RSC Advances
·
2015
·Vol. 5
·期 33
·25830-25839
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IF 3.84
Yiru Jia,Yun Yu,Xinjian Cheng,Xiao Zhao,Shengwei Ma,Honghui Huang
A facile method for the preparation of flexible semiconductor/polymer composite films with a CdS and ZnS particle layer on their surface has been developed. The as-prepared composite films were used as building blocks to fabricate a photo-catalytic cell. Methyl methacrylate (MMA) and butyl methacrylate (BMA) were copolymerized via free radical polymerization. BMA was used to tune the flexibility of the films. Allyl methyl sulfide (AMS) and N-allylmethylamine (AMA) were used as functional monomers to coordinate with Cd2+/Zn2+ ions. Cd2+/Zn2+ ions were chemically bonded to the PMMA-BMA-AMS (PMBS) or PMMA-BMA-AMA (PMBA) films. By addition of a thioacetamide (TAA) solution, S2− ions were gradually released and combined with Cd2+/Zn2+ ions to form CdS/ZnS particles. Accordingly, CdS/PMBA, ZnS/PMBA, CdS/PMBS and ZnS/PMBS films were prepared. The composite films were characterized and used to fabricate a photo-catalytic cell. The well-designed cell showed excellent performance in the degradation of the pollutant methyl blue (MB). Also, this cell could be used repeatedly just by rinsing with water after use.
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
Materials
·
2023
·Vol. 16
·期 21
·7007
·
IF 3.4
Yuzhe Wang,Yueqi Zhong,Jiangzhi Zi,Zichao Lian
Conventional single-component quantum dots (QDs) suffer from low recombination rates of photogenerated electrons and holes, which hinders their ability to meet the requirements for LED and laser applications. Therefore, it is urgent to design multicomponent heterojunction nanocrystals with these properties. Herein, we used CdSe quantum dot nanocrystals as a typical model, which were synthesized by means of a colloidal chemistry method at high temperatures. Then, CdS with a wide band gap was used to encapsulate the CdSe QDs, forming a CdSe@CdS core@shell heterojunction. Finally, the CdSe@CdS core@shell was modified through the growth of the ZnS shell to obtain CdSe@CdS@ZnS heterojunction nanocrystal hybrids. The morphologies, phases, structures and performance characteristics of CdSe@CdS@ZnS were evaluated using various analytical techniques, including transmission electron microscopy, X-ray diffraction, UV-vis absorption spectroscopy, fluorescence spectroscopy and time-resolved transient photoluminescence spectroscopy. The results show that the energy band structure is transformed from type II to type I after the ZnS growth. The photoluminescence lifetime increases from 41.4 ns to 88.8 ns and the photoluminescence quantum efficiency reaches 17.05% compared with that of pristine CdSe QDs. This paper provides a fundamental study and a new route for studying light-emitting devices and biological imaging based on multicomponent QDs.
研究领域:
材料科学
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光学
·
纳米技术
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DOI
PubMed
高影响因子
Scientific Reports
·
2016
·Vol. 6
·期 1
·1-10
·
IF 5.228
Zhang Jian,Zhang Qiaoxia,Wang Lianhui,Li Xing’ao,Huang Wei
A model of interface induction for interlayer growing is proposed for bandgap engineering insights into photocatalysis. In the interface of CdS/ZnS core/shell nanorods, a lamellar solid solution intermediate with uniform thickness and high crystallinity was formed under interface induction process. Merged the novel charge carrier transfer layer, the photocurrent of the core/shell/shell nanorod (css-NR) array was significantly improved to 14.0 mA cm −2 at 0.0 V vs. SCE, nearly 8 times higher than that of the perfect CdS counterpart and incident photon to electron conversion efficiency (IPCE) values above 50% under AM 1.5G irradiation. In addition, this array photoelectrode showed excellent photocatalytic stability over 6000 s. These results suggest that the CdS/Zn 1−x Cd x S/ZnS css-NR array photoelectrode provides a scalable charge carrier transfer channel, as well as durability and therefore is promising to be a large-area nanostructured CdS-based photoanodes in photoelectrochemical (PEC) water splitting system.
