JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Hongqi Shi,Chun Tian,Shanshan Wang,Jiajun Fang,Xingguo Xu,Xinnian Guo
Residual antibiotics in aquatic environments pose significant ecological challenges. Photocatalytic oxidation technology is highly effective in eliminating these contaminants. The layered perovskite semiconductor SrBi 4 Ti 4 O 15 (SBTO) exhibits exceptional photocatalytic potential due to its stability and robust oxidative capacity. However, its wide bandgap and rapid recombination of photogenerated carriers limit its efficiency. To address these limitations, we developed a CdSe quantum dot/SrBi 4 Ti 4 O 15 (CS/SBTO) composite. The results show that CdSe quantum dots are uniformly distributed on SBTO nanosheets, increasing the specific surface area and extending visible light absorption. The formed Z-scheme heterojunction significantly enhances photocatalytic degradation efficiency, achieving a degradation rate 6.5 times higher than that of SBTO alone. Radical trapping experiments indicate the involvement of holes, hydroxyl radicals, and superoxide radicals in the reaction. Cycling tests demonstrate the composite's good stability. The degradation pathway was elucidated based on intermediates detected by HPLC-MS. This study provides a foundational basis for developing efficient photocatalytic water purification technologies.
研究领域:
环境科学
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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
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
Hu Shen,Song Zhang,Mengqi Jin,Rong Liu,Dong Yang,Xin Zhou,Shengmin Wang,Zhitao Shen,Ying Liu,Fumin Li,Huilin Li,Ruirui Cao,Chong Chen
Cadmium selenide (CdSe) quantum dots (QDs) as functional interface layer have been used to improve the performances of perovskite solar cells (PSCs). However, the optimization of PSCs by CdSe QDs has some challenges of inferior performances for charge transportation, and interface defects, which are not conducive to the development of power conversion efficiency (PCE). Here, sodium thiosulfate capped CdSe QDs (S 2 O 3 2- -CdSe QDs) are prepared as interface modifiers to improve the performances of PSCs. The S 2 O 3 2- -CdSe QDs can effectively passivate defects and reduce interfacial nonradiative recombination, Moreover, the S 2 O 3 2- -CdSe QDs regulate the energy level of perovskite film. In addition, the S 2 O 3 2- -CdSe QDs form an interface layer to increase moisture resistance and improve the stability of PSCs. As a result, the devices with S 2 O 3 2- -CdSe QDs show an improved power conversion efficiency (PCE) of 22.57 %. Meanwhile, the stabilities of the unencapsulated device with S 2 O 3 2- -CdSe QDs under 25 °C with a humidity of 30 %–40 %, and 85 °C in N 2 heat both perform better than the control devices.
研究领域:
材料科学
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能源技术
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纳米科技
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2015
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IF 7.435
Mingjun Zhou,Donglai Han,Xinlin Liu,Changchang Ma,Huiqin Wang,Yanfeng Tang,Pengwei Huo,Weidong Shi,Yongsheng Yan,Jinghai Yang
Quantum dots (QDs) CdSe exhibits relatively high photocatalytic abilities for its unique properties, but the aggregation and photocorrosion have blocked its further application. Therefore, for arriving at a solution, alkaline earth metal ions (M = Mg 2+ , Ca 2+ , Sr 2+ and Ba 2+ ) and reduced graphene oxide (rGO) are chosen to fabricated new QDs CdSe-based photocatalytic systems. In this paper, M@CdSe/rGO composites have been synthesized via a facile one-step hydrothermal approach, during which the formation of M doped CdSe crystallization and GO reduction occur simultaneously. The obtained photocatalysts demonstrates synergistically enhanced visible light photocatalytic activity and stability toward photodegrading tetracycline hydrochloride (TC-HCl) solution, especially the introduction of 6 mol% Ca 2+ and 5 wt% GO on QDs CdSe resulted in 85.6% degradation of 15 mg/L TC-HCl in 1 h with 0.5 g/L catalyst. Furthermore, the photodegradation mechanism was systematically investigated by active species trapping experiment. It revealed that h + was the major active species in the destructions process. And the possible process of charge transfer for Ca 2+ @CdSe/rGO nanocomposite was proposed based on the experimental results.
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
Nanoscale
·
2015
·Vol. 7
·期 13
·5767-5775
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IF 7.394
Ping Wang,Jie Zhang,Haili He,Xiaolong Xu,Yongdong Jin
The use of colloidal semiconductor nanocrystals (NCs), especially those with a core/shell structure, for photocatalytic hydrogen (H2) production from water is currently one of the hottest research fields. Although the ligand on the semiconductor NC surface is crucial to the optical and optoelectronic properties of the NC, the study of the ligand effect on the photocatalytic activity of H2 generation is rarely reported. Herein, we employ nearly monodispersed CdSe/CdS core/shell NCs as a model photocatalytic system, and three kinds of ligands with different numbers of functional thiol groups (i.e., poly(acrylic acid), 3-mercaptopropionic acid and 2,3-dimercaptosuccinic acid) are selected as the ligands to investigate the effect of ligand on the efficiency of H2 photogeneration. The results show that the H2 photogeneration efficiency is highly dependent on the surface ligand of the NCs, and it increases with the increase of the number of the functional thiol groups in the ligand, and correspondingly, the photoluminescence intensity and average fluorescence lifetime, which are measured by steady state and time-resolved fluorescence measurements, are decreased. The surface trap-related charge separation efficiency, which is mediated by surface coating with different ligands, is supposed to cause the distinct ligand-dependent performance in the H2 evolution.
