Growth of ZnO nanosheets by hydrothermal method on ZnO seed layer coated by spin-coating technique

Denchitcharoen, Somyod; Siriphongsapak, Nontakoch; Limsuwan, Pichet

doi:10.1016/j.matpr.2017.06.108

Cited by 15 publications

(7 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The XRD pattern of Z1 (Figure a) exhibits identical diffraction peaks as JCPSDS file No. 036-1451, and it perfectly coordinates with the hexagonal wurtzite structure of ZnO Figure e represents the XRD pattern for P1, and it shows few intense peaks between 15 and 30° due to some periodic arrangement in polymer chains.…”

Section: Resultsmentioning

confidence: 66%

“…036-1451, and it perfectly coordinates with the hexagonal wurtzite structure of ZnO. 28 Figure 1e represents the XRD pattern for P1, and it shows few intense peaks between 15 and 30°due to some periodic arrangement in polymer chains. This pattern shows few diffraction peaks at 16.6, 21.51, and 24°, which correspond to the (011), (100), and (102) planes, 29−31 and these diffraction peaks arise due to periodicity in PANI chains.…”

Section: Resultsmentioning

confidence: 81%

See 1 more Smart Citation

Oxygen-Vacancy-Dependent Photocatalysis for the Degradation of MB Dye Using UV Light and Observation of Förster Resonance Energy Transfer (FRET) in PANI-Capped ZnO

Chatterjee

Kar

2020

J. Phys. Chem. C

View full text Add to dashboard Cite

In this work, pure ZnO, pure polyaniline (PANI), and a set of PANI-capped ZnO samples of various PANI concentrations are synthesized using the coprecipitation, oxidative polymerization, and ex situ methods, respectively. The X-ray diffraction results exhibit suppression in directional growth and shifting in ZnO-related peak positions in the capped samples with increasing PANI content. Interactions between ZnO and PANI chains are confirmed by Fourier transform infrared (FTIR) spectroscopy. The morphological characterizations (scanning electron microscopy (SEM) and transmission electron microscopy (TEM)) reveal the presence of an agglomerated spherelike structure of PANI on top of ZnO nanosheets. The X-ray photoelectron spectra (XPS) reveal a reduction in the density of surface as well as deep oxygen vacancy defects of ZnO after capping with PANI. The absorption spectra reveal an enhancement in the bipolaron band absorption for capped samples, which reinforces the presence of PANI chains. The photoluminescence spectra show a quenching in the emission intensity of ZnO after the addition of PANI; the overall quenching is discussed through concentration-dependent Förster resonance energy transfer (FRET) theory between ZnO (donor) and PANI (acceptor) between ZnO (donor) and PANI (acceptor). The sample capped with the least PANI content shows maximum quenching in the emission profile due to the encounter among the intradonor and the inter-donor–acceptor energy transfer mechanism. For rest of the capped samples, emissions are explained using the concentration-dependent inter-donor–acceptor FRET theory. Finally, the catalytic study of all capped samples and pure ZnO is performed through the degradation of methylene blue (MB) dye by irradiating UV light. Despite having quenched photoluminescence intensity, the results show a reduction in degradation efficiency for PANI-capped ZnO compared to pure ZnO contrary to the common trend. This is associated with the change in the density of oxygen vacancy sites of ZnO. Of the two oxygen vacancy sites, the surface oxygen vacancy sites play a major role as carrier trap centers and the deep oxygen vacancy sites delay the recombination process. The mechanism behind the effect of change in the density of these two vacancy types on photocatalysis is explained. Thus, by concentration-dependent FRET between ZnO and PANI and the oxygen vacancy defect density, the emission intensity and the photocatalytic activity of PANI-capped ZnO can be tuned.

show abstract

Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 81%

Oxygen-Vacancy-Dependent Photocatalysis for the Degradation of MB Dye Using UV Light and Observation of Förster Resonance Energy Transfer (FRET) in PANI-Capped ZnO

Chatterjee

Kar

2020

J. Phys. Chem. C

View full text Add to dashboard Cite

show abstract

“…29 One of the major advantages of ZnO is that it can be easily synthesized in different shapes like one-(1D), two-(2D), and three-dimensional (3D) nano-structures. Some of them include nanorods, 30 -helixes, 31 -springs and -rings, 32 -needles, 33 -ribbons, 34 -tubes, 35 -wires, 36 -sheets, 37 and tetrapods. 38 Due to the low cost and accessibility of a large variety of 3D shapes inherent to ZnO nanostructures, the material is intensively investigated in antimicrobial 39,40 and other biomedical applications such as cell imaging, biosensing, and drug delivery.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Protein-corona formation on aluminum doped zinc oxide and gallium nitride nanoparticles

