ANALYTICAL CHEMISTRY
·
2011
·
IF 5.874
Hu-Bo Ren,Bo-Yue Wu,Jia-Tong Chen,Xiu-Ping Yan
Detection of intracellular Zn2+ has gained great attention because of its biological significances. Here we show the fabrication of silica-coated S2–-enriched Mn-doped ZnS quantum dots (SiO2–S–Mn–ZnS QDs) by enriching S2– with a silica shell on the surface of Mn-doped ZnS QDs via a sol–gel process for imaging intracellular Zn2+ ions. The developed probe gave a good linearity for the calibration plot (the recovered PL intensity of the SiO2–S–Mn–ZnS QDs against the concentration of Zn2+ from 0.3 to 15.0 μM), excellent reproducibility (1.2% relative standard deviation for 11 replicate measurements of Zn2+ at 3 μM), and low detection limit (3s; 80 nM Zn2+). The SiO2–S–Mn–ZnS QDs showed negligible cytotoxicity, good sensitivity, and selectivity for Zn2+ in a photoluminescence turn-on mode, being a promising probe for photoluminescence imaging of intracellular Zn2+.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Xiaojiao Kang,Tianyu Gao,Wei Lü,Ming Jiang,Hongbo Zhu,Hongcheng Wang
Ternary I-III-VI quantum dots (QDs) are promising substitutions to Pb and Cd chalcogenide QDs in various applications such as LED, biodetection and sensing. It is urgent to explore near-infrared (NIR) emitting QDs with the advantages of low-cost synthesis and nontoxicity. Herein, water-soluble NIR Cu-In-S/ZnS (CIS/ZnS) QDs were obtained utilizing thioglycolic acid (TGA) and polyethyleneimine (PEI) as the stabilizing molecules in a commercial pressure cooker. Moreover, we detailedly investigated the influence factors on the PL property of CIS QDs and CIS/ZnS QDs including species of sulfur source, reaction time, pH, the dosage of TGA, PEI, Na 2 S, number of ZnS coating layers and the molar ratio of Cu/In. These QDs with adjusting Cu/In ratios show the emission maximum in the range of 710–750 nm. The maximum PL quantum yield (PLQY) of 20 % was acquired for CIS/ZnS QDs with a Cu/In ratio was 0.33/1 and three ZnS layer coating. Finally, we fabricated a NIR pc-LED lamp by using blue LED chips and CIS/ZnS QDs. The device shows a broadband NIR emission centered at 770 nm, which can be applied in night-vision system.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Hao Hao,Hui-Ling Hu,Yi Liu,Feng-Lei Jiang
In this work, CdSe/ZnS core/shell quantum dots (QDs) were synthesized. Dilution of the as-synthesized QDs would lead to instability with photoluminescence (PL) quenching. It was found that the addition of tertiary phosphine and alkylthiol could recover the PL intensity of diluted QDs and make these QDs stable. Specifically, the recovery efficiency of tertiary phosphine was stronger than that of alkylthiol. Trioctylphosphine (TOP) and octanethiol (OT) were chosen as the representative ligands, respectively. Isothermal titration calorimetry (ITC) demonstrated that interactions between both TOP/OT and QDs were exothermic and spontaneous. The interaction between TOP and QDs was mainly driven by van der Waals forces due to the branched structure. This interaction had a negative entropy change, while the interaction between OT and QDs had a positive entropy change. There were about ∼12 TOP molecules and ∼17 OT molecules bound to a QD particle. The binding constants of TOP/OT to QDs were 1.6 × 103 and 12.8 × 103 M–1, respectively. The reaction rate between TOP and QDs was fast, and the addition of OT could slow the reaction rate constant from 0.081 to 0.024 min–1. PL decay indicated that TOP and OT could increase the radiative recombination of excitons. Furthermore, both TOP and OT could greatly improve the brightness of the QD films, which was a prerequisite for the efficient improvement of quantum dot light-emitting diodes. This work explicitly investigated the dilution process of QDs, explored the methods for keeping diluted QDs stable and bright, and highlighted the importance of surface ligands.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2021
·
IF 4.464
Zhipeng Li,Shuo Wu,Guizheng Zou
