Layer-by-Layer Assembly and UV Photoreduction of Graphene-Polyoxometalate Composite Films for Electronics
Layer-by-Layer Assembly and UV Photoreduction of Graphene-Polyoxometalate Composite Films for Electronics
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DOI：
10.1021/ja201594k
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发表时间：
2011-06-22
影响因子：
15
通讯作者：
Bubeck, Christoph
中科院分区：
文献类型：
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作者：
Li, Haolong;Pang, Shuping;Bubeck, Christoph
氧化石墨烯（GO）纳米片和多金属氧酸盐簇H3PW12O40 （PW）。通过静电逐层组装将其组装成多层薄膜。在紫外线照射下，由于PW簇的光催化活性，在膜中发生光还原反应，将GO转化为还原GO （rGO）。通过这种方法，可以在石英、硅和塑料等各种衬底上精确控制厚度，制备均匀、大面积的基于氧化石墨烯的复合薄膜。我们进一步在复合薄膜的基础上制备了场效应晶体管，具有典型的双极性特性和良好的空穴和电子输运特性。晶体管的开/关比和载流子迁移率取决于沉积层的数量，并且易于控制。此外，我们使用光罩在薄膜上产生rGO域的导电图案，作为光电探测器器件的有效微电极。
Graphene oxide (GO) nanosheets and polyoxometalate clusters, H3PW12O40 (PW)., were co-assembled into multilayer films via electrostatic layer-by-layer assembly. Under UV irradiation, a photoreduction reaction took place in the films which converted GO to reduced GO (rGO) due to the photocatalytic activity of PW clusters. By this means, uniform and large-area composite films based on rGO were fabricated with precisely controlled thickness on various substrates such as quartz, silicon, and plastic supports. We further fabricated field effect transistors based on the composite films, which exhibited typical ambipolar features and good transport properties for both holes and electrons. The on/off ratios and the charge carrier mobilities of the transistors depend on the number of deposited layers and can be controlled easily. Furthermore, we used photomasks to produce conductive patterns of rGO domains on the films, which served as efficient microelectrodes for photodetector devices.