Fabrication of tin dioxide/polyaniline (SnO 2 /PANI) composite nanofibers by electrospinning technique for hydrogen gas sensing at low temperature is reported. Usually, nanofibers of pure or doped metal-oxide as gas sensor require high operating temperature more than 200 o C. Fourier transform infrared (FTIR) and ultraviolet visible (UV-VIS) spectral analysis of as-prepared SnO 2 /PANI composite nanofibers revealed the incorporation of SnO 2 in PANI matrix. Scanning electron micrographs (SEM) showed the increased in diameter of SnO 2 /PANI composite nanofibers as compared to that of pristine SnO 2 nanofibers of average diameter of 200 nm, indicated the encapsulation of PANI on the surface of SnO 2 nanocrystallites. The presence of tetragonal and crystalline structure of SnO 2 in as-prepared SnO 2 /PANI composite nanofibers was not affected with the incorporation of PANI as confirmed from X-ray diffraction (XRD) pattern. Compared with the pristine SnO 2 nanofibers, the SnO 2 /PANI composite nanofibers showed improved hydrogen gas sensing nearly at room temperature. The proposed sensing mechanism was systematically co-related to the existence of p-n heterojunction in SnO 2 /PANI hybrid material.

No abstract

No abstract

No abstract

No abstract