Discriminating the electrochemiluminescence (ECL) of differed luminophores is crucial for ECL multiplexing. However, because of the limited potential window for ECL assay and the overlapped triggering-potential-range between different luminophores, the potential-resolved ECL multiplexing with good resolutions ( R s ) is still a great challenge. Herein, a single anodic ECL from two luminophores in the aqueous solution was discriminated completely (baseline separation, R s ≥ 1.5) in a potential-resolved way with the water-soluble CuInS 2 @ZnS ( [email protected] ) nanocrystals (NCs) and [Ru(bpy) 2 (dcbpy)] 2+ as luminophores and N 2 H 4 as the co-reactant. N 2 H 4 could be electrochemically oxidized to reducing radicals and then reacted with the electrochemically oxidized [email protected] NCs and [Ru(bpy) 2 (dcbpy)] 2+ in sequence to produce co-reactant ECL. The potential-resolved ECL of [email protected] NCs/N 2 H 4 and [Ru(bpy) 2 (dcbpy)] 2+ /N 2 H 4 could be well defined and distinguished from each other upon potential scanning ( R s = 2.60) and utilized for simultaneously determining human prostate specific antigen and carcinoma antigen 125 at the pathological cut-off concentration ( R s = 1.56).
研究领域:
分析化学
·
生物化学
·
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED TOXICOLOGY
·
2019
·Vol. 40
·期 3
·388-402
·
IF 3.065
Tianshu Wu,Keyu He,Xue Liang,Tingting Wei,Yan Wang,Lingyue Zou,Ting Zhang,Yuying Xue,Meng Tang
The excellent optical property and relatively low toxicity of CdTe/ZnS core/shell quantum dots (QDs) make them an advanced fluorescent probe in the application of biomedicines, particularly in neuroscience. Thus, it is important to evaluate the biosafety of CdTe/ZnS QDs on the central nervous system (CNS). Our previous studies have suggested that the high possibility of CdTe/ZnS QDs being transported into the brain across the blood-brain barrier resulted in microglial activation and a shift of glycometabolism, but their underlying mechanism remains unclear. In this study, when mice were injected intravenously with CdTe/ZnS QDs through tail veins, the microglial activation, polarized into both M1 phenotype and M2 phenotype, and the neuronal impairment were observed in the hippocampus. Meanwhile, the increased pro- and anti-inflammatory cytokines released from BV2 microglial cells treated with CdTe/ZnS QDs also indicated that QD exposure was capable of inducing microglial activation in vitro. We further demonstrated that the glycolytic shift from oxidative phosphorylation switching into aerobic glycolysis was required in the microglial activation into M1 phenotype induced by CdTe/ZnS QD treatment, which was mediated through the mTOR signaling pathway. The findings, taken together, provide a mechanistic insight regarding the CdTe/ZnS QDs inducing microglial activation and the role of the glycolytic shift in it.
研究领域:
神经科学
·
毒理学
·
细胞代谢
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
Laser & Photonics Reviews
·
2026
·
IF 10
Zhipeng Xu,Haoran Chen,Yue Liu,Xiang Zhou,Dechao Yu,Xiaobin Xie,Chunchao Hou,Bohua Dong,Lixin Cao,Chenghui Xia
Near-infrared-emitting copper-based I-III-VI quantum dots (QDs) hold significant promise for photonics and bioapplications, yet their broad photoluminescence (PL) emission severely limits color purity and device efficiency. Herein, we report a hierarchically staged synthesis that decouples and sequentially suppresses defect- and phonon-induced broadening. Starting with Zn-poor CuInSe 2 QDs via cation exchange, we introduce Zn 2+ alloying to passivate cation vacancies and homogenize composition, forming a defect-minimized core. Subsequent epitaxial overcoating with a thick ZnS shell strongly localizes excitons, evidenced by suppressed thermal quenching and dominant coupling to a higher-order longitudinal optical ( LO ) phonon mode of ZnS ( E LO ≈ 141 meV). This shifts recombination from defect-assisted to near-band-edge emission, yielding CuInZnSe/ZnS QDs with an ultranarrow linewidth of 111 meV, high PL quantum yield of 73%, and minimal Stokes shift of 42 meV at 977 nm. When integrated into luminescent solar concentrators, these QDs enable an optical efficiency of 8.81% and a power conversion efficiency of 2.79%, underscoring their practical utility. Beyond reporting materials, this work provides profound insights into the interplay of exciton confinement and defect engineering, establishing a general and instructive strategy for achieving high color purity in multinary QDs.
