3 research outputs found
<span style="font-size: 22.5pt;mso-bidi-font-size:15.5pt;font-family:"Times New Roman","serif"; mso-bidi-font-weight:bold">Effect of preparation procedures on long-term performance of SnO<sub><span style="font-size:17.5pt;mso-bidi-font-size:10.5pt; font-family:"Times New Roman","serif";mso-bidi-font-weight:bold">2</span></sub><span style="font-size:17.5pt;mso-bidi-font-size:10.5pt;font-family:"Times New Roman","serif"; mso-bidi-font-weight:bold"> <span style="font-size:22.5pt;mso-bidi-font-size: 15.5pt;font-family:"Times New Roman","serif";mso-bidi-font-weight:bold">thin film sensing layers deposited with different methodologies </span></span></span>
749-766<span style="font-size:
15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">There is
an increasing demand for SnO<span style="font-size:12.5pt;
mso-bidi-font-size:5.5pt;font-family:" arial","sans-serif""="">2
semiconducting
gas sensors for several monitoring applications that have sensitivity, selectivity
and reliability on a long-term scale. The present paper reviews the long-term
performance of SnO2 thin film sensing layers, which strongly depend
on the preparation procedures and different thin film deposition techniques.
<span style="font-size:
15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">The
stability and reliability are very important for tin dioxide based gas sensor
devices, when these are to be integrated with standard CMOS circuitry. The stability
in the output of the thin film sensing layer is very essential to implement reliable
integrated sensor device, because a small drift in the baseline leads to a
large change in the biasing current in the subsequent
<span style="font-size:
15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">signal
processing circuit. The long-term stable behaviour of the SnO2
thin
film gas sensor has been found in the literature, and it depends on the thin film
deposition conditions, annealing temperature, time, ambient, and noble
metal/metal oxide dopant. It can be seen from the literature that, sensitivity
and stability of SnO<span style="font-size:13.0pt;mso-bidi-font-size:
6.0pt;font-family:" times="" new="" roman","serif""="">2
thin
film were strongly affected with variation in the crystallite (grain) size and
growth procedures. The thin films were deposited by chemical methods such as, screen-printing,
sol-gel, spray pyrolysis, etc. and physical methods such as, RGTO, sputtering,
PLA, etc. with the grain size varying from 5 to 50 nm with annealing
temperatures varying in the range 500-800<span style="font-size:20.0pt;
mso-bidi-font-size:13.0pt;font-family:" times="" new="" roman","serif""="">°C and
with noble metal/metal oxide dopants. Such type treated SnO2
thin
films have a little change in sensitivity but the sensing layer has much higher,
long time operational stability.
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