JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 8
·1-11
·
IF 2.175
Zhang Qiang,Cao Yongqiang,Shen Jianxing,Yang Ping
Nearly monodisperse CdSe/CdS and CdSe/Cd
x
Zn 1− x
S core–shell quantum dots (QDs) were synthesized by the epitaxial growth of CdS or Cd
x
Zn 1– x
S shells on pre-synthesized CdSe cores through a facile organic route. The thickness effect of CdS and Cd
x
Zn 1− x
S shells on the properties of resulting core–shell QDs, such as the photoluminescence (PL) efficiency, PL full width at half-maximum (fwhm), and PL decay lifetime, were investigated. The PL efficiency is greatly enhanced from 9 % of CdSe cores to 64 % of CdSe/Cd
x
Zn 1− x
S core–shell QDs. The PL spectra are narrowed after coating (fwhm ~28–32 nm). The alloy Cd
x
Zn 1− x
S shell is especially effective to enhance the PL efficiency, and it leads to a smaller red-shift in PL spectra compared with that of the CdS shell. The water-soluble CdSe/Cd
x
Zn 1− x
S core–shell QDs were obtained by the encapsulation of amphiphilic poly(styrene-co-maleic anhydride) (PSMA)–ethanolamine (EA) polymers, which was initially dispersed in oil phase. It was found that the CdSe/Cd
x
Zn 1− x
S QDs in water still retained a high PL efficiency as well as a small value in fwhm after encapsulating the CdSe/Cd
x
Zn 1− x
S QDs with PSMA–EA polymers, expanding the applications of these core–shell QDs in aqueous environment.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2023
·Vol. 77
·期 7
·3703-3712
·
IF 2.2
Zhou Zhiqiang,Cen Jianfang,Wang Huixiao,Sun Yu,Yang Liyun
Due to the high importance of transferrin in targeting tumor, the investigation on the functionalization process of quantum dots (QDs) using transferrin is very essential. In this paper, the interaction between CdSe and CdSe@ZnS QDs with transferrin was studied by various spectroscopies. It was found that the two types of QDs triggered the fluorescence quenching of transferrin by the static quenching mechanism. At 298 K, the binding constant for CdSe@ZnS QDs (8.03 × 10 6 L·mol −1 ) is higher than CdSe QDs (2.84 × 10 6 L·mol −1 ), implying that CdSe@ZnS QDs could bind stronger to transferrin. In addition, the values of enthalpy change (∆ H ), entropy change (∆ S ) and Gibbs free energy change (∆ G ) were negative, indicating that the binding procedures between both QDs and transferrin were spontaneous and the main binding forces were hydrogen bonding and van der Waals force. The results of CD spectra indicated that both QDs induced the conformational change of transferrin, which further caused the release of iron ions from transferrin. Compared with CdSe QDs, less contents of iron ions in transferrin were detected after interaction with CdSe@ZnS QDs. Additional cytotoxicity tests showed that both QDs were toxic to Hela and 293T cells, but the cytotoxicity of CdSe QDs was stronger than that of CdSe@ZnS QDs. Moreover, the combination of transferrin failed to promote the cytotoxicity of CdSe QDs and CdSe@ZnS QDs, which is ascribed to the release of iron ions during the interaction process between QDs and transferrin.