研究领域:
材料科学
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光化学
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纳米技术
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 10
·9363-9371
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IF 2.195
Xue Xiangxin,Chen Lei,Zhao Cuimei,Wang Hairui,Nie Ping,Chang Limin
In this paper, the photocatalytic behavior of CdSe/CdS quantum dots (QDs) in reducing the graphene oxide (GO) with different surface ligands was investigated. Here, three surface ligands of different functional groups (oleic acid, poly (acrylic acid polymers) and S 2− ) were selected to study the influence of surface ligands on photocatalytic behavior of the CdSe/CdS QDs. Meanwhile, the obtained samples can be used as photocatalyst, and the photocatalytic activity was evaluated by photodegrading a methylene blue solution. It turned out that the QDs–S 2− –GO sample showed the highest photocatalytic activity under visible-light irradiation. Different surface ligand has different influence on the charge separation efficiency, which has different influence on photocatalytic behavior. The results show that the photocatalytic behavior is highly dependent on the electron attracting ability of the surface ligands on the CdSe/CdS QDs. Finally, a possible photocatalytic mechanism is proposed.
研究领域:
材料科学
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光催化
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DOI
高影响因子
OPTICS EXPRESS
·
2019
·Vol. 27
·期 6
·7935-7944
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IF 3.561
Yanbin Zhang,Fengjuan Zhang,Hongzhe Wang,Lei Wang,Fangfang Wang,Qingli Lin,Huaibin Shen,Lin Song Li
In this paper, we report the synthesis, the structural and optical characterization of CdSe/CdS//CdS nanorods (NRs) and their exploitation in nanorod-based light-emitting diodes (NR-LEDs). Two kinds of NRs of CdSe/CdS and CdSe/CdS//CdS were incorporated into the structure of solution-processed hybrid NR-LEDs. Compared to CdSe/CdS, the efficiencies of CdSe/CdS//CdS NR-based LEDs are overwhelmingly higher, specifically showing unprecedented values of peak current efficiency of 19.8 cd/A and external quantum efficiency of 15.7%. Such excellent results are likely attributable to a unique structure in CdSe/CdS//CdS NRs with a relatively high quantum yield, thick CdS outer shell, and rod structure which minimize nonradiative energy transfer between closely packed NRs in emitting layer.
研究领域:
材料科学
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纳米技术
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光电
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2018
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IF 2.891
Xing Du,Weixin Li,Lei Zhao,Xuan He,Hui Chen,Wei Fang
A facile in-situ modification of photoanode is proposed to construct a unique hierarchical TiO 2 /ZnO structure with the aim at suppressing charge recombination rate and enhancing light harvest efficiency. Foam is not only employed as the soft template to fabricate hierarchical porous TiO 2 films but also as the carrier to realize in-situ growth of one dimensional ZnO nanowires among the TiO 2 nanoparticles. The results revealed that the hierarchical porous TiO 2 nanoparticles could provide both large surface areas and suitable porosity for the loading of quantum dots. In the meantime, ZnO nanowire can act as scattering centers for light absorption and offer direct pathways for electron transportation, thus decreasing the undesired charge recombination process. Consequently, the novel ZnO nanowires in-situ modified hierarchical porous TiO 2 photoanode are used as photoanode material to boost the performances of CdSe sensitized solar cells by virtue of controlling the moderate growth of ZnO nanowires. As a result, a power conversion efficiency of 3.07% is obtained based on this modified photoanode, which manifests 39.5% improvement compared to that of the cells based on bare TiO 2 hierarchical porous films (2.20%) due to the improved interconnections between TiO 2 nanoparticles and FTO substrate caused by ZnO nanowires.
研究领域:
材料科学
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能源科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
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IF 4.803
Ying Yang,Qiao Liu,Xing-Pei Liu,Ping-Zhen Liu,Chang-Jie Mao,He-Lin Niu,Bao-Kang Jin,Sheng-Yi Zhang
A novel multifunctional reduced graphene oxide (RGO)/Fe 3 O 4 /PDDA/CdSe nanocomposite has been successfully prepared and used as probe for an electrochemiluminescence (ECL) immunosensor of human interleukin-6 (IL-6). The prepared RGO/Fe 3 O 4 /PDDA/CdSe nanocomposite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–vis) absorption spectroscopy , and a vibrating sample magnetometer (VSM). This nanocomposite shows magnetism, ECL properties, and good biocompatibility. Furthermore, the RGO/Fe 3 O 4 /PDDA/CdSe nanomaterial was applied to develop an ultrasensitive ECL immunosensor for detection of IL-6. The ECL intensity decreased linearly with the IL-6 concentrations in the range 0.002 to 20 ng/mL. Furthermore, the developed ECL immunosensor with high sensitivity, stability and excellent reproducibility can be used for detection of real samples, which make it possible to be used in clinical detection.
