CARBON
·
2022
·
IF 11.307
Chenxi Wang,Jia Chen,Li Zhang,Yaqi Yang,Minghui Huang,Chao Chen,Chunyan Li,Yixi Xie,Pengcheng Zhao,Junjie Fei
In this work, two-dimensional Zn carbon nanosheets (CNs) are obtained after heat treatment of in situ synthesized ZIF-8/NaCl nanocomposites , which are ultrasonically mixed with carboxylated multi-walled carbon nanotubes (MWCNTs). Subsequently, the nanocomposites Zn CNs-MWCNTs with large specific surface area and excellent catalytic properties are obtained. Meanwhile, the photoelectric material H–Cu 2 O/CdTe QDs are drop-coated on Zn CNs-MWCNTs/GCE and the modified electrode Zn CNs-MWCNTs/H–Cu 2 O/CdTe QDs/GCE is obtained. Eventually, a novel dopamine photoelectrochemical sensor based on Zn CNs-MWCNTs/H–Cu 2 O/CdTe QDs/GCE is constructed. Among them, the photocurrent intensity of H–Cu 2 O/CdTe QDs is much higher than that of pure H–Cu 2 O and pure CdTe QDs. This is due to the effective combination of CdTe QDs and H–Cu 2 O to form a p-p heterojunction , which can effectively suppress the recombination of electron-hole pairs. Subsequently, the working mechanism of the photoelectrochemical sensor is investigated in depth by the Kubelka-Munk model. At the same time, the photoelectrochemical sensor has reliable selectivity, stability, reproducibility and limit of detection (LOD = 0.3 nM), and also provides a new idea for the detection of dopamine.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
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IF 8.128
Ziyi You,Xiaoyang Yue,Dainan Zhang,Jiajie Fan,Quanjun Xiang
In recent years, the use of quantum dots (QDs) cocatalysts to improve the hydrogen evolution activity from the water splitting of photocatalysts has become a popular research topic. Herein, we successfully prepared a novel 0 dimension/2 dimension (0D/2D) heterojunction nanocomposite (denoted Ag 2 S quantum dots (QDs)/g-C 3 N 4 ) with excellent photocatalytic performance by anchoring the Ag 2 S QDs cocatalyst on the surface of g-C 3 N 4 through a self-assembly strategy. Ag 2 S QDs with an average particle size of approximately 5.8 nm were uniformly and tightly modified on g-C 3 N 4 . The Ag 2 S QDs/g-C 3 N 4 composite with 0.5 wt% Ag 2 S QDs loading achieved the highest hydrogen evolution rate of 471.1 μmol·g −1 ·h −1 with an apparent quantum efficiency (AQE) of 1.48% at 405 nm. Such remarkable hydrogen evolution activity far exceeded that of undoped g-C 3 N 4 and Ag 2 S nanoparticles (NPs)/g-C 3 N 4 . Moreover, it was 2.04 times the activity of Pt/g-C 3 N 4 with Pt as the cocatalyst. The enhanced photocatalytic performance was attributed to the energy band broadening of Ag 2 S QDs caused by the quantum size effect and the convenient and effective charge transfer between g-C 3 N 4 and Ag 2 S QDs cocatalysts. The mechanism underlying the enhanced photocatalytic H 2 evolution activity was further proposed. This study demonstrates that semiconductor-based quantum dots are strong candidates for excellent cocatalysts in photocatalysis.
