INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Siqi Wang,Jiawang Liu,Meiting Chen,Xueqi An,Shuang Guo,Zihui Liang,Ping Wang,Yinghui Wang,Xiaotian Yang
Semiconductor quantum dots (QDs) are attractive building blocks for photocatalytic hydrogen evolution because their optical and electronic properties can be tailored through nanoscale structural design. However, in many QD-based hybrid systems, limited interfacial coupling between the QDs and cocatalyst hinders charge transfer and obscures the relationship between the interfacial structure and function. Herein, we report a Ni-modified giant reverse type-I CdS/CdSe core/shell QD system prepared by photodeposition, in which the Ni loading can be quantitatively tuned from 1 to 7 atoms per QD. Structural and spectroscopic characterizations indicate that the deposited Ni species are intimately associated with the CdS/CdSe QDs, while the giant core/shell architecture is retained. This interfacial modification leads to systematic changes in charge-carrier behavior, as evidenced by photoluminescence, photocurrent, electrochemical impedance, transient photovoltage, and transient absorption measurements. Among the series, CdS/CdSe-Ni4 exhibits the most efficient visible-light-driven hydrogen evolution, with a rate of 4492 μmol g–1 h–1 and a turnover frequency of 2.6 s–1 per Ni site. The results show that the regulation of the QD/Ni interface plays an important role in promoting electron extraction and interfacial charge transfer. This study provides a useful model for understanding how surface metal-site modification influences the photophysical and photocatalytic properties of colloidal semiconductor core/shell nanostructures.
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高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 29
·9634-9642
·
IF 4.099
Shuqi Lu,Shanglong Peng,Zhiya Zhang,Yunlong Deng,Tianfeng Qin,Juanjuan Huang,Fei Ma,Juan Hou,Guozhong Cao
Surface passivation in quantum dot-sensitized solar cells (QDSSCs) plays a very important role in preventing surface charge recombination and thus enhancing the power conversion efficiency (PCE). ZnSe passivation with dopant in CdS/CdSe co-sensitized QDSSCs has been demonstrated as an effective way to improve the PCE. In the present study, a series of characterizations revealed that a Mn-doped ZnSe passivation layer can not only reduce surface charge recombination, but also enhance light harvesting. By means of density functional theory calculation along with a systematic study of electronic band structure, it has been found that the valence band of ZnSe moves upward on Mn-ion doping which leads to acceleration of charge separation and broader light absorption range. The impact of the Mn ion on charge recombination and light harvesting has been interpreted reasonably and the PCE of CdS/CdSe co-sensitized QDSSCs with Mn-doped ZnSe passivation layer is as high as 6.46%, which is 1.5 times that of the solar cell without the passivation layer.
研究领域:
材料科学
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能源科学
·
计算化学
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JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2024
·
IF 4.1
Libo Yu,Zhen Li,Weiqiang Qiao,Junke Wang,Chengshuang Zhao
Light harvesting plays crucial role for high photovoltaic performance of quantum dots sensitized solar cell (QDSSC). However, there are still issues need to be tackled, such as enlarging light response range and enhancing light scattering capability. In this work, TiO 2 eggshell hollow microspheres (EHMS) were synthesized by carbonaceous microspheres (CMS) template method and co-sensitized by CdS/CdSe/PbS quantum dots (QDs) for application in QDSSC . Compared with QDSSC based on TiO 2 nanoparticles (NP) and TiO 2 hollow microspheres (HMS), the TiO 2 EHMS based QDSSC showed a remarkable increase of short-circuit current density (J sc ) to 24.81 mA cm −2 with a power conversion efficiency (PCE) of 4.07 %. Photoelectrochemical analysis of QDSSC indicate that CdS/CdSe/PbS QDs can enlarge the light response range, and the TiO 2 EHMS improve the light scattering, leading to the improvement of light harvesting efficiency. Charges dynamics tests results proved that a larger charges recombination resistance at photoanode/electrolyte interface and longer electron lifetime can be achieved with TiO 2 EHMS, contributing to the boost of J sc . The presented study introduces a simple strategy for researchers interested in designing photoanode for various photoelectrochemical applications.
研究领域:
材料科学
·
光电化学
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Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-8
·
IF 2.584
Yan Xinyu,Wang Kan,Lu Wenting,Qin Weijian,Cui Daxiang,He Jinghua
Carbohydrate antigen 72-4 (CA72-4) is an important biomarker associated closely with diagnosis and prognosis of early gastric cancer. How to realize quick, sensitive, specific, and quantitative detection of CA72-4 in clinical specimens has become a great requirement. Herein, we reported a CdSe/ZnS quantum dot-labeled lateral flow test strip combined with a charge-coupled device (CCD)-based reader was developed for rapid, sensitive, and quantitative detection of CA72-4. Two mouse monoclonal antibodies (mAbs) against CA72-4 were employed. One of them was coated as a test line, while another mAb was labeled with quantum dots and coated onto conjugate pad. The goat anti-mouse IgG was immobilized as a control line. After sample was added, a sandwich structure was formed with CA72-4 and these two mAbs. The fluorescent signal from quantum dots (QD)-labeled mAb in sandwich structure was related to the amount of detected CA72-4. A CCD-based reader was used to realize quantitative detection of CA72-4. Results showed that developed QD-labeled lateral flow strips to detect CA72-4 biomarker with the sensitivity of 2 IU/mL and 10 min detection time. One hundred sera samples from clinical patients with gastric cancer and healthy people were used to confirm specificity of this strip method; results showed that established strip method own 100 % reproducibility and 100 % specificity compared with Roche electrochemiluminescence assay results. In conclusion, CdSe/ZnS quantum dot-labeled lateral flow strips for detection of CA72-4 could realize rapid, sensitive, and specific detection of clinical samples and could own great potential in clinical translation in near future.
