Volume air flow sensors based on NTC thick film segmented thermistors

Purpose - The aim of this paper is to investigate the behavior of a new nanometric particle NTC thermistor paste and thick films obtained by screen printing.Design methodology approach - Nanometric powder of NTC thermistors based on complex spinel was made by calcination of an oxide mixture and ultr...

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Bibliographic Details
Published in:Microelectronics international 2006-09, Vol.23 (3), p.14-18
Main Authors: Aleksi Obrad, S, Pantelija, Nikoli M, Konstantinos, Paraskevopoulos M
Format: Article
Language:English
Subjects:
Air flow
Analog circuits
Applied sciences
Circuit properties
Custom design
Electric, optical and optoelectronic circuits
Electronic circuits
Electronic equipment and fabrication. Passive components, printed wiring boards, connectics
Electronics
Exact sciences and technology
Films states of matter
Flow
General equipment and techniques
Humidity
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
Physics
Screen printing
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Sensors
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Studies
Temperature
Thermoelectric, pyroelectric devices, etc
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Summary:Purpose - The aim of this paper is to investigate the behavior of a new nanometric particle NTC thermistor paste and thick films obtained by screen printing.Design methodology approach - Nanometric powder of NTC thermistors based on complex spinel was made by calcination of an oxide mixture and ultra fast ball milling. Characterization of the new powder was done on compacts sintered in different conditions. Segmented thermistors were screen printed on alumina substrata, dried and fired in a conveyor furnace at 850°C 10 min. Segmented thermistors were indirectly heated by a glass sealed heater placed between them in the middle. The system was put in a tube with a regulated air flow to serve as a volume thermistor sensor based on heat loss.Findings - The sintered thick film samples and NTC powder compacts measurements could help in choosing the optimal technology conditions during the production of NTC devices. The NTC segmented thermistors were suitable both for heated sensors and self heated sensors.Practical implications - Low temperature thick film thermistor pastes based on nanometer powder of complex spinel are of interest due to their importance in sensor applications.Originality value - This work predicts that high temperature pastes of the same material can be realized with characteristics superior to those of low temperature paste such as NTC 3K3 or similar.
ISSN:1356-5362
1758-812X
DOI:10.1108/13565360610680712