부산대학교 도서관

Mesoporous SnO.sub.2, Sn.sub.0.861Al.sub.0.186O.sub.2, Sn.sub.0.921In.sub.0.106O.sub.2 and Sn.sub.0.959La.sub.0.055O.sub.2 nanospheres were successfully synthesized by a one-step solvothermal method. The compositions, crystal structures, microstructures, morphology and gas-sensing performance of the as-synthesized Al-, In- and La-doped SnO.sub.2 nanospheres were characterized by XRD, EDS, TEM, SEM, FT-IR, UV-vis and BET. All samples present the similar mesoporous-structural nanospheres due to the same chemical synthesis conditions. The gas-sensing results indicate that the cations-doping greatly affects the formaldehyde gas-sensing performance, and the response increases with the increasing radius of Al, In and La. Owing to the higher specific surface area and larger La.sup.3+ radius, Sn.sub.0.959La.sub.0.055O.sub.2 sensor presents the best gas-sensing performance with the response value of 149.59 to formaldehyde gas at 200 °C. It is concluded that metal-cation doping not only causes lattice distortion to increase oxygen vacancies, but also could refine the crystalline grain to improve the specific surface area of metal-cations doped SnO.sub.2 nanospheres.
Author(s): F. Y. Zhou [sup.1], B. Hong [sup.1], J. C. Xu [sup.1], Y. B. Han [sup.1], H. X. Jin [sup.1], D. F. Jin [sup.1], Y. X. Zeng [sup.1], X. L. [...]