Fluorescence Characteristics of Highly-Pure Nanoparticles Embedded in Dye Complexes for Random Laser Design

2021 ◽  
Author(s):  
Atheer A. Mahmood ◽  
Oday A. Hammadi ◽  
Kais R. Ibraheem
Keyword(s):  
Titanium Dioxide Nanoparticles ◽  
Structural Characteristics ◽  
Pure Titanium ◽  
Random Laser ◽  
Laser Dyes ◽  
Organometallic Complex ◽  
Fluorescence Characteristics ◽  
Spectroscopic Characteristics ◽  
Complex Solutions ◽  
Random Gain

Abstract In this work, highly-pure titanium dioxide nanoparticles produced by dc magnetron sputtering technique were embedded in organometallic complex solutions such as Baq2 or Znq2 to form random gain media. The structural characteristics of the TiO2 nanoparticles were determined to confirm their high structural purity. The spectroscopic characteristics, mainly photoluminescence and fluorescence, of the complex solutions containing the nanoparticles were determined and studied. These media were compared to two of the most common laser dyes (Rhodamine b and Rhodamine 6G) to determine the feasibility to use them to produce random laser.

Investigations on the Nonlinear Optical Properties of Eu3+: TiO2 Nanoparticles via Z-Scan Technique

2021 ◽  
Vol 1039 ◽  
pp. 245-252
Author(s):  
Basma Abbas Jabbar ◽  
Khawla J. Tahir ◽  
Basheer M. Hussein ◽  
H.H. Obeed ◽  
Noor J. Ridha ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Titanium Dioxide Nanoparticles ◽  
Sol Gel ◽  
Pure Titanium ◽  
Nonlinear Optical Properties ◽  
Linear Absorption ◽  
Gel Technique ◽  
The Eu

Europium doped Titanium dioxide (TiO2) nanoparticles were prepared by Sol-Gel technique under varying condition to investigate the effects of Eu3 + doping on the optical properties of Titanium dioxide nanoparticles. The transmittance spectrum is clearly visible at wavelengths 394nm and 416nm, and is a result of electronic transitions of energy level of the Eu3 + ions. . The obtained composites for different doping concentration were analyzed by using Energy Dispersive X-ray Spectroscopy (EDS). The linear and nonlinear optical properties of the composite were studied using the Z-scan technique, and there was an increase in the nonlinear refractive index with an increase in the concentration of the Eu+3, where it reached its highest value, which is 3.01×10-10 at doping 2.3 while the linear absorption coefficient was an inverse proportion, where the highest value was at Pure titanium and it is 1.0296951×10-5 (cm/mw).

scholarly journals Label-Free Electrochemical Sensor Based on Manganese Doped Titanium Dioxide Nanoparticles for Myoglobin Detection: Biomarker for Acute Myocardial Infarction

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4252
Author(s):  
Adel Al Fatease ◽  
Mazharul Haque ◽  
Ahmad Umar ◽  
Shafeeque G. Ansari ◽  
Yahya Alhamhoom ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Tio2 Nanoparticles ◽  
Titanium Oxide ◽  
Titanium Dioxide Nanoparticles ◽  
Metal Oxide Nanoparticles ◽  
Pure Titanium ◽  
Label Free ◽  
Doped Tio2 ◽  
Vis Spectroscopy ◽  
Mn Doped

A label free electrochemical sensor based on pure titanium oxide and manganese (Mn)-doped titanium oxide (TiO2) nanoparticles are fabricated and characterized for the sensitive detection of myoglobin (Mb) levels to analyze the cardiovascular infarction. Pristine and Mn-doped TiO2 nanoparticles were synthesized via the sol-gel method and characterized in order to understand their structure, morphologies, composition and optical properties. The structural properties revealed that the pure- and doped-TiO2 nanoparticles possess different TiO2 planes. FTIR studies confirm the formation of metal oxide nanoparticles by exhibiting a well-defined peak in the range of 600–650 cm−1. The values of the optical band gap, estimated from UV-Vis spectroscopy, are decreased for the Mn-doped TiO2 nanoparticles. UV-Vis spectra in the presence of myoglobin (Mb) indicated interaction between the TiO2 nanoparticles and myoglobin. The SPE electrodes were then fabricated by printing powder film over the working electrode and tested for label-free electrochemical detection of myoglobin (Mb) in the concentration range of 0–15 nM Mb. The fabricated electrochemical sensor exhibited a high sensitivity of 100.40 μA-cm−2/nM with a lowest detection limit of 0.013 nM (0.22 ng/mL) and a response time of ≤10 ms for sample S3. An interference study with cyt-c and Human Serum Albumin (HSA) of the sensors show the selective response towards Mb in 1:1 mixture.

scholarly journals The Establishment of a Theoretical Model for the Estimation of Some Photo-Physical Processes in Laser Dyes

2020 ◽  
pp. 780-790
Author(s):  
Husam S. Al-Arab ◽  
Mahasin F. H. Al-Kadhemy ◽  
Asrar Abdulmunem Saeed
Keyword(s):  
Titanium Dioxide ◽  
Tio2 Nanoparticles ◽  
Absorption Spectra ◽  
Fluorescence Spectra ◽  
Titanium Dioxide Nanoparticles ◽  
Theoretical Method ◽  
Experimental Measurements ◽  
Laser Dyes ◽  
Absorption And Fluorescence Spectra ◽  
Fluorescein Dye

