Vertical Growth of ZnO Nanocone Arrays on Polycarbonate Substrate by Voltage-Assisted Chemical Bath Deposition

Rouhi, J.; Husairi, F.S.; Eswar, Kevin Alvin; Alrokayan, Salman A.H.; Khan, Haseeb A.; Rusop, M.

doi:10.4028/www.scientific.net/AMR.1109.495

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Vertical Growth of ZnO Nanocone Arrays on Polycarbonate Substrate by Voltage-Assisted Chemical Bath Deposition

Abstract:

In this study, ZnO nanocone arrays were grown on polycarbonate (PC) substrate using a voltage-assisted chemical bath deposition in a Zn (NO₃)₂ aqueous solution. To optimize the properties of ZnO nanorods grown on the PC substrate, the effects of current density were examined with respect to the morphological, structural, and photoluminescence properties of the nanorods. Field emission scanning electron microscopy and photoluminescence spectrum confirmed that ZnO nanorod arrays were vertically aligned with highly c-axis oriented, and the sample treated at 0.05 mA had the best crystallization among all samples. Based on the combined results of this study, the vertical ZnO nanocons produced on the PC substrate hold great promise for use in the development of flexible solar cell and other applications.

Info:

Periodical:

Advanced Materials Research (Volume 1109)

Main Theme:

Nanoscience, Nanotechnology, and Nanoengineering: Fundamentals and Applications

Edited by:

Mohamad Hafiz Mamat, Tetsuo Soga and Mohamad Rusop Mahmood

Pages:

495-499

DOI:

10.4028/www.scientific.net/AMR.1109.495

Citation:

J. Rouhi et al., "Vertical Growth of ZnO Nanocone Arrays on Polycarbonate Substrate by Voltage-Assisted Chemical Bath Deposition", Advanced Materials Research, Vol. 1109, pp. 495-499, 2015

Online since:

June 2015

Authors:

J. Rouhi *, F.S. Husairi, Kevin Alvin Eswar, Salman A.H. Alrokayan, Haseeb A. Khan, M. Rusop

Keywords:

Chemical Bath Deposition, Polycarbonate Substrate, ZnO Nanocone Arrays

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References

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Paper TitlePages

Low-Temperature Synthesis and Optical Property of ZnO Nanorod Arrays

Authors: Feng Feng Li, Chao Ling Li, Ming Xi Zhang, Yi Shen

Abstract: Well-aligned ZnO nanorod arrays with 100-200nm diameter and about 1μm length were vertically grown on quartz substrate at relatively low temperature by a solution deposition method. The effects of reactant ratio, water-bath temperature, growth time on crystal structure were discussed. Microstructure of the arrays was investigated using X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM), optical properties were examined using fluorescence spectrophotometer. The results show that a Zn/C₆H₁₂N₄ molar ratio of 1:1, bath temprature 70°C, growth time of 24h are the optimal condition for the preparation of densely distributed ZnO arrays. XRD and FE-SEM analysis confirmed that the ZnO nanorod is a single crystal with a wurtzite structure and the photoluminescence (PL) spectra exhibit coexistence properties of ultraviolet (UV), blue and green emissions.

1605

Electrochemical Synthesis for Uniform and Large-Scale Zinc Oxide Nano Structure Films

Authors: Wen Zhang, Yong Ning He, Wu Yuan Cui, Cheng Bo Zhou

Abstract: Three different kinds of zinc oxide (ZnO) nanostructure films have been synthesized on an indium tin oxide (ITO) glass substrate by electrochemical method with adjusting the concentration of the electrolyte, deposition time and temperature. X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HR-TEM) and photoluminescence (PL) spectrum have been used to determine the characteristics of these nanostructures. The results show that concentration of the electrolyte is one of the most important factors that determine the morphologies of ZnO films. Nanobuds, nanorods, flakes are obtained with the electrolyte concentration increasing. Nanobuds and nanorods have no significant changes with the deposition time prolonged while the flakes grow bigger and thicker. The flakes merge together at high temperature while nanobuds remain unchanged except getting larger and sparser. Nanobuds and nanorods show single crystal patterns while the flakes are composted by multi crystals. The reasons forming such different morphology were discussed according to crystal growth theory. The PL spectra of these ZnO films are quite different according to various microstructures. The film with flake structure has a significant widen near edge emission peak with the depressed visible emission, which may have potential applications on optoelectronic devices and sensors.

