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Quantitative nanoscale mapping of three-phase thermal conductivities in filled skutterudites via scanning thermal microscopy

查看全文 作　　者：ehsan nasr [1,2]esfahani;feiyue [1]ma;shanyu [3]wang;yun [2]ou;jihui [3]yang;jiangyu [1,2]li 高影响力作者 机构地区：[1]department of mechanical engineering,university of washington,Seattle,wa 98195,usa;[2]shenzhen key laboratory of nanobiomechanics,shenzhen institutes of advanced technology,chinese academy of sciences,shenzhen 518055,china;[3]department of materials science andengineering,university of washington,Seattle,wa 98195,usa高影响力机构 出　　处：《National Science Review》索引2018年第5卷第1期,共11页高影响力期刊 基　　金：National Key Research and Development Program of China(2016YFA0201001);the National Natural Science Foundation of China(11627801 and 11472236);the US National Science Foundation(CBET-1435968);supported by the State of Washington through the University of Washington Clean Energy Institute 摘　　要：In the last two decades, a nano structuring paradigm has been successfully applied in a wide range of thermoelectric materials, resulting in significant reduction in thermal conductivity and superior thermoelectric performance. These advances, however, have been accomplished without directly investigating the local thermoelectric properties, even though local electric current can be mapped with high spatial resolution. In fact, there still lacks an effective method that links the macroscopic thermoelectric performance to the local micro structures and properties. Here, we show that local thermal conductivity can be mapped quantitatively with good accuracy, nanometer resolution and one-to-one correspondence to the micro structure using a three-phase skutterudite as a model system. Scanning thermal microscopy combined with finite element simulations demonstrate close correlation between sample conductivity and probe resistance,enabling us to distinguish thermal conductivities spanning orders of magnitude, yet resolving thermal variation across a phase interface with small contrast. The technique thus provides a powerful tool to correlate local thermal conductivities, micro structures and macroscopic properties for nano structured materials in general and nano structured thermo electrics in particular. 关 键 词：thermal conductivity scanning thermal microscopy thermoelectric materials nanoscale heat transfer thermal imaging
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