Direct growth of ZnO crystals on various Cu substrates by Cu-catalyzed chemical bath deposition

CrystEngComm ◽  
2019 ◽  
Vol 21 (15) ◽  
pp. 2476-2480 ◽  
Author(s):  
Tsutomu Shinagawa ◽  
Hisaya Takahashi ◽  
Masanobu Izaki
Keyword(s):  
Aqueous Solution ◽  
Chemical Bath Deposition ◽  
Zinc Nitrate ◽  
Catalytic Action ◽  
Ambient Atmosphere ◽  
Dimethylamine Borane ◽  
Cu Substrates ◽  
Direct Growth

By the catalytic action of Cu on DMAB, ZnO crystals grow directly on various Cu substrates immersed in an aqueous solution containing zinc nitrate and dimethylamine borane at 80 °C under an ambient atmosphere.

Growth of Highly Orientated and Well-Aligned ZnO Nanowhiskers Using Aqueous Solutions

2009 ◽  
Vol 620-622 ◽  
pp. 477-480
Author(s):  
Xiu Lan Hu ◽  
Yoshitake Masuda ◽  
Tatsuki Ohji ◽  
Kazumi Kato
Keyword(s):  
Aqueous Solution ◽  
Aqueous Solutions ◽  
Zinc Nitrate ◽  
Zinc Nitrate Hexahydrate ◽  
Nitrate Hexahydrate ◽  
Single Crystalline ◽  
Conductive Glass ◽  
Branched Polyethylenimine

Length-tailored, monodisperse, highly orientated, single-crystalline hexagonal and aligned ZnO nanowhiskers were grown onto F-doped SnO2 conductive glass (FTO) substrate at 88 °C using an aqueous solution. The aqueous solution for growth of ZnO nanowhiskers included zinc nitrate hexahydrate, hexamethylenetetramine and polyethylenimine. The addition of branched polyethylenimine, which may be adsorbed on the nonpolar surface of ZnO crystals, improved the growth of ZnO nanowhiskers along the c-axis.

Effects of Precursor Concentration on Hexagonal Structures of ZnO Nanorods Grown by Aqueous Solution Method

2013 ◽  
Vol 770 ◽  
pp. 120-123
Author(s):  
P. Limnonthakul ◽  
C. Chananonnawathorn ◽  
K. Aiempanakit ◽  
J. Kaewkhao ◽  
P. Eiamchai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Solution Method ◽  
Zno Nanorods ◽  
Zinc Nitrate ◽  
Precursor Concentration ◽  
Nanorod Arrays ◽  
Number Density ◽  
X Ray ◽  
Aqueous Solution Method ◽  
Axial Growth

The ZnO nanorods were fabricated on top of the seeded gold layer by the aqueous solution method with the solution of zinc nitrate and hexamethylenetetramine (HTMA) at 90°C for 24 hours. The variety of the ZnO nanorods were prepared and investigated based on the precursor concentrations, in a range of 1 to 40 mM. The physical morphologies and crystal structures were characterized by field-emission scanning electron microscopy (FE-SEM) and X-ray diffractometry (XRD), respectively. The results showed that, with the small precursor concentrations, the lateral growth of the nanorods was highly significant when compared to their axial growth. The precursor concentration of 20 mM was best optimized for the preparation of the ZnO nanorod arrays with the hexagonal structures at the highest rod diameter and length. At the higher concentrations, although the nanorod size remained nearly constant, the length was however rapidly decreased. Further analyses also proved that, with the increased precursor concentrations, the number density of the ZnO nanorods was progressively increased along with the more complete hexagonal wurtzite structures.

Growth Behaviour of ZnO on Si (100) and Platinum Coated Glass Substrate from Aqueous Solution

2010 ◽  
Vol 97-101 ◽  
pp. 1550-1553 ◽  
Author(s):  
M.A. Bakar ◽  
Muhammad Azmi Abd Hamid ◽  
A. Jalar
Keyword(s):  
Aqueous Solution ◽  
Glass Substrate ◽  
Substrate Surface ◽  
Zno Nanorods ◽  
Zinc Nitrate ◽  
Zinc Oxide Nanorods ◽  
Growth Time ◽  
Nitrate Hexahydrate ◽  
Coated Glass Substrate ◽  
Coated Glass

Zinc oxide nanorods were grown on Si (100) and Platinum coated glass substrate by the aqueous chemical growth (ACG) in aqueous solution that contained zinc nitrate hexahydrate (Zn(NO3)2•6H20) and hexamethylenetetramine (C6H12N4). The obtained ZnO nanorods are uniformly distributed on the Platinum coated glass substrate surface from 1.5 h to 3 h growth time. Branched hexagonal rods were also found growth on these uniform nanorods. Branched hexagonal rods were found on Si (100) from 2 h to 3 h growth time. A small number of flower-like structures compared to the majority oval type structure suggest that secondary nucleation had occurred during the process of growth. All of the high intensity peaks, including the strong (101) peak, are assigned to wurtzite ZnO hexagonal indicating that the product is pure ZnO. The results found in this study revealed that the type substrate plays a role in determining the surface morphology of ZnO growth.

