scholarly journals Synthesis and characterisation of copper vanadate quantum dots / nanostructured zinc oxide

2021 ◽  
Vol 2053 (1) ◽  
pp. 012004
Author(s):  
W Q Wee ◽  
L C Sim ◽  
K H Leong ◽  
P Saravanan
Keyword(s):  
Quantum Dots ◽  
Zinc Oxide ◽  
Zno Nanorods ◽  
Suitable Alternative ◽  
X Ray ◽  
Nanostructured Zinc Oxide ◽  
Increasing Trend ◽  
Ftir Spectrometer ◽  
Copper Vanadate

Abstract 0D/3D heterojunction photocatalyst, specifically copper vanadate (CuVA) quantum dots (0D) / nanostructured zinc oxide (ZnO) (3D), has been prepared using in-situ reaction method. pH of 8 yielded the optimum nanostructure for the hydrothermal synthesis of ZnO nanorods. Characterisation of heterojunction photocatalysts obtained using Fourier transform infrared (FTIR) spectrometer, scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) analysis indicates that this method is effective for incorporating quantum dots (QDs) onto ZnO. FTIR at wavenumber 3537, 1360 and 734 cm−1 showed a decreasing transmission peak as the amount of CuVA increases with respect to ZnO. EDX had showed an increasing trend in copper and vanadium elemental percentage in CuVA-ZnO as the targeted CuVA loading increases. 30 wt% CuVA QDs loaded onto ZnO was found to be the optimal mass loading to degrade sulfadiazine (SDZ), at 17.01% with initial concentration of 10 mgL−1. This work is expected to provide a suitable alternative as a photocatalyst to degrade pollutants, with antibiotics being the focus of this work.

In situ sulfur K-edge X-ray absorption spectroscopy of the reaction of zinc oxide with hydrogen sulfide

1996 ◽  
pp. 1431 ◽  
Author(s):  
John Evans ◽  
Judith M. Corker ◽  
Clive E. Hayter ◽  
Richard J. Oldman ◽  
B. Peter Williams
Keyword(s):  
Zinc Oxide ◽  
Hydrogen Sulfide ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Characterization of Ti/SnO2 Interface by X-ray Photoelectron Spectroscopy

Nanomaterials ◽  
2022 ◽  
Vol 12 (2) ◽  
pp. 202
Author(s):  
Miranda Martinez ◽  
Anil R. Chourasia
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Chemical Interaction ◽  
Photoelectron Spectra ◽  
X Ray ◽  
Increasing Trend ◽  
Substrate Temperatures ◽  
Beam Technique

The Ti/SnO2 interface has been investigated in situ via the technique of x-ray photoelectron spectroscopy. Thin films (in the range from 0.3 to 1.1 nm) of titanium were deposited on SnO2 substrates via the e-beam technique. The deposition was carried out at two different substrate temperatures, namely room temperature and 200 °C. The photoelectron spectra of tin and titanium in the samples were found to exhibit significant differences upon comparison with the corresponding elemental and the oxide spectra. These changes result from chemical interaction between SnO2 and the titanium overlayer at the interface. The SnO2 was observed to be reduced to elemental tin while the titanium overlayer was observed to become oxidized. Complete reduction of SnO2 to elemental tin did not occur even for the lowest thickness of the titanium overlayer. The interfaces in both the types of the samples were observed to consist of elemental Sn, SnO2, elemental titanium, TiO2, and Ti-suboxide. The relative percentages of the constituents at the interface have been estimated by curve fitting the spectral data with the corresponding elemental and the oxide spectra. In the 200 °C samples, thermal diffusion of the titanium overlayer was observed. This resulted in the complete oxidation of the titanium overlayer to TiO2 upto a thickness of 0.9 nm of the overlayer. Elemental titanium resulting from the unreacted overlayer was observed to be more in the room temperature samples. The room temperature samples showed variation around 20% for the Ti-suboxide while an increasing trend was observed in the 200 °C samples.

Zinc Oxide Nanorods Characteristics Prepared by Sol-Gel Immersion Method Immersed at Different Times

2013 ◽  
Vol 667 ◽  
pp. 375-379 ◽  
Author(s):  
M. Awalludin ◽  
Mohamad Hafiz Mamat ◽  
Mohd Zainizan Sahdan ◽  
Z. Mohamad ◽  
Mohamad Rusop
Keyword(s):  
Electron Microscopy ◽  
Zinc Oxide ◽  
Immersion Time ◽  
Sol Gel ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Immersion Method ◽  
X Ray ◽  
Oxide Nanorods ◽  
Scanning Electron

This paper focus on zinc oxide (ZnO) nanorods prepared using sol-gel immersion method immersed at different time. Immersion times have been varied 1~24 hr and the characteristics of each sample have been observed. The effects of immersion time on ZnO nanorods thin films have been studied in surface morphology and structural properties using Scanning Electron Microscopy (SEM) and X-ray diffractometer (XRD), respectively.

scholarly journals Green Synthesis of Luminescent Gold-Zinc Oxide Nanocomposites: Cell Imaging and Visible Light–Induced Dye Degradation

