Giant capacitance effect and physical model of nano crystalline CuO–BaTiO3 semiconductor as a CO2 gas sensor

Abstract

A CO2 sensor made of nano crystalline CuO–BaTiO3 semiconductor, which has a giant capacitance effect, is designed based on the principle of the physical effect in the nano cluster. After an experimental investigation of its microstructure, the correlation between the quantum size effect and the giant capacitance effect is suggested. The characteristic physical quantities relating to the giant capacitance effect of the sensor are studied systematically with the aid of a gas detector. The quantum size effect is introduced as an interpretation for the mechanism of the giant capacitance effect and a model is proposed for describing the giant capacitance effect of the sensor.

Photoactivated solid-state gas sensor for carbon dioxide detection at room temperature

“…The properties of BaTiO 3 -CuO as a carbon dioxide thermoactivated sensing material have been previously investigated [14][15][16][17][18][19][20][21][22][23][24][25][26]. Thick-film technology and sintering are used to synthesize the material in most of the research carried out [20][21][22][23][24][25][26], while thin-film technology is only reported by the authors [14][15][16][17][18][19].…”

“…Thick-film technology and sintering are used to synthesize the material in most of the research carried out [20][21][22][23][24][25][26], while thin-film technology is only reported by the authors [14][15][16][17][18][19]. The BaTiO 3 -CuO sensing films obtained by different technologies show different physical-chemical behaviour under different carbon dioxide concentrations and operation temperatures.…”

Solid state gas sensor for fast carbon dioxide detection

“…In this context, the properties of BaTiO 3 -CuO as a sensitive material under carbon dioxide atmospheres have been investigated [1][2][3][4][5][6][7][8][9][10]. Thick film technology and sintering are used to synthesize the material in most of the research works [4][5][6][7][8][9][10], while thin film technology is only reported by the authors [1][2][3].…”

“…Thick film technology and sintering are used to synthesize the material in most of the research works [4][5][6][7][8][9][10], while thin film technology is only reported by the authors [1][2][3]. Thin film technology shows advantages in terms of controllability of the process parameters and material properties.…”

Enhanced hydrothermal conversion of surfactant-modified diatom microshells into barium titanate replicas

“…[1][2][3][4][5][6][7][8] A variety of approaches (e.g., mixed oxide, mixed salt, sol-gel, polymeric precursor, hydrothermal, microemulsion, mechanochemical, and combustion syntheses) have been used to synthesize BaTiO 3 powders with fine particle and crystal sizes. [9][10][11][12][13][14][15][16][17][18][19] Nanocrystalline barium titanate-based ceramics have exhibited relatively high room-temperature dielectric constants that are temperature-and voltage-stable for integrated capacitors, 20,21 high sensitivity to water vapor and carbon dioxide for gas sensors, [22][23][24] and enhanced response of fluorescence to temperature changes for real-time temperature monitoring. 25 The worldwide interest in nanoscale ferroelectric devices has also led to the recent syntheses of BaTiO 3 nanowires, 26 nanorods, 27 nanoshell tubes, 28 and nanoshell spheres.…”