scholarly journals Direct Growth of ZnO Whiskers Bridging between Micron-Gap Electrodes in Aqueous Solution

2007 ◽  
Vol 56 (3) ◽  
pp. 278-281
Author(s):  
Keisuke KAMETANI ◽  
Hérve DUMONT ◽  
Hiroshi IMAMOTO ◽  
Shizuo FUJITA
Keyword(s):  
Aqueous Solution ◽  
Direct Growth

Controlling the Crystallite Size of Zinc Oxide Nanorods via Chemical Bath Deposition and Post-Hydrothermal Treatment

2013 ◽  
Vol 737 ◽  
pp. 28-32 ◽  
Author(s):  
Amalia Sholehah ◽  
Akhmad Herman Yuwono ◽  
Cyndi Rinaldi Rimbani
Keyword(s):  
Crystallite Size ◽  
Hydrothermal Treatment ◽  
Chemical Bath Deposition ◽  
Zno Nanorods ◽  
Visible Region ◽  
Band Gap Energy ◽  
Zinc Nitrate ◽  
Hexagonal Structure ◽  
Zinc Oxide Nanorods ◽  
Ito Glass

ZnO nanorods were deposited on ITO glass substrate via chemical bath deposition at low temperature of 90°C. The seeding solution was made by dissolving zinc nitrate tetrahydrate and methenamine in cool water (5°C). The as-synthesized ZnOs were further subjected to post-hydrothermal treatment series.The results of scanning electron microscope (SEM) studies showed that the ZnO nanorods were grown as vertically-aligned hexagonal structure, while x-ray diffraction (XRD) patterns showed a high intensity of [002] peak. The absorption spectra of the as-synthesized sample indicated a strong absorption peak near the UV region. After post-hydrothermal treatments, the absorption was slightly shifted to visible region. The ZnO nanorods sample derived from post-hydrothermal treatment at 150°C for 12 hours has the largest crystallite size of 269.402 nm and the lowest band gap energy, Egvalue of 3.205 eV.

Densification process in undoped zinc oxide

1987 ◽  
Vol 2 (4) ◽  
pp. 478-484 ◽  
Author(s):  
K. Kobayashi ◽  
P. Dordor ◽  
J. P. Bonnet ◽  
R. Salmon ◽  
P. Hagenmuller
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Initial Density ◽  
Close Relation ◽  
Zinc Nitrate ◽  
Densification Process ◽  
Final Density ◽  
Extreme Sensitivity ◽  
Sintering Conditions ◽  
Scanning Electron

An original preparation of ZnO is described where the powder is obtained by precipitaton from zinc nitrate in aqueous solution followed by a calcination. Scanning electron microscopy reveals a close relation between the initial density and the morphology of the powder, the latter being also strongly dependent on the calcining conditions. The investigation of the densification process shows the extreme sensitivity of the final density to sintering conditions. A physical model based on the competitive influences of shrinkage and evaporation successfully describes the observed phenomena.

scholarly journals Precipitation of Zinc Oxide Nanoparticles in Bicontinuous Microemulsions

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Liliana E. Romo ◽  
Hened Saade ◽  
Bertha Puente ◽  
Ma. Luisa López ◽  
Rebeca Betancourt ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zinc Oxide ◽  
Sodium Hydroxide ◽  
Zinc Oxide Nanoparticles ◽  
Sodium Dodecyl ◽  
Particle Diameter ◽  
Average Diameter ◽  
Zinc Nitrate ◽  
Oxide Nanoparticles ◽  
Sulfosuccinate Sodium

Zinc oxide nanoparticles were obtained directly, avoiding the calcination step, by precipitation at 70°C in bicontinuous microemulsions stabilized with a mixture of surfactants sodium bis (2-ethylhexyl) sulfosuccinate/sodium dodecyl sulfate (2/1, wt./wt.) containing 0.7 M zinc nitrate aqueous solution. Two concentrations of aqueous solution of precipitating agent sodium hydroxide were used under different dosing times on microemulsion. Characterization by X-ray diffraction and electron microscopy allowed us to identify particles with an acicular rod-like morphology and a hexagonalwurtzitecrystal structure as small as 8.5 and 30 nm in average diameter and length, respectively. Productivities much higher than those typical in the preparation of zinc oxide nanoparticles via reverse microemulsions were obtained. Particle size was the same at the two studied sodium hydroxide concentrations, while it increases as dosing time of the precipitant agent increases. It is believed that the surfactant film on the microemulsion channels restricts the particle diameter growth.

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