Ferrite‐based room temperature negative temperature coefficient printed thermistors
| Autor: | K.G.U. Wijayantha, Jack R. McGhee, P.S.A. Evans, Jagdeep S. Sagu, Darren J. Southee |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Fabrication Inkwell 020208 electrical & electronic engineering Thermistor Linearity 02 engineering and technology Screen printing 0202 electrical engineering electronic engineering information engineering Ferrite (magnet) Electrical and Electronic Engineering Composite material Temperature coefficient Curing (chemistry) |
| Zdroj: | Electronics Letters. 56:1322-1324 |
| ISSN: | 1350-911X 0013-5194 |
| DOI: | 10.1049/el.2020.2158 |
| Popis: | Two screen printing inks were developed for the low-temperature fabrication of printed and flexible thick film negative temperature coefficient (NTC) thermistors able to operate at room temperature. The first of the two screen printing inks developed utilised cobalt ferrite (CoFe2O4) as the temperature sensing material with the second ink incorporating manganese ferrite (MnFe2O4). These were then screen printed onto lithographically printed silver interdigitated electrodes with a 200-micron track and gap using a synthetic paper (Teslin) as the substrate. The inks required a 10-minute curing step at 80oC. Preannealing of the ferrite powders before ink formulation enabled the avoidance of high-temperature processing post-fabrication typically required in industrial thermistor production. The printed thermistors were tested at a controlled constant humidity between 15 and 50oC. Both materials demonstrated typical natural logarithmic responses with high linearity and sensitivity. |
| Databáze: | OpenAIRE |
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