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Single-atom catalysts by the atomic layer deposition technique

National Science Review 2018年第5期5卷 628-630页

作者： Lei Zhang mohammad norouzi banis Xueliang Sun Department of Mechanical and Materials Engineering The University of Western Ontario

Noble metal nanocatalysts have been widely applied in the petrochemical industry, medicine, environmental protection and energy sectors. To decrease the cost and maximize the utilization efficiency, single-atom catalysts (SACs),as a new frontier in heterogeneous catalysis, have attracted considerable attention due to their unique catalytic

关键词： Pt Single-atom catalysts by the atomic layer deposition technique ALD

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Vanadium oxide assisted synthesis of networked silicon oxide nanowires and their growth dependence

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Particuology 2011年第5期9卷 458-464页

作者： mohammad norouzi banis YongZhang Ruying Li Xueliang Sun xinxiang Jiang Darius Nikanpour Department of Mechanical and Materials Engineering University of Western Ontario London Canada Spacecraft Engineering Space Technologies Canadian Space Agency 6767 route de I＇Aeroport St-Hubert QuebecJ3Y 8Y9 Canada

Networked silicon oxide nanowires have been synthesized by VO2-assisted chemical vapor deposition at 1000 ~C on silicon substrate without supplying any gaseous or liquid Si source. Systematic study on the nanowire growth has indicated that morphology and composition of the final products are sensitive to the catalyst components, reaction atmosphere and temperature. Compared to Au and V02 as catalysts individually, co-catalysts of Au and V02 play a critical role in the formation of networked Si02 nanowires. Transmission electron microscopy （TEM） and scanning electron microscopy （SEM） observations indicate that the silicon oxide nanowires have smooth surfaces with uniform diameters of 30-100 rim, and their lengths reach several hundred micrometers. X-ray photoelectron spectroscopy （XPS） results reveal the atomic ratio of silicon to oxygen is about 1：2. Growth dependence of the networked nanowires on hydrogen and temperature is also discussed. Vapor-liquid-solid （VLS） process is proposed for the growth mechanism of the networked nanowires. It is also found that the growth mechanism of SiO2 nanowires by increasing the temperature up to 1200 ℃ changes to vapor-solid （VS） processes since wire-like structures can be formed without any catalyst or H2 gas introduced into the system.

关键词： Networked SiO2 nanowire CVD Vanadium dioxide Gold

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