Characterization of ZnSe Nanoparticles Prepared Using Ultrasonic Radiation Method

1998 ◽  
Vol 536 ◽  
Author(s):  
Jianfeng Xu ◽  
Wei Ji ◽  
Sing-Hai Tang ◽  
Wei Huang
Keyword(s):  
Xps Analysis ◽  
Phonon Modes ◽  
Znse Nanoparticles ◽  
Raman Scattering Spectroscopy ◽  
Ultrasonic Radiation ◽  
Radiation Method ◽  
Zinc Blende ◽  
Average Size ◽  
Zinc Blende Structure

AbstractZnSe nanoparticles with an average size of 15 nm were prepared using the ultrasonic radiation method. The characterization was carried out by means of XRD, TEM, XPS and Raman scattering spectroscopy. The experimental results indicate that the as-prepared powders are composed of ZnSe with zinc-blende structure. The high purity of ZnSe particles was confirmed by XPS analysis. In the Raman spectra, TO and LO phonon modes were observed at 205 and 257 cm−1 in the ZnSe nanoparticles.

Synthesis and Characterization of ZnS: Fe/ZnS Core-Shell Nanocrystals

2011 ◽  
Vol 148-149 ◽  
pp. 900-903
Author(s):  
Li Hua Li ◽  
Yong Jun Gu ◽  
Rui Shi Xie ◽  
Jian Guo Zhu
Keyword(s):  
Chemical Precipitation ◽  
Precipitation Method ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Pl Spectra ◽  
Zinc Blende ◽  
Diffraction Peaks ◽  
Zns Nanocrystals ◽  
Zinc Blende Structure

ZnS:Fe and ZnS:Fe/ZnS core-shell nanocrystals were synthesized by chemical precipitation method. It was found that the ZnS: Fe based nanocrystals possess zinc blende structure. Compared to ZnS: Fe nanocrystals, the intensity of the X-ray diffraction peaks of ZnS: Fe/ZnS nanocrystals reduced and these peaks moved to lower angles. TEM images show that ZnS: Fe based nanocrystals are spheroidal and the average particles size is about 3~4 nm. PL spectra of ZnS: Fe nanocrystals revealed several mission bands, ~406nm, ~444nm, ~416nm, However, PL spectra of ZnS: Fe/ZnS nanocrystals showed several mission bands, ~420nm, ~432nm, ~449nm.

Characterization of Electrolytically Deposited CdSe on Ti Substrates

2010 ◽  
Vol 297-301 ◽  
pp. 912-917 ◽  
Author(s):  
T.G. Argyropoulos ◽  
Jelica Novakovic ◽  
M.D. Athanassopoulou ◽  
P. Vassiliou ◽  
J.A. Mergos ◽  
...  
Keyword(s):  
Heat Treatment ◽  
High Temperature ◽  
Surface Morphology ◽  
Bath Temperature ◽  
Vacuum Heat Treatment ◽  
Bath Solution ◽  
Zinc Blende ◽  
Zinc Blende Structure

Electrolytical deposition of CdSe on Ti substrates from CdSO4 - SeO2 solutions is investigated. The effect of the bath temperature was investigated and how it affects the CdSe deposits. According to the XRD spectra, the obtained CdSe films exhibit the cubic zinc-blende structure that remains unaffected by vacuum heat treatment (650°C). The surface morphology of the films differs significantly with bath solution temperatures. When Au contacts are used, the Ti/CdSe/Au structure may exhibit rectifying properties depending on the temperature during the electrodeposition. High temperature baths make the deposits to obtain ohmic properties.

scholarly journals Investigation of Structural, Electrical and Vibrational Properties of Bi1.98A0.02Fe4O9 (A= Ba, Ce) Multiferroic Ceramics

2020 ◽  
Author(s):  
Poorva Sharma ◽  
Ashwini Kumar
Keyword(s):  
Ionic Conduction ◽  
Sol Gel ◽  
Low Frequency ◽  
X Ray Diffraction ◽  
Phonon Modes ◽  
Raman Scattering Spectroscopy ◽  
Practical Applications ◽  
Constant E ◽  
Size And Morphology

