scholarly journals Ultraviolet Radiation Sensor Based on ZnO Nanorods/La3Ga5SiO14 Microbalance

Sensors ◽  
2021 ◽  
Vol 21 (12) ◽  
pp. 4170
Author(s):  
Dmitry Roshchupkin ◽  
Arkady Redkin ◽  
Eugenii Emelin ◽  
Sergey Sakharov
Keyword(s):  
Radiation Intensity ◽  
Oscillation Frequency ◽  
Uv Light ◽  
Zno Nanorods ◽  
Oxygen Adsorption ◽  
Charge Carriers ◽  
Resonance Oscillation ◽  
Initial Value ◽  
Radiation Sensor ◽  
Uv Sensors

The possibility of creating resonant ultraviolet (UV) sensors based on the structure of ZnO nanorods/La3Ga5SiO14 microbalance (LCM) has been investigated. The principle of sensor operation is based on the desorption of oxygen from the surface of ZnO nanorods upon irradiation with UV light and an increase in the concentration of charge carriers that leads to an increase in the capacitance of the structure of ZnO nanorods/LCM. It has been shown that UV radiation intensity affects the resonance oscillation frequency of the LCM sensor. After the end of irradiation, the reverse process of oxygen adsorption on the surface of ZnO nanorods occurs, and the resonance frequency of the sensor oscillations returns to the initial value.

PPV derivative/ZnO nanorods heterojunction: Fabrication, Characterization and Near-UV light sensor development

2018 ◽  
Vol 106 ◽  
pp. 28-34 ◽  
Author(s):  
Dhouha Jemmeli ◽  
Marwa Belhaj ◽  
Balkis Ben Salem ◽  
Nejmeddine Jaballah ◽  
Roman Yatskiv ◽  
...  
Keyword(s):  
Uv Light ◽  
Zno Nanorods ◽  
Sensor Development ◽  
Light Sensor

ZnO Nanorods and Their Modification with Au Nanoparticles for UV-light Activated Gas Sensing

2021 ◽  
Author(s):  
Milena Tomic ◽  
Isabel Gracia ◽  
Eduard Figueras ◽  
Carles Cane ◽  
Stella Vallejos
Keyword(s):  
Au Nanoparticles ◽  
Gas Sensing ◽  
Uv Light ◽  
Zno Nanorods

scholarly journals Selective growth of ZnO nanorods on microgap electrodes and their applications in UV sensors

2014 ◽  
Vol 9 (1) ◽  
Author(s):  
Qazi Humayun ◽  
Muhammad Kashif ◽  
Uda Hashim ◽  
Ahsanulhaq Qurashi
Keyword(s):  
Zno Nanorods ◽  
Selective Growth ◽  
Uv Sensors

scholarly journals Enhanced Optical Switching Characteristics of Organic Phototransistor by Adopting Photo-Responsive Polymer in Hybrid Gate-Insulator Configuration

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 527 ◽  
Author(s):  
Hea-Lim Park ◽  
Min-Hoi Kim ◽  
Hyeok Kim
Keyword(s):  
Methyl Methacrylate ◽  
Interfacial Layer ◽  
Optical Switching ◽  
Uv Light ◽  
Charge Carriers ◽  
Gate Insulator ◽  
Poly Methyl Methacrylate ◽  
Responsive Polymer ◽  
Switching Characteristics ◽  
Organic Phototransistor

In this study, we developed polymer gate insulator-based organic phototransistors (p-OPTs) with improved optical switching properties by using a hybrid gate insulator configuration. The hybrid gate insulator of our p-OPT has a photoresponsive layer made of poly(4-vinylphenol) (PVP), which enhances the photoresponse, and an interfacial layer of poly(methyl methacrylate) for reliable optical switching of the device. Our hybrid gate insulator-equipped p-OPT exhibits well-defined optical switching characteristics because no specific type of charge is significantly trapped at an interfacial layer/organic semiconductor (OSC) interface. Moreover, our device is more photoresponsive than the conventional p-OPT (here, an OPT with a single-polymer poly(methyl methacrylate) (PMMA) gate insulator), because the characteristic ultraviolet (UV) absorption of the PVP polymer allows the photoresponsive layer and OSC to contribute to the generation of charge carriers when exposed to UV light.

scholarly journals Free carrier enhanced depletion in ZnO nanorods decorated with bimetallic AuPt nanoclusters

Nanoscale ◽  
2020 ◽  
Vol 12 (37) ◽  
pp. 19213-19222 ◽  
Author(s):  
R. Bahariqushchi ◽  
S. Cosentino ◽  
M. Scuderi ◽  
E. Dumons ◽  
L. P. Tran-Huu-Hue ◽  
...  
Keyword(s):  
Uv Light ◽  
Zno Nanorods ◽  
Light Sensitivity ◽  
Free Carrier

