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Open AccessArticle

Thermoresistive Properties of Graphite Platelet Films Supported by Different Substrates

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Institute for Polymers, Composites and Biomaterials—National Research Council (IPCB-CNR). SS Napoli/Portici, Piazzale E. Fermi, 1-80055 Portici (NA), Italy
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Department of Physics ‘E.R.Caianello’, University of Salerno, Via Giovanni Paolo II, 132—84084 Fisciano (SA), Italy
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Superconducting and Other Innovative Materials and Devices Institute—National Research Council (SPIN-CNR), Via Giovanni Paolo II, 132—84084 Fisciano (SA), Italy
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Department SIMAU, Polytechnic University of Marche, Via Brecce Bianche, I-60131 Ancona, Italy
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Department of Applied Science and Technology, Politecnico di Torino. Corso Duca degli Abruzzi, 24, 10129 Torino, Italy
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Department of Physics ‘Ettore Pancini’, University of Naples ‘Federico II’, Via Cintia, I-80126 Napoli, Italy
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CNISM, Naples Unit, Via Cintia, I-80126 Napoli, Italy
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(21), 3638; https://doi.org/10.3390/ma12213638
Received: 6 October 2019 / Revised: 30 October 2019 / Accepted: 2 November 2019 / Published: 5 November 2019
(This article belongs to the Special Issue Carbon-Based Materials)
Large-area graphitic films, produced by an advantageous technique based on spraying a graphite lacquer on glass and low-density polyethylene (LDPE) substrates were studied for their thermoresistive applications. The spray technique uniformly covered the surface of the substrate by graphite platelet (GP) unities, which have a tendency to align parallel to the interfacial plane. Transmission electron microscopy analysis showed that the deposited films were composed of overlapped graphite platelets of different thickness, ranging from a few tens to hundreds of graphene layers, and Raman measurements provided evidence for a good graphitic quality of the material. The GP films deposited on glass and LDPE substrates exhibited different thermoresistive properties during cooling–heating cycles in the −40 to +40 °C range. Indeed, negative values of the temperature coefficient of resistance, ranging from −4 × 10−4 to −7 × 10−4 °C−1 have been observed on glass substrates, while positive values varying between 4 × 10−3 and 8 × 10−3 °C−1 were measured when the films were supported by LDPE. These behaviors were attributed to the different thermal expansion coefficients of the substrates. The appreciable thermoresistive properties of the graphite platelet films on LDPE could be useful for plastic electronic applications. View Full-Text
Keywords: graphite platelet coatings; LDPE; thermal expansion coefficient; thermoresistive properties graphite platelet coatings; LDPE; thermal expansion coefficient; thermoresistive properties
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MDPI and ACS Style

Palomba, M.; Carotenuto, G.; Longo, A.; Sorrentino, A.; Di Bartolomeo, A.; Iemmo, L.; Urban, F.; Giubileo, F.; Barucca, G.; Rovere, M.; Tagliaferro, A.; Ambrosone, G.; Coscia, U. Thermoresistive Properties of Graphite Platelet Films Supported by Different Substrates. Materials 2019, 12, 3638.

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