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高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2024
·
IF 3.8
Hui Yingfei,Wang Mingyue,Liu Yinsheng,Peng Liping,Tian Jiaying,Ren Borong,Guo Hao,Yang Wu
In this study, a ratiometric fluorescent sensor CdTe QDs@ZIF-8 with butterfly spectra is successfully constructed by in situ encapsulating mercaptopropionic acid-modified CdTe quantum dots in zeolitic imidazolate framework-8 (ZIF-8) with a simple strategy, and used for the detection of tetracycline in fluorescence/smartphone colorimetry dual-mode. ZIF-8 not only reduces the agglomeration of the quantum dots but also surprisingly generates a new green fluorescence signal at 524 nm while the red fluorescence of the CdTe quantum dots at 650 nm quenches when tetracycline is added. The two opposing fluorescence signals create a butterfly-shaped fluorescence spectrum, allowing the sensor to detect tetracycline over a linear range of 0–70 μM with the detection limit (LOD) of 0.0155 μM by using a ratiometric fluorescence technique. What is more, based on the obvious color change of the fluorescent sensor gradually from red to green under UV light, a highly stable point-of-care testing sensor has been developed for on-site detection of tetracycline through color recognition by smartphones, which can be used for real-time detection of this antibiotic in the range of 0–1000 μM with the LOD of 0.0249 μM. This work provides a simple and efficient method for the on-site detection of tetracycline. Graphical Abstract
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高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Yao Jie,Chen Hongfang,Yang Xiaohua,Iqbal Muzaffar,Bian Wei
Mercury ions (Hg 2+ ) are categorized as environmental pollutants, which distributed in water, soil, and food systems due to environmental contamination. Hence, designing a sensitive assay for the convenient determination of Hg 2+ is of great importance. Herein, S and O-doped graphite phase nitrogenized carbon quantum dots (S, O-C 3 N 4 QDs) was encapsulated within a europium -based metal-organic framework (Eu-MOF) to construct a novel ratiometric fluorescent nanoprobe for the quantitative detection of Hg 2+ . The native emission of S, O-C 3 N 4 QDs at 445 nm is used as a response signal, while Eu-MOF with fluorescence offers a reference signal at 619 nm. Hg 2+ exhibits high affinity for the surface functional groups of S/O-C 3 N 4 QDs, forming non-fluorescent chelation complexes that induce static quenching. This results in significant attenuation of the fluorescence intensity at 445 nm, while the emission at 619 nm remains invariant. A ratiometric fluorescence sensing platform was established based on the intensity ratio (F 445 /F 619 ) for the selective detection of Hg 2+ . The linear range of S, O-C 3 N 4 QDs/Eu-MOF of Hg 2+ was 0.25–35 µM and with a detection limit of 4.3 nM. The satisfying results demonstrate the effectiveness of the developed S, O-C 3 N 4 QDs/Eu-MOF-based fluorescence probe for Hg 2+ detection, highlighting its promising potential for environmental monitoring applications.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2025
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IF 7.7
Yongjiao Sun,Jun Li,Yuchen Hou,Bingliang Wang,Wendong Zhang,Koichi Suematsu,Lin Chen,Jie Hu
Electrically conductive metal-organic frameworks (EC-MOFs) exhibit significant potential application as sensing materials for chemical resistance gas sensors. Herein, we developed a flexible gas sensor based on Ni 3 (HITP) 2 nanosheets co-functionalized with noble metal nanoparticles (NPs) and WS 2 quantum dots (QDs) for NO 2 detection at room temperature. The gas sensing performance was regulated by optimizing the metal species and loading ratios of WS 2 QDs. The measured results revealed that Au NPs and 2 mol% WS 2 achieved the most effective enhancement for NO 2 sensing performance. Therefore, Au NPs was selected to optimize WS 2 -2/Ni 3 (HITP) 2 sensor for further improving the sensing properties. A unique hierarchical structure based on gas sensor (Au 3 @WS 2 -2/Ni 3 (HITP) 2 sensor) enables high response (14.73 % to 5 ppm NO 2 ), rapid response/recovery time (97 s/110 s), good selectivity, anti-humidity, repeatability, long-term stability as well as flexibility at room temperature. Furthermore, density functional theory (DFT) and band theory were employed to comprehend adsorption energies and the electronic structures at atomic scale, elucidating the intrinsic correlation between NO 2 adsorption behavior and Ni 3 (HITP) 2 surface and the sensitization mechanism of heterostructures. These findings provide novel insights for designing high-performance NO 2 gas sensors worked at room temperature and guidance for EC-MOFs sensing mechanism.
