Growth kinetics and surface properties of single-crystalline aluminum-doped zinc oxide nanowires on silicon substrates

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Title:	Growth kinetics and surface properties of single-crystalline aluminum-doped zinc oxide nanowires on silicon substrates
Authors:	鄭紹良;Cheng, S.L.;Liao, S.Y.;Syu, J.H.
Contributors:	工學院化學工程與材料工程學系
Keywords:	Activation energy;Al-doped ZnO nanowires;Antireflection;Growth kinetic;Wettability
Date:	2016-03-01
Issue Date:	2026-04-21 14:49:09 (UTC+8)
Publisher:	Elsevier Ltd.;Elsevier Ltd
Abstract:	摘要： We present here the results from a systematic investigation on the growth kinetics and surface properties of Al-doped ZnO (AZO) nanowires synthesized on (001)Si substrates under different hydrothermal conditions. The as-synthesized vertical AZO nanowires exhibited a hydrophilic characteristic and their crystal structures were determined to be perfectly single crystalline with the axis of the wire parallel to the [0001] direction. TEM and EDS results revealed that the as-synthesized AZO nanowires have tapered tips, and the Al-doped concentration in the AZO nanowires was about 1.6at%. After a series of SEM examinations, the average length of AZO nanowires synthesized at each temperature studied was found to follow a linear relationship with the reaction time, indicating that the hydrothermal growth of AZO nanowires was a reaction-controlled process. The activation energy for linear growth of AZO nanowires on Si substrate, as obtained from an Arrhenius plot, was found to be about 46kJ/mol. From UV–vis spectroscopic measurements, it was found that the Si substrate coated with vertically-aligned AZO nanowire arrays exhibited remarkably reduced reflectance (10–12%) over a wide range of visible wavelengths (400–800nm) and angles of light incidence (8–60°). The good broadband and omnidirectional antireflection characteristics can be attributed to the light trapping effect and the graded refractive index resulting from the tapered AZO nanowire structures. 出版者： Elsevier Ltd 出版日期： 2016-03-01 出處： Ceramics international, 2016-03, Vol.42 (4), p.5271-5277 版權： 2015 Elsevier Ltd and Techna Group S.r.l. 識別號： ISSN: 0272-8842 識別號： EISSN: 1873-3956 識別號： DOI: 10.1016/j.ceramint.2015.12.055
Appears in Collections:	[Department of Chemical and Materials Engineering] journal & Dissertation

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