Abstract
Amorphous carbon nitride (a-CNx) films are well-known coating materials that provide excellent mechanical and chemical properties such as a low friction coefficient, high wear resistance, high hardness, low chemical inertness, and biocompatibility. Based on initial theoretical results, a-CNx was found to possess impressive properties such as a large bulk modulus of crystalline carbon nitride than that of the diamond. Apart from the mechanical properties, in recent years, unique electrical and optical properties of the a-CNx film have been reported. These properties include deformation under visible-light illumination, tunable bandgap, and photoconductivity. In this chapter, electrical properties of a-CNx films corresponding to the ambient pressure and gas species are presented. By conducting I-V measurements in a vacuum chamber, it was revealed that the electrical resistance value of the a-CNx film prepared via reactive sputtering fluctuates with changes in ambient pressure. The fluctuation range varies with gas species of N2, O2, CO2, and Ar. The gas sensitivity of approximately 3 % is obtained from an exposure area of 0.03 mm2. Based on these results, an economical small pressure sensor fabricated using a-CNx films is proposed.
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Aono, M., Tamura, N. (2017). Electrical Properties of Amorphous Carbon Nitride Thin Films for Pressure Sensor Applications. In: Kaneko, S., et al. Carbon-related Materials in Recognition of Nobel Lectures by Prof. Akira Suzuki in ICCE. Springer, Cham. https://doi.org/10.1007/978-3-319-61651-3_11
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