Kondapalli Vamsi Krishna Reddy, Akinboye Oluwasegun Isaac, Zhang Yu, Donadey Guillaume, Morrow Justin, Brittingham Kyle, Raut Ayush Arun, Khosravifar Mahnoosh, Al-Riyami Bashar, Bahk Je-Hyeong, Shanov Vesselin
Department of Mechanical and Materials Engineering, University of Cincinnati, Cincinnati 45221, Ohio United States.
Unite de Formation de Chimie, University of Bordeaux, Talence 33405, Gironde France.
ACS Appl Mater Interfaces. 2024 Mar 13;16(10):13150-13160. doi: 10.1021/acsami.3c19605. Epub 2024 Mar 4.
Over the years, various processing techniques have been explored to synthesize three-dimensional graphene (3DG) composites with tunable properties for advanced applications. In this work, we have demonstrated a new procedure to join a 3D graphene sheet (3DGS) synthesized by chemical vapor deposition (CVD) with a commercially available carbon veil (CV) via cold rolling to create 3DGS-CV composites. Characterization techniques such as scanning electron microscopy (SEM), Raman mapping, X-ray diffraction (XRD), electrical resistance, tensile strength, and Seebeck coefficient measurements were performed to understand various properties of the 3DGS-CV composite. Extrusion of 3DGS into the pores of CV with multiple microinterfaces between 3DGS and the graphitic fibers of CV was observed, which was facilitated by cold rolling. The extruded 3D graphene revealed pristine-like behavior with no change in the shape of the Raman 2D peak and Seebeck coefficient. Thermoelectric (TE) power generation and photothermoelectric responses have been demonstrated with in-plane TE devices of various designs made of p-type 3DGS and n-type CV couples yielding a Seebeck coefficient of 32.5 μV K. Unlike various TE materials, 3DGS, CV, and the 3DGS-CV composite were very stable at high relative humidity. The 3DGS-CV composite revealed a thin, flexible profile, good moisture and thermal stability, and scalability for fabrication. These qualities allowed it to be successfully tested for temperature monitoring of a Li-ion battery during charging cycles and for large-area temperature mapping.
多年来，人们探索了各种加工技术来合成具有可调特性的三维石墨烯（3DG）复合材料，以用于先进应用。在这项工作中，我们展示了一种新方法，通过冷轧将化学气相沉积（CVD）合成的三维石墨烯片（3DGS）与市售碳毡（CV）结合，以制备3DGS-CV复合材料。通过扫描电子显微镜（SEM）、拉曼映射、X射线衍射（XRD）、电阻、拉伸强度和塞贝克系数测量等表征技术来了解3DGS-CV复合材料的各种性能。观察到3DGS被挤压到CV的孔隙中，3DGS与CV的石墨纤维之间存在多个微界面，这一过程通过冷轧得以促进。挤压后的三维石墨烯呈现出类似原始状态的行为，拉曼2D峰的形状和塞贝克系数均未改变。利用由p型3DGS和n型CV对制成的各种平面热电（TE）器件展示了热电发电和光热发电响应，其塞贝克系数为32.5 μV K。与各种TE材料不同，3DGS、CV和3DGS-CV复合材料在高相对湿度下非常稳定。3DGS-CV复合材料呈现出薄而柔韧的外形、良好的防潮性和热稳定性以及可扩展的制造性。这些特性使其能够成功地用于锂离子电池充电循环期间的温度监测以及大面积温度测绘。