In this study, a new theoretical method for the estimation of absorption and fluorescence spectra is accomplished. These estimations were established following experimental measurements of absorption and fluorescence spectra for the solutions of fluorescein laser dye mixed with titanium dioxide (TiO2) nanoparticlesin distilled water. The used concentration of fluorescein dye was 1x10-5 M, whereas the masses of titanium dioxide nanoparticles were 0.0003g, 0.0005g, 0.001g and 0.002g. An absorption spectra improvement was observed upon raising the mass of TiO2 nanoparticles, which specifies that doping the fluorescein dye with TiO2 nanoparticles have an essential influence on the dye absorption spectra. On the other side, all fluorescence spectra for the dye quenched as TiO2 nanoparticles mass was increased, because of the induced electron transfer. The new method of theoretical estimations was based on curve fitting using Logistic Power Peak (LPP) function to estimate theoretical models for the absorption and fluorescence spectra of thesesamples. The results revealed that these estimated models had exceptional matching shapes with the experimental shapes, so that the estimated models can substitute the experimental measurements.

Structural Characteristics of Nanocomposites Fabricated With In-Situ Particle Synthesis Method

2010 ◽  
Author(s):  
Enis Tuncer ◽  
Isidor Sauers ◽  
D. Randy James ◽  
Georgios Polizos ◽  
Alvin R. Ellis ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Structural Characteristics ◽  
National Laboratory ◽  
Synthesis Method ◽  
Electrical Insulation ◽  
Particle Synthesis ◽  
Oak Ridge ◽  
Electrical Insulation Materials

In this article we discuss fabrication of nanocomposites using an in-situ particle synthesis method. The nanocomposites discussed were prepared with solution based chemistry using a particle precursor mixture, which produces the nanoparticles. The nanocomposites presented were synthesized with titanium dioxide nanoparticles. The efforts of Oak Ridge National Laboratory to deliver better electrical insulation materials using nanotechnology are presented.

Grain Refinement in Titanium-Erbium Alloys

1974 ◽  
Vol 32 ◽  
pp. 522-523
Author(s):  
B. B. Rath ◽  
J. E. O'Neal ◽  
R. J. Lederich
Keyword(s):  
Electron Microscopy ◽  
Size Distribution ◽  
Grain Refinement ◽  
Grain Growth ◽  
Volume Fraction ◽  
Pure Titanium ◽  
Systematic Investigation ◽  
Second Phase ◽  
Titanium Matrix ◽  
Average Size

Addition of small amounts of erbium has a profound effect on recrystallization and grain growth in titanium. Erbium, because of its negligible solubility in titanium, precipitates in the titanium matrix as a finely dispersed second phase. The presence of this phase, depending on its average size, distribution, and volume fraction in titanium, strongly inhibits the migration of grain boundaries during recrystallization and grain growth, and thus produces ultimate grains of sub-micrometer dimensions. A systematic investigation has been conducted to study the isothermal grain growth in electrolytically pure titanium and titanium-erbium alloys (Er concentration ranging from 0-0.3 at.%) over the temperature range of 450 to 850°C by electron microscopy.

A High Resolution Study of G.P. Zones in Aluminum - 4.2 at % Silver

1982 ◽  
Vol 40 ◽  
pp. 722-723 ◽  
Author(s):  
R. Gronsky
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Computer Simulations ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Resolution Study

The phenomenon of clustering in Al-Ag alloys has been extensively studied since the early work of Guinierl, wherein the pre-precipitation state was characterized as an assembly of spherical, ordered, silver-rich G.P. zones. Subsequent x-ray and TEM investigations yielded results in general agreement with this model. However, serious discrepancies were later revealed by the detailed x-ray diffraction - based computer simulations of Gragg and Cohen, i.e., the silver-rich clusters were instead octahedral in shape and fully disordered, atleast below 170°C. The object of the present investigation is to examine directly the structural characteristics of G.P. zones in Al-Ag by high resolution transmission electron microscopy.

SEM analysis of the change in the reaction rates with deposit structures in the copper-iron cementation system

1978 ◽  
Vol 36 (1) ◽  
pp. 456-457
Author(s):  
V. Annamalai ◽  
L.E. Murr
Keyword(s):  
Structural Characteristics ◽  
Secondary Electron Emission ◽  
Copper Deposit ◽  
Reaction Rates ◽  
Sem Analysis ◽  
Experimental Conditions ◽  
Major Drawback ◽  
Emission Mode ◽  
Scrap Iron ◽  
Image Position

Economical recovery of copper metal from leach liquors has been carried out by the simple process of cementing copper onto a suitable substrate metal, such as scrap-iron, since the 16th century. The process has, however, a major drawback of consuming more iron than stoichiometrically needed by the reaction.Therefore, many research groups started looking into the process more closely. Though it is accepted that the structural characteristics of the resultant copper deposit cause changes in reaction rates for various experimental conditions, not many systems have been systematically investigated. This paper examines the deposit structures and the kinetic data, and explains the correlations between them.A simple cementation cell along with rotating discs of pure iron (99.9%) were employed in this study to obtain the kinetic results The resultant copper deposits were studied in a Hitachi Perkin-Elmer HHS-2R scanning electron microscope operated at 25kV in the secondary electron emission mode.

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