Tin oxide (SnO2) nanowires were synthesized on silicon substrate using chemical vapor deposition method.Scanning electron microscopy,X-ray diffraction and Raman spectrum analysis reveal that the as-synthesized SnO2 nanowires exhibit single crystalline in tetragonal rutile structure.Photoluminescence spectra of SnO2 nanowires show a strong emission peaked at 576nm.However,the 576nm emission gradually decreases with the increase of oxygen concentration during the thermal annealing,indicating the oxygen-related emission.Furthermore,the field emission properties of SnO2 nanowires get enhanced after annealing.The lowest turn-on and threshold field are 4.6 and 6.2V/μm,respectively.
