MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Yue Zhang,Gang Li,Qiuyu Guo
A series of composites based on Fe-based MOF (Fe-BDC) and CdSe quantum dots (CdSe QDs) have been synthesized with CdSe QDs well-embedded into Fe-BDC particles, which are characterized by XRD , SEM, TEM, ICP-OES, FT-IR, N 2 physical sorption , UV–visible DRS , PL and electrochemical measurements. By detecting the degradation of Rhodamine B (RhB) in aqueous solution under visible light irradiation, the photocatalytic performance of CdSe@Fe-BDC nanocomposites were apparently improved by 5.8 times relative to single Fe-BDC, which can be attributed to the heterostructure formed in CdSe@Fe-BDC. Owing to the perfect interfacial contact, this promotes electron transfer from CdSe to Fe-BDC and significantly facilitates the separation of the photogenerated electron-hole pairs. The photocatalytic mechanism studied by adding sacrificial agents revealed that the predominant active species in the system is hole cation (h + ) and oxygen free radicals (•O 2 − ).
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
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.9
Jixia Tang,Yanan Liu,Chenhao Xu,Leping Li,Jia Guo,Jinlian Bi,Wei Li,Lei Zheng,Yujie Yuan
Blue-light synapses have garnered significant attention owing to their potential application value in neuromorphic systems for myopia prevention, control, and the further mitigation of visual trauma. However, existing devices fail to meet neuromorphic application demands for optoelectronic performance and adaptive visual behaviors because of a complex fabrication process and limited blue-light-dependence eye-inspired function. Here, using an optimized microfluidic technology for perovskite quantum dots (QDs) with mild batch manufacturing process and high reproducibility, we developed a MoS 2 /CsPbBr 3 -based synaptic device integrating photo-sensing, memory, and adaptive visual computing capabilities. This was attributed to high blue-light collection efficiency and self-regulated charge transport in the heterostructure, enhancing photosensitivity ( P ) by 9700 times and detectivity ( D* ) by 22 times compared to the pristine 2D-based device, while successfully emulating key biological synaptic behaviors such as paired-pulse facilitation/depression (PPF/PPD) and long-term potentiation/depression (LTP/LTD). Moreover, the developed hybrid device achieved 92% recognition accuracy, compared to 20% for pristine devices, and possessed image pre-processing capabilities for noise reduction and contrast enhancement due to its differential response to varying blue-light pulse densities. The study present a simple method for fabricating optoelectronic synapses, promoting the integration of 2D semiconductors into artificial neural visual systems.
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DOI
高影响因子
JOURNAL OF CRYSTAL GROWTH
·
2021
·
IF 1.797
Decao Ma,Lei Wang,Peiran Tong,Yanyan Zhang,Xin Jiang,Hengbin Mao,Tingting Xu,Bingbing Fan,Gang Shao,Wen Liu,Mingliang Li,Jinpeng Zhu,Hailong Wang,Hongliang Xu,Rui Zhang,Hongxia Lu
CsPbX 3 (X = Cl, Br, I) all-inorganic perovskite quantum dots have attracted extensive attention from researchers recently. However, the further development is confined by serious stability problems. In this work, the CsPbBr 3 QDs@SiO 2 /EVA films were prepared by supersaturated recrystallization, and SEM, EDS, XRD, FT-IR and PL were used to study microstructure, phase composition, and optical properties. Results show that during the preparation process, the amounts of precursor added would affect the fluorescence emission intensity of materials. The preparation method of films is simple, easy to operate, low cost, and beneficial to commercial large-scale production. In a typical synthesis, PbBr 2 and CsBr are dissolved in DMF, and then oleic acid (OA) and oleylamine (OAm) as ligands are added to stabilize the DMF−PbBr 2 −CsBr precursor solution. When the addition of TEOS is 0.06 mL, the PL peak strength of prepared films is higher and the thickness of CsPbBr 3 QDs@SiO 2 /EVA films is about 100 μm and flexible enough to be bent. At room temperature, the retention of fluorescence intensity of films is 67.4% after 30 d in the air, the retention is 63.6% after 40 h in the water, and the retention is 72.1% after 40 h under the UV light. EVA resins and SiO 2 coating can effectively isolate the contact between quantum dots and moisture and delay the intrusion of oxygen, which significantly improves the stability of pure quantum dots.