研究领域:
医学诊断
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生物化学
·
纳米技术
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高影响因子
RSC Advances
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2013
·Vol. 4
·期 6
·2764-2771
·
IF 2.562
Guozhen Fang,Chao Fan,Huilin Liu,Mingfei Pan,Huidan Zhu,Shuo Wang
A novel molecularly imprinted optosensing material (MIOM) based on ionic liquid (IL)-stabilized CdSe/ZnS quantum dots (QDs) was prepared, for highly selective and sensitive recognition of the mycotoxin zearalenone (ZON). ZON is expensive and highly toxic, so the ZON analog cyclodo-decanyl-2,4-dihydroxybenzoate (CDHB) was instead used as the template. MIOM was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and adsorption experiment. Under optimal conditions, the relative fluorescence intensity of MIOM decreased linearly with increasing ZON concentration, in the range of 0.003–3.12 μmol L−1. MIOM had a detection limit of 0.002 μmol L−1. MIOM was used to detect ZON in corn, rice and wheat flours, and at three concentration levels 50, 100 and 500 ng g−1, ZON recoveries for these three cereals were 94.2–98.7%, 93.1–107.6% and 84.4–106.0%, respectively.
研究领域:
食品科学
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分析化学
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Advanced Optical Materials
·
2023
·
IF 9
Li Wen,Yifan Xie,Peng Yang,Hongli Zhang,Jiahe Li,Zeyu Feng,Gang Zou
Chiroptical materials with strong and switchable circularly polarized luminescence (CPL) properties have gained considerable interest due to their feasible applications in optoelectronic devices, sensing, and information encryption. However, in most cases, their luminescence dissymmetry factor (g lum ) and figure of merit (FOM) values remain very low. Herein, a novel heterogeneous twisted-stacking structure is proposed, which endows with strong CPL amplification (a maximum of ≈15-fold enhancement) over traditional homogeneous structures and a high FOM value up to 0.11. Interestingly, their CPL performance (including the sign, magnitude, and spectral position) and the FOM values can be precisely manipulated or even inversed by simply uniaxial stretching, since the phase retardation of the anisotropic poly (vinyl alcohol) layer can be controlled. Moreover, by combining with the viologen gel electrochromic system, the in situ voltage-driven switching and patterning of the CPL signal can be successfully achieved, with low operation voltage and good cycling stability. This study provides a creative strategy for fabricating strong and electrical switchable CPL-active materials, which promise new opportunities in miniaturized smart electrochiroptical devices for future information technology.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
·
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.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Yunxia Hu,Chaomin Chen,Yuan Liu,Sui Wang,Zhiyong Guo,Yufang Hu
In the present work, a dual signals electrochemiluminescence (ECL) ratiometric strategy was designed based on the synergic effect of the catalysis effect and ECL resonance energy transfer . It was found that CdSe quantum dots (CdSe QDs) can catalyze the oxidation of luminol to promote the signal intensity of luminol at 0.45 V. At the same time, a stronger cathodic ECL peak at −0.75 V from CdSe QDs was observed, which could be attributed to the resonance energy transfer between luminol as a donor and CdSe QDs as an acceptor. Moreover both signals from two different potentials increased with the increase hydrogen peroxide concentration. On the basis of the above results, an enzyme-free ECL sensor was fabricated by immobilization of coating CdSe QDs on Au-graphite oxide (GO-Au) composites modified glassy carbon electrode (GCE), and luminol solution as probe solution, which was used to detect rapidly and sensitively hydrogen peroxide in the range of 0.5–500 μM with a detection limit of 0.5 μM based on the ration of two signals. The sensor exhibited good reproducibility and sensitivity, suggesting that the simple method will be promising in the detection of active oxygen in environmental samples.