研究领域:
材料科学
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光催化
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·
IF 2.7
Nannan Li,Kai An,Haojie Liu,Xu Guo,Lijun Yang,Xiaoze Du
Metal sulfides with suitable morphology typically possess efficient solar light utilization and suitable band structures for photocatalytic hydrogen production. However, a significant challenge is faced in developing the optimal morphology of individual semiconductors and precisely modulating hybrid heterostructures. Herein, this work reports the superior photocatalytic hydrogen evolution performance of hexagonal CdS pyramids compared to other nanostructured CdS catalysts. Additionally, ZnS nanoparticles with zinc vacancies are grown in situ on the surface of the hexagonal CdS pyramids, meticulously constructing a Z-scheme heterojunction of CdS/ZnS. By elaborately adjusting the ratio of Cd to Zn sources, the interfacial structure of the heterojunction can be optimized to significantly reduce the obstruction of charge transfer. With the same concentrations of Cd and Zn sources, the CdS/ZnS heterojunction hexagonal pyramid–nanoparticle morphology exhibits a significantly enhanced photocatalytic hydrogen evolution rate of 4660 μmol h−1 g−1 under visible light, which is 4.6 and 84.72 times higher than those of pristine CdS pyramids and ZnS nanoparticles, respectively. The electron paramagnetic resonance (EPR) results comprehensively demonstrate the promoted interfacial charge separation in the Z-scheme CdS/ZnS. This work provides an effective strategy for the rational design of catalyst morphology and construction of Z-scheme heterojunction photocatalysts for efficient photocatalysis.
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
ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Njemuwa Nwaji,Eser Metin Akinoglu,Biyun Lin,Xin Wang,Michael Giersig
Chains of alternating semiconductor nanocrystals are complex nanostructures that can offer control over photogenerated charge carriers dynamics and quantized electronic states. We develop a simple one-pot colloidal synthesis of complex Cu1.94S-CdS and Cu1.94S-ZnS nanochains exploiting an equilibrium driving ion exchange mechanism. The chain length of the heterostructures can be tuned using a concentration dependent cation exchange mechanism controlled by the precursor concentrations, which enables the synthesis of monodisperse and uniform Cu1.94S-CdS-Cu1.94S nanochains featuring three epitaxial junctions. These seamless junctions enable efficient separation of photogenerated charge carriers, which can be harvested for photocatalytic applications. We demonstrate the superior photocatalytic activity of these noble metal free materials through solar hydrogen generation at a hydrogen evolution rate of 22.01 mmol g–1 h–1, which is 1.5-fold that of Pt/CdS heterostructure photocatalyst particles.
研究领域:
材料科学
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纳米技术
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光催化
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 19
·10346
·
IF 4.9
Jiadong Hu,Jiaxin Li,Qunqun Guo,Guicai Du,Changming Li,Ronggui Li,Rong Zhou,Hongwei He
Dopamine (DA) is a widely present, calcium cholinergic neurotransmitter in the body, playing important roles in the central nervous system and cardiovascular system. Developing fast and sensitive DA detection methods is of great significance. Fluorescence-based methods have attracted much attention due to their advantages of easy operation, a fast response speed, and high sensitivity. This study prepared hydrophilic and high-performance CdS/ZnS quantum dots (QDs) for DA detection. The waterborne CdS/ZnS QDs were synthesized in one step using the amphiphilic polymer PEI-g-C14, obtained by grafting tetradecane (C14) to polyethyleneimine (PEI), as a template. The polyacrylonitrile nanofiber membrane (PAN-NFM) was prepared by electrospinning (e-spinning), and a metal organic frame (ZIF-8) was deposited in situ on the surface of the PAN-NFM. The CdS/ZnS QDs were loaded onto this substrate (ZIF-8@PAN-NFM). The results showed that after the deposition of ZIF-8, the water contact angle of the hydrophobic PAN-NFM decreased to within 40°. The nanofiber membrane loaded with QDs also exhibited significant changes in fluorescence in the presence of DA at different concentrations, which could be applied as a fast detection method of DA with high sensitivity. Meanwhile, the fluorescence on this PAN-NFM could be visually observed as it transitioned from a blue-green color to colorless, making it suitable for the real-time detection of DA.
