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• W2952802437 abstract "Ordered nanostructure arrays are attracting intensive scientific attention because of their many and varied applications. However, it is still a challenge to achieve ordered nanostructure patterning over a relatively large area (for instance on the wafer scale) by a technique that will allow high throughput, large pattern area and low equipment costs. Part of the work reported here is the achievement of facile transferring of ultrathin alumina membranes (UTAMs) which have been attached on wafer-scale substrates without any twisting, folding, cracking or contamination because of the unique design of the fabrication and transferring processes. The crucial element of this method is fixing the prepared 4-inch UTAM onto a wafer-scale substrate before removing the remaining Al and the alumina barrier layer. The thickness and surface smoothing of the UTAMs play a vital role in this process. By using these perfectly transferred UTAMs as masks, various nanostructuring patterns including nanoparticles, nanomeshes, and nanowire arrays have been fabricated on wafer-scale substrates with tunable and uniform dimensions. The method is a template method, which is not reliant on a specific requirement for the UTAMs, the substrates and the deposited materials. It thus provides a cost-effective platform for the fabrication of ordered nanostructures on large substrates for a range of applications in nanotechnology. The work has included fabricating hexagonal arrays of TiO2 nanotubes (TNTs) with an excellent crystalline quality by techniques combining anodic aluminum oxide templates and atomic layer deposition (ALD). Absorption spectroscopic analysis showed that the optical absorption band edge of the TNTs exhibited a red shift as the diameter of the nanotubes was tuned to be larger and the distance between two nanotubes became smaller, while the wall thickness of the nanotube was kept constant. Subsequent finite-difference time-domain simulations supported the observation from the theoretical aspect and revealed a large near-field enhancement around the nanotubes for the arrays with densely distributed nanotubes when the corresponding arrays were illuminated. These were results which provided a new perspective on the shift of the optical band gap, which is of significance to research in photoelectronics. In addition, the prepared CdTe/TiO2 core-shell nanowire arrays with various diameters showed an improvement in photoelectrochemical (PEC) water splitting and in photovoltaic properties. By tuning diameters of CdTe/TiO2 nanowire arrays, it was possible to achieve photocurrent as high as 1.1 mA cm-2. Unlike many previously reported heterogeneous photoelectrodes that adopt core/shell configurations and are based on connected UTAMs, in the present work TNTs╫Si and TNWs┼Si heterostructures with a configuration of TiO2 nanotubes or nanowires were prepared vertically rooted into Si substrate for PEC water splitting. The unique structure of the TNTs╫Si heterostructure enabled the PEC performance of TNTs╫Si heterostructures to be among the best of heterogeneous photoelectrodes based on TiO2 and Si, while maintaining excellent structural stability during the water oxidation reaction. In addition, the TNWs┼Si heterostructure served better to enhance the photovoltaic did the TNTs╫Si heterostructures. The fabrication technique enabled such heterostructure arrays to be easily produced on a large scale. Importantly, the fabrication strategy is universal, leaving enough space for structure optimization and selection of the materials for heterostructure arrays, which will benefit solar energy applications." @default.
• W2952802437 created "2019-06-27" @default.
• W2952802437 creator A5088389019 @default.
• W2952802437 date "2016-10-12" @default.
• W2952802437 modified "2023-09-23" @default.
• W2952802437 title "Large area of ultrathin alumina membranes toward innovative heterogeneous nanostructure arrays for solar energy conversion" @default.
• W2952802437 hasPublicationYear "2016" @default.
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