Study of Time Effect to the Optical Properties of CdSe Nanocrystal

2013 ◽  
Vol 667 ◽  
pp. 48-52
Author(s):  
C.H. Rosmani ◽  
Saifollah Abdullah ◽  
Mohamad Rusop
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Cadmium Selenide ◽  
Time Effect ◽  
Cdse Nanocrystals ◽  
Capping Agent ◽  
Wet Chemical Synthesis ◽  
Wet Chemical ◽  
Paraffin Liquid ◽  
Scanning Electron

The synthesis of Cadmium Selenide (CdSe) by using wet chemical synthesis replace organometallic method. The oleic acid using as the capping agent for CdSe nanocrystals. Paraffin liquid using as solvent for Se and Cd precursor. In this paper, the optical properties at different time was investigated. For optical properties, photoluminescence spectroscopy (PL) was used and for surface morphology field emission scanning electron microscope (FESEM). This paper describe the effect of CdSe properties at different certain time.

Influence of Acidity in Wet-Chemical Synthesis on the Joint of Nano-Sized β-Tricalcium Phosphate Particles with Collagen Fibrils in Their Composites

2006 ◽  
Vol 309-311 ◽  
pp. 585-588
Author(s):  
Chao Zou ◽  
Wen Jian Weng ◽  
Xu Liang Deng ◽  
Kui Cheng ◽  
Xin Zhi Wang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Tricalcium Phosphate ◽  
Biomedical Applications ◽  
Particle Dispersion ◽  
Collagen Fibrils ◽  
X Ray ◽  
Wet Chemical Synthesis ◽  
Wet Chemical ◽  
Collagen Suspension ◽  
Scanning Electron

β-tricalcium phosphate (β-TCP)/collagen composites are in the limelight for their biomedical applications. It is believed that joint status of β-TCP particles with collagen fibrils plays key roles in both osteoconductivity and biodegradability of composites. In this work, the influence of acidity during synthesis on the joint status between nano-sized β-TCP particles and collagen fibrils is investigated. The composites are characterized by X-ray diffractometer and Field Emission Scanning Electron Microscope. The results show that the joint status of nano-sized β-TCP particles with collagen fibrils in the composites depends on the acidity in collagen suspensions. A desired joint status with obvious disassembled collagen fibril, good particle dispersion and strong boding between the particles and the fibrils could be obtained when acidity of the collagen suspension is pH 2.

Ce3+-doped LaF3 nanoparticles: Wet-chemical synthesis and photo-physical characteristics “optical properties of LaF3:Ce nanomaterials”

2014 ◽  
Vol 20 (1) ◽  
pp. 169-176 ◽  
Author(s):  
F. Tabatabaee ◽  
A. A. Sabbagh Alvani ◽  
H. Sameie ◽  
S. Moosakhani ◽  
R. Salimi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Synthesis ◽  
Physical Characteristics ◽  
Wet Chemical Synthesis ◽  
Wet Chemical

Wet Chemical Synthesis and Optical Properties of α-Fe2O3 Nanocrystals

2017 ◽  
Vol 17 (10) ◽  
pp. 7672-7676
Author(s):  
Bulgan Tsedenbal ◽  
M. S Anwar ◽  
Imad Hussain ◽  
Bon Heun Koo
Keyword(s):  
Optical Properties ◽  
Chemical Synthesis ◽  
Wet Chemical Synthesis ◽  
Wet Chemical

Structural and Optical Studies of Undoped Porous GaN Prepared by Pt-Assisted Electroless Etching

2016 ◽  
Vol 846 ◽  
pp. 358-365 ◽  
Author(s):  
Ainorkhilah Mahmood ◽  
Zainuriah Hassan ◽  
Naser Mahmoud Ahmed ◽  
Fong Kwong Yam ◽  
Lee Siang Chuah ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electron Microscope ◽  
Raman Spectra ◽  
Three Dimensional ◽  
Pore Morphology ◽  
Optical Studies ◽  
Ridge Structure ◽  
Electroless Etching ◽  
Uv Lamp ◽  
Scanning Electron

