Synthesis of nano-AgI arrays and their optical properties
Synthesis of nano-AgI arrays and their optical properties
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DOI：
10.1557/jmr.2001.0139
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发表时间：
2001-04
影响因子：
2.7
通讯作者：
Yinhai Wang;J. Mo;W. Cai;L. Yao;Lide Zhang
中科院分区：
文献类型：
--
作者：
Yinhai Wang;J. Mo;W. Cai;L. Yao;Lide Zhang
采用电化学双液沉积法在有序多孔氧化铝膜上制备了纳米碘化银阵列。X射线衍射分析表明，纳米AgI/Al_2O_3组装体是立方锌钛矿型γ-AgI和六方纤锌矿型β-AgI的混合物。可见-紫外光吸收测量表明，该组装体的吸收边仅为2.82 eV，具有直接带隙半导体的光学特性。与纯的γ-AgI相比，组装体的吸收边向较短的波长移动，而与纯的β-AgI相比，组装体的吸收边向较长的波长移动。我们认为组装体吸收边的变化是由于γ-AgI和β-AgI的混合。
Nano-AgI arrays were synthesized by electrochemical double liquor deposition in ordered porous alumina membrane. On the basis of the analysis of x-ray diffraction patterns, the assembly of nano-AgI/Al_2O_3 is a mixture of a cubic zinc blende type γ–AgI and a hexagonal wurtzite type β–AgI. The visible–ultraviolet optical absorption measuring showed that the assembly only had an absorption edge at 2.82 eV and exhibited the optical features of a semiconductor with a direct band gap. The absorption edge of the assembly was shifted to a shorter wavelength compared with pure γ–AgI and a longer wavelength compared with pure β–AgI. We believed that the change of the absorption edge of the assembly is due to the mixture of γ–AgI and β–AgI.