Speaker
Description
Saowalak Homnan$^1$$^,$$^a$, Anurat Wisitsoraat$^2$$^,$$^3$$^,$$^b$, Adisorn Tuantranont$^2$$^,$$^4$$^,$$^c$, Sukon Phanichphant$^2$$^,$$^d$, Chaikarn Liewhiran$^1$$^,$$^2$$^,$$^5$$^*$
$^1$Department of Physics and Materials Science, Faculty of Science, Chiang Mai University,Chiang Mai 50200, Thailand
$^2$Center of Advanced Materials for Printed Electronics and Sensors, Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand
$^3$Carbon-based Devices and Nanoelectronics Laboratory, National Electronics and Computer Technology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani 12120, Thailand
$^4$Thailand Organic and Printed Electronics Innovation Center, National Electronics and Computer Technology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani 12120, Thailand
$^5$Center of Excellence in Materials Science and Technology, Chiang Mai University, Chiang Mai 50200, Thailand
$^a$ppsaowalak.h@gmail.com,$^b$anuratwisit@hotmail.com,$^c$adisorn.tuantranont@gmail.com,$^d$sphanichphant@gmail.com
$^*$ Corresponding author’s e-mail address: cliewhiran@gmail.com (C. Liewhiran)
Abstract. In the present study, gas-sensing properties of flame-spray-made 0-2 wt% Y$_2$O$_3$-doped SnO$_2$ nanoparticles are systematically and selectively studied for detection of acetone (C$_3$H$_6$O) which practically occurred in specific applications. Structural characterizations by electron microscopy, X-ray analysis and nitrogen adsorption further confirmed the formation of loosely agglomerated SnO$_2$ nanoparticles (5-15 nm) with high specific surface area and highly crystalline tetragonal-cassiterite SnO$_2$ structure doped with Y$^3$$^+$oxidation states. The gas-sensing properties of undoped SnO$_2$ and Y$_2$O$_3$-doped SnO$_2$ sensors were systematically tested towards C$_3$H$_6$O under atmospheric conditions at the working temperature ranging from 200-350°C. Tested results indicated that the optimal 0.2 wt% Y$_2$O$_3$-doped SnO$_2$ exhibited high responses of ∼322 to 400 ppm acetone under exposure at working temperature of 350°C in dry air compared with undoped one. Moreover, the optimal Y$_2$O$_3$-doped SnO$_2$ sensors evidently displayed high selectivity against various gas/vapor categories including flammable gases, toxic gas and VOCs. Therefore, Y$_2$O$_3$-doped SnO$_2$ sensors are potential for responsive detections of C$_3$H$_6$O at ppm-level but with limited selectivity and may be useful for environmental and biomedical applications.
Keywords : n-type Y/SnO$_2$, Nanoparticles, Acetone, Acetylene, Sensor.
