Journal of Materials Chemistry C
·
2013
·Vol. 1
·期 14
·2540-2547
·
IF 0
Sheng Cao,Jinju Zheng,Jialong Zhao,Lin Wang,Fengmei Gao,Guodong Wei,Ruosheng Zeng,Linhai Tian,Weiyou Yang
We demonstrate a strategy for the growth of Mn2+ ion doped cadmium based II–VI semiconductor quantum dots (QDs) with a designed buffer layer of ZnS (MnS/ZnS/CdS or Mn:CdS QDs), which aims to meet the challenge of obtaining highly efficient and well-resolved Mn2+ ion emission. First, small, high quality MnS cores are obtained by using thiols to replace conventional alkyl amines as capping ligands. Then a buffer layer of ZnS with a tailored thickness is introduced to the QDs before the growth of CdS shells to reduce the size mismatch between the Mn2+ (dopant) and Cd2+ (host) ions. The fabricated MnS/ZnS/CdS core/shell QDs exhibit a high PL QY of up to 68%, which is the highest ever reported for any type of Mn2+ ion doped cadmium based II–VI semiconductor QD. The photoluminescence (PL) of the QDs consists of well-resolved Mn2+ ion emission without any detectable emission from the CdS band edge or surface defects. In addition, our MnS/ZnS/CdS QDs cannot only be made water-soluble, but can also be coated by ligands with short carbon chain lengths, nearly without cost to the PL QY, which could make them strong candidates for practical applications in biology/biomedicine and opto/electronic devices.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
半导体物理
·
光物理
·
生物成像
·
生物医学应用
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DOI
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Qiang Wu,Haifeng Zhao,Fei Huang,Juan Hou,Haibin Cao,Zhiyong Liu,Shanglong Peng,Guozhong Cao
The introduction of various amounts of reduced graphene oxide (RGO) to CdS/CdSe quantum dots co-sensitized solar cells was investigated to enhance the light absorption and to promote the electron transfer. The characterization and comparison of optical and electrochemical properties as well as the performance of the resultant quantum dot-sensitized solar cells (QDSCs) with different amounts of RGO have been investigated systematically. The introduction of RGO demonstrated to enhance the light harvesting and consequently increase the short-circuit current density (Jsc). ZnS inserting between QDs and RGO can effectively block the charge recombination at the interface; however, the defects of RGO in the TiO2/QDs/ZnS/RGO photoanode still may accelerate the interface charge recombination in QDSCs and lead to a slight decrease of the open-circuit voltage (Voc). The balance between the light harvesting and charge recombination in RGO modified QDSCs is a key for achieving high power conversion efficiency (PCE). Finally, the CdS/CdSe/ZnS co-sensitized cell with modification RGO (3 min) achieved a high PCE of 5.28% (Jsc = 15.8 mA/cm2, Voc = 572 mV), more than 13% higher than that of 4.69% (Jsc = 13.7 mA/cm2, Voc = 602 mV) obtained for the cell without RGO.
研究领域:
光伏技术
·
纳米材料
·
量子点太阳能电池
·
能源材料
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DOI
高影响因子
ACS Applied Energy Materials
·
2019
·
IF 0
Yuan Wang,Zhou Yang,Yunxia Huang,Yangxi Yan,Juan Hou,Zhimin Li,Guozhong Cao
Control of structural and compositional characteristics of photoanodes is a crucial step toward rapid transport of charges and high-efficiency loading of dye or quantum dots in the case of solar cell application. Hierarchical ZnO microspheres (ZMS) and TiO2 hybrid photoanode film were prepared for improved CdS/CdSe quantum dot sensitized solar cells (QDSCs). The addition of ZMS into TiO2 electrode films resulted in both increased short circuit current density (Jsc) and open circuit voltage (Voc). Such an improvement is ascribed to the increased light harvesting owing to scattering by ZMS and the reduced charge recombination due to the surface modification. TiO2/ZMS hybrid photoanode displays superior charge injection/transport performance due to the ZMS with unique hierarchical structure, providing charge transfer continuity and multiple electron transport channels for timely electron transport. As a result, the Jsc, Voc, and the photovoltaic conversion efficiency (PCE) were all remarkably enhanced with the insertion of hierarchical ZMS though varied appreciably with the amount of ZMS. Thus, the designed TiO2/ZMS heterostructure-based QDSCs with an optimizing ZMS ratio of 20 wt % achieved a PCE of 5.99%, which is about 35% increase of the efficiency for the devices without ZMS (4.45%).
