国产成人亚洲精品无码青app,白丝紧致爆乳自慰喷水,国产疯狂女同互磨高潮在线观看,jizzjizz少妇亚洲水多

The structural and optical properties of pure and Na-doped ZnO thin films have been investigated by X-ray?diffraction (XRD), atom force microscopy and UV–Vis spectrophotometer. The crystal structure of all the thin?films is the hexagonal wurtzite. The average grain size and surface roughness increases with the increase of?the Na/Zn ratio. The optical band gap of the thin films decreases from 3.26 to 3.12 eV by increasing the Na/Zn?ratio from 0.0 to 0.10. Transmittance spectra were used to determine the optical constants of the thin films,?and the effect of Na/Zn ratio on the optical constants was investigated. With the increase of Na/Zn ratio, the?refractive index decreases and the extinction coefficient increases in the 380–700 nm spectral range.