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相关概念视频

Infrared (IR) Spectroscopy: Overview01:09

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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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IR Frequency Region: Fingerprint Region01:03

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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IR Spectrum01:19

IR Spectrum

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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基于相变材料的可见光兼容红外隐形能力.

Zhou Ai1, Huafeng Zhang1, Shubo Cheng1

  • 1School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei 434023, China. hfzhang@yangtzeu.edu.cn.

Dalton transactions (Cambridge, England : 2003)
|May 6, 2025
PubMed
概括
此摘要是机器生成的。

本研究设计了微纳米结构,使用热色相变材料,二氧化瓦纳 (VO2) 和-- telluride (GST),用于可调节的热发射和隐形能力在可见和红外光谱. 该研究优化了材料厚度和层次,以控制先进隐形技术的排放性.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 光学是什么?光学是什么?

背景情况:

  • 控制热排放对于隐形应用至关重要.
  • 热色相变材料 (PCM),如VO2和GST提供可调节的光学特性.
  • 设计微纳米结构可以提高在不同波长的隐形性能.

研究的目的:

  • 设计和研究具有可调节温度的热辐射的微纳米结构.
  • 在可见光和红外背景中使用PCM控制隐形效应.
  • 通过红外发射率操纵来探索可见光隐形的可行性.

主要方法:

  • 利用-- telluride (GST) 来创建一个初始的红外隐形结构,探索它的无形 (aGST) 和晶体 (cGST) 状态.
  • 加入了一层硫化 (ZnS) 层来调节结构颜色,并研究了可调节发射率的最佳厚度.
  • 添加了二氧化瓦纳 (VO2) 层,以引入四个不同的状态,由于其可逆相变,分析红外发射率变化.

主要成果:

  • 优化GST厚度为250nm,在大气窗口 (3-5μm和8-14μm) 中实现低排放,以实现红外隐形.
  • 在5-8μm窗口中证明可调节的发射率,以优化隐形效应 (减少热损失或辐射).
  • 确定了可见光隐形的最佳 ZnS 层厚度 (150 nm),并证实了 GST 和 ZnS 层组合的低红外发射率.

结论:

  • 结合GST和VO2的动态调节的微纳米结构可以精确控制反射和发射特征.
  • 设计的结构在可见和红外频段提供了增强的隐形能力.
  • 这项研究通过工程化相变材料为先进的隐形技术提供了新的可能性.