ACS Applied Optical Materials
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2024
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IF 0
Zhiwei Wang,Qiuying Wang,Qin Liu,Suwit Suthirakun,Wongsathorn Kaewraung,Peng Jiang,Hang Zhao,Xin Xin,M. A. Subramanian
Blue pigments and blue glazes play crucial roles in our daily life. Ongoing research into blue pigments aims at environmentally friendly compositions with a lower cost. In this work, Co-doped BaAl2Si2O8 pigments were synthesized by a solid-state method. The blue color of the pigments is due to the 4A2(4F) → 4T1(4P) transitions allowed by doped Co2+ in the tetrahedral coordination of the structure. The pigments exhibit excellent stability under both acidic and alkaline conditions. When combined with transparent glazes, BaAl2–xCoxSi2O8 demonstrates satisfied compatibility, resulting in blue glazes with a significant reduction in Co content compared with existing formulations. Furthermore, BaAl2–xCoxSi2O8 blue glazes possess a simple production route, commendable color performance, and cost-effectiveness.
研究领域:
材料科学
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无机化学
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环境科学
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DOI
MATERIALS RESEARCH BULLETIN
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2019
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IF 3.355
Zhen Cao,Ji Li,Li Wang,Ke Xing,Xi Yuan,Jialong Zhao,Xin Gao,Haibo Li
In this work, the effects of Co 2+ ions on the structural and luminescent properties of intrinsic and Mn doped CsPbCl 3 NCs were studied by using photoluminescence (PL) spectroscopy, X-ray diffraction (XRD) spectroscopy, and transmission electron microscopy (TEM). The undoped and Mn doped CsPbCl 3 NCs with various Co/Pb molar ratios were synthesized at 190 °C. It was found that the quantum yields of purple emissions in these CsPbCl 3 NCs were greatly enhanced up to 30% after Co 2+ ions were doped. The diffraction peaks in XRD patterns shifted to a large angle with the increase of Co/Pb molar ratio, indicating Co doping in Pb-site. Further both intrinsic and Mn doped CsPbCl 3 NCs exhibited uniform cubes with average sizes of 8–10 nm and good crystallinity after Co doping. The enhancement of purple emissions from excitons in the CsPbCl 3 NCs was related to the reduction of nonradiative defects in these NCs through Co 2+ doping.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
BIOMATERIALS
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2014
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IF 8.312
Ao Xia,Xiaofeng Zhang,Jun Zhang,Yunyun Deng,Qiang Chen,Shishan Wu,Xiaohua Huang,Jian Shen
Dual-modality imaging with magnetic resonance (MR) and upconversion luminescence (UCL) is a promising technique for molecular imaging in biomedical research. Multifunctional lanthanide-based nanoparticles have been widely investigated as agents for contrast enhanced MR and fluorescence imaging. However, the use of rare earth fluoride nanoparticles for dual-modality imaging of T2-weighted MR and UCL is rarely reported. We find that NaYF 4 :Yb 3+ ,Tm 3+ ,Co 2+ (MUC) nanorods can be applied as a high-performance dual contrast agent for both T2-weighted MR and UCL dual-modality imaging. After modification with 6-O-carboxymethyl chitosan (OCC), MUC nanorods can be endocytosed by cells without showing signs of cytotoxicity. High-quality UCL images of living cells incubated with MUC-OCC nanorods were acquired on a near-infrared (NIR) confocal microscopy under the excitation at 980 nm. Moreover, MUC-OCC nanorods display high transverse (r2) relaxivities in vitro . The application of low-dose MUC-OCC nanorods for NIR-to-NIR UCL and MR dual-modality in vivo imaging was also carried out successfully. In addition, the toxicity of MUC-OCC nanorods was evaluated by MTT assay , serological tests and histological analysis of visceral organs.