2021 ◽  
Vol 9 ◽  
Author(s):  
Kanika Bharti ◽  
Shahbaz Ahmad Lone ◽  
Ankita Singh ◽  
Sandip Nathani ◽  
Partha Roy ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Visible Light ◽  
Green Synthesis ◽  
Photoelectron Spectroscopy ◽  
Sodium Citrate ◽  
Dye Degradation ◽  
X Ray ◽  
Long Duration ◽  
Solvent Free Conditions

Green synthesis of gold-zinc oxide (Au-ZnO) nanocomposite was successfully attempted under organic solvent–free conditions at room temperature. Prolonged stirring of the reaction mixture introduced crystallinity in the ZnO phase of Au-ZnO nanocomposites. Luminescence properties were observed in these crystalline Au-ZnO nanocomposites due to in situ embedding of gold nanoparticles (AuNP) of 5–6 nm diameter on the surface. This efficient strategy involved the reduction of Au(III) by Zn(0) powder in aqueous medium, where sodium citrate (NaCt) was the stabilizing agent. Reaction time and variation of reagent concentrations were investigated to control the Au:Zn ratio within the nanocomposites. The reaction with the least amount of NaCt for a long duration resulted in Au-ZnO/Zn(OH)2 nanocomposite. X-ray photoelectron spectroscopy (XPS) confirmed the formation of Zn(OH)2 and ZnO in the same nanocomposite. These nanocomposites were reconnoitered as bioimaging materials in human cells and applied for visible light–induced photodegradation of rhodamine-B dye.

Colloidal PbS quantum dot stacking kinetics during deposition via printing

2020 ◽  
Vol 5 (5) ◽  
pp. 880-885 ◽  
Author(s):  
Wei Chen ◽  
Haodong Tang ◽  
Nian Li ◽  
Manuel A. Scheel ◽  
Yue Xie ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Grazing Incidence ◽  
Self Organization ◽  
Drying Process ◽  
Two Phase ◽  
Organization Behavior ◽  
X Ray ◽  
X Ray Scattering ◽  
Pbs Quantum Dot

The particle self-organization behavior of small-sized quantum dots is studied in situ with grazing-incidence small-angle X-ray scattering and during the drying process two phase transitions are found.

Strain and composition of ultrasmall Ge quantum dots studied by x-ray scattering and in situ surface x-ray absorption spectroscopy

2006 ◽  
Vol 99 (6) ◽  
pp. 063510 ◽  
Author(s):  
R. Dujardin ◽  
V. Poydenot ◽  
T. U. Schülli ◽  
G. Renaud ◽  
O. Ulrich ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Scattering ◽  
Ge Quantum Dots ◽  
X Ray Absorption ◽  
Ray Scattering

Determination of Morphology of Poly(3-hexythiophene) with Nanosphere- and Nanorod-Shape of Zinc Oxide

2014 ◽  
Vol 925 ◽  
pp. 304-307
Author(s):  
Azyuni Aziz ◽  
Fatin Hana Naning ◽  
Syed Abdul Malik ◽  
Reza Zamiri
Keyword(s):  
Zinc Oxide ◽  
Spin Coating ◽  
Emission Spectroscopy ◽  
Quartz Substrate ◽  
Zno Nanorods ◽  
Zno Thin Films ◽  
X Ray ◽  
Scanning Electron ◽  
Better Than

Morphology of thin film poly (3-hexylthiophene) (P3HT) embedded with nanosphere-and nanorod-shape Zinc Oxide (ZnO) has been studied. We deposited the materials on quartz substrate using spin coating technique. The morphology of P3HT: ZnO thin films were investigated using Field Emission Scanning Electron Microscopy (FESEM), Energy-dispersive X-ray emission spectroscopy (EDX) and RAMAN Spectroscopy and compared. Based on size and shape of both ZnO, it can be seen that nanospheres in P3HT was found to be better than ZnO nanorods in P3HT.

The formation of CdS quantum dots and Au nanoparticles

2017 ◽  
Vol 232 (1-3) ◽  
Author(s):  
Andreas Schiener ◽  
Ella Schmidt ◽  
Christoph Bergmann ◽  
Soenke Seifert ◽  
Dirk Zahn ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Au Nanoparticles ◽  
Early Stage ◽  
Reaction Times ◽  
Cds Quantum Dots ◽  
Saxs Data ◽  
X Ray ◽  
Free Jet ◽  
In The Beginning

AbstractWe report on microsecond-resolved in-situ SAXS experiments of the early nucleation and growth behavior of both cadmium sulfide (CdS) quantum dots in aqueous solution including the temperature dependence and of gold (Au) nanoparticles. A novel free-jet setup was developped to access reaction times as early as 20 μs. As the signal in particular in the beginning of the reaction is weak the containment-free nature of this sample environment prooved crucial. The SAXS data reveal a two-step pathway with a surprising stability of a structurally relaxed cluster with a diameter of about 2 nm. While these develop rapidly by ionic assembly, a further slower growth is attributed to cluster attachment. WAXS diffraction confirms, that the particles at this early stage are not yet crystalline. This growth mode is confirmed for a temperature range from 25°C to 45°C. An energy barrier for the diffusion of primary clusters in water of 0.60 eV was experimentally observed in agreement with molecular simulations. To access reaction times beyond 100 ms, a stopped-drop setup -again contaiment- free is introduced. SAXS experiments on the growth of Au nanoparticles on an extended time scale provide a much slower growth with one population only. Further, the influence of ionizing X-ray radiation on the Au particle fromation and growth is discussed.

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