Synthesis and Investigation of the Linear and Nonlinear Optical Properties of Alloyed CdSe0.3Te0.7Nanocrystals

2014 ◽  
Vol 13 (01) ◽  
pp. 1450007
Author(s):  
H. S. Bahari ◽  
Z. Dehghani ◽  
E. Saievar-Iranizad ◽  
M. Molaei ◽  
M. H. Majles Ara
Keyword(s):  
Nonlinear Optical ◽  
Hexagonal Phase ◽  
Nonlinear Refraction ◽  
Refraction Index ◽  
Tem Analysis ◽  
Nlo Properties ◽  
Band Emission ◽  
Transmission Electron ◽  
Thermochemical Method ◽  
Average Size

Alloyed CdSe 0.3 Te 0.7nanocrystals (NCs) were prepared by a thermochemical method using Thioglycolic acid (TGA) as a capping agent molecule. X-ray diffraction (XRD) and Transmission electron microscopy (TEM) analysis demonstrated hexagonal phase NCs with an average size of around 2.5 nm. Synthesized NCs indicated a narrow band emission with a peak located at 561 nm. Nonlinear optical (NLO) properties of the CdSe 0.3 Te 0.7NCs have been investigated by z-scan technique using Continuum Wave H e– Ne laser. The nonlinear absorption coefficient and nonlinear refraction index were obtained in the order of 10-2 and 10-8, respectively. The results revealed that these NCs exhibit strong NLO properties effects such as self-defocusing and two photons absorption.

scholarly journals ZnSe Quantum Dots through a Facile one Pot Synthesis Process

2015 ◽  
Vol 34 ◽  
pp. 73-78
Author(s):  
Irtiqa Syed ◽  
Santa Chawla
Keyword(s):  
Quantum Dots ◽  
Band Gap ◽  
Quantum Confinement Effect ◽  
Hexagonal Phase ◽  
Fluorescence Decay ◽  
Synthesis Process ◽  
One Pot ◽  
One Pot Synthesis ◽  
Transmission Electron ◽  
Average Size

A novel one pot synthesis approach in oleic acid medium was employed to obtain monophasic ZnSe quantum dots (QD) of average size 3.7nm. The QDs were well crystalline in hexagonal phase as revealed by x-ray diffraction and high resolution transmission electron microscopy (HRTEM) studies. The ZnSe QDs exhibit sharp emission peak in the blue (465nm) with 385picosecond fluorescence decay time. The theoretical band gap corresponding to 3.7nm ZnSe QDs matched well with the measured 3.11eV band gap of synthesized QDs which thus showed quantum confinement effect.

Enhancing the Nonlinear Optical Properties of Lithium Tetraborate Glass Using Rare Earth Elements and Silver Nanoparticles

NANO ◽  
2020 ◽  
Vol 15 (05) ◽  
pp. 2050064
Author(s):  
M. A. Vallejo ◽  
S. Romero-Servin ◽  
Moisés I. Casillas Alvarez ◽  
Janet A. Elias Angel ◽  
C. Gomez-Solis ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Emission Spectra ◽  
Refraction Index ◽  
Lithium Tetraborate ◽  
Transmission Electron ◽  
Scanning Transmission ◽  
The Matrix ◽  
Index Value

In recent years, nonlinear optics field is in constant growth, particularly on the characterization and study of optical properties of glass compounds. In this sense, the plasmonic effect caused by silver nanoparticles (SNP) on the nonlinear optical (NLO) properties of different materials was studied. Furthermore, we report the experimental absorption spectra, the emission spectra, Z-scan measurements in both closed and open apertures and scanning transmission electron microscopy (STEM) to show the morphology of the matrices and the nucleation of SNP. Moreover, some NLO parameters were calculated, such as the NL refraction index and NL coefficient absorption of lithium tetraborate (Li2B4O7) glass activated with rare earths (Dy3+ and Yb3+), as well as study of the effect of different concentrations of SNP. From the results obtained, it has been ascertained that the plasmon resonance caused by the presence of SNP enhances the NL refraction index value, as well as most of its linear optical properties in the matrix of Li2B4O7.

