Hematite iron oxide nano-particles: facile synthesis and their chemi-resistive response towards hydrogen. (30th April 2015)

• Record Type: Journal Article
• Authors: Atyam, K K; Ghosh, A; Mukherjee, K; Majumder, S B
• Is Part Of: Materials research express. Volume 2:Number 5(2015)
• Publication Date: 2015-04-30
• Subjects: iron oxide -- nano-particle -- gas sensor -- hydrogen; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/2/5/055901
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: In the present work, hematite iron oxide nano-particles are synthesized through a facile wet chemical precipitation route. The phase formation behavior and microstructure evolution of the synthesized nano-particles are studied using infrared spectroscopy in conjunction with x-ray diffraction analyses and electron microscopy. Chemi-resistive type hydrogen sensing characteristics (e.g. response %, response time, recovery time) of hematite iron oxide nano-particulate sensing element are evaluated using an automated, dynamic flow gas sensing measurement set-up. The sensing characteristics are measured by varying the operating temperature (275–350 °C) of the sensor and concentration of hydrogen (250–1660 ppm). From the operating temperature dependence of response and recovery times, we have estimated the respective activation energies for response and recovery processes.