竹材表面ZnO 纳米薄膜的自组装及其抗光变色性能.doc

竹材表面ZnO纳米薄膜的自组装及其抗光变色性能 宋烨1,2 余雁1( 王戈1 田根林1 程海涛1 吴义强2 （1） ZnO纳米棒对紫外线具有超强的吸收能力，有可能大幅度改善竹材抗光变色性能。本文采用低温水溶液法，通过ZnO晶种形成和晶体生长两道工序在竹材表面自组装形成ZnO纳米薄膜。探讨在晶体生长条件一致的前提下形成ZnO纳米棒所需的种子液浸渍时间，重点研究ZnO纳米棒改性竹材的抗光变色性能。结果表明：①经过0.5 h和1 h浸渍在竹材表面形成了由直径小于20 nm的ZnO纳米颗粒组成的薄层；②经过2 h浸渍则使竹材表面又出现了微纳米网状和哑铃棒状结构；③经过4 h浸渍，表面薄膜形态则以无序的纳米棒和微纳米六面体结构为主；④ZnO纳米棒改性竹材试样人工加速光老化120h后表观颜色的总色差△E是空白试样的三分之一。研究结果指出，可以采用低温水溶液法在竹材表面自组装形成ZnO纳米棒，显著提高竹材表观颜色的光稳定性。 关键词：竹材；ZnO；纳米薄膜；抗光变色 SONG Ye1,2；YU Yan1(；WANG Ge1；TIAN Gen-lin1；CHENG Hai-tao1；WU Yi-qiang2. ZnO nano film self-assemble and anti-light discoloration properties on bamboo. Journal of Beijing Forestry University [Ch，16 ref.] 1 International Center for Bamboo and Rattan, Beijing, 100102, P.R. China; 2 College of Materail Science and Engineering, Central South Forestry Science and Technology University, Changsha, 410004, P.R. China. ZnO nano rod owns the potential to improve the anti-light discoloration properties of bamboo because of its strong absorption for ultraviolet. This paper explored the possibility of forming nano scale ZnO film via a low temperature aqueous solution route on the surface of bamboo to improve its anti-light discoloration properties. The route is a two-step process consisting of ZnO crystal seed formation and seed growth. The effect of immersion time in the seed solution on the morphologies of films was mainly investigated. The results showed that the film morphologies are closely correlated to the immersion time in ZnO seed solution for the same seed growth conditions. Films formed on bamboo immersed in the ZnO seed solution for 0.5 h and 1h mainly consisted of ZnO nano particles with a diameter of less than 20 nm, and of reticulations and dumbbells for 2 h. A film that consists of mainly randomly arranged nano rods and some micro-nano hexahedrons was formed if the immersion time was increased to 4 h. It’s further found that the total color difference (△E) of the control sample was three times of the one grown with ZnO na