研究领域:
材料科学
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化学传感
·
理论计算
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2021
·
IF 4.464
Hongmin Gao,Ze Zhang,Yingcong Zhang,Hongwei Yu,Shengzhong Rong,Lingqiang Meng,Shizhen Song,Yong Mei,Hongzhi Pan,Dong Chang
Resonance energy transfer (RET), as an efficient strategy, has been widely used for exploring a variety of biological processes and achieving sensitive bioanalysis. In this work, fluorescence and electrochemiluminescence (ECL) RET between graphitic carbon nitride (g-C 3 N 4 ) and NIR CdTe/CdS QDs was reported firstly. Based on this novel RET system, a sensitive sandwich-type ECL immunosensor was constructed to detect cancer antigen 125 (CA125). In this strategy, the ECL of Au NPs-functionalized graphitic carbon nitride nanohybrids (Au-g-C 3 N 4 NHs) was efficiently quenched by near-infrared CdTe/CdS quantum dots (NIR CdTe/CdS QDs), where NIR CdTe/CdS QDs acts as acceptors, and Au-g-C 3 N 4 NHs acts as donors. Au NPs improved the intensity and stability of ECL and provided sites to immobilize the antibody. Silica nanospheres carried abundant NIR CdTe/CdS QDs (QDs-SiO 2 ) labeling secondary antibodies, further enhancing the quenching effect. Under the optimum conditions, the constructed immunosensor showed excellent analytical performance with a linear concentration of CA125 from 0.0001 U mL −1 to 10 U mL −1 and the limit of detection reached 0.034 mU mL −1 (S/N = 3). Meanwhile, the immunosensor also revealed great stability, reproducibility, and selectivity and it could be applied in human serum samples successfully. This strategy provided a useful analytical method for the sensitive detection of biomarkers in the early stages of the disease and an innovative reference for developing more efficient and sensitive RET bioanalysis.
研究领域:
分析化学
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生物化学
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生物医学工程
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材料科学
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NEW JOURNAL OF CHEMISTRY
·
2023
·Vol. 47
·期 14
·6958-6966
·
IF 3.3
Xingyu Zhan,Hao Zhang,Yunxiong Zeng,Jingcai Xu,Ao Jin,Xinqing Wang,Jing Li,Yanting Yang,Bo Hong
Graphitic carbon nitride (CN) is considered to be a promising metal-free photocatalyst, but the charge carrier separation and rapid complexation of electrons and holes are difficult to modulate for effective and comprehensive photodegradation of TC. In this work, a MoS2 QD decorated sea-urchin carbon nitride nanohybrid was prepared via a water bath method. In comparison to the 85.6% degradation efficiency of sole sea-urchin carbon nitride (SUCN), the optimized 5% MoS2 QDs/SUCN (5%MSUCN) demonstrated a removal efficiency of 96.0% towards aqueous tetracycline (TC) under visible light. Such an outstanding photoactivity was mainly attributed to the interfacial synergistic effect of MoS2 QDs and SUCN, in which the outstanding charge extraction ability and quick surface kinetics of MoS2 QDs were primarily accountable for the subsequent deep photodegradation behavior of 5%MSUCN. A series of factors that may affect photoactivity of 5%MSUCN include pH values, inorganic ions, and organic matter. Finally, the deep photodegradation mechanisms of TC and intermediates were proposed based on ex situ HPLC-MS. This work not only explains the deep decomposition of TC but also presents a facile approach for designing and manufacturing carbon nitride nanohybrids.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2019
