Zhmurova Anna V, Prozorova Galina F, Korzhova Svetlana A, Pozdnyakov Alexander S, Zvereva Marina V
A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of Russian Academy of Sciences, Favorsky 1, 664033 Irkutsk, Russia.
Materials (Basel). 2023 Jun 28;16(13):4676. doi: 10.3390/ma16134676.
In this work, the structural characteristics and DC electrical conductivity of firstly synthesized organic-inorganic nanocomposites of thermoelectric Te nanoparticles (1.4, 2.8, 4.3 wt%) and poly(1-vinyl-1,2,4-triazole) (PVT) were analyzed. The composites were characterized by high-resolution transmission electron microscopy, X-ray diffractometry, UV-Vis spectroscopy, and dynamic light scattering analysis. The study results showed that the nanocomposite nanoparticles distributed in the polymer matrix had a shape close to spherical and an average size of 4-18 nm. The average size of the nanoparticles was determined using the Brus model relation. The optical band gap applied in the model was determined on the basis of UV-Vis data by the Tauc method and the 10% absorption method. The values obtained varied between 2.9 and 5.1 nm. These values are in good agreement with the values of the nanoparticle size, which are typical for their fractions presented in the nanocomposite. The characteristic sizes of the nanoparticles in the fractions obtained from the Pesika size distribution data were 4.6, 4.9, and 5.0 nm for the nanocomposites with percentages of 1.4, 2.8, and 4.3%, respectively. The DC electrical conductivity of the nanocomposites was measured by a two-probe method in the temperature range of 25-80 °C. It was found that the formation of an inorganic nanophase in the PVT polymer as well as an increase in the average size of nanoparticles led to an increase in the DC conductivity over the entire temperature range. The results revealed that the DC electrical conductivity of nanocomposites with a Tellurium content of 2.8, 4.3 wt% at 80 °C becomes higher than the conventional boundary of 10 S/cm separating dielectrics and semiconductors.
在本研究中，对首次合成的热电碲纳米颗粒（1.4%、2.8%、4.3%重量比）与聚（1-乙烯基-1,2,4-三唑）（PVT）的有机-无机纳米复合材料的结构特征和直流电导率进行了分析。通过高分辨率透射电子显微镜、X射线衍射法、紫外-可见光谱法和动态光散射分析对复合材料进行了表征。研究结果表明，分布在聚合物基体中的纳米复合纳米颗粒形状接近球形，平均尺寸为4-18纳米。纳米颗粒的平均尺寸通过布儒斯模型关系确定。模型中应用的光学带隙基于紫外-可见数据通过陶克方法和10%吸收法确定。得到的值在2.9至5.1纳米之间变化。这些值与纳米颗粒尺寸的值非常吻合，这对于纳米复合材料中所呈现的其分数来说是典型的。从佩西卡尺寸分布数据获得的分数中，纳米复合材料中纳米颗粒的特征尺寸分别为1.4%、2.8%和4.3%重量比时为4.6、4.9和5.0纳米。通过两探针法在25-80°C温度范围内测量了纳米复合材料的直流电导率。发现PVT聚合物中无机纳米相的形成以及纳米颗粒平均尺寸的增加导致在整个温度范围内直流电导率增加。结果表明，碲含量为2.8%、4.3%重量比的纳米复合材料在80°C时的直流电导率高于区分电介质和半导体的10 S/cm的传统界限。
