Luminescence Property And Synthesis Of Sulfur-doped ZnO Nanowires

Zinc oxide(ZnO)is an interesting wide band gap(3.3eV)semiconductor material with a binding energy of 60 meV.It makes more attention to the ultraviolet optoelectronic devices.In recent years,it has developed rapidly,main due to its promising applications in short-wave light-emitting devices,photodetectors,as well as antiradiation,high frequency and high-energy electronic devices.Up to now,ultraviolet lasing emission,the visible emission and properties of ultradetector of ZnO have became the main topics of much researchs.Zinc oxide(ZnO)nanowires have been successfully synthesized by an electric field-assisted electrochemical deposition in porous anodized aluminum oxide template at room temperature.The consistency of NaNO3aqueous solution was 0.0125M,and the consistency of Zn(NO3)₂ aqueous solution was 0.00166M.The structure,morphology, chemical composition and photoluminescence properties of the as-synthesized ZnO nanostructures were investigated.X-ray diffraction(XRD)and the selected area electron diffraction(SAED)results reveal that the as-synthesized products are single phase with hexagonal wurtzite structure with a highly preferential orientation in the(101)direction. Transmission electron microscopy(TEM)observations indicate that the nanowires are uniform with an diameter of 70-120 nm and length up to several tens of micrometers. Room-temperature photoluminescence(PL)is observed in the ZnO nanowires which exhibit strong NBE ultraviolet peaks and week green emissions.A violet emission at 464 nm and blue emissions at around 412-430 were also observed in the PL spectrum for the as-synthesized ZnO nanowires.The PL spectrum also exhibits a strong red peak at 617 nm.Sulfur-doped zinc oxide(ZnO:S)nanowires have been also synthesized by the same method.The consistency of Na₂S was 0.0125 M,and the consistency of Zn(NO₃)₂ was 0.00125 M.The structure,morphology,chemical composition and photoluminescence properties of the as-synthesized ZnO:S nanostructures were investigated.XPS further reveals the presence of S in the ZnO nanowires.Room-temperature PL is observed in the sulfur-doped ZnO nanowires which exhibits strong NBE ultraviolet peaks at 378 nm and 392 nm and week green emissions at 533 nm and 507 nm.A violet emission at 456 nm and blue emissions at around 406,420 and 434nm were also observed in the PL spectrum for the as-synthesized ZnO:S nanowires.The strong red peak at 617 nm disappeared in the PL spectrum.The result of the PL spectrum showed that S-doping had an obvious effect on the luminescence property of typical ZnO nanowires.In addition,the luminescence mechanism of ZnO nanowires at room temperature was discussed.The influence of S incorporation on luminescence property of ZnO nanowires was also discussed.The PL spectra of the nanowires at room temperature reveals that the PL spectrum of S-doped ZnO nanowires experiences blueshift compared to that of the pure ZnO nanowires and the intensity changes of PL spectrum can be discovered.