Strongly Anisotropic Thermal Conductivity of Free‐Standing Reduced Graphene Oxide Films Annealed at High Temperature

By J. Renteria, S. Ramirez, H. Malekpour, B. Alonso, A. Centeno, A. Zurutuza, Alexandr I. Cocemasov, Denis L. Nika, Alexander A. Balandin. 2015

510 citations recorded by the source corpus.

Thermal conductivity of free‐standing reduced graphene oxide films subjected to a high‐temperature treatment of up to 1000 °C is investigated. It is found that the high‐temperature annealing dramatically increases the in‐plane thermal conductivity, K, of the films from ≈3 to ≈61 W m−1 K−1 at room temperature. The cross‐plane thermal conductivity, K⊥, reveals an interesting opposite trend of decreasing to a very small value of ≈0.09 W m−1 K−1 in the reduced graphene oxide films annealed at 1000 °C. The obtained films demonstrate an exceptionally strong anisotropy of the thermal conductivity, K/K⊥ ≈ 675, which is substantially larger even than in the high‐quality graphite. The electrical resistivity of the annealed films reduces to 1–19 Ω □−1. The observed modifications of the in‐plane and cross‐plane thermal conductivity components resulting in an unusual K/K⊥ anisotropy are explained theoretically. The theoretical analysis suggests that K can reach as high as ≈500 W m−1 K−1 with the increase in the sp2 domain size and further reduction of the oxygen content. The strongly anisotropic heat conduction properties of these films can be useful for applications in thermal management.

Subfields: Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/a0be132982b456147e140edbdf19acfd825031b4

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Civil and Structural Engineering

1. Alexander A. Balandin
2. Bin Liu
3. A. McGaughey
4. M. Kaviany

In Materials Chemistry

1. Hui‐Ming Cheng
2. Feiyu Kang
3. Bilu Liu
4. Jiaman Liu
5. Junqiao Wu
6. Houfu Song
7. Xiangfan Xu
8. Johan Liu

Citations in the corpus

• Two-Dimensional Materials for Thermal Management Applications (2018, background): “Thermal conductivity of the graphene film is effectively dependent on the sheet size of GO(182,183) and its reduction process.(184,185) Kumar et al.”
• Graphene related materials for thermal management (2019, methodology): “The application of this technique is not limited to quasi2D materials, and has been extended to relatively thick films [90, 113].”
• Effects of nanoparticle-enhanced phase change material (NPCM) on solar still productivity (2018, background): “The literature suggests that the amorphous state 229 can be converted to crystalline by annealing graphene oxide at >1000OC, but this transforms 230 GO to graphene (Pei and Cheng, 2011; Renteria et al., 2015; Sheng et al., 2011; Zhao et al., 231 2012).”