CHINESE JOURNAL OF CATALYSIS
·
2023
·
IF 16.5
Wen Zhang,Cai-Cai Song,Jia-Wei Wang,Shu-Ting Cai,Meng-Yu Gao,You-Xiang Feng,Tong-Bu Lu
Existing artificial photosynthesis systems often underperform due to challenges in water oxidation and extensive photogenerated carrier transfer. Herein, we demonstrate that β- cyclodextrin-decorated CdS nanocrystals (CdS-CD) can simultaneously anchor cobalt tetraphenyl porphyrin (CoTPP) catalysts and alcohol reductants onto CdS surfaces through bidirectional host-guest interactions between β- CD and CoTPP/alcohol. This configuration ensures swift electron transfer from CdS to β -CD bonded CoTPP, facilitating CO 2 reduction to HCOOH. Results showcase a remarkable yield of 1610 μmol g −1 h −1 and a 96.5% selectivity. Meanwhile, photogenerated holes in CdS are efficiently neutralized by β -CD bonded furfuryl alcohol, achieving a furfural yield of 1567 μmol g −1 h −1 and > 99% selectivity. In contrast, the discrete CoTPP-CdS system achieved a HCOOH yield of only 306 μmol g −1 h −1 and a poor HCOOH selectivity of 46.4%. It was also observed that the CoTPP@CdS-CD system maintained high CO 2 -to-HCOOH conversion rates when using other alcohols as reductants.
研究领域:
化学
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材料科学
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环境科学
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DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2018
·Vol. 24
·期 59
·15930-15936
·
IF 5.16
Xue-Li Zhai,Jiang Liu,Ling-Yun Hu,Jian-Chun Bao,Ya-Qian Lan
Graphical Synergy in action . A novel polyoxometalate-decorated g-C 3 N 4 -wrapping snowflake-like CdS nanocrystal photocatalyst, by virtue of the synergistic effect stemming from the integration of the individual advantages of CdS, g-C 3 N 4 , polypyrrole, and the polyoxometalate Ni 4 (PW 9 ) 2 , displays high-performance hydrogen production activity and superior photocatalytic stability (see figure). Photocatalytic hydrogen evolution technology is recognized as a promising approach to relieving the growing energy crisis. Therefore, the development of a stable high-performance photocatalyst has long been the focus of research. In this work, quaternary composite materials involving a snowflake-like CdS nanocrystal wrapped by different amounts of polyoxometalate-decorated g-C 3 N 4 and polypyrrole (GPP@CdS) have been synthesized as photocatalysts for hydrogen production under visible-light irradiation. It has been revealed that the best composite (40 % GPP@CdS composite) exhibits hydrogen production activity of 1321 μmol, which exceeds that of CdS by a factor of more than two, and can be used in at least seven cycles with negligible loss of activity. The enhanced photocatalytic performance has been primarily attributed to the efficient synergy of CdS, g-C 3 N 4 , polypyrrole (PPy), and the polyoxometalate Ni 4 (PW 9 ) 2 . It should be noted that the introduction of PPy and g-C 3 N 4 into the title composite simultaneously promotes electron/hole pair separation and photocatalytic stability, whereas Ni 4 (PW 9 ) 2 serves as an efficient electron modulator and extra catalytic active site.
研究领域:
材料科学
·
能源化学
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Yaoyao Liu,Chunmei Zeng,Lunhong Ai,Jing Jiang
Cadmium sulfide (CdS) has been currently emerged as a promising class of photocatalyst candidates toward hydrogen evolution from water photosplitting because of its unique electronic structure and favorable optical property . However, pure CdS often suffers from the poor stability and fast charge carrier recombination. Cocatalyst engineering is an effective strategy to activate photocatalytic performance of CdS but remains a challenge. Herein, we develop an effective hydrothermal method to construct microwave-derived CdS nanocrystals hybridized with MoS 2 nanosheets . Such hybrids bear the nanocrystal-on-nanosheet heterostructures , ensuring the intimate interfacial contact and increased charge transfer kinetics. The resulting CdS/MoS 2 hybrids exhibit highly efficient photoreactivity and excellent photostability for hydrogen evolution under visible light irradiation. The hydrogen generation rate achieved by the optimal CdS/MoS 2 is approximately 286 times higher than that of pure CdS. This remarkably boosted performance could be ascribed to synergistically interfacial effect that brings an energy-beneficial driving force to realize the highly efficient transfer, migration, and separation of photoexcited charge carriers.