AuPt nanocluster decoration of ZnO nanorods augments dark resistance (500×) and UV light sensitivity (10×) much more than Au or Pt decoration.

scholarly journals Physical properties of neodymium tin oxide pyrochlore ceramics

2017 ◽  
Vol 35 (3) ◽  
pp. 534-538 ◽  
Author(s):  
Adli A. Saleh ◽  
A. F. Qasrawi ◽  
G. Yumuşak ◽  
A. Mergen
Keyword(s):  
Electrical Resistivity ◽  
Physical Properties ◽  
Tin Oxide ◽  
Energy Band ◽  
Uv Light ◽  
Lattice Parameter ◽  
X Ray Diffraction ◽  
X Ray ◽  
Light Spectra ◽  
Uv Sensors

AbstractIn this work, physical properties of neodymium tin oxide pyrochlore ceramics prepared by solid state reaction technique are investigated by means of X-ray diffraction, scanning electron microscopy, ultraviolet-visible light (UV-Vis) spectrophotometry and temperature dependent electrical resistivity measurements. The pyrochlore is observed to have a cubic FCC crystal lattice with lattice parameter of 10.578 Å. The planes of the cubic cell are best oriented in the [2 2 2] direction. From the X-ray, the UV-Vis spectrophotometry and the electrical resistivity data analysis, the grain size, strain, dislocation density, optical and thermal energy band gaps, localized energy band tail states and resistivity activation energies are determined and discussed. The pyrochlore is observed to have an optical energy band gap of ~3.40 eV. This value corresponds to 365 nm UV light spectra which nominates the neodymium tin oxide pyrochlore ceramics for the use as UV sensors.

scholarly journals The role of polysaccharides and diatom exudates in the redox cycling of Fe and the photoproduction of hydrogen peroxide in coastal seawaters

2009 ◽  
Vol 6 (4) ◽  
pp. 7789-7819 ◽  
Author(s):  
S. Steigenberger ◽  
P. J. Statham ◽  
C. Völker ◽  
U. Passow
Keyword(s):  
Hydrogen Peroxide ◽  
Coastal Waters ◽  
Phaeodactylum Tricornutum ◽  
Laboratory Experiments ◽  
Uv Light ◽  
H2o2 Production ◽  
Initial Value ◽  
Photochemical Formation ◽  
Algal Exudates

Abstract. The effect of artificial acidic polysaccharides (PS) and exudates of Phaeodactylum tricornutum on the half-life of Fe(II) in seawater was investigated in laboratory experiments. Strong photochemical hydrogen peroxide (H2O2) production of 5.2 to 10.9 nM (mg C)−1 h−1 was found in the presence of PS and diatom exudates. Furthermore when illuminated with UV light the presence of algal exudates had a net stabilising effect on ferrous iron in seawater (initial value 100 nmol L−1) above that expected from oxidation kinetics. In the dark the PS gum xanthan showed no stabilising effect on Fe(II). The photochemical formation of superoxide (O2−) in presence of diatom exudates and its reducing effect on Fe(III) appears to result in greater than expected concentrations of Fe(II). A model of the photochemical redox cycle of iron incorporating these processes supported the observed data well. Diatom exudates seem to play an important role for the photochemistry of iron in coastal waters.

Construction of ZnxCd1−xS/CeO2 composites for enhanced photocatalytic activity and stability by chemical precipitation method

2021 ◽  
pp. 2150334
Author(s):  
Yi-Feng Chai ◽  
Zhong-Hua Zhu ◽  
Ming-Wei Liu ◽  
Jing Zeng ◽  
Gui-Fang Huang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Uv Light ◽  
Chemical Precipitation ◽  
Charge Carriers ◽  
Light Irradiation ◽  
Precipitation Method ◽  
Uv Light Irradiation

Development photoinduced photocatalysts is a significant approach to improve photocatalytic activity and stability. Herein, we successfully prepared Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites by a facile method. It is found that the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 composites show significant enhancement in photocatalytic activity for methyl orange (MO) degradation under visible and UV light irradiation. The degradation efficiency reaches up to 3.7 times higher than that of pure CeO2 under visible light irradiation. Moreover, the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples have almost no loss of photocatalytic activity after five recycles, indicating good photocatalytic stability of the samples. The attractive photocatalytic activity of the Zn[Formula: see text]Cd[Formula: see text]S/CeO2 samples could be attributed to the robust charge carriers transfer and separation.

Sign in / Sign up

Export Citation Format

Share Document