研究领域:
生物化学
·
纳米医学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Xiao Shao,Yue Wu,Shuang Jiang,Bin Li,Tianyong Zhang,Yong Yan
Three-dimensional (3D) nanomaterials have been intensively investigated because of their unique properties and wide range of potential applications; however, the ligand-induced chirality in 3D semiconductor nanocrystals has been scarcely studied. In this paper, we report the synthesis of hydrophobic 3D CdSe nanotetrapods (Tps) with a high degree of uniformity in their morphology by using the hot-injection method. The core and arms of Tps are distinct in their crystal structure, thus creating an intracrystal heterojunction. The size of Tps, primarily the length of four arms, is controlled by changing the amount of didecyldimethylammonium bromide and reaction time. Next, enantiopure cysteine ligands were introduced to replace the hydrophobic native stabilizers to prepare chiral l- and d-cysteine-capped CdSe Tps. Importantly, the circular dichroism (CD) line shapes of l/d-cysteine-capped CdSe Tps are assigned to the different excitonic transitions of the core and arms, respectively. In addition, the observed CD activities are found to be sensitive to the size of the CdSe Tps, where the anisotropic g factors have increased and reached the maximum value at a moderate aspect ratio (AR) and a further increase of the AR leads to a decrease of the g factor. Because of charge transfer between the core and arms, we propose a plausible mechanism potentially responsible for the induced CD line shapes in terms of the excitonic states of Tps with two different crystal structures. We believe that chiral 3D nanomaterials with anisotropic morphologies could offer new opportunities for relevant applications.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACTA PHYSICO-CHIMICA SINICA
·
2013
·Vol. 29
·期 5
·1088-1096
·
IF 0.869
LIU Li,JIANG Wei,YANG Xi-Wen,CHEN Bin-Hua,WU Shi-Xi,LI Feng-Sheng
Novel Fe3O4-CdSe nanocomposites were prepared by depositing semiconductor on monodisperse magnetic nanoparticles. First, monodisperse Fe3O4 nanoparticles were fabricated by a solvothermal process in which iron acetylacetonate (Fe(acac)3)
was used as precursor, phenyl ether as reaction medium, oleic acid as surfactant and oleylamine (OAm) as both surfactant and reducing agent. Novel Fe3O4-CdSe heterostructures were prepared using 1-octadecene as high boiling solvent, cadmium oxide as Cd precursor, trioctyl
phosphate (TOP)-Se as Se precursor, n-hexadecylamine (HDA) as surfactant, and stearic acid (SA) as growth promoter and nucleating agent. The structure and properties of the Fe3O4-CdSe nanocomposite were fully characterized by transmission electron microscopy (TEM),
Fourier transform infrared (FTIR) spectrometry, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM), UV-Vis spectrum, and photoluminescence (PL). CdSe nanoparticles were successfully attached to the surface of Fe3O4 and
grew along the c-axis to form novel jujube pit-liked and nail-liked heterostructures with a width of 3.6 nm and length of 14.5 and 32.5 nm, respectively. The novel nanocomposites were a combination of magnetite Fe3O4 and hexagonal CdSe rods, and exhibited strong fluorescent
emission without obvious quenching and excellent superparamagnetic properties. Fluorescent absorption shifts to longer wavelength as the length of the CdSe rods increases. The saturation magnetization of Fe3O4 nanoparticles, jujube pit liked and nail liked Fe3O4-CdSe
nanocomposites were 57.80, 40.76, and 31.10 emu·g-1, respectively.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
Journal of the American Chemical Society
·
2016
·
IF 13.038
Jianhai Zhou,Chaodan Pu,Tianyu Jiao,Xiaoqi Hou,Xiaogang Peng
CdSe magic-size clusters with close-shell surface and fixed molecular formula are well-known in the size range between ∼1 and 3 nm. By applying high concentration of cadmium alkanoates as ligands, a conventional synthetic system for CdSe nanocrystals was tuned to discriminate completion from initiation of atomic flat facets. This resulted in ∼4–13 nm CdSe nanocrystals with hexahedral shape terminated with low-index facets, namely three (100), one (110), and two (111) facets. These low-symmetry (Cs group with single mirror plane) yet monodisperse hexahedra were found to be persistent not only in a broad size range but also under typical synthetic temperatures for growth of both CdSe and CdS. Atomic motion on the surface of the nanocrystals under enhanced ligand dynamics initiated intraparticle ripening without activating interparticle ripening, which converted the hexahedral nanocrystals to monodisperse spherical ones. This new synthetic strategy rendered optimal color purity of photoluminescence (PL) of the CdSe and CdSe/CdS core/shell nanocrystals, with the ensemble PL peak width comparable with that of a corresponding single dot.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