研究领域:
材料科学
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纳米技术
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分析化学
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生物传感器
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生物医学工程
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
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IF 4.831
Zhiqiang Zhou,Jianfang Cen,Naijia Jiang,Yu Sun,Zhouyang Li,Liyun Yang
With the widespread application of Ag + in modern life and industry, the potential hazardous effects of Ag + to environment and humans have attracted great concerns. Thus, effective and rapid strategies for Ag + detection are highly desirable. In this paper, a novel ratiometric fluorescence sensor using CdSe quantum dots (QDs) has been constructed for sensitive and selective detection of Ag + , which is based on the formation of Ag 2 Se QDs. CdSe QDs were initially prepared and showed single wavelength emission at 510 nm. When Ag + exists, a rising peak appeared at 650 nm and the emission at 510 nm declined, exhibiting distinct ratiometric fluorescence emission ( I 650 / I 510 ) characteristic with a linear response over the Ag + concentration range of 0.01–4 μM. Significantly, the fluorescence changed from green to red. The detection limit of the constructed sensor is 1.4 nM. Furthermore, the sensing assay can be successfully applied to detect Ag + in real water samples and living cells.
研究领域:
分析化学
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环境科学
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生物医学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 41
·11104-11110
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IF 5.976
Song Wei,Yue Liu,Mingyue Ma,Yao Wu,Lijian Huang,Daocheng Pan
To reduce the charge injection barrier, we attempt to synthesize thin-shell CdSe/ZnxCd1−xS core/shell quantum dots (QDs) in this work. A low-temperature (90–115 °C) synthetic scheme was developed for highly luminescent CdSe/ZnxCd1−xS core/shell QDs by employing short-chain tert-dodecanethiol as the ligand and low-boiling xylene or octane as the solvent. Thiol-capped CdSe/2ZnxCd1−xS core/shell QDs with two monolayers of the shells were directly synthesized in open air, including CdSe/2ZnS, CdSe/2Zn2/3Cd1/3S, CdSe/2Zn1/2Cd1/2S, CdSe/2Zn1/3Cd2/3S, CdSe/2CdS, and CdSe/1CdS/1ZnS core/shell QDs. These short-chain ligand capped and thin-shell QDs were used as the emitting layers to fabricate quantum dot light emitting diodes (QD-LEDs). The results showed that QDs coated with an alloyed Zn0.5Cd0.5S shell possess the optimal photoluminescence (PL) and electroluminescence (EL) properties as well as a maximum current efficiency of 12.5 cd A−1.
研究领域:
材料科学
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纳米技术
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光电技术
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2013
·Vol. 25
·期 32
·4397-4402
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IF 14.829
Yunlong Liu,Chunfeng Zhang,Huichao Zhang,Rui Wang,Zheng Hua,Xiaoyong Wang,Jiayu Zhang,Min Xiao
Graphical Benefiting from excitonic charge-transfer states, an efficient non-linear optical response is observed in type-II nanocrystals by four-wave mixing when the incident photon energy lies below the bandgaps of constituent semiconductors. The non-linear optical properties in nanocrystals can be manipulated by the band alignment of the core–shell components, which serves as a promising platform to design broadband non-linear optical devices.
研究领域:
纳米光子学
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材料科学
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凝聚态物理
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光学工程
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半导体物理学
✓ 已验证
DOI
高影响因子
SENSORS
·
2018
·Vol. 18
·期 9
·2980
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IF 2.475
Zhizhong Han,Qinghua Weng,Chaofan Lin,Jinquan Yi,Jie Kang
In this work, the CdSe–ZnO flower-rod core-shell structure (CSZFRs) was prepared by ion-exchange method. The surface of CSZFRs was modified by 3-mercaptopropionic acid (MPA), and then the DNA probe was immobilized on the surface via chemical bond between -NH2of DNA probe and -COOH of MPA. Finally, the target norovirous (NV) RNA was combined with the probe according to the principle of complementary base pairing, resulting in a decrease of the photocurrent. The results show that the absorbance spectrum of visible light is enhanced for CSZFRs compared with pure ZnO. Under visible light irradiation, the photocurrent of CSZFRs is up to 0.1 mA, which can improve the sensitivity of the photoelectrochemical (PEC) biosensor. In the measurement range of 0–5.10 nM, the measured concentrations (c) have a good linear relationship with the output photocurrent of the biosensor. The linear regression equation is expressed asI= 0.03256 − 0.0033c(R2= 0.99, S/N = 3) with a detection limit of 0.50 nM. Therefore, this work realizes a rapid and sensitive method for the detection of NV RNA.Keywords:CdSe–ZnO flower-rod;photoelectrochemical biosensor;norovirous RNA;ion-exchange method
研究领域:
材料科学
·
生物化学
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分析化学
·
病毒学
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产品关联
DOI
PubMed
高影响因子
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