Investigation of the key parameters for gas sensing through comparison of electrospun and sol-gel semiconducting oxides
Investigation of the key parameters for gas sensing through comparison of electrospun and sol-gel semiconducting oxides
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DOI：
10.1016/j.ceramint.2022.04.087
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发表时间：
2022-04
影响因子：
5.2
通讯作者：
A. Fioravanti;S. Morandi;Alberto Rubin Pedrazzo;Claudio Cecone;M. Manzoli;M. Zanetti;P. Bracco;M. Mazzocchi;S. Lettieri;P. Marani;M. Carotta
中科院分区：
文献类型：
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作者：
A. Fioravanti;S. Morandi;Alberto Rubin Pedrazzo;Claudio Cecone;M. Manzoli;M. Zanetti;P. Bracco;M. Mazzocchi;S. Lettieri;P. Marani;M. Carotta
本研究的目的是突出的参数，主要是表征用于气体传感的半导体金属氧化物的化学电阻效应的效率。为了实现这一目标，基于纳米结构的ZnO、SnO 2和TiO 2粉末制备了样品和气敏器件，这些是大多数化学传感器所基于的材料。采用静电纺丝技术和溶胶-凝胶法制备样品。这些材料的特点是在质地，结构和形态特性。对不同材料制备的厚膜进行了电学和气敏测试，证明了其与粉体特性的关系，静电纺丝技术制备的纤维由球形颗粒组成，这也是溶胶-凝胶材料的特征。特别是，无论的合成方法，材料是由颗粒的结晶域的聚集体和暴露的比表面积与这些聚集体的尺寸，而不是与微晶size.Fundamental电气行为被发现为不同的材料，无论合成程序。通过使用不同气体（如一氧化碳、丙酮和异戊二烯）进行的传感测试表明，在相同的材料中，以最高的比表面积获得最佳性能。
The present study aims to highlight the parameters that mostly characterize the efficiency of chemo-resistive effects in semiconductor metal oxides used for gas sensing. To this goal, samples and gas-sensing devices were prepared based on nanostructured ZnO, SnO2and TiO2powders, these being the materials on which most chemical sensors are based. Samples were synthesized by both electrospinning technique and sol-gel route. The materials were characterized in terms of textural, structural and morphological properties. Electrical and gas sensing measurements were performed on thick films obtained from the different materials, putting in evidence the relationships with the powder characteristics.The fibers obtained by electrospinning technique revealed to be constituted by spherical particles, which characterize the sol-gel materials as well. In particular, regardless of the synthetic method, the materials are constituted by particles that are aggregates of crystalline domains and the specific surface areas exposed correlate with the dimensions of these aggregates, rather than with the crystallite sizes.Fundamental electrical behaviours were found for the different materials, irrespective of the synthetic procedure. Sensing tests, performed by using different gases, such as carbon monoxide, acetone and isoprene, show that, within the same material, the best performances are obtained with the highest specific surface area.