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W Marine - One of the best experts on this subject based on the ideXlab platform.
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zno mesoporous silica nanocomposites prepared by the reverse micelle and the Colloidal Methods photoluminescent properties and quantum size effect
Chemical Physics Letters, 2007Co-Authors: Claire Bouvy, W Marine, Baolian SuAbstract:Abstract Quantum size effect was demonstrated in ZnO/mesoporous silica nanocomposites prepared by two different routes: the reverse micelle strategy and the Colloidal Method owing to a fine tuning of particles grown by the control of mesopore size. N 2 adsorption–desorption measurements, Atomic Absorption and Photoluminescent spectroscopy have evidenced the efficient loading and growth of ZnO nanoparticles in the channels of the mesoporous silica matrix. The present work illustrated that both Methods are quite efficient in the preparation of short wavelength (blue) laser nanocomposite.
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ZnO/mesoporous silica nanocomposites prepared by the reverse micelle and the Colloidal Methods : Photoluminescent properties and quantum size effect
Chemical Physics Letters, 2007Co-Authors: Claire Bouvy, W MarineAbstract:Abstract Quantum size effect was demonstrated in ZnO/mesoporous silica nanocomposites prepared by two different routes: the reverse micelle strategy and the Colloidal Method owing to a fine tuning of particles grown by the control of mesopore size. N 2 adsorption–desorption measurements, Atomic Absorption and Photoluminescent spectroscopy have evidenced the efficient loading and growth of ZnO nanoparticles in the channels of the mesoporous silica matrix. The present work illustrated that both Methods are quite efficient in the preparation of short wavelength (blue) laser nanocomposite.
Claire Bouvy - One of the best experts on this subject based on the ideXlab platform.
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zno mesoporous silica nanocomposites prepared by the reverse micelle and the Colloidal Methods photoluminescent properties and quantum size effect
Chemical Physics Letters, 2007Co-Authors: Claire Bouvy, W Marine, Baolian SuAbstract:Abstract Quantum size effect was demonstrated in ZnO/mesoporous silica nanocomposites prepared by two different routes: the reverse micelle strategy and the Colloidal Method owing to a fine tuning of particles grown by the control of mesopore size. N 2 adsorption–desorption measurements, Atomic Absorption and Photoluminescent spectroscopy have evidenced the efficient loading and growth of ZnO nanoparticles in the channels of the mesoporous silica matrix. The present work illustrated that both Methods are quite efficient in the preparation of short wavelength (blue) laser nanocomposite.
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ZnO/mesoporous silica nanocomposites prepared by the reverse micelle and the Colloidal Methods : Photoluminescent properties and quantum size effect
Chemical Physics Letters, 2007Co-Authors: Claire Bouvy, W MarineAbstract:Abstract Quantum size effect was demonstrated in ZnO/mesoporous silica nanocomposites prepared by two different routes: the reverse micelle strategy and the Colloidal Method owing to a fine tuning of particles grown by the control of mesopore size. N 2 adsorption–desorption measurements, Atomic Absorption and Photoluminescent spectroscopy have evidenced the efficient loading and growth of ZnO nanoparticles in the channels of the mesoporous silica matrix. The present work illustrated that both Methods are quite efficient in the preparation of short wavelength (blue) laser nanocomposite.
Baolian Su - One of the best experts on this subject based on the ideXlab platform.
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zno mesoporous silica nanocomposites prepared by the reverse micelle and the Colloidal Methods photoluminescent properties and quantum size effect
Chemical Physics Letters, 2007Co-Authors: Claire Bouvy, W Marine, Baolian SuAbstract:Abstract Quantum size effect was demonstrated in ZnO/mesoporous silica nanocomposites prepared by two different routes: the reverse micelle strategy and the Colloidal Method owing to a fine tuning of particles grown by the control of mesopore size. N 2 adsorption–desorption measurements, Atomic Absorption and Photoluminescent spectroscopy have evidenced the efficient loading and growth of ZnO nanoparticles in the channels of the mesoporous silica matrix. The present work illustrated that both Methods are quite efficient in the preparation of short wavelength (blue) laser nanocomposite.
Hang Yuan - One of the best experts on this subject based on the ideXlab platform.
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size shape and assembly controlled synthesis of cu2 xse nanocrystalsvia a non injection phosphine free Colloidal Method
CrystEngComm, 2012Co-Authors: Huaibin Shen, Hongzhe Wang, Hang YuanAbstract:In this paper, we report a facile, “green”, phosphine-free, low-cost, and non-injection Method to obtain size-, shape-, and assembly-controllable Cu2−xSe nanocrystals which can be used as uniform building blocks. Different sizes of monodispersed Cu2−xSe nanocrystals were synthesized successfully by simply controlling the reaction temperature. The highly uniform Cu2−xSe nanocrystals can be well controlled from 4 to 20 nm when the temperature was set from 120 to 200 °C. By changing the ratios of CuSt2, oleic acid (OA), oleylamine (OAM), and selenium-octadecene (Se-ODE) precursor, Cu2−xSe nanocrystals with different shapes (hexagonal, elongated hexagonal bipyramid-shaped, trigonal pyramidal-shaped) and assembly behaviors (hexagonal Cu2−xSe nanodiscs with 1D, 2D, and 3D columnar self-assembly, elongated hexagonal bipyramid-shaped Cu2−xSe with 2D and 3D self-assembly, trigonal pyramidal-shaped Cu2−xSe nanocrystals with different arrays) were obtained indeed. Even though both OA and OAM were used as stabilizers to synthesize different shaped Cu2−xSe nanocrystals, FTIR results indicated that the surface of the as-synthesized nanocrystals was only capped by OAM. XRD studies confirmed that three different shapes of Cu2−xSe nanocrystals prepared with this non-injection Method are all cubic berzelianite and well-crystallized. Current–voltage (I–V) behaviors of different shaped Cu2−xSe nanocrystals were measured and all found to have low resistivities.
