Flexible, Air-Stable, High-Performance Heaters Based on Nanoscale-Thick Graphite Films

Geetanjali Deokar, Abdeldjalil Reguig, Manoj Tripathi, Ulrich Buttner, Alberto Fina, Alan B. Dalton, Pedro M. F. J. Da Costa

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Graphite sheets are known to exhibit remarkable performance in applications such as heating panels and critical elements of thermal management systems. Industrial-scale production of graphite films relies on high-temperature treatment of polymers or calendering of graphite flakes; however, these methods are limited to obtaining micrometer-scale thicknesses. Herein, we report the fabrication of a flexible and power-efficient cm$^{2}$-scaled heater based on a polycrystalline nanoscale-thick graphite film (NGF, ∼100 nm thick) grown by chemical vapor deposition. The stability of these NGF heaters (operational in air over the range 30-300 °C) is demonstrated by a 12-day continuous heating test, at 215 °C. The NGF exhibits a fast switching response and attains a steady peak temperature of 300 °C at a driving bias of 7.8 V (power density of 1.1 W/cm$^{2}$). This excellent heating performance is attributed to the structural characteristics of the NGF, which contains well-distributed wrinkles and micrometer-wide few-layer graphene domains (characterized using conductive imaging and finite element methods, respectively). The efficiency and flexibility of the NGF device are exemplified by externally heating a 2000 μm-thick Pyrex glass vial and bringing 5 mL of water to a temperature of 96 °C (at 2.4 W/cm$^{2}$). Overall, the NGF could become an excellent active material for ultrathin, flexible, and sustainable heating panels that operate at low power.
Original languageEnglish (US)
JournalACS Applied Materials & Interfaces
DOIs
StatePublished - Mar 31 2022

Bibliographical note

KAUST Repository Item: Exported on 2022-04-05
Acknowledged KAUST grant number(s): BAS/1/1346-01-01
Acknowledgements: G.D. is grateful to Prof. Omar Mohammed from KAUST for guidance and discussion. The figures in TOC, Figures 2a, 3a, and 5b, and Figure S9 were illustrated by Antonio Garcia, a scientific illustrator. A.F. acknowledges Mr. Fausto Franchini at Politecnico di Torino for helpful discussion. M.T. and A.B.D. were financially supported by the University of Sussex strategic development fund. The authors acknowledge the KAUST Core Labs teams for the technical support. This research work was funded by KAUST (BAS/1/1346-01-01).

ASJC Scopus subject areas

  • General Materials Science

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