研究领域:
材料科学
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光学
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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
·
2020
·Vol. 31
·期 22
·19797-19808
·
IF 2.22
Wang Peng,Xu Shiyu,Wang Jiayu,Liu Xuezheng
Photocatalysis technology has received much attention on the treatment of antibiotics residues. In this paper, CdS quantum dots (QDs)-decorated TiO 2 (CDS-T for short) have been prepared successfully through a photodeposition method and utilized as photocatalysts for degradation of metronidazole (MTZ). Under visible light irradiation for 60 min, the degradation ratio of MTZ over CDS-T-3 that was prepared by 3 h of photodeposition reached up to 90.9%, which was 1.5 times than that reached over commercial CdS. The decoration of CdS QDs onto TiO 2 can enlarge light absorption range to visible region. Furthermore, greatly improved separation efficiency of photogenerated carriers is realized through forming heterojunction. Activity control experiments demonstrate that O 2 · − serve as the main active species, while ·OH and holes (h + ) play secondary roles on the MTZ degradation. Moreover, electron spin resonance (ESR) technique, terephthalic acid photoluminescence (TA-PL) technique and N,N-diethyl-p-phenylenediamine (DPD) method confirm that larger amounts of active species are generated from CDS-T-3 than that from commercial CdS under visible light. This study can not only offer an easy method to prepare CdS quantum dots-decorated TiO 2 but also enlarge its application in solving the problem of metronidazole contamination.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
IET Nanobiotechnology
·
2019
·Vol. 13
·期 6
·640-649
·
IF 1.925
Wanxia Wang,Youyun Wang,Yu Wang,Huameng Gong,Hongda Zhu,Mingxing Liu
New drug delivery system (ZnO@CMS) of the redox and pH dual-stimuli responsive based on colloidal mesoporous silica nanoparticles (CMS) has been designed, in which zinc oxide quantum dots (ZnO QDs) as a capping agent was conjugated on the surface of nanoparticles by amide bonds. The release behaviour of doxorubicin (DOX) as the model drug from ZnO@CMS (ZnO@CMS-DOX) indicated the redox and pH dual-stimuli responsive properties due to the acidic dissolution of ZnO QDs and cleavage of the disulphide bonds. The haemolysis and bovine serum albumin adsorption assays showed that the modification of ZnO QDs on the mesoporous silica nanoparticles modified by mercapto groups (CMS-SH)(ZnO@CMS) had better biocompatibility compared to CMS-SH. The cell viability and cellular uptake tests revealed that the ZnO@CMS might achieve the antitumour effect on cancer cells due to the cytotoxicity of ZnO QDs. Therefore, ZnO@CMS might be potential nanocarriers of the drug delivery system in cancer therapy. The in vivo evaluation of ZnO@CMS would be carried out in future work.
研究领域:
生物医学工程
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纳米医学
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药剂学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Ying Liang,Mingqian Wang,Zhicheng Zhang,Guohong Ren,Yajun Liu,Shishan Wu,Jian Shen
We have constructed biocompatible antibacterial nanoplatforms on the basis of a hybrid hydrogel via simple electrostatic interaction embedded with thin layer graphene oxide (GO) sheets modified with zinc oxide quantum dots (ZnO QDs). The materials possess favorable antibacterial efficacy, thereby providing excellent killing effect for Escherichia coli (Gram-negative) and Staphylococcus aureus (Gram-positive) compared with materials that have single diagnosis and treatment mode. The excellent performance stems from the combined effects of hyperthermia produced under the near-infrared irradiation of GO sheets, reactive oxygen species, the release of Zn 2+ from ZnO QDs under acidic environment, and the antibacterial activity of hydrogel. The synergy of antibacterial nanoplatforms can be used for wound anti-inflammatory in vivo indicated by the wound healing results. The hybrid hydrogel causes no evident side effects to major organs in mice during wound healing. Therefore, the biocompatible multimodal therapeutic nanoplatforms have great potential for antibacterial activity and wound healing.
