Inexpensive Graphene Oxide Heaters Lithographed by Laser
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AuthorRomero Mora, Francisco Javier; Rivadeneyra Torres, Almudena; Ortiz Gómez, Inmaculada; Salinas Castillo, Alfonso; Godoy Medina, Andrés; Morales Santos, Diego Pedro; Rodríguez Santiago, Noel
Flexible electronicsGraphene oxideLaser-scribingThermal response
Romero, F. J., Rivadeneyra, A., Ortiz-Gomez, I., Salinas, A., Godoy, A., Morales, D. P., & Rodriguez, N. (2019). Inexpensive Graphene Oxide Heaters Lithographed by Laser. Nanomaterials, 9(9), 1184.
SponsorshipThis work has been supported by the Spanish Ministry of Education, Culture and Sport (MECD)/FEDER-EU through the project TEC2017-89955-P and the predoctoral grant FPU16/01451; by the European Commission through the fellowship H2020-MSCA-IF-2017-794885-SELFSENS and by Iberdrola Foundation under its 2018 Research Grant Program.
In this paper, we present a simple and inexpensive method for the fabrication of high-performance graphene-based heaters on different large-scale substrates through the laser photothermal reduction of graphene oxide (laser-reduced graphene-oxide, LrGO). This method allows an efficient and localized high level of reduction and therefore a good electrical conductivity of the treated films. The performance of the heaters is studied in terms of steady-state temperature, power consumption, and time response for different substrates and sizes. The results show that the LrGO heaters can achieve stable steady-state temperatures higher than 200 ºC when a voltage of 15 V is applied, featuring a time constant of around 4 s and a heat transfer coefficient of ~200 ºC cm2/W. These characteristics are compared with other technologies in this field, demonstrating that the fabrication approach described in this work is competitive and promising to fabricate large-scale flexible heaters with a very fast response and high steady-state temperatures in a cost-effective way. This technology can be easily combined with other fabrication methods, such as screen printing or spray-deposition, for the manufacturing of complete sensing systems where the temperature control is required to adjust functionalities or to tune sensitivity or selectivity.