Abstract In this paper, we report the synthesis, phase formation and basic characterization of polycrystalline Bi2Fe4O9, Bi1.98Ba0.02Fe4O9, and Bi1.98Ce0.02Fe4O9 sample prepared through sol-gel route. Crystal structure of the as prepared samples have been characterized by X-ray diffraction and Raman scattering spectroscopy. All the obtained XRD peaks could be indexed to orthorhombic Pbam structure and revealed the formation of Bi2Fe4O9. Raman spectrum identifies Ag, B2g and B3g active optical phonon modes. The size and morphology of the nanoparticles have been analyzed using scanning electron microscopy (SEM). Dielectric constant (e') decreases with increase in frequency and it is constant at higher frequencies region and it can be explained on the basis of ionic conduction phenomenon in the low frequency region. The value of e' for all Bi2Fe4O9 based S1, S2, S3 and S4 samples are about 37, 75, 40 and 393, respectively at frequency 10 Hz. The observed properties signify that these materials are very useful in advanced technological and practical applications.

Synthesis and Characterization of Water-Soluble Cu2+-Doped ZnSe Quantum Dots

2009 ◽  
Vol 79-82 ◽  
pp. 2043-2046 ◽  
Author(s):  
Shan Shan Li ◽  
Fu Tian Liu ◽  
Qun Wang ◽  
Xiu Xiu Chen ◽  
Ping Yang
Keyword(s):  
Quantum Dots ◽  
Green Emission ◽  
Average Diameter ◽  
Water Soluble ◽  
X Ray ◽  
Zinc Blende ◽  
Transmission Electron ◽  
Uv Excitation ◽  
Zinc Blende Structure

Cu2+-doped ZnSe quantum dots (ZnSe:Cu) were prepared via a green and simple route, namely the chemical coprecipitation method. Under 365 nm UV excitation, green emission is observed. X-ray powder diffraction (XRD) shows that ZnSe:Cu nanoparticle is cubic zinc blende structure; the transmission electron microscopy (TEM) exhibits that the average diameter of ZnSe:Cu nanocrystals is less than 10 nm. UV-vis spectrophotometer and fluorescence spectrophotometer indicate that ZnSe:Cu nanocrystals have good fluorescence effects.

Structural and Optical Investigation of Mn-Doped ZnS Nanocrystals

2005 ◽  
Vol 475-479 ◽  
pp. 1795-1798 ◽  
Author(s):  
W.Q. Peng ◽  
S.C. Qu ◽  
G.W. Cong ◽  
Z.G. Wang
Keyword(s):  
Visible Spectrum ◽  
Optical Investigation ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Zinc Blende ◽  
Order Of Magnitude ◽  
Zns Nanocrystals ◽  
Average Size ◽  
Mn Doped ◽  
Zinc Blende Structure

Using a solution-based chemical method, we have prepared ZnS nanocrystals doped with high concentration of Mn2+. The X-ray diffraction analysis confirmed a zinc blende structure. The average size was about 3 nm. Photoluminescence spectrum showed room temperature emission in the visible spectrum, which consisted of the defect-related emission and the 4 T1-6 A1 emission of Mn2+ ions. Compared with the undoped sample, the luminescence of the ZnS:Mn sample is enhanced by more than an order of magnitude, which indicated that the Mn2+ ions can efficiently boost the luminescence of ZnS nanocrystals.

scholarly journals Investigation of Structural, Electrical, and Vibrational Properties of Bi1.98A0.02Fe4O9 (A = Ba, Ce) Multiferroic Ceramics

2021 ◽  
Vol 2021 ◽  
pp. 1-8
Author(s):  
Ashwini Kumar ◽  
Poorva Sharma ◽  
Nikhil Bhardwaj ◽  
Jingyou Tang ◽  
Guolong Tan
Keyword(s):  
Ionic Conduction ◽  
Sol Gel ◽  
Low Frequency ◽  
Frequency Region ◽  
X Ray Diffraction ◽  
Phonon Modes ◽  
Raman Scattering Spectroscopy ◽  
Practical Applications ◽  
Size And Morphology