研究领域:
生物医学工程
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材料科学
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微生物学
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DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 190
·期 1
·1-9
·
IF 6.408
Fan Yunfeng,Liu Zhimin,Wang Jie,Cui Chen,Hu Leqian
A novel electrochemiluminescence (ECL) aptasensor for the determination of lincomycin (LIN) was developed based on CdS QDs/carboxylated g-C 3 N 4 (CdS QDs/C-g-C 3 N 4 ). CdS QDs/C-g-C 3 N 4 served as the substrate of the aptasensor, and then CdS QDs/C-g-C 3 N 4 -modified electrode was incubated with aptamer DNA (Apt-DNA). When the non-specific sites of the electrode surface was blocked by 6-mercaptohexanol, the ferrocene-labeled probe (Fer-DNA) was assembled onto the electrode surface through base complementation with Apt-DNA. In the absence of LIN, the ECL signal was quenched effectively by Fer-DNA and a decreased ECL emission (off state) was acquired. On the contrary, LIN was specifically bond with Apt-DNA, and Fer-DNA was detached from the aptasensor surface because of the deformation of Apt-DNA, resulting in an effectively enhanced ECL signal (on state). The constructed ECL aptasensor exhibited a wide detection range for LIN determination (0.05 ng mL −1 –100 μg mL −1 ) with a low detection limit (0.02 ng mL −1 ). Importantly, the proposed ECL aptasensor showed outstanding accuracy and specificity for LIN determination, and also provided a potential strategy for other antibiotic determinations. Graphical Abstract
研究领域:
分析化学
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生物传感
·
药物检测
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DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 12
·127515
·
IF 4.386
Wenrui Zhao,Beibei Wang,Xueping Ji,Kai Kang,Bing Wang,Lin Wang,Jujie Ren
Herein, a novel electrochemiluminescence (ECL) sensor was developed using a dual signal amplification mechanism based on a typical HKUST-1 metal-organic framework, [Cu3(BTC)2(H2O)3, BTC=1,3,5-benzene tricarboxylate], CdS quantum dots (QDs) and multi-walled carbon nanotubes (MWCNTs) for ultrasensitive determination of catechol. HKUST-1 not only has a dispersion effect to carry more CdS QDs for enhancing stability, but also acts as effective catalyzer to accelerate the transformation of persulfate ion (S2O82−) for generating more sulfate radical anions (SO4•−), therefore amplifying the signal of the ECL sensor. Meanwhile, the introduction of MWCNTs to the ECL process could promote the electron transfer rate and accelerate the kinetics of the electro-catalytic reaction attributing to its stronger conductivity, achieving dual-amplifying effect, which could obviously increase the sensitivity of the ECL sensor. The proposed sensor displayed a wide linear range of 1 × 10−7 − 1 × 10−3 M and a low detection limit of 3.8 × 10−8 M with excellent stability, high repeatability and outstanding anti-interference ability under the optimal conditions. Impressively, the sensor possessed commendable feedback when detecting catechol in real samples. Therefore, this research provided a new strategy combining the advantages of MOFs, QDs and MWCNTs materials for phenolic pollutants detection.
研究领域:
分析化学
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环境科学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Shuo Geng,Shu Min Lin,Shi Gang Liu,Wei Zhang,Nian Bing Li,Hong Qun Luo
We synthesized polyethyleneimine capped ZnO quantum dots (PEI-ZnO QDs) which dispersed well in ethanol by using a two-step method. UV–visible absorption spectroscopy, photoluminescence, Fourier transform infrared spectroscopy, high resolution transmission electron microscope, and field emission scanning electron microscope were used to characterize the as-prepared PEI-ZnO QDs. It emitted green-yellow fluorescence (527 nm) for excitation at 355 nm. We used the PEI-ZnO QDs to determine the alcoholic strength because of its different property in water and ethanol which caused decrease in the PEI-ZnO QDs fluorescence intensity with increasing water content. With this method, we determined the alcoholic strength of different artificial samples with a linear range from 20% to 60% vol and detected commercial spirits with satisfactory results.
