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, similar to 100 nm thick) grown by chemical vapor deposition. The stability of these NGF heaters (operational in air over the range 30-300 degrees C) is demonstrated by a 12-day continuous heating test, at 215 degrees C. The NGF exhibits a fast switching response and attains a steady peak temperature of 300 degrees 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 pm-thick Pyrex glass vial and bringing S mL of water to a temperature of 96 degrees 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.

Flexible, Air-Stable, High-Performance Heaters Based on Nanoscale-Thick Graphite Films / Deokar, Geetanjali; Reguig, Abdeldjalil; Tripathi, Manoj; Buttner, Ulrich; Fina, Alberto; Dalton, Alan B.; Costa, Pedro M. F. J.. - In: ACS APPLIED MATERIALS & INTERFACES. - ISSN 1944-8244. - STAMPA. - 14:15(2022), pp. 17899-17910. [10.1021/acsami.1c23803]

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

Alberto Fina;
2022

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, similar to 100 nm thick) grown by chemical vapor deposition. The stability of these NGF heaters (operational in air over the range 30-300 degrees C) is demonstrated by a 12-day continuous heating test, at 215 degrees C. The NGF exhibits a fast switching response and attains a steady peak temperature of 300 degrees 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 pm-thick Pyrex glass vial and bringing S mL of water to a temperature of 96 degrees 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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2973576