BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ZContent.net//ZapCalLib 1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH BEGIN:VEVENT SUMMARY:Utilizing Plasma Modification to Improve Tin(IV) Oxide Paper Gas Se nsors LOCATION:Chemistry A101 TZID:America/Denver DTSTART:20194001T000000 UID:2026-05-30-06-19-12@natsci.colostate.edu DTSTAMP:20260530T061912 Description:Research Seminar Abstract\n\nWith the move toward citizen scien ce to aid in monitoring air quality\, the need for portable\, robust\, and inexpensive gas sensors has driven work into fabricating novel devices. T in(IV) oxide (SnO2) nanomaterials are useful for solid-state gas sensors b ecause they can detect a wide range of gases and have a relatively low man ufacturing cost. Combining this material with a paper substrate has the ad ded benefit of increasing the flexibility of the device and increasing the amount of accessible SnO2 while maintaining overall sensor size. The requ ired operating temperature of SnO2 (≥300 °C)\, however\, limits the com bining of these materials and widespread commercialization of these device s. Plasma processing\, therefore\, is a promising strategy to address this issue and enhance gas sensor performance (i.e. selectivity and response a nd recovery time) by modifying the surface while maintaining desirable bul k properties.\n\nThis presentation will focus on the Ar/O2 plasma modifica tion of SnO2 nanoparticle paper gas sensors (PGS) as a function of various plasma operating parameters. Compared to the untreated nanoparticles on a traditional substrate (i.e.\, ZrO2)\, plasma treated PGS demonstrated an increase in response to carbon dioxide\, ethanol\, and benzene at ≤100  °C. Response and recovery studies also showed improved gas sensing behavio r to ethanol after plasma treatment at operating temperatures around room temperature. Along with gas sensing studies\, optical emission spectroscop y data from the gas-phase of the plasma will be presented as a means of wo rking toward ultimately elucidating the relationship between material surf ace chemistry and sensor performance. Finally\, some preliminary results o n the applicability of this fabrication method to other gas sensing materi als will be discussed. 4:00 pm END:VEVENT END:VCALENDAR