Investigation of the Photoluminescence and Nonlinear Optical Properties of Ce2O3–TiO2 Nanocomposites

2021 ◽  
Vol 21 (10) ◽  
pp. 5201-5206
Author(s):  
P. C. Karthika ◽  
K. Mani Rahulan ◽  
Manickam Sasidharan ◽  
G. Vinitha ◽  
R. Seema ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Continuous Wave ◽  
Sol Gel ◽  
Nonlinear Refraction ◽  
Saturable Absorption ◽  
Time Resolved ◽  
Nlo Properties ◽  
Visible Spectra ◽  
Sol Gel Process ◽  
Synthesized Materials

This paper reports the photoluminescence and nonlinear optical (NLO) properties of Ce2O3–TiO2 nanocomposites synthesized via sol–gel process with different concentrations of cerium. The physical characterization studies by means of XRD indicated for the successful incorporation of Ce into the lattice of TiO2, while the UV-visible spectra for an absorption edge shift of TiO2 to the higher wavelength side following the Ce addition, and FESEM analysis for the morphology and particles sizes of the synthesized materials. On testing of the photoluminescence properties recorded through time-resolved fluorescence (TCSPC) technique, a decrease in the intensity of TiO2 with that of increased Ce concentration was observed and is due to an escalation in the number of oxygen vacancies. Further, the observation NLO properties for Ce2O3–TiO2 was done by a Z-scan technique of 5ns continuous wave (cw) laser at 532 nm, where the involvement of active mechanisms in the nonlinear refraction and nonlinear absorption are due to the saturable absorption (SA) and nonlinear thermal effects.

scholarly journals Synthesis and Characterization of Cysteine-Capped CdSe Nanoparticles Using an Alternative of Selenium

2019 ◽  
Vol 31 (11) ◽  
pp. 2457-2460
Author(s):  
K.E. Mokubung ◽  
M.J. Moloto ◽  
K.P. Mubiayi ◽  
N. Moloto
Keyword(s):  
Cdse Nanoparticles ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
Visible Absorption ◽  
Prepared Nanoparticles ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Xrd Patterns ◽  
Average Size

Present work reports synthesis of L-cysteine capped CdSe nanoparticles at different temperatures via an aqueous medium, non-toxic and green colloidal route. Cadmium chloride (CdCl2·5H2O) and sodium selenite (Na2SeO3) were used as cadmium and selenium sources respectively. The prepared nanoparticles are characterized by UV-visible absorption and photoluminescence spectroscopy, Fourier transform infrared, X-ray diffraction and transmission electron microscopy. The XRD patterns confirm a cubic phase structure of the prepared nanoparticles at 55, 75 and 95 ºC, respectively. The TEM analysis, optical absorption and photoluminescence spectra shows epitaxial growth of CdSe nanoparticles as the temperature increases with average size diameter of 4.12 ± 0.32, 5.02 ± 0.234 and 5.53 ± 0.321 nm for 55, 75 and 95 ºC, respectively.

scholarly journals MAGNETIC AND THERMAL PROPERTIES OF NANOMATERIALS BASED ON HIGHLY BRANCHED FERROCENE-CONTAINING POLYMERS

2018 ◽  
Vol 13 (5) ◽  
pp. 49-57 ◽  
Author(s):  
R. A. Dvorikov ◽  
V. A. Vasnev ◽  
А. А. Korlukov ◽  
М. I. Buzin
Keyword(s):  
Ir Spectroscopy ◽  
Magnetic Particles ◽  
Heating Temperature ◽  
Treatment Temperature ◽  
Magnetic Nanomaterials ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Average Size ◽  
Principal Possibility

