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Related Concept Videos

UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

2.7K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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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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UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

8.2K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent of conjugation in...
8.2K
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

3.3K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Updated: Jan 13, 2026

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
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Ferroelectric Reconfigurable Homojunction Miniaturized Computational Spectrometers for Dynamic Spectral Sensing.

Qianru Zhao1,2, Binmin Wu1, Shuaiqin Wu1,2

  • 1State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai, China.

Advanced Materials (Deerfield Beach, Fla.)
|January 8, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a compact, low-power spectral sensing platform using a ferroelectric WSe2 homojunction for real-time analysis. It enables high-resolution spectral reconstruction and dynamic sensing with minimal energy consumption.

Keywords:
WSe2 homojunctiondynamic spectral sensingferroelectric reconfigurationminiaturized computational spectrometerspectral reconstruction

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Traditional spectrometers face limitations in size, energy efficiency, and real-time capabilities due to mechanical components.
  • Miniaturization is key for developing compact and energy-efficient spectral sensing systems.

Purpose of the Study:

  • To develop a miniaturized computational spectral sensing platform for high-resolution and dynamic spectral analysis.
  • To achieve energy-efficient, real-time spectral monitoring with low power consumption.

Main Methods:

  • Utilized a ferroelectrically reconfigurable WSe2 homojunction for spectral sensing.
  • Implemented event-driven triggers and computational reconstruction for real-time spectral tracking.
  • Leveraged ferroelectric polarization for non-volatile, near-zero-power standby operation.

Main Results:

  • Achieved high-resolution spectral reconstruction and dynamic spectral sensing across a broad spectrum (450 nm-950 nm).
  • Demonstrated real-time spectral tracking with approximately 32 µs response latency.
  • Validated the system by monitoring VO2 film phase transitions, showcasing its capability to detect dynamic spectral variations.

Conclusions:

  • The developed platform offers a low-power, real-time solution for spectral sensing.
  • This technology holds significant potential for advancing on-site spectral analysis applications.