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Size-, shape-, and assembly-controlled synthesis of Cu2−xSe nanocrystalsvia a non-injection phosphine-free Colloidal Method
CrystEngComm, 2012Co-Authors: Huaibin Shen, Hongzhe Wang, Hang YuanAbstract:In this paper, we report a facile, “green”, phosphine-free, low-cost, and non-injection Method to obtain size-, shape-, and assembly-controllable Cu2−xSe nanocrystals which can be used as uniform building blocks. Different sizes of monodispersed Cu2−xSe nanocrystals were synthesized successfully by simply controlling the reaction temperature. The highly uniform Cu2−xSe nanocrystals can be well controlled from 4 to 20 nm when the temperature was set from 120 to 200 °C. By changing the ratios of CuSt2, oleic acid (OA), oleylamine (OAM), and selenium-octadecene (Se-ODE) precursor, Cu2−xSe nanocrystals with different shapes (hexagonal, elongated hexagonal bipyramid-shaped, trigonal pyramidal-shaped) and assembly behaviors (hexagonal Cu2−xSe nanodiscs with 1D, 2D, and 3D columnar self-assembly, elongated hexagonal bipyramid-shaped Cu2−xSe with 2D and 3D self-assembly, trigonal pyramidal-shaped Cu2−xSe nanocrystals with different arrays) were obtained indeed. Even though both OA and OAM were used as stabilizers to synthesize different shaped Cu2−xSe nanocrystals, FTIR results indicated that the surface of the as-synthesized nanocrystals was only capped by OAM. XRD studies confirmed that three different shapes of Cu2−xSe nanocrystals prepared with this non-injection Method are all cubic berzelianite and well-crystallized. Current–voltage (I–V) behaviors of different shaped Cu2−xSe nanocrystals were measured and all found to have low resistivities.
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Large scale synthesis of stable tricolor Zn1 − xCdxSe core/multishell nanocrystalsvia a facile phosphine-free Colloidal Method
Dalton transactions (Cambridge England : 2003), 2011Co-Authors: Huaibin Shen, Hongzhe Wang, Changhua Zhou, Jin Zhong Niu, Hang YuanAbstract:Here we report a new “green” Method to synthesize Zn1 − xCdxSe (x = 0–1) and stable red–green–blue tricolor Zn1 − xCdxSe core/shell nanocrystals using only low cost, phosphine-free and environmentally friendly reagents. The first excitonic absorption peak and photoluminescence (PL) position of the Zn1 − xCdxSe nanocrystals (the value of x is in the range 0.005–0.2) can be fixed to any position in the range 456–540 nm. There is no red or blue shift in the entire reaction process. Three similar sizes of alloyed Zn1 − xCdxSe nanocrystals with blue, green, and yellow emissions were successfully selected as cores to synthesize high quality blue, green, and red core/shell nanocrystal emitters. For the synthesis of core/shell nanocrystals with a high quantum yield (QY) and stability, the selection of shell materials has been proven to be very important. Therefore, alternative protocols have been used to optimize thick shell growth. ZnSe/ZnSexS1 − x and CdS/Zn1 − xCdxS have been found as an excellent middle multishell to overcoat between the alloyed Zn1 − xCdxSe core and ZnS outshell. The QYs of the as-synthesized core/shell alloyed Zn1 − xCdxSe nanocrystals can reach 40–75%. The Cd content is reduced to less than 0.1% for Zn1 − xCdxSe core/shell nanocrystals with emissions in the range 456–540 nm. More than 15 g of high quality Zn1 − xCdxSe core/shell nanocrystals were prepared successfully in a large scale, one-pot reaction. Importantly, the emissions of such thick multishell nanocrystals are not susceptible to ligand loss and stability in various physiological conditions.
Chang-jie Mao - One of the best experts on this subject based on the ideXlab platform.
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CuAgSe nanocrystals: Colloidal synthesis, characterization and their thermoelectric performance
Journal of Materials Science, 2018Co-Authors: Yong Zuo, Qiong-ping He, Ji-ming Song, He-lin Niu, Yu Liu, Chang-jie MaoAbstract:CuAgSe is a promising thermoelectric (TE) material for its superior carrier mobility and ultralow lattice thermal conductivity. Herein, we present a scalable Colloidal Method to prepare monodisperse CuAgSe nanocrystals with high yield. The collected powder sample was washed by a sulfur-free reagent of NaNH2 to remove the surface organic ligands (CuAgSe-W) and then annealed (CuAgSe-W-A). Both kinds of ligand-free samples were then hot pressed into dense pellets to measure the TE property. The results revealed that the crystal structure of both samples changed from low-temperature β-phase to high-temperature α-phase at around 465 K. Sample CuAgSe-W shows interesting temperature-dependent transition from N-type to P-type, which could be potentially used as thermal control transistor. Sample CuAgSe-W-A does not display this transition state but it exhibits potential for intermediate temperature TE applications with a figure-of-merit zT reaching 0.68 at 566 K.