Development of SrPbO3 for the growth of nanostructures: a feasibility study

纳米结构的发展不仅在实验室中变得越来越重要，而且在商业产品中也越来越重要。现在，主要在健康和美容领域，各大超市都有大量含有纳米结构颗粒或依靠纳米结构实现功能的产品线。一种新的、令人兴奋的制造纳米结构的技术是基于铁电光刻技术，利用光激活态直接在铁电衬底的图案表面上制造纳米结构。这项技术是由克兰菲尔德大学（Cranfield University）与宾夕法尼亚大学（University of Pennsylvania）的邦内尔教授（D . Bonnell）等人合作开发的。本提案旨在通过增加氧化还原循环中可用于反应的光激发孔的数量来改善铁电材料的光化学性能。从文献和教科书中我们都知道，SrTiO3和BaTiO3等材料的光化学受到孔洞活动的限制。最近的一篇论文指出，材料SrPbO3具有增加系统中可用孔所需的一些特性。它具有约7eV的深价带和相对较小的1.8eV带隙，这些值意味着可以将SrPbO3的空穴注入由BaTiO3 （BT）或PbZrxTi1-xO3 （PZT）组成的标准光电池中。对文献和教科书的回顾表明，当这些特性结合到一个标准的PZT或BT光电池中时，电池的整体性能可以提高30%。将使用电池产生的光电流来测量电池的性能，并研究在照射过程中产生的纳米颗粒的大小和密度。

The development of nanostructures is becoming increasingly important not only in the laboratory but also as commercial products. Major supermarkets now carry a large number of product lines that contain nanostructured particles or rely on nanostructuring for functionality, mainly in the health and beauty sections. A new, and exciting, technique for making nanostructures is based on ferroelectric lithography where the structures are made directly onto the patterned surface of a ferroelectric substrate using a photo activated state. This is a technique that has been developed at Cranfield University in collaboration with others, such as Prof D Bonnell at University of Pennsylvania. This proposal seeks to improve the photochemical performance of the ferroelectric by increasing the number of photoexcited holes available for reaction in the REDOX cycle. It is well known from literature and text books that the photochemistry of materials such as SrTiO3 and BaTiO3 is limited by the activity of holes. A recent paper has indicated that the material SrPbO3 has some of the characteristics required to increase the holes available in the system. It has a deep valance band at ca 7eV and a relatively small band gap of 1.8eV, these values mean that it should be possible to inject holes from the SrPbO3 into the standard photocell that consists of BaTiO3 (BT) or PbZrxTi1-xO3 (PZT). A review of the literature and text books indicates that when these characteristics are combined into a standard PZT or BT photo-cell an enhancement of the overall cell performance by as much as 30% could be expected. Cell performance will be measured using the photocurrent produced by the cell and also investigation as to the size and density of nanoparticles produced during irradiation.