New magnetic nanomaterials with magnetization up to 32 Gs·cm3/g were synthesized from highly branched ferrocene-containing polymers by thermal structural transformations in a field of 2.5 kOe. The structure and properties of the prepared polymers were studied by IR spectroscopy, transmission electron microscopy (TEM) and thermogravimetric analyses. According to IR spectroscopy the content of 1,3,5-substituted benzene rings in the ferrocene-containing polymer increases at 500°C. X-ray diffraction study showed that iron in such a sample is present exclusively in the form of Fe3O4 magnetite. As the heating temperature increased to 600°C, the composition of the samples became more complex: along with magnetite they contain cementite Fe3C and wustite FeO.97O. The magnetization of the ferrocene-containing polymer depends on the synthesis and heat treatment temperature. For a sample synthesized at 140°C the formation of a magnetically ordered phase begins at 500°C, and at 800°C the magnetization reaches a maximum value of 32 Gs·cm3/g. The average size of magnetic particles according to TEM analysis was 8-26 nm. The principal possibility of controlling the size and composition of the nanoparticles, as well as their magnetization depending on the conditions of production and the temperature of polymer structuring is shown. The obtained results provide a good basis for the directed synthesis of magnetic ferrocene-containing polymers with preset characteristics.

Third-order nonlinear optical properties of P3HT studied by nanosecond Z-scan in orthodichlorobenzene

2018 ◽  
Vol 27 (01) ◽  
pp. 1850001
Author(s):  
Feng Wu ◽  
Shunlong Zhao ◽  
Siwen Zhang ◽  
Jiang Lv
Keyword(s):  
Optical Properties ◽  
Absorption Coefficient ◽  
Nonlinear Optical ◽  
Nonlinear Refraction ◽  
Optical Nonlinearity ◽  
Saturable Absorption ◽  
Reverse Saturable Absorption ◽  
Third Order ◽  
Input Intensity ◽  
Nlo Properties

The nonlinear optical (NLO) properties of P3HT in orthodichlorobenzene were investigated at 532[Formula: see text]nm by Z-scan technique in the nanosecond domain. The nonlinear refraction of P3HT solution is up to an order of 10[Formula: see text][Formula: see text]esu and changes the sign from positive to negative with an increase in the input intensity. The reverse saturable absorption of the P3HT solution was observed in the intensity range of the measurements and their nonlinear absorption coefficient reaches an order of 102[Formula: see text]cm/GW. The strong optical nonlinearity perhaps allows them to be widely applied in the photoelectric field.

scholarly journals X-ray diffraction study of the elastic properties of jagged spherical CdS nanocrystals

2020 ◽  
Vol 38 (2) ◽  
pp. 271-278
Author(s):  
Pijush Ch. Dey ◽  
Sumit Sarkar ◽  
Ratan Das
Keyword(s):  
Elastic Properties ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
X Ray ◽  
Cds Nanocrystals ◽  
Peak Broadening ◽  
Transmission Electron ◽  
Strain Stress ◽  
The Individual ◽  
Average Size

AbstractIn this work, jagged spherical CdS nanocrystals have been synthesized by chemical method to study their elastic properties. The synthesized CdS nanocrystal has been characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The transmission electron microscope images show that the average size of the nanocrystal is 100 nm approximately. X-ray diffraction (XRD) study confirms that the CdS nanocrystals are in cubic zinc blende structure. The size calculated from the XRD is consistent with the average size obtained from the TEM analysis. The XRD data have been analyzed to study the elastic properties of the jagged spherical CdS nanocrystals, such as intrinsic strain, stress and energy density, using WilliamsonHall plot method. Williamson-Hall method and size-strain plot (SSP) have been used to study the individual effect of crystalline size and lattice strain on the peak broadening of the jagged spherical CdS nanocrystals. Size-strain plot (SSP) and root mean square (RMS) strain further confirm the results obtained from W-H plots.

Hydrothermal Synthesis and UV Absorption Property of Firewood-Like CeO2 Nanostructures

2012 ◽  
Vol 557-559 ◽  
pp. 577-580
Author(s):  
Yun Ling Zou ◽  
Yan Li ◽  
Nan Zhang ◽  
Qing Jun Zhou
Keyword(s):  
Electron Microscopy ◽  
Uv Absorption ◽  
Absorption Property ◽  
X Ray Diffraction ◽  
Tem Analysis ◽  
Transmission Electron ◽  
Good Crystallinity ◽  
Fluorite Type ◽  
Average Size ◽  
First Time

In this paper, we reported that firewood-like CeO2nanostructures were synthesized via hydrothermal method in the present of cetyltrimethylammonium bromide (CTAB) for the first time. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM) were used to characterize the as-obtained sample. The UV absorption property of the product was investigated by UV-vis spectrophotometry. XRD result shows that the product was a cubic fluorite-type CeO2phase with good crystallinity. FE-SEM and TEM analysis indicate that the firewood-like CeO2nanostructures were composed of CeO2nanoparticles with the average size of about 6-10 nm. The CeO2shows excellent UV absorption for that the transmittance (T %) of the sample in the UV region almost equal to zero.

