SENSORS AND ACTUATORS B-CHEMICAL
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2022
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IF 9.221
Kun Yu,Guangyao Zhang,Huining Chai,Lijun Qu,Dan Shan,Xueji Zhang
Metal−organic frameworks (MOFs) have emerged as promising materials for smart sensing and imaging applications. Here, a novel micron-biscuit Mn(III)-based porphyrinic MOF is synthesized with the modulation of 4,4′-biphenyldicarboxylic acid (BPDC). The anisotropic growth of MOF is induced by the increased steric hindrance , yielding micron-biscuit Mn-TCPP(BPDC) MOF crystals. Mn(III), as a sealer, quenched the intrinsic fluorescence of porphyrin because of the ligand-to-metal charge transfer (LMCT) effect, and this disappeared fluorescence can be regularly restored and enhanced due to LMCT effect inhibition and release of free porphyrin derived from the water-induced two-stage ligand exchange (TSLE) between BPDC, porphyrin and water. The as-prepared MOF acts as an excellent “signal-on” luminescent water-sensing probe with low amount (2.5 μg/mL) that can efficiently realize the trace detection of water in various organic media with high sensitivity, especially in dimethyl sulfoxide (DMSO), the detection limit is as low as 0.04% (v/v). Moreover, Mn-TCPP(BPDC) was successfully used for sensing water content in real commercial samples. This MOF with the guest-induced TSLE not only provides inspiration for the design of new luminescent materials, but also widens the path for smart sensing.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2019
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IF 6.35
Long Yu,Qutong Zheng,Heng Wang,Chenxi Liu,Xiaoqing Huang,Yuxiu Xiao
Water is one of the most widespread impurities and contaminants for pharmaceuticals and chemical products. A simple, fast and reliable water assay method is of high significance for the pharmaceutical and chemical manufacturing industries. In this work, lanthanide metal–organic framework Eu-dipicolinic acid/2-aminophthalic acid (Eu-DPA/PTA-NH2) was prepared as a double-color ratiometric fluorescent water sensor, which shows ultrasensitive (limit of detection 0.01% v/v) and linear broad-range (0–100% v/v) response to water. An innovative analytical device based on a one-to-two logic gate was constructed by using the water content and the two fluorescence responses as the input and output signals, respectively. The direct analysis of water content can be achieved by the four output types, NOT (0, 1), PASS 0 (0, 0), PASS 1 (1, 1), and YES (1, 0). Importantly, the metal–organic framework (MOF)-loaded fiber paper was prepared as a microsensor, and a water assay tube was designed for rapid water detection of solid pharmaceuticals via ratiometric chromaticity, coupled with a portable visual determination device. The paper-based microsensor is response-rapid (20 s), long-term stable (at least 30 days), and can achieve the accurate (relative error <9.8%) visual assay of trace water in solid pharmaceuticals. To our knowledge, this is the first time to report an MOF-based double-color ratiometric fluorescent water sensor, a water analytical logic device, and a paper-based water microsensor for point-of-care visual water assay in solid samples via ratiometric chromaticity.
研究领域:
材料科学
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分析化学
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药物分析
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
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2021
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IF 5.097
Yujuan Qin,Yongju Bai,Pengcheng Huang,Fang-Ying Wu
We synthesized blue fluorescent carbon quantum dots (CDs) by the solvothermal strategy using 2,5-dihydroxyterephthalic acid as the precursor. The as-prepared CD surfaces contain abundant carboxyl and hydroxyl groups and show excitation-independent emission and excellent chemical stability. Interestingly, with the increment of water contents in organic solvents, the CDs underwent a visual fluorescence color transition from blue to green, which could be attributed to the excited-state intramolecular proton transfer effect via the intermolecular hydrogen bonding between CDs and water. Based on this, we designed an effective ratiometric fluorescence water sensor in organic solvents, which featured self-calibration, visualization, rapid response (<20 s), and high sensitivity (limit of detection = 0.052%, v/v, in ethanol). The smartphone-based quantitative assay was also realized using CD-loaded paper strips through a color processing application and successfully applied to monitor the water content in spirit samples. Humidity sensing was further evaluated through the as-prepared CDs/polymer films. Remarkably, the CD-based sensors were well recyclable both with paper strips and polymer films. The as-prepared CDs also hold great potential for anticounterfeiting.
研究领域:
材料科学
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分析化学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yongsheng Yang,Siyuan Tang,Da Chen,Changxing Wang,Bingli Gu,Xiameng Li,Feng Xie,Gang Wang,Qinglei Guo
In this study, red-emission graphene quantum dots (R-GQDs), with tunable emission wavelength , are synthesized and explored for applications in trace water sensing, white light emitting diodes (WLEDs) and information encryption . Systematic experiments and characterizations demonstrate that the as-fabricated R-GQDs possess homogeneous size, good crystallinity and high doping concentration of nitrogen and oxygen. Moreover, tunable multicolor light emissions of R-GQDs are demonstrated by simply adjusting the polarity of surrounding solvents. As a result, solid-state fluorescence films are successfully fabricated to construct a high-quality WLED, with the CIE (Commission International d′Eclairage) coordinates (0.352, 0.380) and color temperature of 5121 K. Besides, the water quenchable fluorescence of R-GQDs enables the fabrication of a trace water sensing platform, with the low detection limit of 0.034%. Finally, the potential of our prepared R-GQDs for the application in color visual information encryption is developed. This study may pave the way for the development of GQDs, especially in optically sensing, optoelectronics and anti-counterfeiting technology.
研究领域:
纳米材料学
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光学传感
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光电子学
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分析化学
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防伪技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）