Noninjection Synthesis of CdS and Alloyed CdSxSe1−x Nanocrystals Without Nucleation Initiators

Zou, Yu; Li, Dongsheng; Yang, Deren

doi:10.1007/s11671-010-9593-2

Cited by 22 publications

(23 citation statements)

References 21 publications

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“…The XRD patterns shown in Figure 2 indicate that the phase transformation from zinc blende to wurtzite occurred as the shape of the CdS nanocrystals varied from spherical to multi-armed. When no CTAC was used, the CdS nanocrystals with pure zinc-blende structure were synthesized, which has also been shown in the previous study [19]. With the increase of the amount of CTAC added, the characteristic diffraction peaks of (100), (101), (102), and (103) planes corresponding to the hexagonal wurtzite structure became more and more distinct, revealing the phase transformation from zinc-blende to wurtzite.…”

Section: Resultssupporting

confidence: 75%

Shape and phase control of CdS nanocrystals using cationic surfactant in noninjection synthesis

Zou

Yang

2011

Nanoscale Res Lett

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Monodispersed CdS nanocrystals with controllable shape and phase have been successfully synthesized in this study by adding cationic surfactant in noninjection synthesis system. With the increase of the amount of cetyltrimethylammonium chloride (CTAC) added, the shape of the CdS nanocrystals changed from spherical to multi-armed, and the phase changed from zinc-blende to wurtzite. It was found that halide ion Cl- plays a key role in the transformation, and other halide ions such as Br- can also induce similar transformation. We proposed that the strong binding between Cd2+ and halide ions reduced the reactivity of the precursors, decreased the nuclei formed in the nucleation stage, and led to the high concentration of precursor in the growth stage, resulting in the increase of size and phase transformation of CdS nanocrystals. In addition, it was found that the multi-armed CdS nanocrystals lost quantum confinement effect because of the increase of the size with the increase of the concentration of CTAC.

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Section: Resultssupporting

confidence: 75%

Shape and phase control of CdS nanocrystals using cationic surfactant in noninjection synthesis

Zou

Yang

2011

Nanoscale Res Lett

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“…On the other side the positions of the main excitonic peak determined from the absorption spectra in Figure 2 are 2.97 eV (curve 1) and 3.28 eV (curve 2) respectively. These values are higher than the energy gap E g of the bulk CdS (2.42 eV at 300 K [24][25][26]) which indicates on a blue shift of the absorption edge. The increase of the band gap is determined by the quantum size effect of these small crystallites, and the calculated diameter of the nanocrystals (2.8 nm and 4.4 nm) is comparative to the excitonic Bohr radius ~ 3 nm of CdS [21][22][23].…”

Section: Resultsmentioning

confidence: 72%

“…In this way we can evaluate the diameter of the nanoparticles as 2.8 nm and 4.4 nm. Such nanoparticles size implies a strong confi nement of the charge carriers, while the confi nement energies of the electron and hole are much larger than the energy of Coulomb interaction [22,24]. The position of the fi rst excitonic energy can be estimated from the relation, which connects the size of the nanocrystal and the excitonic energy E [21][22][23]:…”

Section: Resultsmentioning

confidence: 99%

Polymer Nanocomposite Based on Styrene with Butyl Methacrylate and Inorganic Semiconductor CdS

Iovu¹,

Enăchescu²,

Culeac³

et al. 2014

ChemJMold

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Abstract. We present experimental results on copolymer-based nanocomposite made of styrene with butyl methacrylate (1:1) and inorganic semiconductor CdS. Thin fi lm composite samples have been characterized by UVVis absorption and photoluminescent spectroscopy, as well as by transmission electron microscopy. Transmission electron microscope examination confi rms a relatively narrow distribution of CdS nanoclusters in the SBMA matrix, which covers the range 2-10 nm. On the other side, the average CdS particles size estimated from the position of fi rst excitonic peak in the UV-Vis absorption spectrum was found to be 2.8 nm and 4.4 nm for two samples with different duration of thermal treatment, which is in good agreement with PL experimental data. The PL spectrum for CdS nanocrystals is dominated by near-band-edge emission. The relatively narrow line width (40-45 nm) of the main PL band suggests the nanoparticles having narrow size distribution. On the other side, relatively low PL emission from surface trap states at longer wavelengths were observed in the region 500-750 nm indicating on recombination on defects.Keywords: nanocomposite, polymer matrix, photoluminescence, exciton. IntroductionNanocomposite (NC) materials belong to one of the most dynamic domain of research and development, and they occupy an important place is the fi eld of nanotechnology [1][2][3][4][5][6]. Nanocomposite materials made of a polymer matrix and an inorganic semiconductor have become a prominent area of research and technology because of their attractive properties [4][5][6]. NCs offer a variety of new possibilities beyond those of conventional materials as well as compared to NCs constituent components. The basic feature of nanoscale materials resides in the possibility of tuning of their physical and chemical properties through varying the size of incorporated nanoparticles. This actually means obtaining different properties within the same chemical composition just by changing the size of nanoparticles [7][8][9][10].Among existing variety of nanocomposite materials polymer based NCs attract a lot of research efforts because of many advantages, compared to conventional materials. These advantages refer to their relatively simple technology, low cost, easy tuning, etc. Polymer NCs can be obtained in the form of thin fi lms, bulk, or fi ber samples, etc., by relatively simple technological methods, among them drop-wise deposition, spin coating, extrusion, etc. Polymer based NC materials with inorganic semiconductors comprise a polymer material as a matrix and incorporated inorganic semiconductor nanoparticles as fi llers [11][12]. The role of the polymer matrix in nanocomposites is to assemble the nanoparticles into clusters, avoiding agglomeration, inducing ordering and orientation in self-assembling structures, etc.As one of the most important II-VI group semiconductors CdS nanoparticles have received great attention because of their attractive properties and potential for application in photonics and optoelectronics [14][15][16]...

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“…5. Miller-indexed peaks reveal CdS nanoparticles crystallized in a cubic structure (space group: F-43 m) [49,50], and no trace of Cd-and/or S-related secondary phases. The average lattice constant (a) and unit cell (V) calculated from the XRD peaks are about 5.835Å and 198.7Å 3 , respectively, which are in good agreement with those (a = 5.833Å and V = 198.5Å 3 ) of CdS [51].…”

Section: Resultsmentioning

confidence: 99%

Type-II CdS/ZnSe core/shell heterostructures: UV–vis absorption, photoluminescence and Raman scattering studies

Lien

Nghia

et al. 2015

Materials Science and Engineering: B

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Noninjection Synthesis of CdS and Alloyed CdSxSe1−x Nanocrystals Without Nucleation Initiators

Cited by 22 publications

References 21 publications

Shape and phase control of CdS nanocrystals using cationic surfactant in noninjection synthesis

Shape and phase control of CdS nanocrystals using cationic surfactant in noninjection synthesis

Polymer Nanocomposite Based on Styrene with Butyl Methacrylate and Inorganic Semiconductor CdS

Type-II CdS/ZnSe core/shell heterostructures: UV–vis absorption, photoluminescence and Raman scattering studies

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