Fabrication of screen printed Cr2O3 thick films for gas sensing application

Author(s)	Dr. Upendra Devendra Lad
Country	India
Abstract	Chromium oxide (Cr₂O₃) nanoparticles are p-type semiconductors with a wide band gap (~3.4 eV) and high chemical stability. At the nanoscale, they provide large surface area and abundant active sites, making them useful in gas sensing, catalysis, magnetic storage, and protective coatings. Their enhanced sensitivity and fast response towards gases like NO₂, H₂S, and LPG, along with tunable morphology through various synthesis methods, make them promising materials for advanced sensing and catalytic applications. In the present work, Cr₂O₃ thick films were successfully fabricated using the screen-printing technique and evaluated for their gas sensing performance. Gas sensing studies revealed that the films demonstrated maximum sensitivity (76.54%) towards liquefied petroleum gas (LPG), particularly at a concentration of 500 ppm and an optimal operating temperature of 150 °C. The sensor displayed a rapid response time of 18 s and a recovery time of 53 s, confirming its potential for real-time detection. The results highlight that screen-printed Cr₂O₃ thick films are promising candidates for cost-effective and efficient LPG sensing applications.
Keywords	Chromium oxide, thick films, gas sensing, sensor, LPG, real-time detection
Field	Physics
Published In	Volume 5, Issue 4, July-August 2023
Published On	2023-07-06

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