ZnO纳米薄膜在竹材表面的生长及防护性能

Growth of ZnO nano films on bamboo surface and its protective performance

在低温溶液反应体系下,通过晶种形成和晶体生长两步法在竹材表面培育ZnO纳米结构薄膜,应用场发射环境扫描电镜(FESEM)、X射线衍射仪(XRD)和X射线能谱仪(EDAX)对薄膜形态和结构进行表征,重点研究种子液浸渍时间对纳米薄膜形态及竹材防霉和抗光变色性能的影响.研究结果表明,在生长时间一定的前提下,竹材在种子液中经过0.5h、1h和2h的浸渍,其表面可形成壁厚为50～80nm的网状结构薄膜,使竹材的防霉性能和光稳定性得到显著改良;当种子液浸渍时间增加到4h,网状结构薄膜则被大量直径约700nm的ZnO圆片所覆盖,虽然此时竹材的防光变色性能保持不变,但防霉性能下降,表明纳米网状结构对于充分发挥ZnO防护性能起到重要作用.

ZnO films with nano structure were grown on the surface of bamboo via a low temperature aqueous solution route with a two step procedure of crystal seed formation and growth. The films were characterized by field emission scanning electron microscope （FESEM） , X-ray diffraction （XRD） and energy dispersive X-ray analysis （EDAX）. The effect of immersion time in seed solution on film morphologies, mildew resistance and anti-photodis-coloration properties of bamboo was mainly investigated. The results showed that bamboo immersed in ZnO seed solution for 0. 5 h, 1 h and 2 h was mainly covered with nano netlike films with wall thickness ranging from 50 nm to 80 nm, which significantly improved both the anti-photodiscoloration and mildew resistance of bamboo. However, the surface of bamboo was covered with ZnO disks with a diameter of approximate 700 nm if the immersion time was increased to 4h, which exhibits lower mildew resistance than the nano netlike films, but the anti-photodiscoloration performance is almost the same. The above results confirm the significance of nano structure for the protective performance of ZnO films for bamboo. This method can also be extended to various natural biomaterials including wood.