acsami.1c23803 accepted.pdf (5.83 MB)
Flexible, air-stable, high-performance heaters based on nanoscale thick graphite films
journal contribution
posted on 2023-06-10, 03:00 authored by Geetanjali Deokar, Abdeldjalil Reguig, Manoj TripathiManoj Tripathi, Ulrich Buttner, Alberto Fina, Alan DaltonAlan Dalton, Pedro M F J CostaGraphite 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 cm2-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/cm2). 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/cm2). Overall, the NGF could become an excellent active material for ultrathin, flexible, and sustainable heating panels that operate at low power.
History
Publication status
- Published
File Version
- Accepted version
Journal
ACS Applied Materials and InterfacesISSN
1944-8244Publisher
American Chemical SocietyExternal DOI
Department affiliated with
- Physics and Astronomy Publications
Research groups affiliated with
- Materials Physics Group Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2022-03-28First Open Access (FOA) Date
2023-04-01First Compliant Deposit (FCD) Date
2022-03-28Usage metrics
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