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Keywords = seedless hydrothermal growth

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13 pages, 1926 KiB  
Article
Direct One-Step Seedless Hydrothermal Growth of ZnO Nanostructures on Zinc: Primary Study for Photocatalytic Roof Development for Rainwater Purification
by Marie Le Pivert, Aurélie Piebourg, Stéphane Bastide, Myriam Duc and Yamin Leprince-Wang
Catalysts 2022, 12(10), 1231; https://doi.org/10.3390/catal12101231 - 14 Oct 2022
Cited by 6 | Viewed by 1894
Abstract
To shift towards the greener city, photocatalytic urban infrastructures have emerged as a promising solution for pollution remediation. To reach this goal, the large bandgap semiconductors, such as nontoxic Zinc Oxide (ZnO), already proved their excellent photocatalytic performances. However, integrating and developing cost-effective [...] Read more.
To shift towards the greener city, photocatalytic urban infrastructures have emerged as a promising solution for pollution remediation. To reach this goal, the large bandgap semiconductors, such as nontoxic Zinc Oxide (ZnO), already proved their excellent photocatalytic performances. However, integrating and developing cost-effective and greener photocatalytic surfaces with an easily scaled-up synthesis method and without energy and chemical product overconsumption is still challenging. Therefore, this work proposes to develop a depolluting Zinc (Zn) roof covered by ZnO nanostructures (NSs) using a one-step seedless hydrothermal growth method in 2 h. The feasibility of this synthesis was firstly studied on small areas of Zn (1.25 cm2) before being scaled up to medium-sized areas (25 cm2). The efficiency of this functionalization route for ZnO NSs grown without seed layer was attributed to the presence of Zn2+ sites and the native oxide film on the Zn surface. Their photocatalytic efficiency was demonstrated by removing in less than 3 h the Methylene Blue (MB) and Acid Red 14 (AR14) in both DI water and rainwater under UV-light. Promising results were also recorded under solar light. Therefore, the photocatalytic Zn roof functionalized by ZnO NSs is a promising route for rainwater purification by photocatalysis. Full article
(This article belongs to the Special Issue Catalytic Processes for Water and Wastewater Treatment)
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22 pages, 5603 KiB  
Article
Seedless Hydrothermal Growth of ZnO Nanorods as a Promising Route for Flexible Tactile Sensors
by Ilaria Cesini, Magdalena Kowalczyk, Alessandro Lucantonio, Giacomo D’Alesio, Pramod Kumar, Domenico Camboni, Luca Massari, Pasqualantonio Pingue, Antonio De Simone, Alessandro Fraleoni Morgera and Calogero Maria Oddo
Nanomaterials 2020, 10(5), 977; https://doi.org/10.3390/nano10050977 - 19 May 2020
Cited by 17 | Viewed by 4930
Abstract
Hydrothermal growth of ZnO nanorods has been widely used for the development of tactile sensors, with the aid of ZnO seed layers, favoring the growth of dense and vertically aligned nanorods. However, seed layers represent an additional fabrication step in the sensor design. [...] Read more.
Hydrothermal growth of ZnO nanorods has been widely used for the development of tactile sensors, with the aid of ZnO seed layers, favoring the growth of dense and vertically aligned nanorods. However, seed layers represent an additional fabrication step in the sensor design. In this study, a seedless hydrothermal growth of ZnO nanorods was carried out on Au-coated Si and polyimide substrates. The effects of both the Au morphology and the growth temperature on the characteristics of the nanorods were investigated, finding that smaller Au grains produced tilted rods, while larger grains provided vertical rods. Highly dense and high-aspect-ratio nanorods with hexagonal prismatic shape were obtained at 75 °C and 85 °C, while pyramid-like rods were grown when the temperature was set to 95 °C. Finite-element simulations demonstrated that prismatic rods produce higher voltage responses than the pyramid-shaped ones. A tactile sensor, with an active area of 1 cm2, was fabricated on flexible polyimide substrate and embedding the nanorods forest in a polydimethylsiloxane matrix as a separation layer between the bottom and the top Au electrodes. The prototype showed clear responses upon applied loads of 2–4 N and vibrations over frequencies in the range of 20–800 Hz. Full article
(This article belongs to the Special Issue ZnO Based Nanostructures: Synthesis, Characterization and Applications)
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