石墨烯

Abstract(#br)Superoleophilic graphene–nickel foam (PDMS–G–NF), which was prepared by coating graphene nanosheets onto nickel foam followed by surface modification with polydimethylsiloxane (PDMS), was used as porous supporting material to prepare form-stable phase change materials (PCMs) composites. Owing to the strong hydrophobic and superhydrophilic wettability of PDMS–G–NF, PCMs can be absorbed spontaneously into PDMS–G–NF and can stay stable without leakage even over their melting points.

Abstract(#br)Graphene has been attracting great attention from scientific community due to its astonishing mechanical, optical, and electrical properties, especially, graphene films synthesized by chemical vapor deposition (CVD) method are large, uniform and high-quality. CVD-grown graphene films have been successfully transferred onto various kinds of substrates such as SiO 2 /Si, quartz, PET, and plastics. However, graphene transfer onto polydimethylsiloxane (PDMS) substrates for device development has been limited due to the very low surface energy of PDMS.

Abstract(#br)Graphene was produced either by chemical reduction of graphene oxide (GO) using hydrazine hydrate (HG)/sodium borohydride (BG) or by straight electrochemically exfoliation of graphite (EG). The X-ray diffraction and Raman spectroscopy confirmed smaller in-plane crystalline sizes for the chemically produced graphenes, and more number of layers and therefore lower structural defects for the EG sample.(#br)The graphene samples were used to prepare polydimethylsiloxane (PDMS)–graphene (G)/polyethersulfone (PES) hybrid membranes to investigate their pervaporative performances.

摘要 本论文研究了石墨烯纳米片( GNP )与双链DNA的纳米复合材料作为紫外光敏材料，由于其具有良好的电学性能，同时结合DNA对紫外光的化学敏感性，特别是对能量较高的UV-C波段。在柔性聚二甲基硅氧烷( PDMS )基体中嵌入石墨烯-DNA填料，采用滴注法制备纳米复合膜。由于纳米复合材料的传感性能受填料分散量和均匀性的影响较大，为了提高石墨烯- DNA元素在聚合物基体中的分散性，对其合成工艺进行了优化。采用互补技术研究了GNP-DNA / PDMS薄膜在UV-C辐射前后的电学、热学性能以及表面形貌和润湿性。研究结果揭示了这些新型功能纳米复合材料在高致命紫外辐射环境中的潜在应用。

Abstract(#br)Flexible and stretchable multifunctional electronics is expected to be one of the most active research areas in the next decade. In this work, we fabricate graphene based flexible film sensors using two different matrices; polydimethylsiloxane (PDMS) and epoxy. A graphene platelet (GnP) refers to a nanosheet that consists of a few stacked graphene layers, mostly below ~ 10 nm in thickness . The mechanical, electrical and thermal properties of the fabricated composite films were evaluated. The morphology showed a good dispersibility of GnPs into the PDMS and epoxy matrices.

We report a facile and efficient method to transfer the graphene from a metal substrate to a polymer without removal of the metal substrate. Multilayer graphene was synthesized on a Co substrate, and liquid polydimethylsiloxane (PDMS) was prepared using various curing agent ratios. The quantity of graphene transferred to the cured PDMS could be controlled by the mixing ratio of the curing agent. We produced monolayer graphene on a metal substrate and controlled the transfer of graphene layers to PDMS.

Improvement of PDMS graphene transfer method through surface modification of target substrategraphene;dry transfer method;surface modification;polydimethylsiloxane;surface energy;In this paper, we study the dry transfer technology utilizing PDMS (Polydimethylsiloxane) stamp of a large single-layer graphene grown on Cu-foil as catalytic metal by using Chemical Vapor Deposition (CVD). By changing the surface property of the target substrate through $UV/O_3$ treatment, we can transfer the graphene on the target substrate while minimizing mechanical damages of graphene layer.

Abstract(#br)In order to realize a flexible visible-near-infrared (VIS-NIR) photodetector, Si nanowires (SiNWs) were prepared on graphene (Gr) by using metal-catalyzed chemical vapor deposition, and then the Gr/SiNWs heterojunction was transferred onto a flexible polytetrafluoroethylene (PTFE) substrate by using a polymethylmethacrylate (PMMA)/polydimethylsiloxane (PDMS) as a double-layer support film. The transfer process of the flexible Gr/SiNWs heterojunction was successful.

Novel silicone-based nanocomposites with varied elastic properties were prepared by blending standard polydimethylsiloxane (PDMS) with a lower viscosity component (hydroxyl-terminated PDMS) and integrating a graphene nanoplatelets (GNP) filler modified by strands of deoxyribonucleic acid (DNA). The curing behavior of these nanocomposites was studied by dynamic and isothermal differential scanning calorimetry.

在本研究中，我们制备并评价了石墨烯复合材料的三维支架和平面薄膜。将计算量的石墨烯纳米粉体与聚二甲基硅氧烷在四氢呋喃溶液中混合，制备了混杂复合材料。混合复合材料易于采用直接印刷技术或压制方法制造成各种形式。在室温下，以240 mm / min的流速制备了三维支架结构。通过调节复合材料的黏度，喷嘴压力保持在350 kPa。利用辊对辊设备制备了不同厚度的平面薄膜。对制备的杂化纳米复合材料进行评价，根据温度和机械变形考察其电学性能。所得结果一致。因此，可以通过形状定义有效地作为传感器使用。