研究领域:
材料科学
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能源化学
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DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 35
·15970-15977
·
IF 7.76
Xixi Wang,Maochang Liu,Yubin Chen,Wenlong Fu,Bin Wang,Liejin Guo
The synthesis of semiconductor nanocrystals is usually limited to high-level symmetry, as constrained by the inherent, for example, face-centered cubic or hexagonal close-packed lattices of the crystals. Herein, we report a robust approach for breaking the symmetry of the CdS lattice and obtaining high-quality CdS ultrathin monopods, bipods, tripods, and tetrapods. The success relies on manipulating reaction kinetics by dropwise addition of a precursor solution, which permits deterministic control over the number of CdS monomers in the reaction solution. With rapid monomer supply by fast precursor injection, growth was restricted to only one {111} facet of the nascent CdS tetrahedron to produce an asymmetric ultrathin monopod (a zinc-blende tip with a wurtzite arm). Otherwise, growth monomers could access adjacent {111} facets through surface diffusion and thus lead to the switch of the growth pattern from asymmetric to symmetric to generate an ultrathin multipod (a zinc-blende tip/core with multi-wurtzite arms). These symmetry-controlled photocatalysts were characterized by a fine-tuned zinc blende–wurtzite intergrowth type-II homojunction. After evaluating their structure-dependent solar-hydrogen-production properties, the CdS ultrathin monopod with an appropriate length for controllable charge transportation showed the highest photocatalytic activity.
研究领域:
材料科学
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化学工程
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纳米技术
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DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
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2020
·
IF 3.442
Yuting Song,Wencheng Fang,Caixia Liu,Zhixia Sun,Fengyan Li,Lin Xu
Modification of semiconductor materials by polyoxometalates (POMs) is a promising strategy for increasing their photoelectrocatalytic (PEC) activity. In this work, we synthesized POM-modified CdS composite nanocrystals based on three kinds of Keggin-type mixed-addendum Mo/W POMs (Ag 3 PMo 3 W 9 O 40 , Ag 3 PMo 6 W 6 O 40 , and Ag 3 PMo 9 W 3 O 40 ). This is the first report on the semiconductor properties of the three Keggin-type mixed-addendum Mo/W POMs. Their PEC performances were studied by transient photocurrent responses, electrochemical impedance spectroscopy , and PEC oxidation of As(III) to As(V). The PEC performances of POM-modified CdS composite nanocrystals (CdS/Ag 3 PMo 3 W 9 O 40 , CdS/Ag 3 PMo 6 W 6 O 40 , and CdS/Ag 3 PMo 9 W 3 O 40 ) were superior to the performance of pure CdS nanocrystals. CdS/Ag 3 PMo 3 W 9 O 40 composite nanocrystals exhibited the highest efficiency for the PEC oxidation of As(III) to As(V), which was about 85% higher than that of the pure CdS nanocrystals. The present study provides insight into developing novel composite nanocrystals with Keggin-type mixed Mo/W POMs for efficient PEC oxidation.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2017
·Vol. 19
·期 7
·1-13
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IF 2.02
Qin Dezhi,Wang Li,Wang Yabo,Du Xian,Zhang Li,Zhang Qiuxia,He Bingyu
Protein-conjugated CdS nanocrystals (NCs) with different morphology have been synthesized under biomimetic condition using trypsin as capping agent in aqueous medium. The reaction parameters including concentration of trypsin, pH value, reaction time, and temperature have a major influence on the morphology and optical property of CdS NCs. XRD, selected area electron diffraction (SAED), TEM, HRTEM, and EDS characterizations were used to investigate the structure, composition, morphology, and size of as-prepared products. The binding reaction between Cd 2+ /CdS and trypsin was investigated systematically through various spectroscopic methods. UV-vis, FT-IR, photoluminescence (PL) spectra, and conductivity analysis of Cd 2+ -trypsin suggest that Cd 2+ ions could coordinate with the functional groups of trypsin and induce the formation of unfolding and loosening structure in protein molecules, and the change of protein conformation was also verified by circular dichroism (CD) spectra. This interaction increased local supersaturation of Cd 2+ ions around the groups of trypsin and reduced the nucleation activation energy of CdS nuclei, which favored heterogeneous nucleation in trypsin matrix and resulted in the formation of inorganic-organic hybrid materials. The functional integrity of the enzyme conjugated to CdS NCs was studied by monitoring the enzymatic activity of CdS-trypsin conjugates. The fluorescence of CdS NCs is dependent strongly on trypsin which passivates the surface of NCs.