研究领域:
材料科学
·
光伏技术
·
纳米技术
·
能源材料
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DOI
JOURNAL OF RARE EARTHS
·
2026
·
IF 7.2
Shaohong Guo,Ruyue Zheng,Huimin Yu,Jiaqi Yan,Jiayu Li,Haobo Wen,Ziyun Zhou,Jingchun Jia,Ying Chang,Meilin Jia,Changyan Zhu,Heng Jia,Jiang Wang,Zhongmin Su
Photocatalytic CO 2 reduction into value-added chemicals such as CO is of great importance for carbon-neutral in the future. However, both high CO 2 activation barriers and sluggish charge kinetics make it still a challenge for CO 2 photoreduction with high reactivity. Herein, a type-II heterojunction (CZ/C), which consists of CdS (C) nanospheres anchored on the defective Ce-doped ZnIn 2 S 4 (CZ) microflowers, was synthesized by an in-situ solvothermal route, realizing exceptional CO 2 catalytic performance under simulated sunlight irradiation. According to the detailed characterizations and density functional theory calculations, the energy barrier of the rate determining step is significantly reduced due to the outstanding CO 2 adsorption and activation on rare earth Ce atoms. Simultaneously, the separation and transfer efficiency of photogenerated carriers are greatly facilitated by type-II heterojunction constructed by anchoring CdS on CZ and S vacancies resulting from a heteroatom doping strategy. Thus, the optimum photocatalyst of CZ2/C2 composite provides an advantageous platform for CO 2 photoreduction to CO, which is roughly 7.5- and 3.0-fold higher than those of the pristine ZIS and CZ2, respectively. This work offers a promising avenue for designing effective catalysts with a dual-strategy method for photocatalysis.
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2019
·Vol. 7
·期 18
·1900330
·
IF 7.125
Yong Ge,Mengjiao Zhang,Lei Wang,Linghai Meng,Jialun Tang,Yu Chen,Lingxue Wang,Haizheng Zhong
Polarization can be used to distinguish artificial objects in complicated environments. The development of polarization-sensitive detection at ultraviolet (UV) wavelengths has been substantially delayed by the difficulties in fabricating anisotropic materials and optical elements for polarization modulation. Polarization-sensitive UV detection is developed by combining an electron-multiplying charge-coupled device (EMCCD) with a polarized luminescence downshifting material that benefits from an oriented-CdSe@CdS-dot-in-rods-embedded polyvinylidene fluoride (PVDF) composite film. With mechanical-stretching-induced orientation, the composite film shows emission polarization with an optimized ratio up to 0.52 ± 0.02. This integrated detection system can respond to linearly polarized 405 nm light with a signal difference up to 23%, showing its potential for use in UV polarization-enhanced imaging for object recognition.
研究领域:
光电子学
·
纳米材料
·
偏振成像
·
光电探测器
·
紫外传感
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Dongqing Li,Zhaohui Chen,En Zhao,Yanmei Zheng,Lin Dong,Wenjun Zhang,Zupeng Chen
Amino acids, as essential nitrogen-containing compounds, hold significant importance in pharmaceutical and advanced material applications. In this study, we develop a nickel nanoparticle-decorated cadmium sulfide (Ni/CdS) photocatalytic system for the efficient conversion of biomass-derived hydroxyl acids under mild conditions. The optimized catalyst exhibits exceptional performance in the reductive amination of lactic acid to alanine, achieving a reaction rate of 61.0 mmol·g cat −1 ·h −1 with 92.5 % selectivity, outperforming previously reported noble metal-based catalysts. Furthermore, comprehensive characterizations demonstrate that the unique ultrathin nanosheet morphology of the catalyst facilitates efficient charge carrier transport, while the incorporated nickel species act as an effective electron mediator, synergistically enhancing the photocatalytic activity. This work provides a sustainable and scalable approach for amino acid synthesis, highlighting the potential of non-precious metal photocatalysts for high-value transformation of biomass.
