Competitive influence of grain size and crystallinity on gas sensing performances of ZnO nanofibers

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.…”

Importance of the nanograin size on the H2S-sensing properties of ZnO–CuO composite nanofibers

“…All the nanofibers were distributed randomly and uniformly over the substrates, showing no significant difference in connectivity or the overall distribution of nanofibers with regard to the heat treatment duration. The evolution of nanograins in oxide nanofibers were investigated thoroughly by some authors [20][21][22][23]. According to the investigations, the activation energies of the nanograins were one order of magnitude smaller than their bulk counterparts [20][21][22].…”

“…According to earlier reports on the growth of nanograins in oxide nanofibers [20][21][22][23], the use of various calcination conditions regarding the duration and temperature might change the size of nanograins. The effect of the grain size on the H 2 S-sensing properties of composite nanofibers needs to be confirmed by some systematic investigations.…”

“…Instead of CuO-SnO 2 composite nanofibers, CuO-ZnO composites are more suitable for this purpose because the growth of nanograins in SnO 2 nanofibers is quite limited [22]. On the other hand, in ZnO nanofibers nanograins grow significantly [20,23] under the similar calcination conditions. Therefore, more diverse nanograin sizes can be obtained in CuO-ZnO composite nanofibers by applying reasonable calcination conditions.…”

Organometallic synthesis of ZnO nanoparticles for gas sensing: towards selectivity through nanoparticles morphology

“…It can be supposed that the poor crystallinity of CL sensors type (Fig. 3) conducts at very unfavorable adsorption conditions for propane (Katoch et al 2013).…”