论文标题
金属到绝缘体的过渡，巨大的塞贝克系数和超低导热率
Metal to insulator transition, colossal Seebeck coefficient and ultralow thermal conductivity in solution-processed monodispersed nickel nanoparticles
论文作者
论文摘要
我们在此报告金属为绝缘体过渡，巨大的Seebeck系数和超动导热率（其大块值的0.0057位，明显小于许多著名的热电材料和硅，显示了在单层分散良好的ni Nani nani Nannaneporticles中，显示了热电学，电子和光子的热能中的潜在应用）。结果，与其大体相比，热电功率因数和功绩数量显着增强。有趣的是，已经观察到，从金属到半导体到最终电绝缘行为的系统交叉，抗电阻的大温度系数和N型传导到p型传导，并观察到颗粒尺寸的降低。这些结果主要归因于金属/有机界面的形成，通过各种缺陷来增强局部电子密度，多尺度电子和声子散射的局部电子密度。因此，这项研究将通过将这种纳米颗粒纳入半导体宿主中，为更好的热电学开放新的途径。
We report here metal to insulator transition, colossal Seebeck coefficient and ultralow thermal conductivity (0.0057th of its bulk value, significantly smaller than many well-known thermoelectric materials and silicon, showing potential applications in thermoelectrics, electronics and photonics for heat dissipation) in monodispersed well characterized Ni nanoparticles. As a consequence, thermoelectric power factor and figure of merit are significantly enhanced compared to their bulk counterpart. Interestingly, a systematic crossover from metallic to semiconducting to finally electrically insulating behavior, large negative temperature coefficient of resistance and n-type conduction to p-type conduction with decrease in particle size have been observed. These results are mainly attributed to formation of metal/organic interfaces, enhancement in local electronic density of sates and multiscale electron and phonon scattering by various defects. Thus, this study will open a new avenue to make better thermoelectrics through incorporation of such nanoparticles in semiconducting hosts.
