AVS 62nd International Symposium & Exhibition | |
Electronic Materials and Processing | Friday Sessions |
Session EM+AS+EN+NS-FrM |
Session: | Nanoparticles for Electronics and Photonics |
Presenter: | Karthik Tangirala, CINVESTAV-IPN, Mexico |
Authors: | V.K. Tangirala, CINVESTAV-IPN, Mexico M.A. Olvera, CINVESTAV-IPN, Mexico |
Correspondent: | Click to Email |
In this work, we report the synthesis, characterization and manufacturing of Cu, Pt and Pd doped SnO2 pellets with ultra high sensitivities for CO atmospheres. To the best of our knowledge, we have accounted for the first time the ultra high CO sensitivities for Cu doped than Pt and Pd doped SnO2 pellets. In order to obtain high sensitivities, we have employed novel methods, which are the mixture of chemical and physical synthesis methods. Non-spherical SnO2 structures were prepared via two chemical synthesis routes using Urea (R1) and ammonia (R2) as precipitation agents. The resultant SnO2 powders were doped with transition metal, Cu, and noble metals like Pt and Pd via two doping methods D1 and D2. In D1, the powders were bulk doped and then ball milled, whereas in D2, the powders were ball milled and then surface doped. All the powders obtained were later pressed using manual pressing machine to manufacture the SnO2 pellets. The effect of synthesis routes, doping methods and dopants, on the structural, morphological and also on CO sensing were studied by different characterization techniques and reported with their detailed explanations. Interestingly, the Cu-SnO2 pellets manufactured from the powders obtained by method D1R1, showed highest sensitivity around 1783 due to various reasons like uniform and small particle size, necks formation, inter-particle conductance and high oxygen adsorption due to stacking faults. All the reasons mentioned above were demonstrated by comparing the established sensor theory with our different experimental results obtained using XRD, Raman, SEM, HRTEM and sensitivity analysis.