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Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
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Three-Dimensional Graphene Sheet-Carbon Veil Thermoelectric Composite with Microinterfaces for Energy Applications.

Vamsi Krishna Reddy Kondapalli1, Oluwasegun Isaac Akinboye1, Yu Zhang1

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Summary

Researchers developed a new 3D graphene sheet (3DGS) and carbon veil (CV) composite using cold rolling. This flexible, stable material shows promise for thermoelectric power generation and temperature monitoring applications.

Keywords:
3D graphene sheetcarbon veilcold rollingflexible thermoelectricphotothermoelectricthermocouples

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Harvesting

Background:

  • Three-dimensional graphene (3DG) composites offer tunable properties for advanced applications.
  • Current synthesis methods for 3DG composites are diverse, with ongoing research into optimizing their performance and fabrication.

Purpose of the Study:

  • To develop a novel method for creating 3D graphene sheet (3DGS) and carbon veil (CV) composites (3DGS-CV).
  • To characterize the structural, electrical, and thermoelectric properties of the new 3DGS-CV composite.
  • To demonstrate the potential applications of the 3DGS-CV composite in thermoelectric power generation and temperature monitoring.

Main Methods:

  • Synthesis of 3D graphene sheets (3DGS) via chemical vapor deposition (CVD).
  • Fabrication of 3DGS-CV composites by joining 3DGS with commercial carbon veil (CV) using cold rolling.
  • Comprehensive characterization including SEM, Raman mapping, XRD, electrical resistance, tensile strength, and Seebeck coefficient measurements.

Main Results:

  • Cold rolling facilitated the extrusion of 3DGS into CV pores, creating microinterfaces.
  • The extruded 3D graphene maintained its pristine-like characteristics, evidenced by unchanged Raman 2D peak and Seebeck coefficient.
  • In-plane thermoelectric devices utilizing p-type 3DGS and n-type CV couples achieved a Seebeck coefficient of 32.5 μV K-1.
  • The 3DGS-CV composite exhibited excellent stability in high relative humidity, unlike many other thermoelectric materials.
  • The composite demonstrated a thin, flexible profile with good moisture and thermal stability, suitable for scalable fabrication.

Conclusions:

  • The developed cold rolling technique offers a scalable method for producing 3DGS-CV composites with desirable properties.
  • The 3DGS-CV composite shows significant potential for thermoelectric power generation due to its tunable properties and stability.
  • The material's flexibility, stability, and ease of fabrication make it suitable for practical applications such as temperature monitoring in Li-ion batteries and large-area temperature mapping.