研究领域:
化学
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Jing Zhang,Guangyu Hao,Chenfei Yao,Jiani Yu,Jun Wang,Weitao Yang,Chunhong Hu,Bingbo Zhang
Bimodal imaging has captured increasing interests due to its complementary characteristics of two kinds of imaging modalities. Among the various dual-modal imaging techniques, MR/fluorescence imaging has been widely studied owing to its high 3D resolution and sensitivity. There is, however, still a strong demand to construct biocompatible MR/fluorescence contrast agents with near-infrared (NIR) fluorescent emissions and high relaxivities. In this study, BSA-DTPAGd derived from bovine serum albumin (BSA) as a novel kind of biotemplate is employed for biomineralization of paramagnetic NIR Ag2S quantum dots (denoted as Ag2S@BSA-DTPAGd pQDs). This synthetic strategy is found to be bioinspired, environmentally benign, and straightforward. The obtained Ag2S@BSA-DTPAGd pQDs have fine sizes (ca. 6 nm) and good colloidal stability. They exhibit unabated NIR fluorescent emission (ca. 790 nm) as well as high longitudinal relaxivity (r1 = 12.6 mM–1 s–1) compared to that of commercial Magnevist (r1 = 3.13 mM–1 s–1). In vivo tumor-bearing MR and fluorescence imaging both demonstrate that Ag2S@BSA-DTPAGd pQDs have pronounced tiny tumor targeting capability. In vitro and in vivo toxicity study show Ag2S@BSA-DTPAGd pQDs are biocompatible. Also, biodistribution analysis indicates they can be cleared from body mainly via liver metabolism. This protein-mediated biomineralized Ag2S@BSA-DTPAGd pQDs presents great potential as a novel bimodal imaging contrast agent for tiny tumor diagnosis.
研究领域:
生物医学工程
·
材料科学
·
纳米技术
·
医学成像
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 78
·49330-49336
·
IF 3.108
Jian Cui,Tianjiao Liu,Dapeng Liang,Jiale Liu,Kai Zhang,Bai Yang,Yang Ning
Traditional fluorescent probe detection is an established technique for enhancing or quenching luminescence intensity; however, a color changeable fluorescent material is still a challenge in many target detection fields. Herein, a dual-emission quantum dots (QDs)/polymer carbon dots (PCDs) assembled composite nanoparticle was prepared via a simple self-assembly method. By choosing the QDs and PCDs source, the luminescence color of the composite nanoparticles can be controlled all over the visible light spectrum. The composite material possesses high sensitivity and selectivity with Hg2+; with increasing concentration of Hg2+, the luminescence color of the composite material changes from pink to violet, and at last blue. The detection limit of Hg2+ was 10 nM by luminescence spectrum, and 100 nM by visual observation, so it may be utilized for visual detection in environmental science and biology.
研究领域:
环境科学
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生物化学
·
材料科学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Rong Wang,Xiangyu Kong,Wentao Zhang,Wenxin Zhu,Lunjie Huang,Jing Wang,Xu Zhang,Xinnan Liu,Na Hu,Yourui Suo,Jianlong Wang
Photocatalytic disinfection, which is a readily reliable method in most climates, holds great promise to significantly reduce the microbial contamination in modern industry. Here we report that vanadate quantum dots-interspersed graphitic carbon nitride (vanadate QDs/g-C 3 N 4 ) can achieve efficient inactivation of Salmonella by harvesting a substantial visible light. Detailed characterization through SEM-EDS, TEM, XRD, FT-IR, and XPS confirmed the formation of the composites. Owing to the efficient reactive oxygen species (ROS) production between vanadate QDs and g-C 3 N 4 , the bactericidal efficiency of AgVO 3 QDs/g-C 3 N 4 could reach 96.4% toward Salmonella in a concentration of 0.75 mg/mL after 10 min visible-light illumination. More importantly, scavenger experiments of different reactive species proved that the photoinduced electron generated at the oxidation site of AgVO 3 /g-C 3 N 4 play a major role as oxidative species. Fluorescent-based cell live/dead test and membrane potentials were applied to demonstrate the integrity of cell membranes. Furthermore, the SEM technology, PCR and BCA protein assay were employed to verify the bacterial decomposition as well as leakage of bacterial cell contents toward Salmonella . Sterilization experiments of Staphylococcus aureus revealed that our composites have broad spectrum antimicrobial activity for both Gram-negative and Gram-positive bacteria under visible light. The results showed that the generation of high ROS could attack the bacterial cells membrane, and ultimately disrupt the cell metabolism through bacterial contents, which provided a feasible method for eliminating the microbial contaminated water.
研究领域:
环境科学
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材料科学
·
微生物学
·
光化学
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产品关联
DOI
高影响因子
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