Nickel oxide coated carbon nanoparticles as temperature sensing materials
Journal
Materials Chemistry and Physics
Journal Volume
148
Journal Issue
1-2
Pages
305-310
Date Issued
2014
Author(s)
Abstract
In this research, carbon black nanoparticles were coated with nickel oxide chemically to prepare composite materials with a large temperature coefficient of resistance (TCR) and low resistivity for thermistor applications. Carbon black (CB) nanoparticles were first suspended in aqueous nickel chloride solution. After titrating with sodium hydroxide, nickel hydroxide was chemically depositing onto carbon black nanoparticles. The precipitates were filtered, collected, and calcined at 300 °C to generate NiO/CB composites. The XRD results for the NiO/CB composites showed distinct NiO crystalline structures with an average grain size of 12 nm. Surface morphology of prepared elements was also examined with SEM to show that the CB particles were coated by NiO. The electrical resistivity of the composite NiO/CB material follows Arrhenius relation with activation energy of 0.38 eV in the range of 50-200°C and possesses a high temperature sensitivity with B-values more than 4000 K.
Type
journal article