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Journal of Environmental Sciences
·
2017
·
IF 2.865
Jiangsu Wen,Changchang Ma,Pengwei Huo,Xinlin Liu,Maobin Wei,Yang Liu,Xin Yao,Zhongfei Ma,Yongsheng Yan
Visible-light-driven photocatalysis as a green technology has attracted a lot of attention due to its potential applications in environmental remediation. Vesicle CdSe nano-semiconductor photocatalyst are successfully prepared by a gas template method and characterized by a variety of methods. The vesicle CdSe nano-semiconductors display enhanced photocatalytic performance for the degradation of tetracycline hydrochloride, the photodegradation rate of 78.824% was achieved by vesicle CdSe, which exhibited an increase of 31.779% compared to granular CdSe. Such an exceptional photocatalytic capability can be attributed to the unique structure of the vesicle CdSe nano-semiconductor with enhanced light absorption ability and excellent carrier transport capability. Meanwhile, the large surface area of the vesicle CdSe nano-semiconductor can increase the contact probability between catalyst and target and provide more surface-active centers. The photocatalytic mechanisms are analyzed by active species quenching. It indicates that h + and O 2 − are the main active species which play a major role in catalyzing environmental toxic pollutants . Simultaneously, the vesicle CdSe nano-semiconductor had high efficiency and stability.
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CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Yue Huang,Kai Dai,Jinfeng Zhang,Graham Dawson
Non-stoichiometric W 18 O 49 (WO) prepared by solvothermal method has excellent NIR absorption due to the localized surface plasmon resonance effect caused by oxygen vacancies. This has great potential in the field of using sunlight to convert carbon dioxide into organic fuels. In addition, through the amination of CdSe, the one-dimensional/two-dimensional step-scheme (S-scheme) WO/CdSe-diethylenetriamine (WO/CdSe-D) photocatalyst with electron transmission channels driven by visible light to NIR light is constructed by microwave solvothermal method. The LSPR of WO and the synergistic effect of coupling semiconductors to construct S-scheme heterojunctions can improve light utilization and achieve efficient charge carrier transfer efficiency. The optimized photocatalyst of 35%WO/CdSe-D has the best CO 2 reduction performance compared to WO and CdSe-D, and the yield is 25.37 µmol h –1 g –1 . X-ray photoelectron spectroscopy was used to verify the charge transfer path of the S-scheme WO/CdSe-D heterojunction. This work provides a possibility for the application of non-stoichiometric oxides rich in oxygen vacancies in the field of photocatalytic CO 2 reduction.
研究领域:
材料科学
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环境科学
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能源科学
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Toxins
·
2022
·Vol. 14
·期 10
·710
·
IF 5.075
Shasha Feng,Wei Hu,Fubin Pei,Zhiwei Liu,Bin Du,Xihui Mu,Bing Liu,Qingli Hao,Wu Lei,Zhaoyang Tong
A sensitive dual-readout immunosensor for fluorescence and electrochemiluminescence (ECL) detection of ricin was established, which was combined with a streptavidin–biotin signal amplification system. CdSe/ZnS quantum dots with fine fluorescence and ECL properties were used as the dual-signal function probes of the sandwich immunocomplex. Under the optimum experimental conditions, the dual signal intensity increased significantly with the rise in ricin concentration. The fluorescence intensity of the senor exhibited a good liner relationship toward the ricin concentrations with 0.1~100 ng/mL and the limit of detection (LOD) was 81.7 pg/mL; taking ECL as the detection signal, the sensor showed a linear relationship with the ricin concentrations ranging from 0.01 ng/mL to 100 ng/mL and the LOD was 5.5 pg/mL. The constructed sensor with high sensitivity had been successfully applied to the detection of ricin in complex matrices with satisfactory recoveries. The proposed immunosensor model can be extended to the analysis and detection of others target proteins.Keywords:immunosensor;ricin;fluorescence;electrochemiluminescence;dual readout;CdSe/ZnS quantum dotsKey Contribution:A dual-readout (fluorescence and ECL) immunosensor for ricin detection was established based on CdSe/ZnS quantum dots with dual signal, which was combined with a streptavidin–biotin signal amplification system.
研究领域:
分析化学
·
生物化学
·
纳米技术
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高影响因子
MOLECULES
·
2026
·Vol. 31
·期 17
·2989
·
IF 5.1
Dongdong Shi,Guiqin Yan
Herein, a highly selective and sensitive fluorescent sensing system is developed for the accurate quantitative determination of γ-Hexachlorocyclohexane (γ-HCH, Lindane). With carboxyl-functionalized CdSe/ZnS core–shell quantum dots (QDs) as the substrate, 3-Aminophenylboronic acid (3-APBA) is covalently conjugated onto the quantum dot surface via an amidation reaction. Systematic characterizations are used to confirm the successful fabrication of the CdSe/ZnS-COOH@3-APBA fluorescent probe, which exhibits excellent luminescence properties and superior colloidal dispersion stability. Under optimal experimental conditions, an increased γ-HCH concentration induces gradual attenuation of the probe fluorescence intensity. A favorable linear correlation is achieved within 10–140 nM, and the limit of detection is 2.62 nM. Mechanistic studies reveal that γ-HCH binds to 3-APBA on the probe surface via halogen bonding to form non-fluorescent ground-state association complexes, thereby triggering static quenching of the probe. This method can effectively distinguish α-, β-, and δ-hexachlorocyclohexane isomers. With the merits of simple operation, high sensitivity, excellent stability, and strong anti-interference capability, it provides a new strategy for the rapid screening and accurate quantification of γ-HCH residues in environmental and food matrices.
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