Improved Aging Characteristics of NTC Thermistor Thin Films Fabricated by a Hybrid Sol-Gel-MOD Process

• Published in: Journal of the American Ceramic Society Vol. 89; no. 1; pp. 189 - 192
• Main Authors: Kukuruznyak, Dmitry A., Moyer, Jerome G., Ohuchi, Fumio S.
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Inc 01-01-2006; Blackwell; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Borosilicate; Conductivity; Conductors, resistors (including thermistors, varistors, and photoresistors); Electronic equipment and fabrication. Passive components, printed wiring boards, connectics; Electronics; Exact sciences and technology; Glass; Materials science; Nanocomposites; Nanostructured ceramics; Oxides; Sol gel process; Temperature; Tetraethyl orthosilicate; Thermistors; Thin films; Thermistor; Boron oxide; Ternary system; Ageing; Organometallic compound; Oxides; Experimental study; X ray diffraction; Precursor; Thin film; Improvement; Transmission electron microscopy; Sol gel process; Silicon oxides; Cobalt Copper Manganese Nickel Oxides Mixed; Manufacturing
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2005.00653.x

Negative temperature coefficient thermistor oxide thin films with improved aging characteristics are described. Better thermal stability has been achieved by incorporating sol–gel techniques with metallo‐organic decomposition methods. A compositional range was identified whereby borosilicate may incorporate into the thermistor oxides, forming nanocomposites showing thermistor electrical characteristics. Thermistor thin films, with composition Ni0.48Co0.24Cu0.6Mn1.68O4·0.22SiO2·0.15B2O3 were deposited onto glass substrates from a solution containing organic transition metal salts, tetraethyl orthosilicate and triethyl borate. Electrical resistance measurements verified characteristic thermistor behavior. Nanocomposite thin films exhibited a factor of four improvement as compared with pure oxides after aging at 150°C for 500 h.