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2011
·Vol. 85
·期 4
·1738-1743
·
IF 3.722
Junling Duan,Xiaochen Jiang,Shouqing Ni,Min Yang,Jinhua Zhan
This paper described an investigation of a novel eco-friendly fluorescence sensor for Hg 2+ ions based on N-acetyl- l -cysteine (NAC)-capped ZnS quantum dots (QDs) in aqueous solution. By using safe and low-cost materials, ZnS QDs modified by NAC were easily synthesized in aqueous medium via a one-step method. The quantitative detection of Hg 2+ ions was developed based on fluorescence quenching of ZnS QDs with high sensitivity and selectivity . Under optimal conditions, its response was linearly proportional to the concentration of Hg 2+ ions in a range from 0 to 2.4 × 10 −6 mol L −1 with a detection limit of 5.0 × 10 −9 mol L −1 . Most of common physiologically relevant cations and anions did not interfere with the detection of Hg 2+ . The proposed method was applied to the trace determination of Hg 2+ ions in water samples. The possible quenching mechanism was also examined by fluorescence and UV–vis absorption spectra .
研究领域:
环境化学
·
分析化学
·
纳米材料
·
荧光传感
·
重金属检测
✓ 已验证
DOI
高影响因子
KOREAN JOURNAL OF CHEMICAL ENGINEERING
·
2022
·Vol. 39
·期 6
·1641-1650
·
IF 3.146
Ling Yang,Wu Jiang,Yang Lingtao,Liu Dongjing
The emission of mercury from anthropogenic activities is a serious concern in both developed and developing countries due to its high toxicity and persistence. Here, carbon nitride nanosheets (CNNS) were attained via a two-step thermal etching method and applied for Hg 0 removal. Proper deposition of ZnS can markedly reinforce the Hg 0 capture ability of CNNS. 10ZnS/CNNS notably outperforms ZnS and CNNS at 100 °C, which is primarily attributed to surface chemisorbed oxygen species and polysulfide active sites. Besides, Hg 0 adsorption and thermal catalytic oxidation pathways are further disclosed using quantum chemistry calculations based on density functional theory (DFT). The calculation results show that the presence of zinc species is beneficial to the decomposition of adsorbed oxygen, which plays a key role in the catalytic oxidation of Hg 0 , thereby contributing to the enhancement of mercury removal performance.
研究领域:
环境科学
·
材料化学
·
理论与计算化学
✓ 已验证
DOI
高影响因子
NANO
·
2026
·
IF 1.3
Mingjiao Hu,Yanlu Long,Xutao Ning,Bin Zeng
In this study, a novel ternary photocatalyst, composed of BiOCl, ZnS, and ZnO, was successfully prepared for the first time via a mixed method followed by thermal treatment, which possessed a dual Type-II heterojunction structure. This composite exhibited substantially boosted photocatalytic degradation efficiency toward tetracycline (TC) under simulated sunlight. The microstructure, crystal morphology, charge transfer properties, and optical absorption behavior of the composite were systematically characterized and analyzed. The results demonstrated that the dual type-II heterojunction formed among ZnS, ZnO, and BiOCl effectively broadened the light absorption range and promoted the separation of photogenerated carriers, thereby significantly enhancing the photocatalytic activity. Active species trapping experiments and ESR tests confirmed that ·OH and ·O 2 - were the main active species in this photocatalytic system. The degradation efficiency of TC by this ternary catalyst under visible light reached as high as 95.8%, and it still maintained excellent stability after five consecutive cycles. Band structure analysis further revealed the charge separation mechanism in the dual type-II heterojunction. This novel dual type-II heterojunction is expected to provide new insights into the efficient degradation of pharmaceutical pollutants.