研究领域:
生物化学
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材料科学
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光谱学
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DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 9
·期 20
·2101142
·
IF 9.926
Junjie Hao,Fenghuan Zhao,Qiushi Wang,Jiaying Lin,Peixian Chen,Junzi Li,Dongxiang Zhang,Meijuan Chen,Peizhao Liu,Marie-Helene Delville,Tingchao He,Jiaji Cheng,Yiwen Li
Ligand-induced chirality in colloidal semiconductor nanocrystals attracts attention because of their tunable chiroptical properties. Here, the induced chirality and circularly polarized luminescence (CPL) are investigated as a function of the CdS shell growth in a range of 2D CdSe/CdS nanoplatelets (NPLs) capped with chiral ligands. Five samples of CdSe/CdS NPLs are synthesized by a one-pot approach to vary the island-like shell on a four-monolayer (4 ML) CdSe NPLs core, which effectively reduces the interfacial strain energy. The successful preparation of L-/D-Cysteine-capped CdSe/CdS NPLs with both tunable circular dichroism (CD) and CPL behaviors and a maximum anisotropic luminance factor ( g lum ) of 5.29 × 10 −4 is described. The induced chiroptical response shows a direct relationship with the formation of island-like shell in the first and second stages and shows a clear signal evolution. In the third stage with a full coating shell, the CD and CPL signals are inversely proportional to the CdS shell thickness. The island-like shell gives birth to the CPL signal, while the formation of full coating shell decreases the induced chirality. Such chiral and emissive NPLs provide an ideal platform for the rational design of semiconductor nanocrystals with chiroptical properties in areas of biomedicine, polarizers, and new generation of display devices.
研究领域:
材料科学
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光学
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纳米技术
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
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2020
·
IF 5.977
Ying Qin,Yu Wu,Guojuan Chen,Lei Jiao,Liuyong Hu,Wenling Gu,Chengzhou Zhu
Generally, the photoactive materials are always tightly fixed on the photoelectrode of photoelectrochemical (PEC) sensors to produce excellent photocurrent response, while obvious and constant background currents will appear as well and then hamper the ultrasensitive sensing of target molecules. In this work, ultrasensitive detection of organophosphorus pesticides (OPs) is successfully fulfilled by using dissociable photoelectrode based on CdS nanocrystal-functionalized MnO 2 nanosheets . With the assistance of acetylcholinesterase (AChE), acetylthiocholine (ATCh) is hydrolyzed into thiocholine (TCh) which can effectively etch the ultrathin MnO 2 nanosheets, resulting in the dissociation of MnO 2 –CdS from the photoelectrode. Benefiting from the dissociation of photoactive materials, the background photocurrent induced by semiconductor itself dramatically decreases. OPs, as a specific inhibitor for AChE activity, can prevent the generation of TCh and the dissociation of MnO 2 nanosheets, building a relationship between OPs concentration and photocurrent. Under the optimized test conditions, the PEC sensor for the detection of paraoxon displays a wide linear range from 0.05 to 10 ng/mL with a detection limit of 0.017 ng/mL. Furthermore, the PEC sensor shows good sensitivity, stability, and promising application in practical samples.
研究领域:
分析化学
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环境科学
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生物传感技术
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DOI
PubMed
高影响因子
Nanoscale Research Letters
·
2011
·Vol. 6
·期 1
·1-6
·
IF 2.56
Zou Yu,Li Dongsheng,Yang Deren
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 Cd 2+ 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.
