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Photo-reduction of silver salts on highly heterogeneous lead zirconate titanate

机译：高度异质锆钛酸铅上的银盐的光还原

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This paper presents the work undertaken to determine the influences on the photo-induced growth of silver nanoclusters on the surfaces of lead zirconate titanate thin films. The lead zirconate titanate films were grown on indium tin oxide coated glass. They exhibited a highly textured surface and can be treated as wide bandgap semiconductors that exhibit ferroelectric behaviour. We show that there is a preferential deposition of silver metal on the ferroelectric films that is related not only to the polarization state of the ferroelectric domains but also to the surface defects such as grain boundaries and defects within the film. The greatest deposition rates are found to occur at grain boundaries where there is an approximately 40:1 ratio of silver clusters when compared to the native positive domains exhibited by the lead zirconate titanate. We propose that the mechanism for cluster growth depends on the availability, and diffusion rate, of electrons into the growing cluster and that the clusters grow from a discrete nucleation point. We also show that the growth of a monolayer of silver is sufficient to prevent the formation of electron-hole pairs by blocking the UV irradiation and that the silver nanoparticles are readily removed from the surface using an ultrasonic bath leading to a possible new method of manufacturing metal nanoparticles.
机译：本文介绍了为确定锆钛酸铅钛薄膜表面上银纳米团簇对光诱导生长的影响而进行的工作。锆钛酸铅薄膜在氧化铟锡涂层的玻璃上生长。它们表现出高度织构化的表面，可以被视为具有铁电行为的宽带隙半导体。我们表明，在铁电薄膜上存在优先沉积的银金属，这不仅与铁电畴的极化状态有关，而且还与诸如晶界和薄膜内缺陷之类的表面缺陷有关。当与钛酸锆钛酸铅表现出的天然正畴相比时，发现最大的沉积速率发生在晶界处，其中银簇的比例约为40：1。我们提出，簇生长的机理取决于电子进入生长簇的可用性和扩散速率，并且簇从离散的成核点生长。我们还表明，单层银的生长足以阻止紫外线辐射，从而防止形成电子-空穴对，并且使用超声浴可以很容易地从表面去除银纳米颗粒，从而可能提供一种新的制造方法金属纳米粒子。

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