CO2 Gas Sensing Response of YPO4 Nanobelts Produced By a Colloidal Method 

Tuesday, October 13, 2015: 11:40
106-C (Phoenix Convention Center)
C. R. Michel, A. H. Martinez (Universidad de Guadalajara CUCEI Departamento de Fisica), and C. D. Rivera-Tello (Universidad de Guadalajara CUCEI Departamento de Fisica)
YPO4 has been extensively studied as host lattice for luminescence materials; however, little is known about its gas sensor properties. In this work, YPO4 was synthesized by a colloidal method using yttrium nitrate, phosphorous acid and CTAB (as surfactant). The calcination at 500ºC produced single–phase YPO4 nanobelts, having length between 3 and 10 mm, and width between 70 and 250 nm. Impedance measurements were performed on thick films made with the as–prepared YPO4 nanobelts. The results show repeatability for detecting 200 ppm CO2, from 350ºC; however, the response was enhanced at 400ºC. At this temperature YPO4 responded in a wider frequency range, from 100 Hz to 100 kHz. Quantitative detection of CO2, in the range 200 – 800 ppm, was evaluated through a variation of the dielectric constant of the film. Preliminary results of CO sensing displayed a fast response, but also large data scattering and a long term drift were present. According to its response to CO, a p–type semiconductor behavior was noticed.