研究领域:
催化化学
·
可再生能源
·
绿色化学
·
材料科学
·
可持续化学
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产品关联
DOI
PubMed
高影响因子
CHEMPHYSCHEM
·
2025
·
IF 2.2
Kan Hu,Dingchen Wang
The construction of efficient Z-scheme heterojunctions is considered as a promising approach to improve the transfer and separation of photogenerated carries in the field of photocatalytic hydrogen evolution from water splitting. Herein, a novel CdS/UiO-66(Ce) with Z-scheme heterostructure is successfully fabricated from metal sulfide CdS and cerium-based UiO-66 metal–organic framework via a hydrothermal method. The Z-scheme CdS/UiO-66(Ce) heterojunctions can provide abundant active centers, broaden the response range to visible-light region, accelerate the transfer of interfacial charges, and suppress the recombination rate of photogenerated electron–hole pairs. As a result, CdS/UiO-66(Ce) (ω(CdS) = 30%) exhibits a hydrogen production rate of 1.975 mmol g −1 h −1 , which is 19.1 times higher than that of UiO-66(Ce). Overall, this article may provide a new pathway for the rational design of efficient Z-scheme heterojunctions with photocatalytic hydrogen evolution. Graphical The Z-scheme heterojunction is a pivotal design strategy in photocatalysis for balancing efficient charge separation and strong redox capability. In this article, a Z-scheme CdS/UiO-66(Ce) heterojunction is constructed by combining cerium-based metal–organic framework UiO-66(Ce) with CdS and achieved efficient photocatalytic water splitting for 1.975 mmol g −1 h −1 hydrogen evolution under visible light, which is 19.1 times higher than UiO-66(Ce).
研究领域:
材料科学
·
光催化
·
氢能
·
纳米材料
·
环境科学
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2013
·Vol. 43
·期 10
·3990-3998
·
IF 3.806
Junli Wang,Hui Feng,Kangmin Chen,Weiling Fan,Qing Yang
A facile catalytic growth route was developed for the low-temperature solution synthesis of Ag2S–CdS matchstick-like heteronanostructures in oleylamine, which are composed of a Ag2S spherical head and a CdS rod-like stem. Ag2S nanoseeds acted as an effective catalyst for the growth of CdS nanorods and remained at the tip of the resultant nanorods, leading to the formation of Ag2S–CdS heterostructures with a matchstick shape. The diameter of the Ag2S heads and the length of the CdS stems could be easily controlled by varying the molar ratios of the Ag/Cd precursors. The differential scanning calorimetry (DSC) and variable-temperature X-ray diffraction (XRD) studies confirmed that Ag2S catalytic seeds underwent a phase change, that is, they were in a high-temperature superionic conducting cubic structure during the CdS nanorod growth and then converted to a low-temperature monoclinic crystal structure as the reaction was cooled to room temperature. The influence of synthetic temperature on the product morphology was investigated and the morphological evolution at different growth stages was monitored using transmission electron microscopy (TEM). Furthermore, the growth kinetics of the Ag2S–CdS matchstick-like heteronanostructures, including the dissolution, nucleation and growth of CdS within the Ag2S catalyst, was reasonably discussed on the basis of the structural characteristics of the superionic cubic Ag2S catalyst and the low solubility of CdS in Ag2S derived from the Ag2S–CdS binary phase diagram.
研究领域:
材料化学
·
纳米科学与技术
·
无机化学
·
物理化学
·
半导体材料
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DOI
高影响因子
RSC Advances
·
2012
·Vol. 2
·期 27
·10330-10336
·
IF 0
Jungang Hou,Chao Yang,Zheng Wang,Shuqiang Jiao,Hongmin Zhu
Large-scale hydrogen production through water splitting using photocatalysts with solar energy can potentially produce clean fuel from renewable resources. In this work, photocatalytic hydrogen evolution with a high efficiency was achieved using CdS nanocrystal decorated CdLa2S4 microspheres (CdS/CdLa2S4) successfully prepared by a two-step hydrothermal process. The obtained CdS/CdLa2S4 composite was characterized by X-ray diffraction (XRD), electron microscopy (EM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance absorption spectroscopy (DRS), and photoluminescence spectroscopy (PL). XRD demonstrated that highly crystalline hexagonal CdS was obtained in CdS/CdLa2S4. EM results revealed that CdLa2S4 microspheres assembled from a large number of nanoprisms, were intimately enwrapped by the surrounding CdS nanocrystals with a particle size below 20 nm. This unique architecture resulted in the appropriate dispersion of CdS nanocrystals and intimate multipoint contacts between the CdS nanocrystals and CdLa2S4, which led to significant enhancement of charge separation in CdS/CdLa2S4. Especially, the CdLa2S4 microspheres decorated with 3 wt% CdS nanocrystals containing 0.4 wt% of Pt showed a high rate of H2-production at 2.25 mmol h−1 with an apparent quantum efficiency of 54% under 420 nm monochromatic light. The rate of hydrogen evolution from water splitting was 9 times faster in comparison with the rate observed on pure CdLa2S4, which is ascribed to the presence of CdS nanocrystals that alter the energy levels of the conduction and valence bands in the coupled semiconductor system.
