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相关概念视频

Electrospray Ionization (ESI) Mass Spectrometry01:12

Electrospray Ionization (ESI) Mass Spectrometry

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Higher molecular weight biomolecules are nonvolatile compounds that may decompose before ionizing or vaporizing during mass analysis with conventional electron impact ionization methods. Accordingly, electrospray ionization (ESI) is the favored method for vaporizing and ionizing biomolecules as it circumvents rapid fragmentation and enables the recording of mass signals for the entire biomolecule.
ESI utilizes electrical energy to transfer ions from the liquid phase of the sample into the...
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Ion-Exchange Chromatography01:09

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Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
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Updated: May 3, 2026

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基于ESIPT的双向单分子光导体

Jin Qiu1, Shuyu Jiang1, Yutian Zhang1

  • 1Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China.

Journal of the American Chemical Society
|November 17, 2025
PubMed
概括

研究人员使用激发状态内质子转移 (ESIPT) 和量子干扰 (QI) 开发了新的单分子光导体. 这些分子在曝光时的导电率显著增加或减少,为先进的分子光电子铺平了道路.

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科学领域:

  • 分子电子
  • 光电子产品
  • 光导电性

背景情况:

  • 单分子光导体对于分子光电子非常重要.
  • 在单分子层面调节双向光导仍然是一个挑战.

研究的目的:

  • 设计具有可调节光导性的高性能单分子光导体.
  • 探索激发状态内质子转移 (ESIPT) 和量子干扰 (QI) 效应的相互作用.

主要方法:

  • 使用扫描道显微镜断裂结 (STM-BJ) 技术.
  • 研究了两个结构相关的2-基胺 (PPOH和PMOH).
  • 使用理论计算来了解潜在的机制.

主要成果:

  • 在单分子连接中实现了创纪录的光导度调制.
  • 在365nm辐射下,PPOH呈现逆光导率 (降低了120倍).
  • PMOH显示光导度增强 (增长1. 78倍),表明双向控制.
  • 确定ESIPT和QI效应是观察到光导变化的关键驱动因素.

结论:

  • 基于ESIPT和QI的单分子光导体的合理设计策略已建立.
  • 这项研究将宏观光导体行为与单个光响应分子联系起来.
  • 在光电子学中提供ESIPT驱动的QI效应的新分子设计范式.