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首页> 外文会议>Nanostructured metal oxides for advanced applications >Fabrication and Characterization of Antimony Tin Oxide Nanoparticle Networks Inside Polystyrene
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Fabrication and Characterization of Antimony Tin Oxide Nanoparticle Networks Inside Polystyrene

机译：聚苯乙烯内部氧化锑锡纳米粒子网络的制备与表征

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Recently, there has been much interest in the creation of 3D networks of nanowires. One possible way to do this is to encase the nanowires inside transparent polymer matrices since there is also a demand for obtaining conducting transparent composites. If the filler of the composite is made from a strongly conducting material, the degree of connectivity of the networked nanowires can be tested by measuring its conductivity. Though much work has been done with ITO (Tin-doped indium oxide), little has been done with the chemically similar, but cheaper, ATO (Antimony-doped tin oxide). In this study, ATO nanoparticles were added into a polystyrene matrix and simultaneously pressed and heated so that a 3D network of the nanoparticles would form. The effecti veness of the conducting pseudo-nanowire networks was measured as the concentration of ATO in polystyrene was varied. Another variable utilized was the temperature at which the samples were pressed. The optical transmittance of the composites was also measured in order to quantify their transparency. It was found that, once the nanowire networks had percolated at a concentration of about 1.25 PHR, the conductivity and, consequently, the coherence of the networks increased at a decreasing rate as the concentration was increased. The effect of the pressing temperature was complex and required many additional sets of specimens to understand. Samples pressed at the highest temperature had the least coherent networks, as the polystyrene became too fluid and disrupted the ATO networks while at lower temperatures the opposite occurred. The optical transmittance dropped sharply as the concentration of ATO reached and surpassed 1.0 PHR. Nanowire networks were, indeed, formed through this process using these materials, but use as a conducting transparent composite in the visible range is unlikely as the percolation threshold occurs at a concentration greater than that of the optical transmittance drop, creating a trade-off between conductivity and transparency. The resistivity did drop as much as six orders of magnitude and may be useful for other applications.
机译：近来，人们对纳米线的3D网络的创建非常感兴趣。一种实现此目的的可能方法是将纳米线包裹在透明聚合物基质中，因为还需要获得导电的透明复合材料。如果复合材料的填充物是由强导电材料制成的，则可以通过测量其导电性来测试网状纳米线的连接程度。尽管在ITO（掺锡的氧化铟）方面已做了大量工作，但在化学上相似但价格便宜的ATO（掺锑的氧化锡）方面却做得很少。在这项研究中，将ATO纳米颗粒添加到聚苯乙烯基质中，同时对其进行加压和加热，以形成纳米颗粒的3D网络。随着聚苯乙烯中ATO浓度的变化，测量了导电拟纳米线网络的有效性。所利用的另一个变量是压制样品的温度。还测量了复合材料的透光率，以量化其透明度。已经发现，一旦纳米线网络以约1.25PHR的浓度渗透，则电导率以及因此网络的相干性随着浓度的增加而以降低的速率增加。压制温度的影响是复杂的，需要了解更多的标本集。在最高温度下压制的样品具有最不紧密的网络，因为聚苯乙烯变得太易流动并破坏了ATO网络，而在较低温度下相反。随着ATO的浓度达到并超过1.0PHR，光透射率急剧下降。实际上，纳米线网络是通过使用这些材料的此过程形成的，但由于渗透阈值的浓度大于光透射率下降的浓度，因此不可能在可见光范围内用作导电透明复合材料，从而在两者之间进行权衡导电性和透明度。电阻率的确下降了六个数量级，可能对其他应用有用。

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    Ryan J. Gussenhoven; Rosario A. Gerhardt;

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    School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Drive, Atlanta, GA 30332-0245;

    School of Materials Science and Engineering Georgia Institute of Technology 771 Ferst Drive, Atlanta, GA 30332-0245;

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