[摘要]：A new kind of SnO(2) nanotubes loaded with Ag(2)O nanoparticles can be synthesized by using Ag@C coaxial nanocables as sacrificial templates. The composition of silver in SnO(2) nanotubes can be controlled by tuning the compositions of metallic Ag in Ag@C sacrificial templates, and the morphology of tubular structures can be changed by use of nanocables with different thicknesses of carbonaceous layer. This simple strategy is expected to be extended for the fabrication of similar metal-oxide doped nanotubes using different nanocable templates. In contrast to SnO(2)@Ag@C nanocables as well as to other types of SnO(2) reported previously, the Ag(2)O-doped SnO(2) nanotubes exhibit excellent gas sensing behaviors. The dynamic transients of the sensors demonstrated both their ultra-fast response (1-2 s) and ultra-fast recovery (2-4 s) towards ethanol, and response (1-4 s) and recovery (4-5 s) towards butanone. The combination of SnO(2) tubular structure and catalytic activity of Ag(2)O dopants gives a very attractive sensing behavior for applications as real-time monitoring gas sensors with ultra-fast responding and recovering speed.
