Room temperature detection of H2S by flexible gold–cobalt phthalocyanine heterojunction thin films
- Resource Type
- Authors
- Dinesh K. Aswal; R. Prasad; Mohamed M. Chehimi; Shiv K. Gupta; Anil Kumar Chauhan; Kallol Roy; Ajay Singh; Mainak Roy; Nirav Joshi; Soumen Samanta; Ashwini Kumar; Anil K. Debnath
- Source
- Sensors and Actuators B: Chemical. 206:653-662
- Subject
- Materials science
Metals and Alloys
Heterojunction
Electron donor
Condensed Matter Physics
Photochemistry
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry.chemical_compound
Electron transfer
chemistry
X-ray photoelectron spectroscopy
Chemical engineering
Materials Chemistry
Phthalocyanine
Work function
Electrical and Electronic Engineering
Thin film
Instrumentation
Layer (electronics)
- Language
- ISSN
- 0925-4005
We report an improved H2S response of flexible gold (Au)–cobalt phthalocyanine (CoPc) heterojunction thin films at room temperature. The Au–CoPc films exhibit very high charge carrier density at the surface due to (i) the difference in work function of Au and CoPc and (ii) enhanced adsorbed oxygen on the CoPc surface owing to spillover effect. Both of these effects make the Au–CoPc films more oxidative to the H2S in comparison to pure CoPc films. The response of the films on exposure to H2S is attributed to the shrinkage of the hole accumulation layer of CoPc due to electron transfer from adsorbed electron donor H2S. The gas sensing characteristics of the films were found to be stable for the bending radius >20 mm.