Growth of Nanowire and Nanobelt Based Oxides by Thermal Oxidation with Gallium

Ning

et al. 2015

Sci Rep

Silver is one of the most important materials in plasmonics. Tuning the size of various silver nanostructures has been actively pursued in the last decade. However, silver nanobelt, a typical one-dimensional silver nanostructure, has not been systematically studied as to tuning its size for controllable plasmonic response. Here we show that silver nanobelts, with mean width ranging from 45 to 105 nm and thickness at ca. 13 nm, can grow abundantly on monolithic activated carbon (MAC) through a galvanic-cell reaction mechanism. The widths of silver nanobelts are positively correlated to the growth temperatures. The width/thickness ratio of the silver nanobelts can be adjusted so that their transversal plasmonic absorption peaks can nearly span the whole visible light band, which endows them with different colours. This work demonstrates the great versatility of a simple, green and conceptually novel approach in controlled synthesis of noble metal nanostructures.

Section: Discussionmentioning

confidence: 99%

Tunable growth of silver nanobelts on monolithic activated carbon with size-dependent plasmonic response

Ning

et al. 2015

Sci Rep

“…Since the first report of facile synthesis of CuO nanowires on copper substrate by direct heating in air, considerable attention has been paid to oxide nanowires formation by the thermal oxidation method . The advantages of this method include technical simplicity and compatibility with microfabrication process, as well as large-scale growth capability. − Until now, it has been reported that CuO, ZnO, Fe 2 O 3 , Ga 2 O 3 , and Al nanowires can be prepared by this technique. − …”

Section: Introductionmentioning

confidence: 99%

Large-Scale Synthesis of Bicrystalline ZnO Nanowire Arrays by Thermal Oxidation of Zinc Film: Growth Mechanism and High-Performance Field Emission

Crystal Growth & Design

Zhou

et al. 2013

Understanding the origin crystal nucleation and driving force is critical for the synthesis of one-dimensional nanomaterials with controllable size, morphology, and crystal structure. The growth behavior of ZnO nanowires prepared by thermal oxidation of zinc film is studied. It is found that the grown nanowires have a bicrystalline structure and growth direction significantly different from the commonly observed [0001] direction. On the basis of detailed high resolution morphology and structural analysis, we propose the origin of the initial growth site, as well as the driving force for formation of the bicrystalline structure of aligned ZnO nanowires. The initial zinc film plays an important role in the growth of nanowire. The edge-enhanced oxidation effect of zinc grain initiates the ZnO nanowire nucleation. The strain within the ZnO layer drives and stimulates the nanowire growth. The present study provides insight into the growth mechanism of ZnO nanowires grown from thermal oxidation of zinc film. Field emission measurement results show that the prepared ZnO nanowires have excellent field emission properties. Uniform emission can be obtained and the turn-on field is 7.8 V/μm. The results indicate that the method is advantageous for large-scale synthesis of ZnO nanowires for field emission applications.

Materials Science-Poland

Ga₂O₃ nanowires preparation at atmospheric pressure

Korbutowicz

Stafiniak

Serafińczuk

2017

An attempt has been undertaken to produce gallium oxide nanowires by thermal synthesis from metallic gallium source at atmospheric pressure. Silicon substrates of (1 0 0) and (1 1 1) orientation with and without silicon oxide layers (0.5 µm) were used as support. Evaporated thin gold films were deposited on the top of those silicon carriers as a catalytic agent. After thermal treatment by Rapid Thermal Processing RTP (at various temperatures and times), which was applied to make small Au islands with the diameters of about several tens of nanometers, the substrate surfaces were observed by SEM. The Ga 2 O 3 syntheses were made at various conditions: time, temperature and gas mixture were changed. As a result, monoclinic gallium oxide β-Ga 2 O 3 nanostructures with dominant [1 1 1] and [0 0 2] growth directions were grown. The obtained nanostructures of several tens micrometers length were studied by SEM, PL and X-ray methods.