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Photoconducting Bragg Mirrors based on TiO_2 Nanoparticle Multilayers

机译:基于TiO_2纳米粒子的光电布拉格反射镜。

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摘要

A synthetic route to building photoconducting films of TiO_2 nanoparticles that display bright structural color is presented. The color arises as a result of the periodic modulation of the refractive index, which is achieved by controlling the degree of porosity of each alternate layer through the particle size distribution of the precursor suspensions. The suspensions are cast in the shape of a film by spin-coating, which allows tailoring of the lattice parameter of the periodic multilayer, thus tuning the Bragg peak spectral position (i.e., its color) over the entire visible region. Photoelectrochemical measurements show that the Bragg mirrors are conductive and distort the photocurrent response as a result of the interplay between photon and electron transport.
机译:提出了一种构建具有明亮结构颜色的TiO_2纳米颗粒光电导膜的合成途径。颜色是折射率周期性调节的结果,这是通过通过前驱体悬浮液的粒径分布控制每个交替层的孔隙度来实现的。通过旋涂将悬浮液浇铸成薄膜形状,这允许定制周期性多层的晶格参数,从而在整个可见光区域上调节布拉格峰光谱位置(即其颜色)。光电化学测量表明,布拉格反射镜是导电的,并且由于光子与电子传输之间的相互作用而使光电流响应失真。

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