Structural characterization of chemically synthesized CdSe nanoparticles

被引：38

作者：

Kotkata, M. F. ^{[1
]}

Masoud, A. E. ^{[2
]}

Mohamed, M. B. ^{[3
]}

Mahmoud, E. A.

机构：

[1] Ain Shams Univ, Fac Sci, Dept Phys, Cairo 11566, Egypt

[2] Al Azhar Univ Girs, Dept Phys, Fac Sci, Cairo 11884, Egypt

[3] Cairo Univ, NILES, Cairo, Egypt

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2009年 / 41卷 / 04期

关键词：

CdSe; Nanoparticles; Synthesis; Confinement effect; Chalcogenides; Semiconductors; II-VI group; SEMICONDUCTOR SELENIUM; PHASE-PROPERTY; NANOCRYSTALS; PHOTOLUMINESCENCE; CLUSTERS; RAMAN;

D O I：

10.1016/j.physe.2008.10.019

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

CdSe nanoparticles were prepared at room-temperature via direct reaction between Cd(NO3)(2) and Na2Se in the presence of cetyltrimethyl ammonium bromide (CTAB) used as a capping material. The nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-Visible absorption spectrum, Fourier transform infrared (FT-IR) spectroscopy, Raman scattering, differential scanning calorimetry (DSC), differential thermal gravimetric (DTG) and heat stage X-ray diffraction (HS-XRD). Analysis of the obtained data reveals the precipitation of defective zinc blende CdSe nanoparticles of size about 11 nm in diameter. A blue shift in the optical gap, from 1.71 to 1.82 eV, has been observed for the absorption spectrum of the synthesized CdSe nanoparticles, as an indication of quantum confinement effect. The zinc blende phase is enhanced upon annealing above the melting of Se (220 degrees C) as is transformed into a better order and stable wurtzite structure upon further heating. More than one melting point has been recorded for the CdSe nanoparticles referring to different ranges of particle sizes (7:25 nm). A value of 810 degrees C characterizes the melting point of the predominant size (11 nm) of the CdSe nanoparticles. (C) 2008 Published by Elsevier B.V.

引用

页码：640 / 645

页数：6

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