School of Chemical Engineering, Purdue University, West Lafayette, IN 47907, USA.
Nanoscale. 2011 Oct 5;3(10):4078-81. doi: 10.1039/c1nr10624d. Epub 2011 Aug 22.
The large thermal conductivity of bulk complex metal oxides such as SrTiO(3), NaCo(2)O(4), and Ca(3)Co(4)O(9) has set a barrier for the improvement of thermoelectric figure of merit and the applications of these materials in high temperature (≥1000 K) thermoelectric energy harvesting and solid-state cooling. Here, we present a self-templated synthesis approach to grow ultrathin SrTiO(3) nanowires with an average diameter of 6 nm in large quantity. The thermal conductivity of the bulk pellet made by compressing nanowire powder using spark plasma sintering shows a 64% reduction in thermal conductivity at 1000 K, which agrees well with theoretical modeling.
块状复合金属氧化物（如 SrTiO(3)、NaCo(2)O(4)和 Ca(3)Co(4)O(9)）具有较大的热导率，这对提高热电优值以及在高温（≥1000 K）热电能量收集和固态冷却中应用这些材料造成了障碍。在这里，我们提出了一种自模板合成方法，可大量生长平均直径为 6nm 的超薄 SrTiO(3)纳米线。使用火花等离子烧结法压缩纳米线粉末制成的块状样品的热导率在 1000 K 时降低了 64%，这与理论模型吻合较好。
