Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 299, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2019.111574
Keywords
CuPc nanoflowers; Humidity sensing; Organic-inorganic p-n heterojunction; Device aging
Funding
- RUSA2.0 [R-11/370/19]
- CSIR [143705/2K18/1, 09/096(0964)/2019-EMR-I, 09/096(0883)/2017-EMR-I, 143170/2K15/1]
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In recent times, there has been an increased demand for cost-effective, robust and highly reliable humidity sensors. 2D material MoS2 (n-type) have demonstrated their potential application in chemical and humidity sensing. In this work, an organic-inorganic p-n heterojunction based sensor has been fabricated using the inorganic MoS2 and the organic CuPc, and its viability towards humidity sensing has been experimentally demonstrated. The thin film sensor was characterized by SEM and the results revealed the formation of CuPc nanoflowers on MoS2 surface. The XRD results also indicate excellent crystallization. The sensor shows reduced resistance with increasing RH% and the variation has been observed to be almost linear. The sensing range is from 20% RH to 98% RH. The measured sensitivity is 0.615 M Omega/%RH. The demonstrated results are of great interest in terms of sensitivity, linear response, range of humidity monitoring and stability. (C) 2019 Elsevier B.V. All rights reserved.
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