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相关概念视频

Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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Atomic Fluorescence Spectroscopy01:29

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Photoluminescence: Fluorescence and Phosphorescence01:23

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Updated: Jul 11, 2025

Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
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光终身成像用于爆炸物检测.

Andrew B Matheson, Edward B Ogugu, Ross N Gillanders

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    此摘要是机器生成的。

    这项研究引入了一种新的传感器,用于使用有机半导体薄膜检测爆炸性蒸汽. 该系统提供了更好的空间和时间分辨率,用于加强安全和除雷应用中的化学物质检测.

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    科学领域:

    • 材料科学 材料科学 材料科学
    • 传感器技术 传感器技术
    • 分析化学 分析化学

    背景情况:

    • 现有的爆炸性蒸汽检测系统往往缺乏集成的空间和时间分辨率.
    • 监测光强度和寿命对于准确的化学识别至关重要.
    • 以前的方法通常提供空间或时间信息,但不能同时提供两者.

    研究的目的:

    • 开发一种用于检测具有高空间和时间分辨率的爆炸性蒸汽的新型传感器系统.
    • 使用单光子雪崩二极管 (SPAD) 传感器阵列与有机半导体薄膜相结合.
    • 为了实现光强度和寿命的像素对像素监控,以改善化学指纹.

    主要方法:

    • 使用一个具有时间分辨率的120 × 128像素的SPAD传感器.
    • 一系列有机半导体薄膜被安排在一个2 × 2网格.
    • 传感器的空间和时间分辨率允许在每像素的基础上监测光强度和寿命.

    主要成果:

    • 该系统成功检测到DNT (2,4-丁二) 的蒸气.
    • 对于四种聚合物薄膜中的每一种,都观察到不同的反应,这表明选择性检测.
    • 该传感器展示了空间分辨率光寿命成像的能力.

    结论:

    • 开发的传感器系统通过整合空间和时间分辨率,比以前的技术有了显著的进步.
    • 这项技术在创建便携式化学指纹工具方面具有很大的潜力.
    • 应用包括安全查和人道主义扫雷工作,用于爆炸物检测.