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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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A Novel Technique for Raman Analysis of Highly Radioactive Samples Using Any Standard Micro-Raman Spectrometer
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In Situ Raman Study on Thermal Decomposition of Exfoliated Two-Dimensional α-MoO3.

Baozheng Xu1,2, Fu Wang1,2, Yongjing Wang1,2

  • 1State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.

ACS Applied Materials & Interfaces
|May 28, 2026
PubMed
Summary
This summary is machine-generated.

Mechanically exfoliated two-dimensional orthorhombic molybdenum trioxide (α-MoO3) single crystals exhibit thermal degradation above 723 K. This study reveals how phonon dynamics and oxygen defects influence the decomposition of these optoelectronic materials.

Keywords:
in situ Raman spectroscopyphonon anharmonic interactionsphonon−phonon couplingthermal decompositionα-MoO3

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Area of Science:

  • Materials Science
  • Solid State Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) orthorhombic molybdenum trioxide (α-MoO3) single crystals are crucial for optoelectronics.
  • Thermal stability is a key parameter for the practical application of 2D α-MoO3.

Purpose of the Study:

  • To investigate the thermal degradation behavior of 2D α-MoO3 single crystals.
  • To understand the underlying mechanisms of thermal stability and decomposition.

Main Methods:

  • In situ Raman spectroscopy was employed to study mechanically exfoliated 2D α-MoO3 single crystals.
  • Measurements were conducted across a temperature range from 80 K to 803 K in vacuum.

Main Results:

  • Significant shifts in characteristic Raman peaks were observed between 80 K and 710 K, classified into quasi-linear, nonlinear, and temperature-insensitive modes.
  • Decomposition of 2D α-MoO3 initiated around 723 K, with substantial decomposition at 803 K.
  • Phonon dynamics and oxygen defects were identified as key factors modulating the decomposition process.

Conclusions:

  • The study provides critical insights into the lattice vibrational mechanisms and thermal stability of 2D α-MoO3.
  • Understanding thermal degradation is essential for optimizing the use of α-MoO3 in optoelectronic devices.