429

Formation of ZnO Nanorods via Seeded Growth Hydrothermal Reaction

Authors: Nur Syafinaz Ridhuan, Yeo Pet Fong, Zainovia Lockman, Abdul Razak Khairunisak

Abstract: In this study, ZnO nanorods was formed on a seeded substrates prepared by thermal oxidation of Zn foil followed by hydrothermal reaction. ZnO seed was prepared via thermal oxidation process at 300°C for 10 minutes to form uniform circular nanosize grains that were suitable as a seeded template for the growth of ZnO nanorods via hydrothermal reaction. Several hydrothermal reaction parameters were studied; hydrothermal reaction temperature, ratio of zinc nitrate to hexamethylamine and pH. In hydrothermal reaction, the formation of ZnO nanorods occurs due to thermal degradation of hexamethylamine (HMT) which released hydroxyl ions that react with Zn ions in the precursor solution. Well aligned, ZnO nanorods with length of ~700 nm, base diameter of ~200 nm and top diameter of less than 30 nm needle-like structure were formed on seeded Zn substrate with concentration ratio of zinc nitrate to hexamethylamine 0.1M:0.1M, pH 6-7 at hydrothermal reaction temperature of 80°C

116

Characterization of Urea versus HMTA in the Preparation of Zinc Oxide Nanostructures by Solution-Immersion Method Grown on Gold-Seeded Silicon Substrate

Authors: Azlinda Ab Azlinda, Zuraida Khusaimi, Saifollah Abdullah, Mohamad Rusop

Abstract: Zinc oxide (ZnO) nanostructures prepared by immersion method were successfully grown on gold-seeded silicon substrate using Zinc nitrate hexahydrate (Zn (NO₃)₂.6H₂O) as a precursor, separately stabilized with non-toxic urea (CH₄N₂O) and hexamethylene tetraamine (HMTA). The effect of changing the stabilizer of ZnO solution on the crystal structure, morphology and photoluminescence properties of the resultant ZnO is investigated. X-ray diffraction of the synthesized ZnO shows hexagonal zincite structure. The morphology of the ZnO was characterized using Field Emission Scanning Electron Microscope (FESEM). The growth of ZnO using urea as stabilizer shows clusters of ZnO nanoflower with serrated broad petals were interestingly formed. ZnO in HMTA showed growth of nanorods. The structures has high surface area, is a potential metal oxide nanostructures to be develop for optoelectronic devices and chemical sensors. The formation of ZnO nanostructures is found to be significantly affected by the stabilizer.

Optimisation on the Growth and Alignment of ZnO Nanorods

Authors: Kugalur Shanmugam Ranjith, Ramanathaswamy Pandian, Gomathi Natarajan, Mohammed Kamruddin, Ramasamy Thangavelu Rajendrakumar

Abstract: Synthesis of aligned ZnO nanorods (NRs) is important for electronic and optoelectronic devices. In this work we demonstrate the growth of ZnO nanorods by co-precipitation method using zinc nitrate and hexamine precursors. The samples were characterized by X-ray diffraction analysis, Scanning electron microscopy and Raman spectroscopy. On introducing the seeded substrate into the growth solution, the seeds offer nucleation sites for one-dimensional growth of ZnO nanorods. ZnO nanorod arrays grown on the successive ionic layer adsorption and reaction (SILAR) seed layer found to be irregular and non-uniform due to the etching of the seed substrate by growth solution. However, dip-coated seed substrate yielded uniform growth of ZnO nanostructures. ZnO nanostructures with flower-like morphology were obtained for pH of 9. On reducing the pH of the growth solution the flower morphology transformed into rod-like morphology with rod diameter of 200nm. On reducing the pH to 3 the diameter of the nanorods is decreased to 20 to 25nm. On reducing the precursor concentration the faceted morphology of the nanorods changed into needle-like shape (with sharp tips) along with reduction in diameter (about 20nm). The growth of uniform and vertically aligned ZnO nanorods is observed in dip-coated seed substrate with 5 pH. The results indicate that the diameter of ZnO nanorod array could be controlled by varying the precursor concentration.

319