Enhanced Thermoelectric Conversion Efficiency of CVD Graphene with Reduced Grain Sizes

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ID: 44502
2018
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Overall Quality Improving Quality
81.7 /100
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AI Quality Assessment 🥈 High Quality
83.1 /100
Academic Rigor 88.0%
Novelty 78.0%
Clarity 85.0%
Key Strengths
  • Well-defined experimental setup
  • Clear presentation of results
  • Demonstrated control over graphene grain size
Areas for Improvement
  • Limited discussion of long-term stability of graphene
  • Potential for more in-depth analysis of grain boundary effects
  • The study could benefit from comparison with other thermoelectric materials
AI Recommendations

Consider adding a section discussing the long-term stability of the graphene samples under different operating conditions. Further exploration of the impact of grain boundaries on thermoelectric performance could enhance the study. A comparative analysis with other thermoelectric materials would provide valuable context.

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75%
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Abstract
The grain size of CVD (Chemical Vapor Deposition) graphene was controlled by changing the precursor gas flow rates, operation temperature, and chamber pressure. Graphene of average grain sizes of 4.1 µm, 2.2 µm, and 0.5 µm was synthesized in high quality and full coverage. The possibility to tailor the thermoelectric conversion characteristics of graphene has been exhibited by examining the grain size effect on the three elementary thermal and electrical properties of σ, S, and k. Electrical conductivity (σ) and Seebeck coefficients (S) were measured in a vacuum for supported graphene on SiO2/Si FET (Field Effect Transistor) substrates so that the charge carrier density could be changed by applying a gate voltage (VG). Mobility (µ) values of 529, 459, and 314 cm2/V·s for holes and 1042, 745, and 490 cm2/V·s for electrons for the three grain sizes of 4.1 µm, 2.2 µm, and 0.5 µm, respectively, were obtained from the slopes of the measured σ vs. VG graphs. The power factor (PF), the electrical portion of the thermoelectric figure of merit (ZT), decreased by about one half as the grain size was decreased, while the thermal conductivity (k) decreased by one quarter for the same grain decrease. Finally, the resulting ZT increased more than two times when the grain size was reduced from 4.1 µm to 0.5 µm.
Reference Key
lim2018enhancednanomaterials Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Lim, Gyumin;Kihm, Kenneth David;Kim, Hong Goo;Lee, Woorim;Lee, Woomin;Pyun, Kyung Rok;Cheon, Sosan;Lee, Phillip;Min, Jin Young;Ko, Seung Hwan;
Journal Nanomaterials
Year 2018
DOI
10.3390/nano8070557
URL
http://www.mdpi.com/2079-4991/8/7/557
Keywords
chemistry microscopy Engineering (General). Civil engineering (General) Technology Electrical engineering. Electronics. Nuclear engineering Descriptive and experimental mechanics electronics

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