Size-controllable one-dimensional SnO2 nanocrystals: synthesis, growth mechanism, and gas sensing property.
Single crystalline one-dimensional (1-D) SnO(2) nanocrystals with controllable sizes, including the diameter and the aspect ratio, were synthesized by modulating the precursor concentration, reaction time and temperature via a solution method. By regulating the growth in a kinetic regime, a higher temperature range (220-240 degrees C) was beneficial to the growth of SnO(2) nanowires, while reactions below 220 degrees C only resulted in nanorods or even nanoparticles. The aggregates of SnO(2) nanocrystals in the forms of hollow spheres and dendrites were observed as the intermediates for the nanowires. Based on the TEM and SEM observations, the growth mechanism is discussed from the viewpoints of the nature of the reverse micelles and the crystal habit of rutile SnO(2). CO gas sensing measurements were also carried out for SnO(2) nanocrystals with different assembly styles. The results indicate that the sensitivity had close correlation to the specific surface area of the nanocrystals.
Zhang
Dong-Feng
DF
Beijing National Laboratory for Molecular Sciences, State Key Lab of Rare Earth Materials Chemistry and Applications, PKU-HKU Joint Lab in Rare Earth Materials and Bioinorganic Chemistry, Peking University, Beijing 100871, China.
Sun
Ling-Dong
LD
Xu
Gang
G
Yan
Chun-Hua
CH
D002248:Carbon Monoxide / Q000737:chemistry; D005740:Gases / Q000737:chemistry*; D017348:Microscopy, Electron, Scanning Transmission; D053758:Nanoparticles / Q000737:chemistry*; D010316:Particle Size; D017971:Tin Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
D005740:Gases; D017971:Tin Compounds; D002248:Carbon Monoxide; C045358:stannic oxide