TiO_x-C纳米复合薄膜的溶胶-凝胶法制备及其太阳能选择吸收性能（英文）

Preparation of TiO_x-C Nano-Composite Films as Solar Selective Absorbers by Sol-Gel Method

将溶胶-凝胶方法与真空退火处理相结合,制备了TiOx-C纳米复合薄膜。在溶胶中,选用具有1个苯环的可溶性有机物水杨酸作为碳的前驱体;乙酰丙酮作为络合剂。利用扫描电子显微镜,高分辨透射电子显微镜,四探针,椭圆偏振光谱仪和分光光度计等表征手段,详细研究了复合材料的结构,成分及其光谱特性。结果显示,这种纳米复合材料的组成形式为非晶基体材料中镶嵌纳米石墨晶,这种结构呈现出优异的光谱选择性(α=0.957,ε=0.179)。同时,由于C和TiOx出色的热稳定性,在通过500oC/30h的老化性测试后,该纳米复合薄膜表现出良好的环境耐受性。通过这一系列表征结果,说明该纳米复合材料是一种极具潜力的新型选择吸收薄膜。

TiO_x-C nano-composite films were prepared by a sol-gel process, followed by carbonization in vacuum. A soluble organic compound, salicylic acid, coupled with a quasi-crystallized benzene ring structure was served as carbon sources; acetylacetone was used as complexing agent. Using scanning electron microscope, high-resolution transmission electron microscope, four-point probe, spectroscopic ellipsometer and spectrophotometer, the structure, composition and the performance of the films were investigated. The results reveal that the nano-composite film is made up by nano-graphites embedded in amorphous matrix, presenting outstanding optical selectivity(α=0.957 and ε=0.179). Owing to the excellent chemical and thermal stability of both carbon and Ti Ox, the composite film also presents prominent durability after subject to a 500 oC, 30 h aging test. In terms of these results, the composite film is found to be a potential candidate for selective solar absorbers.