Ciobanu

Roncari

Ceccone

et al. 2022

Journal of Applied Biomaterials & Functional Materials

View full text Add to dashboard Cite

The interaction of semiconductor nanoparticles with bio-molecules attracts increasing interest of researchers, considering the reactivity of nanoparticles and the possibility to control their properties remotely giving mechanical, thermal, or electrical stimulus to the surrounding bio-environment. This work reports on a systematic comparative study of the protein-corona formation on aluminum doped zinc oxide and gallium nitride nanoparticles. Bovine serum albumin was chosen as a protein model. Dynamic light scattering, transmission electron microscopy and X-ray photoelectron spectroscopy techniques have been used to demonstrate the formation of protein-corona as well as the stability of the colloidal suspension given by BSA, which also works as a surfactant. The protein adsorption on the NPs surface studied by Bradford Assay showed the dependence on the quantity of proteins adsorbed to the available sites on the NPs surface, thus the saturation was observed at ratio higher than 5:1 (NPs:Proteins) in case of ZnO, these correlating with DLS results. Moreover, the kinetics of the proteins showed a relatively fast adsorption on the NPs surface with a saturation curve after about 25 min. GaN NPs, however, showed a very small amount of proteins adsorbed on the surface, a change in the hydrodynamic size being not observable with DLS technique or differential centrifugal sedimentation. The Circular Dichroism analysis suggests a drastic structural change in the secondary structure of the BSA after attaching on the NPs surface. The ZnO nanoparticles adsorb a protein-corona, which does not protect them against dissolution, and in consequence, the material proved to be highly toxic for Human keratinocyte cell line (HaCaT) at concentration above 25 µg/mL. In contrast, the GaN nanoparticles which do not adsorb a protein-corona, show no toxicity signs for HaCaT cells at concentration as high as 50 µg/mL, exhibiting much lower concentration of ions leakage in the culture medium as compared to ZnO nanoparticles.

show abstract

“…In hydrothermal methods, the parameters like working temperature, pressure and solution composition, influence the type and morphology of resulting nanostructures [15]. Among various advantages of hydrothermal method include the cost effective development of different sorts of crystal structures, capacity to make crystalline stages which are not steady at the melting point and the nano-strucural growth of materials having high vapor pressures close to their softening points [16]. One of the drawback of hydrothermal technique is the impossibility of watching the growing crystals during structure development [17].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Various Nano-Structural Morphologies of Zinc Oxide for their Applications in Dye-Sensitized Solar Cells

Karim

Ahmed

Haq

et al. 2018

KEM

View full text Add to dashboard Cite

In the current study, various morphologies of zinc oxide (ZnO) including nanorods, nanoflowers, nanosheets/flakes, nanospherical particles, nanohexagonal sheets, and nanoneedles have been prepared by using single step and two-step hydrothermal processes with optimized parameters such as growth temperature, growth time and compositions of both the seed and growth solutions. Fluorine doped tin oxide (FTO) coated glass was used as the substrate. The prepared morphologies were characterized with the help of scanning electron microscopy (SEM) and the purity of nanostructures was confirmed by elemental analysis (EDX). These nanostructures were used as photo-anode material to fabricate the DSSC using a dye (Rhodamine B) for enhancing the range of solar spectrum that is to be adsorbed. Finally the fabricated solar cells were characterized in terms of their efficiency, gauged by their fill factor. Among different morphologies investigated as photo anode materials; nanosheets/flakes were found to be showing maximum efficiency, with fill factor values around 0.5 due to their larger surface area, better porosity and enhanced capability of light trapping and scattering.

show abstract

Growth of ZnO nanosheets by hydrothermal method on ZnO seed layer coated by spin-coating technique

Cited by 15 publications

References 9 publications

Oxygen-Vacancy-Dependent Photocatalysis for the Degradation of MB Dye Using UV Light and Observation of Förster Resonance Energy Transfer (FRET) in PANI-Capped ZnO

Oxygen-Vacancy-Dependent Photocatalysis for the Degradation of MB Dye Using UV Light and Observation of Förster Resonance Energy Transfer (FRET) in PANI-Capped ZnO

Protein-corona formation on aluminum doped zinc oxide and gallium nitride nanoparticles

Investigation of Various Nano-Structural Morphologies of Zinc Oxide for their Applications in Dye-Sensitized Solar Cells

Contact Info

Product

Resources

About