Structure and third-order nonlinear optical properties of the two-dimensional CoIIcoordination polymer [Co(1,2-BIB)(PA)]n{1,2-BIB is 1,2-bis[(1H-imidazol-1-yl)methyl]benzene and H2PA is phthalic acid}

2016 ◽  
Vol 72 (11) ◽  
pp. 890-894 ◽  
Author(s):  
Ping Liu ◽  
Qiuxia Liu ◽  
Ning Zhao ◽  
Caixia An ◽  
Zhaoxun Lian
Keyword(s):  
Nonlinear Optical ◽  
Nonlinear Refraction ◽  
Chain Structure ◽  
Two Dimensional ◽  
Third Order ◽  
Nlo Properties ◽  
The Third ◽  
Inorganic Species ◽  
Nlo Materials ◽  
Methyl Benzene

The design of nonlinear optical (NLO) materials with large NLO responses has been a challenge for materials scientists and chemists. Recently, organic polymers have received attention regarding their NLO properties and fast nonlinear response, and clusters involving delocalizeddπ–pπ systems and conjugateddπ–pπ systems are expected to be a new class of NLO materials. Metal–organic coordination polymers combine the advantages of the organic and inorganic species. Thus far, tuning the third-order NLO properties of these materials has been a significant challenge. A two-dimensional coordination polymer, namely poly[(μ-benzene-1,2-dicarboxylato-κ3O1,O1′:O3){μ-1,2-bis[(1H-imidazol-1-yl)methyl]benzene-κ2N3:N3′}cobalt(II)], [Co(C8H4O4)(C14H14N4)]n, was synthesized by hydrothermal methods. In the structure, the CoIIion is pentacoordinated by two N atoms from two different 1,2-bis[(1H-imidazol-1-yl)methyl]benzene (1,2-BIB) ligands and three O atoms from two symmetry-related benzene-1,2-dicarboxylate (isophthalate, PA) anions. The pentacoordinated CoIIions are linked by PA ligands to form a chain structure parallel to thecaxis. Adjacent chains are further connected by 1,2-BIB ligands to produce a two-dimensional layered structure. The compound exhibits strong third-order nonlinear absorption and nonlinear refraction effects as a thin film. The third-order susceptibility χ(3)is calculated to be 1.07 × 10−8esu, which is much larger than the values found for pure inorganic semiconductors and some polymers.

Surfactant-Assisted Hydrothermal Synthesis and Characterization of Nano-Sized 2H-MoS2

2011 ◽  
Vol 694 ◽  
pp. 113-117
Author(s):  
Jun Zhang ◽  
Xin Li ◽  
Yu Li Feng ◽  
Bo Xu ◽  
Yan Hui Guo
Keyword(s):  
Hexagonal Phase ◽  
Sodium Molybdate ◽  
X Ray Diffraction ◽  
Hydrothermal Temperature ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Average Size ◽  
Surfactant Assisted

Nano-sized molybdenum disulfide has been prepared by hydrothermal method via surfactant and ultrasonic assistance, using sodium molybdate and thiourea as reagents. The as-synthesized MoS2 samples were characterized by x-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscope (TEM); the effects of addition of CTAB on reaction process and resulted particles have been investigated in detail. It has been shown that the addition of CTAB can not only prevent the agglomeration of the particles, but regulate their morphologies and phase compositions. The resulting 2H-MoS2 with hexagonal phase and average size of 10-20nm can be directly obtained at low hydrothermal temperature needless of high-temperature sintering and inert gas protection.

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