Nanocrystalline Zn₂SnO₄/SnO₂ powder was obtained by a solid state reaction of ZnO and SnO₂ nanopowders mixed in the molar ratio 1:1. The phase composition of the obtained powder was studied by XRD and Raman spectroscopy, morphology and texture were characterized by FESEM, TEM, BET and Hg porosimetry, while XPS and FTIR spectroscopy were used to determine the surface chemistry. The influence of humidity on complex impedance was monitored on bulk samples in the relative humidity (RH) range 30–90% in a climatic chamber in the frequency range 42 Hz- 1 MHz at working temperatures of 25 and 50 °C. Change in RH had a significant influence on impedance reduction, especially noticeable in the lower frequency range, indicating potential application of this nanocomposite as a humidity sensing material. Increase in RH led to an increase in AC conductivity that changed with frequency according to the Jonscher power law. The frequency exponent decreased with increase in RH and sample temperature indicating that the correlated hopping barrier model is the dominant conduction mechanism. Complex impedance was analyzed using an equivalent circuit consisting of a parallel resistance and constant phase element, showing the dominant influence of grain boundaries at both working temperatures (25 and 50 °C). The resistance decreased, while the capacitance and relaxation frequency increased with increase in RH. At high humidity an added Wartburg element enabled modeling of the charge diffusion process.

通过ZnO和SnO ₂的固相反应获得纳米晶Zn ₂ SnO ₄ / SnO ₂粉末。纳米粉以1：1的摩尔比混合。用XRD和拉曼光谱法研究了所得粉末的相组成，用FESEM，TEM，BET和Hg孔隙率法表征了形貌和织构，同时用XPS和FTIR光谱法测定了表面化学性质。在25和50°C的工作温度下，在频率范围为42 Hz-1 MHz的气候室内，在相对湿度（RH）范围为30–90％的散装样品上，监测湿度对复阻抗的影响。RH的变化对阻抗的降低有重大影响，尤其是在较低的频率范围内，这表明该纳米复合材料作为湿度传感材料的潜在应用。相对湿度的增加导致交流电导率的增加，根据Jonscher功率定律，交流电导率随频率而变化。频率指数随相对湿度和样品温度的增加而降低，表明相关的跳跃势垒模型是主要的传导机制。使用由并联电阻和恒定相位元件组成的等效电路分析了复阻抗，显示了在两种工作温度（25和50°C）下晶界的主要影响。电阻降低，而电容和弛豫频率随RH的增加而增加。在高湿度下，添加的Wartburg元素可以对电荷扩散过程进行建模。显示在两种工作温度（25和50°C）下晶界的主要影响。电阻降低，而电容和弛豫频率随RH的增加而增加。在高湿度下，添加的Wartburg元素可以对电荷扩散过程进行建模。显示在两种工作温度（25和50°C）下晶界的主要影响。电阻降低，而电容和弛豫频率随RH的增加而增加。在高湿度下，添加的Wartburg元素可以对电荷扩散过程进行建模。