BULLETIN OF MATERIALS SCIENCE
·
2015
·Vol. 38
·期 5
·1443-1447
·
IF 1.017
YU MEIHUA,WANG YILIN
Permutite incorporating CdSe in mesopores has been prepared with a simple route. Firstly, mercaptosuccinic acid-capped CdSe quantum dots (QDs) were prepared in aqueous solution by using SeO 2 as selenium source and NaBH as reductant. Secondly, the commercial permutite was treated with acetic acid to induce a partial dealumnization, which can introduce a large number of intracrystal mesopores, and the CdSe QDs were successfully incorporated in the mesopores with the wet impregnation method. Photoluminescence spectra, X-ray diffraction and scanning electron microscopy were used for the characterization of samples. The spectra analyses results showed that the illuminant colour of QDs/permutite powder was similar to the corresponding QDs colloid. X-ray diffraction measurements indicated that the (1 0 1) diffraction peak at 2 ? = 27° for QDs/permutite powder was the same as the raw permutite, and the energy-dispersive X-ray spectra demonstrated that Cd and Se elements existed in the CdSe QDs/permutite powder.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 31
·25656-25661
·
IF 3.289
Zhixiang Jiang,Katarzyna Matras-Postolek,Ping Yang
Several kinds of hydrophobic quantum dots (QDs) including CdSe, CdTe, CdSe/CdxZn1−xS, and CdTe/CdSe/ZnSe were fabricated via organic synthesis to observe morphology variation during shell coating. CdSe QDs prepared at a relatively high temperature revealed a hexagonal structure and rod morphology. On being coated with a CdxZn1−xS shell, tetrahedron and rod morphologies were observed. It was found that the reaction temperature and injection rate play important roles. The photoluminescence properties of the core/shell QDs depended strongly on their preparation conditions such as temperature and ligands. For CdSe cores created at a relatively low temperature, CdxZn1−xS shell coating resulted in the formation of cubic CdSe/CdxZn1−xS core/shell QDs. This is ascribed to the role of a CdS interlayer. In contrast, multishell CdTe/CdSe/ZnSe QDs revealed a spherical morphology. Furthermore, the self-assembly of QDs with hexagonal structures occurs while regular assembled structures were not observed for QDs with a cubic morphology according to their transmission electron microscopy images. This is ascribed to a dipole force between QDs. This phenomenon is just related to the morphology and crystal structures rather than their composition.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2014
·Vol. 16
·期 8
·1-12
·
IF 2.278
Yang Ping,Chen Hsueh Shin,Zhang Qiang,Shi Ruixia,Wang Junpeng,Che Quande
To investigate the shell deposited kinetics, CdSe quantum dots (QDs) and nanorods (NRs) with a maximum length of 17 nm were fabricated via organic synthesis routes. CdSe with a hexagonal crystal structure (wurtzite) favors epitaxial growth on the {002} surfaces when well-controlled conditions were used. The morphologies and sizes of CdSe samples depended strongly on chemicals and temperature. In the case of 320 °C, CdSe NRs with adjusted length of 7–17 nm were obtained from trioctylphosphine oxide (TOPO) and tetradecylphosphonic acid (TDPA). In contrast, short CdSe NRs (less than 10 nm) were created from octadecylphosphonic acid (ODPA) and trioctylamine (TOA). Spherical CdSe QDs were further fabricated using stearic acid (SA) and TOPO at 300 °C. CdSe cores were coated with Cd 0.5 Zn 0.5 S and CdTe shells. Anisotropic growth occurred during shell deposition because CdS shells grown preferentially on the {001} facet of the CdSe core. In the case of CdSe core prepared from TOPO and TDPA, CdSe/Cd 0.5 Zn 0.5 S core/shell samples prepared from long CdSe NRs (more than 10 nm) revealed a peanut morphology while the core/shell samples created from short ones (less than 10 nm) exhibited a spherical morphology. All of the CdSe/Cd 0.5 Zn 0.5 S core/shell samples revealed a similar length to that of the CdSe cores. This phenomenon was also observed for the core/shell samples fabricated using CdSe NRs prepared by ODPA and TOA. This is ascribed to the well-developed crystal structure of CdSe NRs fabricated using an organic synthesis at high temperature. In contrast, this anisotropic growth did not occur when spherical CdSe QDs prepared from SA and TOPO and the shell (Cd 0.5 Zn 0.5 S) coating carried out using SA and TOA. To indicate the shell depositing process, CdSe NRs fabricated using TDPA and TOPO were coated with a CdTe shell. CdTe monomers were deposited on the middle and tip parts of the CdSe NRs to form a tetrapod-like morphology at 220 °C. This is ascribed to the large difference of structure of CdSe (hexagonal) and CdTe (zinc blende).