研究领域:
生物化学
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材料科学
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医学检测
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DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 48
·15285-15291
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IF 6.641
Mingrui Liu,Lijin Wang,Zhongyuan Guan,Zhenyang Liu,Yongsheng Zhu,Aiwei Tang
The optical properties of doped semiconductor nanocrystals (NCs) are strongly affected by the dopant position inside the host lattice. However, controlling the dopant position in Cu(I) doped core/shell semiconductor NCs is still unexplored due to the high ionic mobility of Cu(I) ions at the doping temperature. In this paper, we report the doping of Cu(I) ions into CdS/ZnS core/shell NCs via a cation exchange strategy. During the doping, the exciton emission of CdS NCs is reduced and the dopant emission becomes intensified as the doping level is increased from 0 to 1.1%, and the PL profile of the final product is very similar to that of uncoated CdS:Cu(I) NCs. Such an optical change is very different from that observed in the products synthesized by a conventional method, in which no exciton emission of CdS NCs is observed. During the Cu(I) doping process, the variation of the dopant emission may arise from the doping position change from the outside ZnS shell to the inside CdS core in the CdS/ZnS core/shell NCs. The deduction can be further verified by the optical change by direct heating of a small amount of Cu(I) doped CdS/ZnS NCs in a non-coordinating solvent. This work offers a cation exchange strategy for fabricating Cu(I) doped core/shell NCs with tuned dopant positions, which will open up rich opportunities for tuning the optoelectronic properties of Cu(I) doped semiconductor NCs.
研究领域:
材料科学
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光学
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DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Qian Wu,Li Tian,Xiangyu Shan,Shuning Yang,Huiling Li,Chao Li,Juan Lu
A novel electrochemiluminescence (ECL) sensor was constructed for the detection of permethrin by modifying Fe 3 CuO 4 –Ru(bpy) 3 2+ and GO-CdS@ZnS on the electrode. Fe 3 CuO 4 was used as a carrier to adsorb more luminous reagent Ru(bpy) 3 2+ to promote luminescence. Meanwhile, it also can be used as a co-reaction promoter to amplify the initial signal of Ru(bpy) 3 2+ -tri-n-propylamine (TPrA) system. When GO-CdS@ZnS was introduced into this system, the ECL signal was further enhanced. The porous nature of graphene oxide (GO) was utilized to load a large amount of CdS@ZnS, in which CdS@ZnS acted as the co-reactant to amplify the ECL signal. The amount of permethrin (PMT) increased and the ECL signal decreased. Under the optimum conditions, the ECL response was linearly related to the logarithm of PMT concentration. The developed ECL sensor allowed for sensitive determination of PMT and exhibited a wide linear range from 1.0 × 10 −11 mol L −1 to 1.0 × 10 −7 mol L −1 . The limit of detection was 3.3 × 10 −12 mol L −1 (S/N = 3). It can be used for the detection of PMT in vegetable samples.
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DOI
PubMed
高影响因子
Food Bioscience
·
2025
·
IF 5.9
Jia Liu,Bin Yang,Shiyue Niu,Xin Liu,Xian Wang,Liqian Niu,Shuyun Bi
At present, the application range of tetracycline (TCs) is very wide, and excessive residue will pose a threat to the health of consumers. However, there is a lack of methods more suitable for on-site detection. In order to ensure food safety, CdS@ZnS QDs and zeolitic imidazolate framework-8 (ZIF-8) were hybrid to obtain the composite CdS@ZnS QDs@ZIF-8, which was used as fluorescent probe to establish real-time methods for the detection of minocycline (MC) and doxycycline (DC). The quantum yield (QY) of the prepared composite CdS@ZnS QDs@ZIF-8 was 20.76 %. The MC/DC quenched the fluorescence of CdS@ZnS QDs@ZIF-8 in a static manner, which was confirmed by Stern-Volmer and time-resolved fluorescence analysis. The binding constant at 293 K was obtained and electrostatic force was found to play a leading role in the two binding processes. The optimal pH, contact time and temperature for the determinations were obtained. The interferences of some common metal ions, glucose, BSA, DNA, HSA and tryptophan on the detections were investigated. The linear relationship between the concentration of MC/DC and the fluorescence intensity ratio was established. The limits of detection (LODs) were 10.06 and 11.24 ng mL −1 (3 S 0 / S ) for MC and DC. The methods were successfully applied to the detection of MC and DC in egg samples with good recovery and precision.
