Growth of flower-like ZnO via surfactant-free hydrothermal synthesis on ITO substrate at low temperature

We report a new production pathway for a variety of metal oxide nanocrystallites via submerged illumination in water: submerged photosynthesis of crystallites (SPSC). Similar to the growth of green plants by photosynthesis, nanocrystallites shaped as nanoflowers and nanorods are hereby shown to grow at the protruded surfaces via illumination in pure, neutral water. The process is photocatalytic, accompanied with hydroxyl radical generation via water splitting; hydrogen gas is generated in some cases, which indicates potential for application in green technologies. Together with the aid of ab initio calculation, it turns out that the nanobumped surface, as well as aqueous ambience and illumination are essential for the SPSC method. Therefore, SPSC is a surfactant-free, low-temperature technique for metal oxide nanocrystallites fabrication.

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“…The apical growth direction was in the c-axis <001>. This result is consistent with previous ZnO crystal growth reports242627.…”

Section: Resultssupporting

confidence: 91%

A pathway of nanocrystallite fabrication by photo-assisted growth in pure water

Jeem

Julaihi

Ishioka

et al. 2015

Sci Rep

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“…Arya et al [15] demonstrated that ZnO crystals exhibit different biosensor properties corresponding to their shape changes. Up to now, many different ZnO micro and nanostructures have been reported [16][17][18][19][20][21]. However, developing a facile, environment-friendly method to synthesize ZnO crystals with well defined complex morphology is still a major challenge.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of hierarchical ZnO microstructures with enhanced photocatalytic activity

Miao

Shi

Nawrat

et al. 2017

Materials Science-Poland

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Flower-like ZnO microstructures were successfully synthesized via a facile hydrothermal route without using any surfactants. The morphology of these microstructures can be easily controlled by adjusting the pH of the reaction solution. The possible growth mechanism of ZnO hierarchical microstructures was proposed based on the X-ray powder diffraction (XRD) and scanning electron microscope (SEM) results. The photocatalytic activity studies of ZnO nanocrystals demonstrated their excellent photocatalytic performance in degrading aqueous methylene blue (MB) under UV-A light irradiation. This higher photocatalytic activity of the ZnO nanoplates was mainly attributed to the exposed facets with the higher surface energy.

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“…ZnO nanorods and flowers are the promising materials for various types of sensor applications due to their ultrahigh surface-to-volume ratios. Some workers [13][14][15][16][17][18][19][20][21] have carefully studied the gas sensing characteristics of ZnO nanowires. ZnO nanorod photodetectors with Mg dopping have been reported.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of ZnO flower-like structures

Sharma¹,

Sharma²,

Sharma³

2016

Smart Science

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The flower-like ZnO nanorods have been successfully synthesized by a surfactant-assisted hydrothermal method. The nanostructures formed by ZnO nanorods were synthesized and deposited without seeding in glass flask by a hexamethylenetetramine (HMTA)-assisted hydrothermal method at low temperature with NaOH as surfactant and catalyst. The synthesized ZnO flowers comprise of several spike structures that have hexagonal cross section and taper toward the end. The structures are investigated using X-ray diffraction, scanning electron microscope and transmission microscope. The optical properties are studied with UV-VIS, FTIR, and Raman spectroscopy. The process of synthesis is simple and highly reproducible. The synthesized flower-like structures are suitable for use as sensors applications.

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Growth of flower-like ZnO via surfactant-free hydrothermal synthesis on ITO substrate at low temperature

Cited by 77 publications

References 59 publications

A pathway of nanocrystallite fabrication by photo-assisted growth in pure water

A pathway of nanocrystallite fabrication by photo-assisted growth in pure water

Facile synthesis of hierarchical ZnO microstructures with enhanced photocatalytic activity

Synthesis and characterization of ZnO flower-like structures

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