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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。
The sol-gel method was combined with vacuum annealing to prepare TiOx-C nanocomposite films. In sol, soluble organic salicylic acid with one benzene ring was chosen as carbon precursor and acetylacetone as complexing agent. The structure, composition and spectral properties of the composites were investigated in detail by scanning electron microscopy, high resolution transmission electron microscopy, four-probe, ellipsometer and spectrophotometer. The results show that the nanocomposite is composed of nanocrystalline graphite embedded in amorphous matrix material. The structure exhibits excellent spectral selectivity (α = 0.957, ε = 0.179). Meanwhile, due to the excellent thermal stability of C and TiOx, the nanocomposite films showed good environmental resistance after passing through the aging test at 500oC / 30h. Through this series of characterization results, indicating that the nanocomposites is a promising new choice of absorbing film.