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2022
·
IF 4.598
Yanyang Guo,Xianyang Li,Zhuqing Zhao,Jiakang Qu,Qiang Ma,Dihua Wang,Huayi Yin
The electrochemical desulfurization in the molten salt is a promising green route to extract metals directly from sulfide ores. However, less attention has been paid to the process of converting solid sulfides to liquid metals, especially the evolution of the solid sulfide/liquid metal interface. Herein, the electrochemical desulfurization process of converting solid ZnS to liquid Zn in NaCl-KCl was studied through electrochemical measurements, wettability test, and postmortem analysis of the electrolytic product. The continuous solid-to-liquid reaction in the molten salt is ascribed to the poor wettability of liquid Zn on the solid ZnS which prevents the liquid Zn from fully covering the sulfide surface and allows S 2- ions transfer. The desulfurization process consisted of three stages: two-step reduction of zinc sulfide and the reduction of Na + on the liquid Zn to form Na-Zn alloys. The understanding of the solid-to-liquid conversion process is helpful to understand various solid-to-liquid reactions so as to design efficient electrolyzers.
研究领域:
电化学
·
冶金工程
·
材料科学
·
无机化学
·
能源材料
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 46
·31634-31639
·
IF 4.449
Lan Wang,Xiaojiao Kang,Daocheng Pan
Flexible luminescent materials, with the advantages of foldability and crack resistance, have attracted extensive interest owing to their broad application in collapsible optoelectronic devices. In this work, highly luminescent water-soluble green and red AgInS2/ZnS core/shell quantum dots (QDs) are synthesized in an electric pressure cooker. Luminescent and flexible films are fabricated by combining QDs with polyvinyl alcohol (PVA), and the green and red QD/PVA films show a high photoluminescence quantum yield (PLQY) of about 55% and 64% upon 460 nm excitation, respectively. Finally, the green and red QD/PVA films are successfully applied on top of a conventional blue InGaN chip for remote-type warm-white LEDs. As-fabricated warm-white LEDs exhibit a higher color rendering index (CRI) of about 90.2 and a correlated color temperature (CCT) of 3698 K.
研究领域:
材料科学
·
纳米技术
·
光电子学
·
固态照明
✓ 已验证
DOI
高影响因子
NANOTECHNOLOGY
·
2022
·Vol. 33
·期 50
·505602
·
IF 3.953
Fan Fang,Haochen Liu,Zuoliang Wen,Chenxi Liu,Bing Xu,Zhikuan Zhang,Kai Wang,Mehmet Ertugrul,Wei Lei,Xiao Wei Sun
Colloidal quantum dots (QDs) are promising luminescent materials for display and lighting, but their stability has long been an issue. Here, we designed a passivation strategy of doping Ti ions into the shell of alloyed CdZnSeS@ZnS QDs. The results showed that Ti ions were successfully doped into the ZnS shell and the stability of QDs was improved. In the aging test, the Ti ions doped QDs maintained 51.4% of the initial performance after 90 h of aging, while the pristine QDs decreased to less than 25% of the initial value. In addition, we discuss the reasons why Ti ions doping improves the stability of QDs. Ti ions are found to form Ti–S bonds in the ZnS shell, which has high binding energy and strong oxidation resistance. Most importantly, since there is no external physical insulating coating, the optimized QDs can also be directly used in electroluminescent devices, showing great potential in electroluminescence applications.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）