LaNiO3 conducting particle dispersed NiMn2O4 nanocomposite NTC thermistor thick films by aerosol deposition

Nickel manganite spinel (NiMn2O4) based negative temperature coefficient (NTC) thermistors have good thermistor characteristics and stabilities. However, to achieve thermistors with a high B constant, the activation energy should be high, which results in high room temperature (RT) resistivity. To obtain a high B constant and low RT resistivity, NiMn2O4 based nanocomposite thick films with the conducting metal oxide, LaNiO3, were fabricated on a glass substrate by aerosol deposition at room temperature. The NiMn2O4–LaNiO3 nanocomposite thick films showed an RT resistivity as low as 35 kΩ cm, which is one order of magnitude lower than that of the NiMn2O4 films, while retaining the high B constant of NiMn2O4 of over 5000 K when 25 vol.% LaNiO3 was used without any post thermal treatment.

► RT fabrication of NTC nanocomposite films with conducting oxide particles.
► 25 vol.% LNO showed high B constant and low resistivity.
► B constant was over 5000 K and resistivity was one order lower.