Ni体积分数对Ni-Al_2O_3太阳光谱选择性吸收薄膜光学性能的影响  

Effect of volume fraction of nickel on optical properties of Ni-Al_2O_3 solar selective absorbing films

作　　者：李镇祥[1] 范泽婷[1] 陆子华[1] 赵剑曦[1] 

机构地区：[1]福州大学化学化工学院,福建福州350108

出　　处：《功能材料》2012年第20期2818-2822,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(20873024);福建省青年人才创新基金资助项目(2008F3058)

摘　　要：借助计算机模拟剖析了Ni体积分数对Ni-Al2O3太阳光谱选择性吸收薄膜光学性能的影响规律,并依据这一规律指导了以水溶胶-凝胶法制备的Ni-Al2O3太阳光谱选择性吸收膜系的优化。模拟结果表明,以呈现类金属特征的基层Ni-Al2O3薄膜与Ni体积分数不超过基层0.5倍且呈非金属特征的中间层薄膜组合,在其上再沉积一减反射顶层,如此3层复合可获得高吸收率和低发射率的太阳光谱选择性吸收膜系。依据这一规律指导的以水溶胶-凝胶法制备的Ni-Al2O3膜系其吸收率高达0.93,发射率低至0.04,成为一个很好的太阳光选择性吸收表面。The effect of the volume fraction of nickel on the optical properties of Ni-Alz 03 solar selective absorb- ing films was investigated by computer simulation. The knowledge obtained was used to guide the optimization of Ni-A12O3 coatings fabricated by aqueous sol-gel method. The results of theoretical simulation showed that the double absorbing coatings, of which consists of a base layer with metal-like character and a middle layer with volume fraction less than 0.5 times of the base layer, together with an anti-reflection top layer could pro- duce excellent optical absorption. Based on the principles, the optimized Ni-Al2O3 coatings were fabricated by aqueous sol-gel method, which attained a high solar absorptance of 0.94 and a low thermal emittance of 0.04.

关 键 词：Ni体积分数 Ni-A12O3薄膜 光学性能 作用规律 溶胶-凝胶 

分 类 号：TB33[一般工业技术—材料科学与工程] O648[理学—物理化学]