研究领域:
生物医学工程
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分子影像学
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纳米医学
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产品关联
DOI
PubMed
高影响因子
ChemElectroChem
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2022
·Vol. 9
·期 15
·e202200522
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IF 4.782
Liying Ming,Xiao-Yuan Wu,Sa-Sa Wang,Weiming Wu,Can-Zhong Lu
Graphical Methanol to formate : Selective electrooxidation of methanol for the production of formate with high Faradic efficiency was easily implemented in a two-electrode configuration at high current densities, in which Co 2+ -doped Ni(OH) 2 nanosheets were facilely grown on Ni foam and were used as efficient porous electrodes. Co 2+ -doped Ni(OH) 2 nanosheets were grown on porous Ni foam by a simple electrodeposition method. The obtained samples were used as porous electrodes for selective electrocatalytic oxidation of methanol to formate in NaOH aqueous solution. The results indicated the oxidizing abilities of the as-prepared electrodes could be regulated by the doping content of Co 2+ for the electrooxidation of methanol, in which the electrode with a Co 2+ doping content of 10 mol % required a lowest potential of ∼1.32 V vs . RHE to achieve a current density of 100 mA cm −2 as compared with other electrodes. And the doping of Co 2+ helped boosting the Faradic efficiency for the electrocatalytic oxidation of methanol. Moreover, the electrooxidation of methanol for the production of formate (Faradic efficiency ≥96.5 %) with the simultaneous generation of hydrogen was easily implemented in a two-electrode configuration at high current densities (100–500 mA cm −2 ). The results of the durability test further revealed that the 10 mol % Co 2+ -doped Ni(OH) 2 electrode exhibited an outstanding stability for the electrocatalytic oxidation of methanol in the present system.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
BIOSENSORS & BIOELECTRONICS
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2019
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IF 9.518
Xuwen Gao,Kena Fu,Li Fu,Huaisheng Wang,Bin Zhang,Guizheng Zou
Novel optical labels for biosensing in near-infrared (NIR) region (especially between 800 and 900 nm) are arousing much attention for higher penetrating capability, less scattering and lowered autofluorescent background. Herein, a water-soluble electrochemiluminophore with effective electrochemiluminescence (ECL) around 815 nm is developed via doping dual-stabilizers-capped CdTe nanocrystals (NCs) with Co 2+ species in a growth-doping way. The Co 2+ -doped CdTe NCs not only can preserve the highly-passivated surface states of dual-stabilizers-capped CdTe NCs, but also exhibit efficient red-shifted photoluminescence (PL) and ECL into the promising optical NIR window of 800–900 nm. A spectrum-based ultrasensitive NIR ECL immunosensor is consequently fabricated with the Co 2+ -doped CdTe NCs as tags for the first time, which can selectively and sensitively determine human carcinoembryonic antigen with a wide linearity range from 1 fg/mL to 10 pg/mL and a low limit of detection at 0.2 fg/mL (S/N = 3). This work opens a way to screen novel NIR electrochemiluminophore as well as to modulate the ECL performance of NCs via surface doping and engineering.
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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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Jiayi Qin,Jia Su,Hong Li,Ling Zhang,Ling Zhang,Ke Jiang
The development of novel antibacterial strategies as alternatives to antibiotics is of great significance but remains considerable challenges due to the lack of safe, effective, and broad-spectrum agents. Here, we explored the potential of a biocompatible metal–organic framework Fe-MIL-53-NH 2 (FM) for reactive oxygen species (ROS)-based antibacterial applications. However, FM was found to be catalytically inert due to the very weak reducibility of Fe 3+ toward H 2 O 2 . To address this challenge, we incorporated a small amount of Co 2+ (0.98 %) into FM (CFM), successfully activating Fenton chemistry and achieving a notable 5.5-fold improvement in Fenton activity. Density functional theory (DFT) calculations revealed that a very small amount of Co 2+ doping significantly reduces the energy barrier of the Fenton reaction by shifting the d-band center to the Fermi level and optimizing the charge density of active Co atoms. We further enhanced the antibacterial properties of CFM by modifying it with the photothermal agent polydopamine (PDA), resulting in CFMP. Through the synergistic effects of ROS and photothermal properties, CFMP exhibited remarkable antibacterial activity, with bacterial eradication rates exceeding 99 % against both E. coli and S. aureus . Moreover, in vivo experiments demonstrated the exceptional efficacy of CFMP in sterilizing S. aureus -infected wounds, while causing negligible damage to other major organs. This study not only highlights the role of atom engineering in activating Fenton reaction, but also provides rational designs for a synergistic antibacterial strategy via powerful MOFs chemistry.
研究领域:
材料科学
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纳米技术
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生物医学工程
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化学
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微生物学
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产品关联
DOI
高影响因子
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