研究领域:
材料科学
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纳米技术
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产品关联
DOI
PubMed
高影响因子
Science China-Materials
·
2015
·Vol. 58
·期 9
·693-703
·
IF 0
Liu Jian,Zhao Yuheng,Liu Jialong,Wang Shouguo,Cheng Yan,Ji Muwei,Zhou Yuanmin,Xu Meng,Hao Weichang,Zhang Jiatao
Heterovalent doping represents an effective method to control the optical and electronic properties of semiconductor nanocrystals (NCs), such as the luminescence and electronic impurities (p-, n-type doping). Considering the phase structure diversity, coordination varieties of Cu atoms in Cu 2 S NCs, and complexity of Cu doping in II-VI NCs, monodisperse Cu 2 S NCs with pure hexagonal phase were synthesized firstly. Then through cation exchange reaction between Cd ions and well-defined Cu 2 S NCs, dominant Cu(I) doped CdS NCs were produced successfully. The substitutional Cu(I) dopants with controllable concentrations were confirmed by local atom-specific fine structure from X-ray absorption near edge structure (XANES), extended X-ray absorption fine structure (EXAFS) spectroscopy, elemental analysis characterizations from X-ray photoelectron spectroscopy (XPS) and the electron spin resonance (ESR) measurement. The dominant and strong Cu(I) dopant fluorescence was verified by their absorption and photoluminescence (PL) spectra, and PL lifetime. Finally, the band positions and the p-type conductivities of the as-prepared Cu 2 S and Cu(I) doped CdS NCs were identified by ultraviolet photoelectron spectroscopy (UPS) measurements. The high monodispersity of NCs enables their strong film-scale self-assembly and will hasten their subsequent applications in devices.
研究领域:
材料科学
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半导体物理
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产品关联
DOI
ACS Nano
·
2020
·
IF 14.588
Junjie Hao,Yiwen Li,Jun Miao,Rulin Liu,Jiagen Li,Haochen Liu,Qiushi Wang,Huan Liu,Marie-Hélène Delville,Tingchao He,Kai Wang,Xi Zhu,Jiaji Cheng
Ligand-induced chirality in asymmetric CdSe/CdS core–shell nanocrystals (NCs) has been extensively applied in chiral biosensors, regioselective syntheses and assemblies, circularly polarized luminescence (CPL), and chiroptic-based devices due to their excellent physiochemical properties, such as the tunable quantum confinement effects, surface functionality, and chemical stability. Herein, we present CdSe/CdS NCs with various morphologies such as nanoflowers, tadpoles, and dot/rods (DRs) with chirality induced by surface chiral ligands. The observed circular dichroism (CD) and CPL activities are closely associated with the geometrical characteristics of the nanostructures, such as the shell thickness and the aspect ratio of the CdSe/CdS NCs. Furthermore, in situ observations of the growth of tadpoles with a single tail indicate that the CD response is mainly attributed to the CdS shell, which has a maximum tail length of ∼45 nm (approximately λ/10 of the incident light wavelength). On the other hand, the CPL activity is only related to the CdSe core, and the activity benefits from a thin CdS shell with a relatively high photoluminescence quantum yield (QY). Further theoretical models demonstrated the aspect-ratio-dependent g-factor and QY variations in these asymmetric nanostructures. These findings provide insights into not only the asymmetric synthesis of CdSe/CdS NCs, but also the rational design of CdSe/CdS nanostructures with tunable CD and CPL activities.
研究领域:
材料科学
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光学
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 22
·5342
·
IF 4.2
Wei Wei,Xinyu Sun,Jun Sun,Cen Hao
Controlling the growth, structure, and shape of CdS nanocrystals is crucial for harnessing their unique physicochemical properties across diverse applications. This control can be achieved by introducing chemical additives into the synthesis reaction mixture. However, precise manipulation of nanocrystal synthesis necessitates a thorough understanding of the formation mechanisms under various chemical conditions, a task that remains challenging. In this study, we employed in situ liquid cell transmission electron microscopy (TEM) to investigate the growth mechanisms of CdS nanocrystals in a reaction solution of cadmium chloride and thiourea, with sodium citrate serving as a structure-directing agent. We observed that CdS nanocrystals evolve through two distinct growth modes: (1) in the absence of sodium citrate, spherical nanocrystals isotropically transform into CdS nanocubes, and (2) in the presence of sodium citrate, cuboid nanocrystals preferentially extend along the {011} direction and anisotropically into CdS triangular nanoplates. Theoretical analysis has confirmed that the adsorption energy of sodium citrate on different crystal facets significantly influences the morphology of the CdS nanocrystals. Our findings not only provide a method for synthesizing CdS nanocrystals based on electron beam induction but also elucidate the intricate nanoscale growth mechanisms, offering insights that could inform the future rational design of nanocrystals with tailored morphologies.
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
危险品化学品经营许可证（带存储）