ABSTRACT In the present work, hematite iron oxide nano-particles are synthesized through a facile... more 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.
In the present work, hematite iron oxide nano-particles are synthesized through a facile wet chem... more 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 setup. 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.
Iron oxide nano-particles are synthesized from aqueous iron (III) nitrate solution through citric... more Iron oxide nano-particles are synthesized from aqueous iron (III) nitrate solution through citric acid and ethy-lene glycol assisted modified Pechini route. Synthesized particles are calcined at 400 and 600 C in air to achieve better crystallization. The phase formation behaviors of the dried and calcined powders are studied by analyzing the respective X-ray diffraction patterns. The particles calcined at 600 C are identified as pure hematite phase. However, maghemite is found as impurity with the desired hematite phase in dried particles and their counterpart calcined at 400 C. The chemi-resistive hydrogen sensing characteristics of the sensing elements prepared from the dried and calcined powders are investigated by varying the operating temperature of the sensor (275–350 C) and concentration of hydrogen gas (250–1660 ppm). The study reveals that the synthesized iron oxide particles are promising for the detection of hydrogen gas.
ABSTRACT In the present work, hematite iron oxide nano-particles are synthesized through a facile... more 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.
In the present work, hematite iron oxide nano-particles are synthesized through a facile wet chem... more 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 setup. 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.
Iron oxide nano-particles are synthesized from aqueous iron (III) nitrate solution through citric... more Iron oxide nano-particles are synthesized from aqueous iron (III) nitrate solution through citric acid and ethy-lene glycol assisted modified Pechini route. Synthesized particles are calcined at 400 and 600 C in air to achieve better crystallization. The phase formation behaviors of the dried and calcined powders are studied by analyzing the respective X-ray diffraction patterns. The particles calcined at 600 C are identified as pure hematite phase. However, maghemite is found as impurity with the desired hematite phase in dried particles and their counterpart calcined at 400 C. The chemi-resistive hydrogen sensing characteristics of the sensing elements prepared from the dried and calcined powders are investigated by varying the operating temperature of the sensor (275–350 C) and concentration of hydrogen gas (250–1660 ppm). The study reveals that the synthesized iron oxide particles are promising for the detection of hydrogen gas.
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Papers by Kiran K Atyam