研究领域:
食品安全
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分析化学
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生物医学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 35
·26313-26321
·
IF 2.779
Wei Song,Luo Xiang,Miao Juhong,Zhang Lei
Cd-based quantum dot light-emitting diodes (QLEDs) have outstanding optical properties, which are promising for a wide range of applications in the fields of lighting and display. However, it is still a research hotspot to prepare high-quality quantum dots (QDs) which can satisfy the requirements of preparing high-performance devices. Here, we develop a facile method to prepare high-quality alloyed CdSeS/CdS/ZnS QDs with a single precursor material, and the as-prepared alloyed QDs have high luminous intensity and narrow size distribution. The alloyed QDs have a uniform and gradient internal structure, there is no abrupt boundary in the final alloyed QDs. This is beneficial to reducing the carrier injection barrier and improving the carrier injection efficiency of electroluminescent devices. The alloyed gradient core/shell QDs-based green QLEDs were fabricated successfully and maximum current efficiency of 33.7 cd/A was obtained. This paper will provide a new strategy to prepare high-performance QLED devices.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Xinbing Jiang,Shaochong Zhu,Huan Yang,Yuxi Fei,Jiuhong Wang,Shujiang Ding
Intracellular three-dimensional (3D) thermal mapping is a valuable technical tool for answering fundamental scientific questions about cellular thermal behavior and subcellular diagnostic therapy. The best method for achieving intracellular 3D thermal imaging is to collect intracellular temperature response while also obtaining a 3D position for the corresponding location. However, temperature measurement in cell space has not been accurately characterized due to the difficulty in accurately locating the 3D position in microregions. In this article, we developed a QD-based intracellular 3D thermal imaging system by combining QD fluorescence thermometry with double-helical point spread function (DH-PSF)-based axial localization. Liposome transfection was used to achieve the cellular uptake of CdTe/CdS/ZnS QDs in HOS cells. Five QDs’ temperatures with spatial distribution in living cells were realized in the axial range of 1.35 μm by collecting the thermosensitive fluorescence emission of discrete QDs and the axial imaging localization information, and their 3D thermal image distribution was mapped. Measurements and analysis show that the combination of QD fluorescence thermometry and axial localization of DH-PSF enables the acquisition of thermal image information in intracellular 3D microregions. Using this system, temperature variations at 3D locations in living cells exposed to ionomycin Ca2+ stress were also monitored. The method described in this article can be applied broadly to the study of intracellular space thermal response and thermal regulation.
研究领域:
生物物理学
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纳米医学
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细胞生物学
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产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2025
·
IF 4.7
Senyang Wang,Shi Tang,Mengting Hua,Yuxuan Chen,Dantian Zhang,Rao Fan,Ling Li
Raspberry-like double-core shell CdS@ZnS@NiS material was prepared to use a simple one-step hydrothermal method, and then coated uniformly on carbon nanofibers (CNFs), resulting in the formation of highly efficient counter electrode (CE) for Zn-Cu-In-Se (ZCISe) quantum dot sensitized solar cells (QDSSCs). The QDSSCs used CdS@ZnS@NiS/CNFs as CE reached power conversion efficiency (PCE) of 9.72 %, which is higher than Cu 2 S/brass (8.42 %). This result indicates the dual-core shell structure possesses better catalytic properties, which indicates that the raspberry-shaped double-core shell CdS@ZnS@NiS is a feasible competitor as CE material for QDSSCs.
研究领域:
材料科学
·
光伏技术
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纳米技术
·
能源材料
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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）