High-temperature planar heating elements using RuO2 nanosheets

Abstract

Planar heating elements employ carbon nanotubes, graphene, and metals. However, the high-temperature (300–500 °C) applications of heating elements based on metallic and organic materials are limited because they oxidize at high temperatures. Oxide materials such as RuO2 are promising alternatives. The electrical conductivity of heating elements are strongly dependent on the aspect ratios of fillers; thus, RuO2 nanosheets are suitable fillers for high-temperature planar heating elements because RuO2 remains stable at high temperatures, and RuO2 nanosheets have high aspect ratios of over 1000, as the lateral sizes and thicknesses of the RuO2 nanosheets are 2∼5 μm and 1–3 nm, respectively. Consequently, the electrical conductivity of planar heating elements using RuO2 nanosheets as fillers is 940 times higher than that of heating elements using conventional granular RuO2 nanoparticles. Therefore, the RuO2 nanosheet-based heating elements will be suitable in various applications requiring high temperatures and high uniformity. © 2024 The Authors