Thermal Treatment of Aerosol Deposited NiMn₂O₄ NTC Thermistors for Improved Aging Stability

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Schubert, Michaela ; Münch, Christian ; Schuurman, Sophie ; Poulain, Veronique ; Kita, Jaroslaw ; Moos, Ralf:
Thermal Treatment of Aerosol Deposited NiMn₂O₄ NTC Thermistors for Improved Aging Stability.
In: Sensors. Vol. 18 (2018) Issue 11 . - No. 3982.
ISSN 1424-8220
DOI: https://doi.org/10.3390/s18113982

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This paper examines the influence of a short-term thermal treatment of aerosol deposited negative temperature coefficient (NTC) thermistor films on the NTCR characteristics and their long-term stability with different electrode materials. An aerosol deposition of a spinel-based NiMn2O4 powder on alumina substrates with screen-printed AgPd and Au interdigital electrode structures was performed. The manufactured components of the typical size of 1206 were tempered in a moderate temperature range of 200°C to 800°C and aged for 1000 h at 125°C in air. Based on R-T measurements in a high-precision silicone oil thermostat bath and high temperature XRD analyses, the influence of the thermal treatment was analyzed and discussed. A 60-min tempering at 400°C proved to be optimal, as both the NTCR parameters and their ageing stability could be significantly improved. The findings are explained.