Design and fabrication of BaTiO3 humidity sensor using thick film screen printing technique
Thick film sensor technology has been recognized as an important technology in sensor manufacturing for the last decade. The technology contributes to the sensor development with the exploitation of the film itself as a primary sensing device. Most ceramic materials have been investigated as a humid...
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| வடிவமà¯: | Thesis |
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2006
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| நிகழà¯à®¨à®¿à®²à¯ˆ அணà¯à®•à®²à¯: | http://eprints.uthm.edu.my/816/ http://eprints.uthm.edu.my/816/1/24_Pages_from_DESIGN_AND_FABRICATION_OF_Ba_TiO3_HUMIDITY_SENSOR_USING_THICK_FILM_SCREEN_PRINTING_T.pdf |
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| தொகà¯à®ªà¯à®ªà¯: | Thick film sensor technology has been recognized as an important technology in sensor
manufacturing for the last decade. The technology contributes to the sensor development
with the exploitation of the film itself as a primary sensing device. Most ceramic
materials have been investigated as a humidity sensor mainly on porous structure
prepared by thick film technology. These films have microstructure properties similar to
those of sintered porous bodies, but the dimensions of the sensing devices can be
reduced, which then can be used in hybrid circuits.
In this work, two types of analyses will be made based on Barium Titanate (BaTiOa)
dielectric material. The First one is to analysis the electrical properties of BaTi03
material in bulk and thick film forms and second analysis is to characterize thick film
BaTi03 for a humidity sensor at room temperature. The BaTi03 powder was prepared
through solid state reaction using a raw material Barium Carbonate (BaC03) and
Titanium Dioxide (Ti02). The thick film paste was prepared by mixing an organic
vehicle with the sintered powder in appropriate ratio. The paste was then screen printed onto a ceramic substrate in an interdigitated electrode pattem using DEK J1202 screen
printing machine. The dielectric property of BaTi03 was investigated by varying the
frequency in the range of 10Hz to 10 MHz using the Impedance Analyzer. The
characterization of the thick film sensor with response to the Relative Humidity (%RH)
was carried out in the Humidity Climatic Chamber in the range of 20%RH to 95°%RH.
LCR meter and PIC conditioning unit was used to measure the response of the BaTi03
thick film sample with the changes of the Relative Humidity..
The results showed that the dielectric response of the BaTi03 material in bulk and film
samples are the same, based on the quasi dc concept. A smaller gap of interdigitated
electrode pattem gave a higher response in dielectric properties compared to the bigger
gap. The BaTi03 thick film sensor showed decrement in resistance and increment in
capacitance with respect to the increases of Relative Humidity (RH). The voltagehumidity
characteristic of the sensor showed a good linearity and the sensor response
time is faster than the recovery time. The PIC conditioning circuit is designed to convert
the analogue voltage into digital value and display the measurement result through
Liquid Crystal Display (LCD) to make the system more user-friendly. As a conclusion,
BaTi03 thick film shows a good promising material to be used as a humidity sensor
based on thick film screen printing technology.
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