Growth kinetics of nanograins in SnO2 fibers and size dependent sensing properties

Formation mechanism of porous hollow SnO2 nanofibers prepared by one-step electrospinning

“…The average grain size after 3 hrs calcination is obtained by calculating the size of three intense peaks, (110), (101) and (211) of SnO 2 from XRD patterns. When D 0 is neglected, the estimated m value is 13.2, which is inconsistent with the classical grain growth value (m = 2~4) [20], which means the grain growth of the nanograins observed in the individual nanofibers cannot be primarily ascribed by lattice diffusion in a pore controlled scheme. When the new bridges are established to transport the mass materials as mentioned above, the connection for lattice diffusion are broken and surface diffusion will enhance the local voids, meanwhile acts as the driving force for grain growth, leading to acceleration in the speed of coarse grains by the reduction of the free energy of the system.…”

Electrical transport properties of ZnO nanofibers

“…The size of nanograins can be controlled by changing the calcination temperature or time. The growth behaviors of grains in oxide nanofibers including ZnO [9], SnO 2 [21], TiO 2 [22], NiO [23], and CuO [24] have been systematically investigated by one of current authors. The nanograins in individual nanofibers are not in a thermodynamic equilibrium state.…”

Highly sensitive and selective H2 sensing by ZnO nanofibers and the underlying sensing mechanism

“…It is reasonable to conclude that, from a microstructural point of view, the two nanofibers are similar. The presence and evolution of nanograins were reported in various oxide nanofibers including ZnO [18,23], TiO 2 [24], SnO 2 [25], NiO [26], and CuO [27]. The crystal structures of the ZnO and SnO 2 nanofibers produced were investigated using XRD analysis and the results of those analyses are shown in Fig.…”