scholarly journals Оптические свойства наночастиц CdSe/ZnS в пленках термообработанного поливинилхлорида

2019 ◽  
Vol 53 (4) ◽  
pp. 508
Author(s):  
С.И. Расмагин ◽  
И.К. Новиков
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Polymer Composites ◽  
Photoluminescence Intensity ◽  
Optical And Electrical Properties ◽  
Photoluminescence Spectra ◽  
Zns Nanoparticles ◽  
Short Term ◽  
Long Time

AbstractComposites based on polyvinylchloride with incorporated CdSe/ZnS nanoparticles are produced. The optical and electrical properties of the polymer composites containing CdSe/ZnS nanoparticles are studied. The absorption and photoluminescence spectra of the composites are recorded, and their bulk resistivities are measured. The CdSe nanoparticle dimensions are determined. It is established that, upon short-term heat treatment, the photoluminescence intensity increases, whereas upon heating for a long time, the photoluminescence intensity substantially decreases.

Nitrogen Effects on Optical and Electrical Properties of Amorphous Carbon

2010 ◽  
Vol 636-637 ◽  
pp. 423-429 ◽  
Author(s):  
M. Fathallah ◽  
N. Alassimi ◽  
N. Alzayed ◽  
R. Gharbi
Keyword(s):  
Electrical Properties ◽  
Amorphous Carbon ◽  
Carbon Nitride ◽  
Gas Mixture ◽  
Optical And Electrical Properties ◽  
Photoluminescence Spectra ◽  
Graphite Target ◽  
Triple Bonds ◽  
C And N ◽  
Amorphous Carbon Nitride

Optical and electrical properties amorphous carbon nitride (a-CN) has been investigated on films deposited by reactive R.F. sputtering source with a graphite target. The amorphous carbon nitride samples were prepared under a gas mixture of nitrogen (N2) and /or Argon (Ar).The optical transitions are governed by the  and * electronic state distributions, related to sp2- and sp1-hybridized C and N atoms. Specific lonepair electronic states arise from groups (CN) with sp1-hybridized C atoms, which may form C≡N triple bonds or —N=C=N— longer chains. Photoluminescence spectra show a maximum around 650 nm. Two conduction regimes at high and low temperature are found in a-CN samples. The corresponding activation energies decrease with the increase of target voltage.

Effect of heat treatments on the electronic properties of indium sulfide films

2020 ◽  
Vol 89 (2) ◽  
pp. 20301 ◽  
Author(s):  
Tamihiro Gotoh
Keyword(s):  
Heat Treatment ◽  
Electrical Resistivity ◽  
Electrical Properties ◽  
Heat Treatments ◽  
Indium Sulfide ◽  
Optical And Electrical Properties ◽  
Initial State ◽  
Sulfur Powder ◽  
Heat Treated ◽  
Ar Gas

The optical and electrical properties of indium sulfide films with different heat treatments are investigated. Indium sulfide films are heat treated in Ar gas in a temperature range of 100–400 °C. Some annealed samples are heat treated at 300 °C with sulfur powder. The indium sulfide films show a band gap of 1.9–2.3 eV, an electrical resistivity in the range of 5.5 × 100–6.0 × 103 Ωm, and n-type electrical conduction. The resistivity decreases by three orders of magnitude by heat treatment at 300 °C in Ar gas and recovers almost to the initial state by heat treatment at 300 °C with sulfur powder. The Seebeck coefficient and subgap absorption at 1 eV show similar changes and recovery. The experimental results reveal the possible control of the density of states and of the Fermi level position by heat treatment and, hence, the feasibility of carrier control.

Ultra-Fine ZnO Nanobelts and their Photoluminescence Emission

2005 ◽  
Vol 872 ◽  
Author(s):  
Aurangzeb Khan ◽  
Martin E Kordesch
Keyword(s):  
Electrical Properties ◽  
Thermal Evaporation ◽  
Ultra Violet ◽  
Blue Shift ◽  
Near Band Edge ◽  
Optical And Electrical Properties ◽  
Photoluminescence Spectra ◽  
Average Width ◽  
Violet Emission ◽  
Evaporation And Condensation

AbstractUltra-Fine ZnO nanobelts are grown via thermal evaporation and condensation method without the use of any catalyst on the substrates. These nanobelts have an average width of about 5.8 nm. Photoluminescence spectra reveal that there is a blue shift in the near band edge ultra violet emission from 381 nm to 367 nm equal to 124 meV. These ultra-fine nanobelts have been studied for size induced optical and electrical properties.

Effect of heat treatment in HF atmosphere on the optical and electrical properties of BaF2 ceramics

2009 ◽  
Vol 45 (10) ◽  
pp. 1188-1192 ◽  
Author(s):  
N. I. Sorokin ◽  
D. N. Karimov ◽  
O. N. Komar’kova ◽  
E. A. Krivandina ◽  
A. N. Smirnov ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Properties ◽  
Optical And Electrical Properties

A study of the effect of morphology on the optical and electrical properties of TiO2 nanotubes for gas sensing applications

2020 ◽  
Vol 90 (3) ◽  
pp. 30102 ◽  
Author(s):  
Alba Arenas-Hernandez ◽  
Carlos Zúñiga-Islas ◽  
Julio César Mendoza-Cervantes
Keyword(s):  
Electrical Properties ◽  
Gas Sensing ◽  
Visible Spectrum ◽  
Electrolyte Solutions ◽  
Band Gap Energy ◽  
Electrochemical Anodization ◽  
Photoluminescence Intensity ◽  
Optical And Electrical Properties ◽  
Resistance Change ◽  
Sensing Applications

In this paper, we report the results of the optical and electrical properties of TiO2 nanotubes with different morphologies for gas sensing applications. Four nanomaterials of TiO2 were prepared by electrochemical anodization using four different electrolyte solutions: 0.255 wt% NH4F with 1 wt%, 3 wt%, 6 wt% and 9 wt% of deionized water in ethylene glycol. Micrographs by scanning electron microscopy (SEM) showed different morphologies caused by the variation in the water content of the solutions. Consequently, as an effect of morphology, the photoluminescence intensity in the visible spectrum was modified. By a change of the crystalline phase of TiO2 nanotubes, the oxygen vacancies increased and affected to the optical and electrical properties of TiO2 films. These films were used for detecting gas at room temperature. Hence, we studied and analyzed the relationship of the morphology, elemental composition, phase composition, band gap energy and defect states as a function of the electrical resistance change of TiO2 nanotubes to understand and improve the sensor response.

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