Thermoelectric characterization of nickel-nanowires and nanoparticles embedded in silica aerogels
Thermoelectric characterization of nickel-nanowires and nanoparticles embedded in silica aerogels
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DOI：
10.1063/1.5027889
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发表时间：
2018-06-01
期刊：
影响因子：
1.6
通讯作者：
Olsen, Sarah H.
中科院分区：
文献类型：
--
作者：
Ghaderi, Sherko;Hassan, Khalil T.;Olsen, Sarah H.
嵌入式镍纳米线（NINWS）和镍纳米颗粒（NINPS）以三种不同浓度的二氧化硅气凝胶中的含量，具有扫描热显微镜，热盘方法和四个探针测量，以将它们视为潜在的热电材料。 NINW样品显示出9个数量级的绩效数量提高，而嵌入式NINPS样品显示浓度从0 ppm增加到700 ppm时，嵌入式NINPS样品显示出6个数量级的提高。 The electrical resistivity is highly sensitive to the concentration of NiNWs and NiNPs in the silica aerogels, while the thermal conductivity remains largely unchanged over temperature range 300 to 420 K. The electrical conductivity sigma follows a percolation scaling law of the form sigma proportional to (W - W-c)(t) with critical weight fraction (W-c) to form a conductive network at range 0.04-0.06嵌入式NINW和NINP的WT％和0.08-0.1 wt％。该研究表明，气凝胶中纳米材料浓度的进一步优化可以产生有希望的热电特性。 （c）2018年作者。
Embedded nickel nanowires (NiNWs) and nickel nanoparticles (NiNPs) in silica aerogels at three different concentrations are characterized by scanning thermal microscopy, a Hot disk method and four probe measurements to consider them as potential thermoelectric materials. NiNW samples exhibit 9 orders of magnitude improvement in thermoelectric figure of merit while the embedded NiNPs samples show a 6 orders of magnitude improvement when the concentrations are increased from 0 to 700 ppm. The electrical resistivity is highly sensitive to the concentration of NiNWs and NiNPs in the silica aerogels, while the thermal conductivity remains largely unchanged over temperature range 300 to 420 K. The electrical conductivity sigma follows a percolation scaling law of the form sigma proportional to (W - W-c)(t) with critical weight fraction (W-c) to form a conductive network at range 0.04-0.06 Wt% and 0.08-0.1 Wt% for embedded NiNWs and NiNPs, respectively. The investigation suggest that further optimization of the concentration of nanomaterials in aerogels could yield promising thermoelectric properties. (C) 2018 Author(s).