Nanosized SnO 2 powders were synthesized by using the direct pyrolysis means from SnC 2O 4 .The specimens were characterized by TEM, XRD, TG-DTA, FTIR and BET. TEM and XRD showed that the SnO 2 crystallines were less ...Nanosized SnO 2 powders were synthesized by using the direct pyrolysis means from SnC 2O 4 .The specimens were characterized by TEM, XRD, TG-DTA, FTIR and BET. TEM and XRD showed that the SnO 2 crystallines were less than 8 nm in diameter together with a narrow particle size distribution. BET showed that the surface area of SnO 2 was 115.2 m 2/g. FTIR spectra revealed that the absorptions of Sn—O and —OH bonds in SnO 2 ultrafine powders were red-shifted and broadened. According to the curve of TG-DTA, SnC 2O 4 transformed into SnO 2 completely after being calcined at 250 ℃. Further gas sensing experiments testified that the response and recovery times to C 2H 5OH were shorter than those obtained by the conventional precipitation method.展开更多
文摘Nanosized SnO 2 powders were synthesized by using the direct pyrolysis means from SnC 2O 4 .The specimens were characterized by TEM, XRD, TG-DTA, FTIR and BET. TEM and XRD showed that the SnO 2 crystallines were less than 8 nm in diameter together with a narrow particle size distribution. BET showed that the surface area of SnO 2 was 115.2 m 2/g. FTIR spectra revealed that the absorptions of Sn—O and —OH bonds in SnO 2 ultrafine powders were red-shifted and broadened. According to the curve of TG-DTA, SnC 2O 4 transformed into SnO 2 completely after being calcined at 250 ℃. Further gas sensing experiments testified that the response and recovery times to C 2H 5OH were shorter than those obtained by the conventional precipitation method.