研究领域:
材料科学
·
纳米技术
·
化学合成
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Yue Han,Changdi Wang,Ruiyang Zhao,Jishu Han,Lei Wang
In order to alleviate environmental pollution and energy crisis caused by the excessive use of fossil fuels, photocatalytic water splitting to produce hydrogen as an alternative fuel has attracted widespread attention. The construction of heterojunction photocatalyst is considered to be one of the effective ways to enhance the photocatalytic hydrogen production efficiency. In this study, Ni-doped CdSe was modified on the surface of hollow ZnSnO 3 double-shell nanocubes. The obtained Cd 0.9 Ni 0.1 Se/ZnSnO 3 possessed high photocatalytic activity under visible light irradiation. The photocatalytic hydrogen production rate could reach to 6458.0 μmol/g/h. The successful construction of hollow Cd 0.9 Ni 0.1 Se/ZnSnO 3 double-shell type-I heterojunction increased visible light absorption, shortened the charge transport distance, and inhibited the recombination of electron-hole pairs, thus enhancing the photocatalytic hydrogen production performance of Cd 0.9 Ni 0.1 Se/ZnSnO 3 . It provided the idea for promoting the design of solar to chemical energy conversion and the effective guidance for constructing a high-efficient and stable photocatalyst.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·
IF 5.7
Tiancheng Hou,Longbin Chen,Yaodong Yang,Jialong Wang,Tianzi Yang,Wei-Feng Rao
The mechanical vibration-assisted piezoelectric catalytic water splitting for hydrogen production is a promising approach to address the energy crisis. However, most piezoelectric catalysts used for hydrogen production are limited by their high cost, low stability, and unsatisfactory hydrogen production rates. To overcome these problems, we employed a co-catalyst (CdSe) to enhance the catalytic performance of SrBi4Ti4O15. Notably, the composite catalyst achieved a hydrogen production rate of 21 mmol g−1 h−1, which is 10 times higher than that of pure SrBi4Ti4O15. This catalyst has the advantages of a high hydrogen production rate, good stability, and low cost, providing a more effective method for the design and synthesis of piezoelectric catalysts for water-based hydrogen production and laying a foundation for large-scale piezoelectric catalytic water splitting for hydrogen production in the future.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2016
·Vol. 27
·期 7
·6656-6664
·
IF 1.798
Lin Yibing,Lin Yu,Wu Jihuai,Zhang Xiaolong,Fang Biaopeng
In this study, after CdS quantum dots sensitized ZnO hierarchical spheres (ZnO HS), we used a simple process to deposit CdSe QDs on ZnO by spin-coating-based SILAR, and applied to photoanodes of quantum dots-sensitized solar cells. Before CdS and CdSe QDs deposition, the ZnO HS photoanodes were modified by Zn(CH 3 COO) 2 ·2H 2 O methanol solution to further enhance the open-circuit voltage and power conversion efficiency (PCE). The program of modifying photoanodes and the number of CdSe spin-SILAR cycles are evaluated on the optical and electrochemical properties of the cells. As a result, a high energy conversion efficiency of 2.49 % was obtained by using modified ZnO HS/CdS photoanode under AM 1.5 illumination of 100 mW cm −2 . And further decorated by the CdSe QDs, the ZnO HS/CdS/CdSe cell achieved a PCE of 5.36 % due to the modification of ZnO HS nanostructure, the enhanced absorption in the visible region, the lower recombination reaction and higher electron lifetime.
研究领域:
材料科学
·
纳米技术
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 3
·2305-2311
·
IF 1.556
Du Yingying,Yang Ping,Zhu Yuanna,Zhang Qiang
Monodispersed CdTe
x
Se1-x
and CdSe cores were synthesized via organic methods. The asprepared cores were coated with a Cd
y
Zn1-y
S shell by an epitaxial growth. Compared with the cores, an obvious red shift was observed
in both the absorption and photoluminescence (PL) spectra of core–shell quantum dots (QDs) and the PL efficiency was improved. The CdSe-based core–shell QDs were transferred from oil to water phase by the encapsulation of amphiphilic polymers. The ligands of QDs, namely hexadecylamine
(HDA) and oleic acid (OA), dramatically influenced the process of phase transfer. The process of phase transfer of HDA-coated CdTe
x
Se1-x
/Cd
y
Zn1-y
S core–shell QDs was failed, however, the OA-coated CdSe/Cd
y
Zn1-y
S
core–shell QDs can be successfully transferred from oil to water phase. This is ascribed that the surface ligand HDA falls from CdTe
x
Se1-x
/Cd
y
Zn1-y
S core–shell QDs during the process of phase transfer,
leading to non-interaction between QDs and amphiphilic polymers. The effect of molecular weight of the poly(styrene-co-maleic anhydride) (PSMA) on the phase transfer was also investigated. For the QDs with the same size, the PSMA with high molecular weight exhibit a shorter time in the process
of phase transfer compared with light molecular weight. Furthermore, the size of the QDs also affects the process of the phase transfer from oil to water phase. The smaller of the QDs, the shorter of the phase transfer time.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）