Fabrication of a semi-transparent flexible humidity sensor using kinetically sprayed cupric oxide film
- Authors
- Kim, Hyungsub; Park, Soobin; Park, Yunchan; Choi, Dahyun; Yoo, Bongyoung; Lee, Sunyong Caroline
- Issue Date
- Nov-2018
- Publisher
- Elsevier BV
- Keywords
- Cupric oxide; Flexible sensor; Humidity; Kinetic spray
- Citation
- Sensors and Actuators, B: Chemical, v.274, pp.331 - 337
- Indexed
- SCIE
SCOPUS
- Journal Title
- Sensors and Actuators, B: Chemical
- Volume
- 274
- Start Page
- 331
- End Page
- 337
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/5111
- DOI
- 10.1016/j.snb.2018.07.127
- ISSN
- 0925-4005
- Abstract
- In this study, a cupric oxide (CuO) flexible humidity sensor was fabricated using a kinetic spray process. After deposition of a 200-nm-thick Cu film, the as-deposited Cu layer was annealed at 250 degrees C, a relatively low temperature, in air conditions to create a CuO layer. N-type CuO (carrier concentration: -23.08x10(14) cm(-3)) formed after reacting with oxygen during the annealing process in air via oxygen vacancy formation. The semi-transparent properties of the CuO film were characterized by measuring visible light transmittance. Stable sensing signals of 0.16-0.18 were obtained after the 1000th bending test. Scanning electron microscopy was used to examine the surface morphology of the CuO layer after the bending test; despite the presence of a few microcracks, delamination was not observed. Thus, a CuO-based humidity sensor was successfully fabricated through simple particle spray deposition and low-temperature annealing processes; the sensor maintained its performance under repeated bending stress (up to 1000 cycles).
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