, Dharmapuri 636 705, Tamil Nadu, India. 4.Centre for Nanoscience and Technology, K.S. Rangasamy College of Technology, Tiruchengode 637 215, Tamil Nadu, India. 5.Central Leather Research Institute (CLRI), Adyar, Chennai 600 020, Tamil Nadu, India. 6.e-mail: [email protected]
ZnO/CdS and ZnO/CdS-EDTA nanostructured thin lms were prepared on a glass substrate using spin-coating and used for oxygen gas sensor applications. The structural properties of both ZnO/CdS and ZnO/CdS-EDTA nanostructured composites were comparatively characterized. The nanostructure thin lm was found in a hexagonal structure with an average crystallite size reduced from 77 nm to 29 nm due to the inuence of the EDTA. The optical absorption, photo luminescence, functional groups and surface morphology of the nanostructured thin lms were comprehensively investigated. Oxygen was suitably tailored to verify the sensor response over a concentration range of 1050 ppm at room temperature. Thus, the sensor studies reveal that the performance, response, and recovery time were enhanced in ZnO/ CdS-EDTA nanostructured thin lm compared with ZnO/CdS.
Key words: ZnO/CdS nanocomposites, EDTA, thin lms, oxygen gas sensor
INTRODUCTION
Semiconductors such as GaP, CdS, GaAs, TiO2,
ZnO, SrTiO3, WO3 and SnO2 are widely used in sensor applications. In recent years, gas sensors have gained much attention due to their sensitized reactions to different gases such as CO2, H2, O2,
NO2, and CO. These raw materials are used as gas-sensitive detectors in various industrial sources and prevent accident causes of gas leakage/emission and, hence, save lives and devices.1,2
In particular, oxygen sensors play a key role in automobile engine management, for optimizing industrial boilers,...