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IF 14.229
Yingying Jiao,Qunzeng Huang,Jianshe Wang,Zhanhang He,Zhongjun Li
A novel MoS 2 quantum dots (QDs) decorated g-C 3 N 4 nanosheet/N-doped carbon dots (NCDS) heterojunction photocatalyst was successfully synthesized by thermal polymerization and subsequent solvothermal approach. Under visible light (λ ≥ 420 nm) irradiation, the as-prepared g-C 3 N 4 /NCDS/MoS 2 composite with 3wt% of MoS 2 and 2wt% of NCDS displayed the highest photocatalytic hydrogen evolution activity with a corresponding H 2 evolution rate of 212.41μmol g −1 h −1 , which was about 53 times higher than that of g-C 3 N 4 /MoS 2 -3%. Moreover, the g-C 3 N 4 /NCDS/MoS 2 composite exhibited excellent photostability. The enhanced photocatalytic activity of g-C 3 N 4 /NCDS/MoS 2 composite was predominantly attributed to the formation of Z-scheme heterojunction between g-C 3 N 4 and NCDS, which effectively accelerated the transfer and separation of photogenerated charge carriers. Besides, the introduction of noble metal-free MoS 2 co-catalyst further promoted the separation of photogenerated charge carriers and provided more active sites for H 2 evolution reaction. The advantages of superior photocatalytic activity and excellent stability endowed a promising potential for g-C 3 N 4 /NCDS/MoS 2 composite to apply in photocatalytic fields.
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ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Fang Liu,Tiantian Lei,Yingli Zhang,Yaping Wang,Yu He
In this work, boron carbon oxynitride quantum dots (BCNO QDs) were prepared by a one-step hydrothermal process of ethanolamine and boric acid . BCNO QDs exhibited blue fluorescence with the optimal excitation/emission fluorescence peak at 335 and 420 nm, respectively. As an efficient fluorescence quencher , manganese dioxide (MnO 2 ) nanosheets can effectively quench the fluorescence of BCNO QDs via the inner filter effect (IFE). Acetylcholinesterase (AChE) catalyzes the hydrolysis of acetylcholine (ATCh) to produce thiocholine (TCh). TCh can reductively degrade MnO 2 nanosheets to generate Mn 2+ , thereby recovering the fluorescence of BCNO QDs. Organophosphorus pesticides (OPs) can inhibit the activity of AChE enzymes , thereby preventing the production of TCh and the decomposition of MnO 2 nanosheets, resulting in the fluorescence “turn-off”. Therefore, the concentration of OPs can be detected by measuring the fluorescence intensity change of AChE-ATCh-MnO 2 -BCNO-QDs system. Under optimal experimental conditions, the dynamic detection range of paraoxon is 0.1–250 ng mL −1 , and the detection limit is 0.03 ng mL −1 . Meanwhile, the reaction system also showed concentration-dependent visual color changes from colorless to brownish. Furthermore, we prepared a portable BCNO QDs test paper. By using a smartphone to identify the RGB values of the reaction solution and the corresponding test paper, we carried out the digital image chromaticity analysis, which can shorten the detection time and reduce the detection cost, and provide an effective solution for the rapid detection of OPs on site.