研究领域:
材料科学
·
光催化
·
能源化学
·
纳米材料
·
半导体物理
·
可再生能源
·
催化化学
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DOI
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 2
·789-796
·
IF 10.733
Yangyang Zhan,Zhibin Shao,Tianhao Jiang,Jing Ye,Xiaofeng Wu,Bingchang Zhang,Ke Ding,Di Wu,Jiansheng Jie
Two-dimensional (2D) vertical heterojunctions possess peculiar electronic and optoelectronic properties according to their complementary composition, ultrathin thickness, and unique geometry. However, it is still a challenge to synthesize 2D vertical heterojunctions based on non-layered materials due to strong covalent bonds and abundant surface dangling bonds. Here we developed a partial cation exchange method for the synthesis of 2D vertical Cu2S/CdS heterojunctions. Large-size and single-crystalline CdS nanosheets prepared by a van der Waals epitaxy method served as host lattices for cation exchange reactions. The evolution of the nanosheets in terms of their morphology, composition and crystal structure was elaborately characterized. The as-prepared 2D vertical heterojunctions have two-layer ultra-thin structures and form large-area junctions at their interfaces. Under light irradiation, the photogenerated electron–hole pairs can be quickly separated under the electric field in the junction region, minimizing the possibility of charge recombination. As a result, the device based on 2D vertical Cu2S/CdS heterojunctions exhibits a higher photoelectric conversion capability compared with the device based on single-component 2D CdS or Cu2S Schottky junctions. Our work opens up opportunities to explore 2D vertical heterojunctions based on non-layered materials for high-performance optoelectronic devices.
研究领域:
材料科学
·
纳米科技
·
半导体物理
·
光电子学
·
能源材料
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DOI
高影响因子
PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2025
·
IF 2.5
Yao Zhang,Shiming Zhang,Li Luo,Sansan Hu,Xujuan Huang,Yongzheng Chen
Using visible light to drive NADH regeneration is an economically viable and environmentally sustainable technique. However, it necessitates a metal hydride (MH, [CpRh(bpy)(H 2 O)] 2+ ) as a synergist, and the high cost of the Rh noble metal significantly impedes the development and application of in-situ NADH regeneration. Therefore, in this study, single-atom Rh was immobilized onto the CdS QDs@SiO 2 combination via a consecutive ball-milling technique in combination with ionic layer adsorption and substitution. Subsequently, an enhanced photo-metal synergistic catalysis system for the recyclable regeneration of NADH was developed. In this composite, the single-atom Rh serves two main functions: It acts as an electrical medium and a metal catalyst, which regulates the activity and selectivity of the regenerated NADH. This study has successfully addressed the key scientific issues regarding the low electron transport rate and the recycling of the Rh noble metal during catalysis. Results confirm that single-atom Rh is successfully immobilized onto the CdS QDs@SiO 2 combination (Rh-CdS@SiO 2 ) and exhibits a faster electron transport and enhanced selectivity. Under blue light (LED, 420 nm) irradiation, the Rh-CdS@SiO 2 photo-metal catalyst shows a 25-fold increase in recyclable operability and achieves a 68% regeneration yield of NADH in just 4 min. Moreover, (S)-(+)-4-phenyl-2-butanol can be obtained with the regenerated NADH as the coenzyme of P450 enzyme catalysis.
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DOI
高影响因子
Catalysis Science & Technology
·
2023
·Vol. 13
·期 4
·1128-1139
·
IF 5
Peijing Guo,Shaoyu Yuan,Bingrong Guo,Siwei Li,Yongjun Gao
A CoO–CdS heterostructured photocatalyst CC-2-300 loaded with carbon derived from the biomass material chitosan was synthesized. Under visible-light irradiation, the photocatalytic hydrogen evolution rate can reach up to 10.60 mmol gcat−1 h−1, which is 7.21 times higher than that of pure CdS under the same conditions, with good cycle stability and high apparent quantum efficiency. The control experiments and characterization results prove that the chitosan-derived carbon supported CoO nanorods and CdS nanoparticles are cross-distributed to form a direct Z-scheme heterojunction, which improves the migration efficiency of photogenerated carriers and effectively slows down the recombination rate of photogenerated charges and holes on CdS that is susceptible to photocorrosion, thus improving the efficiency of photocatalytic hydrogen evolution.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）