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

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

ASJC Scopus subject areas

  • Materials Science(all)

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