Porous GaN structures were formed from crystalline GaN on conducting AL2O3 substrate using Pt-assisted electroless etching in HF: CH3OH: H2O2 = 1:4:4 under illumination of 500 W UV lamp. Scanning electron microscope (SEM) photoluminescence (PL) and Raman spectra measurements evidenced important features of the pore morphology, nanostructures and optical properties. According to the SEM micrographs, the three-dimensional ridge structure appears with the formation of porous material between the ridges. The porous layer exhibited a substantial PL intensity enhancement with red-shifted band-edge PL peaks associated with the relaxation of compressive stress. The shift of E2(high) to the lower frequency in Raman spectra of the porous GaN films further confirms such a stress relaxation.

STRUCTURAL AND OPTICAL CHARACTERIZATION OF NANOCRYSTALLINE CuAlS2 CHALCOPYRITE SYNTHESIZED BY POLYOL METHOD IN AUTOCLAVE

2012 ◽  
Vol 26 (31) ◽  
pp. 1250179 ◽  
Author(s):  
Y. VAHIDSHAD ◽  
A. IRAJIZAD ◽  
R. GHASEMZADEH ◽  
S. M. MIRKAZEMI ◽  
A. MASOUD
Keyword(s):  
Electron Microscope ◽  
Polyethylene Glycol ◽  
Scanning Electron Microscope ◽  
Optical Characterization ◽  
Polyol Method ◽  
Capping Agent ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Chalcopyrite CuAlS 2 nanoparticles were synthesized with polyol method. The solvothermal with autoclave nanoparticles synthesized are investigated. The amount and temperature of reducer, the solvent of salts could be important parameters that were studied. The nanoparticles were synthesized with CuCl , AlCl 3 and thiourea ( SC ( NH 2)2) as precursors, diethylene glycol (( CH 2 CH 2 OH )2 O ) and polyethylene glycol 600 ( HO ( C 2 H 4 O )n H ) as solvent and capping agent respectively, and ammonia ( NH 4 OH ) as reducing agent. The parameters of synthesis were studied by X-Ray diffraction (XRD) for analysis of structure, scanning electron microscope (SEM) for morphology and by ultraviolet–visible (UV–VIS) spectrophotometer for analysis of light structure. The possible formation mechanism is also discussed.

BRANCHED METAL NANOPARTICLES: A REVIEW ON WET-CHEMICAL SYNTHESIS AND BIOMEDICAL APPLICATIONS

Nano LIFE ◽  
2012 ◽  
Vol 02 (01) ◽  
pp. 1230002 ◽  
Author(s):  
SI YUE LI ◽  
MIN WANG
Keyword(s):  
Optical Properties ◽  
Chemical Synthesis ◽  
Metal Nanoparticles ◽  
Drug Carriers ◽  
Localized Surface Plasmon ◽  
Synthesis Methods ◽  
Wet Chemical Synthesis ◽  
Surface Enhanced Raman ◽  
Wet Chemical ◽  
And Performance

Branched metal nanoparticles present a promising new class of materials, which have great potential as sensors, catalysts, drug carriers, and imaging agents, owing to their unique nanostructures, physicochemical properties, optical properties, and other characteristics. Many efforts have recently been devoted to the wet-chemical synthesis of branched metal nanoparticles. Seed-mediated growth and seedless growth are two main routes for producing branched metal nanoparticles. Most particle synthesis methods can be modified for different metal systems. In this review, various synthesis methods for the fabrication of branched monometallic, bimetallic, and multimetallic nanoparticles and also branched polymer core-metal nanoshell composite nanoparticles are summarized, catagorized, and discussed. The relevance and performance of such nanostructured materials with regard to their optical properties which arise from localized surface plasmon resonances are summarized, and their potential as excellent substrates for surface enhanced Raman scattering (SERS) is reviewed. Other applications of branched nanoparticles such as drug delivery vehicle, medical imaging agent, catalysis, and magnetism are briefly introduced.

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