Structural, electrical and optical studies on AgI–anatase composites
Structural, electrical and optical studies on AgI–anatase composites
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DOI：
10.1088/0953-8984/15/29/317
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发表时间：
2003-07
期刊：
影响因子：
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通讯作者：
S. Mochizuki;F. Fujishiro
中科院分区：
文献类型：
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作者：
S. Mochizuki;F. Fujishiro
首次制备了AgI -锐钛矿复合材料(x)AgI -(1−x)锐钛矿，其组成范围为0-100% AgI。在300 K时，电导率随AgI含量的增加而增加，在40% AgI左右达到最大值（约3 × 10−2 S m−1）。与原始AgI相比，电导率提高了约三个数量级。用扫描电子显微镜和x射线衍射对这些复合样品进行了表征。扫描电镜观察表明，锐钛矿细颗粒密集地包裹在几微米大小的AgI颗粒中，这些复合颗粒在三维空间上相互连接，形成复合试样。在8 ~ 278 K的不同温度下测量了复合材料的光致发光光谱、激发光谱和时间分辨光谱。结合形态、结构和电导率数据，讨论了与锐钛矿颗粒和锐钛矿填充AgI颗粒中AgI结构域相关的激子谱。
AgI–anatase composites, (x)AgI–(1 − x)anatase, were fabricated over a wide composition range of 0–100% AgI for the first time. The electrical conductivity at 300 K increases with increasing AgI content and reaches a maximum (about 3 × 10−2 S m−1) at about 40% AgI. The conductivity is enhanced by about three orders of magnitude in comparison with that of pristine AgI. These composite specimens have been characterized by both scanning electron microscopy and x-ray diffractometry. The observations with a scanning electron microscope show that anatase fine particles are densely packed in an AgI particle of several micrometres in size and such composite particles are three-dimensionally connected to each other to form a composite specimen. The photoluminescence (PL), PL excitation and time-resolved PL spectra of these composites have also been measured at different temperatures between 8 and 278 K. The exciton spectra obtained related to the anatase particles and the AgI domains in anatase-packed AgI particles are discussed in the light of the morphological, structural and conductivity data.