In this paper, we report the synthesis, phase formation, and basic characterization of polycrystalline Bi2Fe4O9, Bi1.98Ba0.02Fe4O9, and Bi1.98Ce0.02Fe4O9 samples prepared by the sol-gel technique. The crystal structure of the prepared samples has been characterized by means of X-ray diffraction and Raman scattering spectroscopy. All the obtained XRD peaks can be indexed to the orthorhombic Pbam structure and reveal the formation of Bi2Fe4O9. The Raman spectrum identifies Ag, B2g, and B3g active optical phonon modes. The crystallite size and morphology of the nanoparticles have been analyzed using scanning electron microscope (SEM). Dielectric constant (ε′) decreases as the frequency increases, and it is constant at the higher frequency region which can be explained based on the ionic conduction phenomenon in the low frequency region. The ε′ values of Bi2Fe4O9(650–850), Bi2Fe4O9(800–850), Bi1.98Ba0.02Fe4O9, and Bi1.98Ce0.02Fe4O9 samples at 10 Hz frequency are about 37, 75, 90, and 393, respectively. The observed properties signify that these materials are very useful in advanced technological and practical applications.

scholarly journals Synthesis and Characterization of ZnSe/PVA nanocomposites for optical devices

2019 ◽  
Vol 8 (4) ◽  
pp. 44-49
Author(s):  
K. K. Kushwah ◽  
N. Gupta ◽  
K. Khare ◽  
S. Singh ◽  
F. Aziz ◽  
...  
Keyword(s):  
Band Gap ◽  
Blue Shift ◽  
Optical Devices ◽  
Energy Band Gap ◽  
Chemical Route ◽  
Znse Nanoparticles ◽  
In Situ Preparation ◽  
Average Size

This paper reports in situ preparation of ZnSe-PVA nanocomposite film using ecofriendly, safe, inexpensive, facile and non-organometallic synthetic chemical route, with PVA as the stabilizing agent. The XRD studies showed the formation of cubic ZnSe nanoparticles in PVA matrix with an average size of ~7 nm. Energy band gap determined by absorption edge of UV-VIS absorption spectra revealed increase in band gap with decrease in particle size. The optical properties like Refractive index and Photoluminescence (PL) of ZnSe /PVA with varying concentration of ZnSe content are also reported. The blue shift was found due to size reduction of ZnSe nanoparticles in PVA matrix.  

scholarly journals Microscopic Image Segmentation and Morphological Characterization of Novel Chitosan/Silica Nanoparticle/Nisin Films Using Antimicrobial Technique for Blueberry Preservation

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 303
Author(s):  
Rokayya Sami ◽  
Schahrazad Soltane ◽  
Mahmoud Helal
Keyword(s):  
Ph Value ◽  
Silica Nanoparticle ◽  
Morphological Characterization ◽  
Aerobic Bacteria ◽  
Nano Materials ◽  
Elongation At Break ◽  
Stable Suspension ◽  
Average Size ◽  
Material Ductility

In the current work, the characterization of novel chitosan/silica nanoparticle/nisin films with the addition of nisin as an antimicrobial technique for blueberry preservation during storage is investigated. Chitosan/Silica Nanoparticle/N (CH-SN-N) films presented a stable suspension as the surface loads (45.9 mV) and the distribution was considered broad (0.62). The result shows that the pH value was increased gradually with the addition of nisin to 4.12, while the turbidity was the highest at 0.39. The content of the insoluble matter and contact angle were the highest for the Chitosan/Silica Nanoparticle (CH-SN) film at 5.68%. The use of nano-materials in chitosan films decreased the material ductility, reduced the tensile strength and elongation-at-break of the membrane. The coated blueberries with Chitosan/Silica Nanoparticle/N films reported the lowest microbial contamination counts at 2.82 log CFU/g followed by Chitosan/Silica Nanoparticle at 3.73 and 3.58 log CFU/g for the aerobic bacteria, molds, and yeasts population, respectively. It was observed that (CH) film extracted 94 regions with an average size of 449.10, at the same time (CH-SN) film extracted 169 regions with an average size of 130.53. The (CH-SN-N) film presented the best result at 5.19%. It could be observed that the size of the total region of the fruit for the (CH) case was the smallest (1663 pixels), which implied that the fruit lost moisture content. As a conclusion, (CH-SN-N) film is recommended for blueberry preservation to prolong the shelf-life during storage.

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