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CRYSTENGCOMM
·
2013
·Vol. 16
·期 8
·1547-1552
·
IF 3.879
Yang Huang,Zanyong Zhuang,Xiaogang Xue,Jinsheng Zheng,Zhang Lin
So far, the photoluminescence (PL) properties optimization of mercaptopropionic acid (MPA) capped CdTe has yet to be understood from a perspective of growth kinetics. In this work, the growth kinetics, size distribution and PL properties of CdTe quantum dots (QDs) grown in MPA aqueous solutions of two extreme concentrations, i.e. 0 mM and 50 mM, were systematically investigated. The studies revealed that CdTe QDs coarsen in low and high concentrations of MPA followed different growth kinetics, i.e. a mixed OA (Oriented Attachment)–OR (Ostwald Ripening) growth and an OA dominated growth, respectively. Moreover, the OR growth in a low MPA concentration solution was found to be disadvantageous for narrowing the size distribution but favourable for enhancing fluorescence, while the OA growth in a high MPA concentration solution is beneficial for focusing and controlling the particle size. Further activation energy calculations indicate that the extra MPA that forbids the OR growth and retards the OA growth is favourable for slowing the particle growth, thus achieving CdTe QDs with a controlled size and narrow distribution. Furthermore, the kinetics study reveals how the introduction of concentrated surface ligands affects the PL properties (FWHM and intensity) of the material.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Ziyan Hu,Zhongbing Huang,Juan Wang,Jirui Wen,Ximing Pu,Qianlei Lang,Peng Yang,Zhongxiang Shao,Jia Hu,Jiang Wu,Guangfu Yin
Typical symptoms of acute myocardial infarction (AMI) and acute aortic dissection (AAD) are similar chest pain, leading to higher clinical misdiagnosis rate, evenly the mortality rate of patients. In this work, ZrO 2 @PEI-QDs nanospheres with higher fluorescence were prepared by sequential electrostatic adsorption of branched PEI chains and CdSe/ZnS-COOH QDs on hollow ZrO 2 nanospheres. Three multi-channel LFIA strips (on sST2 and cTnI, cTnI and h-FABP, HMGB1 and sST2, respectively) based on ZrO 2 @PEI-QDs for rapid and correct distinguishing of AMI and ADD were constructed. Their visual limit of detection (vLOD for sST2 and cTnI, cTnI and h-FABP, HMGB1 and sST2) within 10–15 min reached 0.075 and 0.1 ng/mL, 0.1 and 1 ng/mL, 1 and 0.1 ng/mL, respectively, which were all lower than the normal level of healthy people. Compared with previous studies, ZrO 2 surface adsorbs more QDs, the fluorescence intensity was increased by about 2.84 times, and vLODs of three strips based on the quantitative fluorescence analysis were also increased by up to one orders of magnitude. The test results of five clinical serum samples indicated that three multi-channel LFIA strips could quantitatively detect four biomarkers of chest pain, and successfully distinguish AMI patients from AAD patients. These results indicated that this set of multi-channel LFIA strips could become an effective tool for the early and accurate detection or distinguish of ADD and AMI.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Qing-rui Zeng,Zi-ang Jia,Xu Liu,Bo-wen Xiu,Jin-ping Cheng
The rational application of piezoelectric polarization properties in non-centrosymmetric heterojunctions to improve charge separation efficiency is a novel approach for enhancing their photoelectrocatalytic capabilities for environmental purification. Herein, a noval 1T-2H MoS 2 QDs/Y-NaBi(MoO 4 ) 2 multiple heterostructures with two types S-scheme heterojunctions was formed by multi-functional materials NaBi(MoO 4 ) 2 with Y 3+ ion-doping and multi-phase state (1T, 2H and 1T-2H) MoS 2 quantum dots multi-interface polarization engineering. Material characterization and DFT calculations revealed that 1T-2H MoS 2 QDs/Y-NaBi(MoO 4 ) 2 multiple heterostructures produce highly-efficient Bi-S-Mo(IV) and Mo(IV)-S-Mo(VI) charge-transfer channels induced by multi-interface polarization engineering. 1T-2H MoS 2 QDs/Y-NaBi(MoO 4 ) 2 heterostructures were developed as photoanodes using the pressed tablet stainless-steel mesh (PT-SSM) method, and demonstrated conspicuous piezoelectric-photoelectrocatalytic (PZ-PEC) efficiency (99.88% removal within 40 min) for the degradation of organic pollutant phosphodiesterase-5 inhibitor (PDE-5i) under visible light illumination, direct-current external bias and mechanical force. This work provides new insight for synergy and mechanism between piezoelectric effect and photoelectrocatalysis for environmental clean-up.
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