Four different graphene-based temperature sensors were prepared, and their temperature and humidity dependences were tested. Sensor active layers prepared from reduced graphene oxide (rGO) and graphene nanoplatelets (Gnp) were deposited on the substrate from a dispersion by air brush spray coating. Another sensor layer was made by graphene growth from a plasma discharge (Gpl). The last graphene layer was prepared by chemical vapor deposition (Gcvd) and then transferred onto the substrate. The structures of rGO, Gnp, and Gpl were studied by scanning electron microscopy. The obtained results confirmed the different structures of these materials. Energy-dispersive X-ray diffraction was used to determine the elemental composition of the materials. Gcvd was characterized by X-ray photoelectron spectroscopy. Elemental analysis showed different oxygen contents in the structures of the materials. Sensors with a small flake structure, i.e., rGO and Gnp, showed the highest change in resistance as a function of temperature. The temperature coefficient of resistance was 5.16−3·K−1 for Gnp and 4.86−3·K−1 for rGO. These values exceed that for a standard platinum thermistor. The Gpl and Gcvd sensors showed the least dependence on relative humidity, which is attributable to the number of oxygen groups in their structures.
With ongoing rapid development of printed and organic electronics, high attention is paid to studies of contact resistance, which is recognized as the crucial factor affecting the overall performance of devices based on organic semiconductors. This paper presents the combined analysis of contact resistance in metal-organic heterostructures based on simultaneous employment of both the conventional and the modified transfer length method (C-TLM, M-TLM).
Entwicklung einer Berechnungsmethode zur Beschreibung der thermo‐mechanischen Vorgänge beim Stranggießen. Verfahren zur Bestimmung der instationären Temperaturfelder und des Erstarrungsfortschrittes (Schalenwachstum). Beschreibung des temperaturabhängigen thermo‐visko‐elasto‐plastischen Materialverhaltens des Stahles im Hochtemperaturbereich. Methode zur Berechnung der zeitlichen Entwicklung der Deformations‐ und Spannungszustände im über die Stützrollen bewegten Strang, einschließlich der Wärmespannungen und deren Einfluß auf das Bulging‐Verhalten.
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