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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Electrical properties of composites with tin-tin oxide core-shell nanostructure and their sensing behaviour
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Electrical properties of composites with tin-tin oxide core-shell nanostructure and their sensing behaviour

机译：锡-锡氧化物核-壳纳米结构复合材料的电性能及其传感行为

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摘要

Metallic tin having a dendritic structure was grown within a silica-based gel by an electrodeposition technique. The dendrites were shown to consist of nanoparticles with a median diameter of 31 nm. By giving a controlled oxidation treatment to the composite, a tin core-tin oxide shell nanostructure was induced. The shell thicknesses varied from 1.5 to 4.0 nm depending on the duration of oxidation. The electrical conductivity of the composite structure was shown to be controlled by a small polaron hopping conduction. The nanoshell comprised SnO and SnO2 phases, respectively, and electrical conduction is believed to arise due to the hopping of electrons between Sn2+ and Sn4+ ions at the interfaces of these two regions. The composite films exhibited a three order of magnitude decrease in resistivity as the relative humidity was varied from 35% to 95%. Electrons from hydroxyl groups of adsorbed water molecules are believed to form localized states at the tin ion sites which cause an increase in electrical conductivity. The nanocomposites also exhibit substantial resistivity changes when exposed to CO, C2H5OH and NO2 gases, respectively. The effect is believed to result from reduction or oxidation of the tin ions by the gas molecules concerned.
机译：通过电沉积技术在二氧化硅基凝胶内生长具有树枝状结构的金属锡。显示出树枝状晶体由中值直径为31 nm的纳米粒子组成。通过对复合材料进行受控的氧化处理，诱导了锡芯-氧化锡壳纳米结构。壳的厚度从1.5到4.0 nm不等，取决于氧化的持续时间。事实表明，复合结构的电导率受小的极化子跳跃传导的控制。纳米壳分别包含SnO和SnO2相，并且据信由于这两个区域的界面处Sn2 +和Sn4 +离子之间的电子跳跃而产生了导电。随着相对湿度从35％到95％变化，复合膜的电阻率降低了三个数量级。据信来自吸附的水分子的羟基的电子在锡离子位点形成局部态，这导致电导率增加。当分别暴露于CO，C2H5OH和NO2气体时，纳米复合材料还显示出明显的电阻率变化。据信该作用是由于所涉及的气体分子还原或氧化了锡离子所致。

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