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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

1.3K
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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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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UV–Vis Spectrum01:30

UV–Vis Spectrum

1.1K
When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.     
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UV–Vis Spectroscopy of Conjugated Systems01:32

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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...
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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

1.4K
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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Fluorescence Lifetime Macro Imager for Biomedical Applications
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MoOx-Based Colorimetric Sensor for Ultraviolet Visualization.

Zhaokang Zheng1, Zhen Liu1, Xingying Li1

  • 1College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China.

Molecules (Basel, Switzerland)
|April 13, 2024
PubMed
Summary
This summary is machine-generated.

New molybdenum oxide (MoOx) nanostructures offer a unique, selective, and stable solution for detecting harmful ultraviolet radiation. This advancement provides a faster, more reliable method for personal protection against increasing UV exposure.

Keywords:
MoOx nanostructuresphotochromic compoundsultraviolet sensorsvisual analysisvisualization

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Sensor Technology

Background:

  • Global ozone layer depletion and ozone holes increase human exposure to dangerous solar ultraviolet (UV) radiation.
  • Development of effective UV sensors is crucial for personal protection and environmental monitoring.
  • Nanomaterials present promising characteristics for advanced UV sensing applications.

Purpose of the Study:

  • To synthesize and characterize novel MoOx nanostructures for UV sensing.
  • To evaluate the performance of MoOx nanostructures as UV sensors, focusing on selectivity, sensitivity, speed, and stability.
  • To explore advanced detection and analysis capabilities beyond traditional electrical outputs.

Main Methods:

  • Synthesis of MoOx nanostructures using a hydrothermal method.
  • Characterization of MoOx nanostructures' properties.
  • Testing of the developed sensor's performance under full-band light, including electrical signal output and visual analysis.

Main Results:

  • MoOx nanostructures demonstrated high uniqueness, selectivity, and excellent stability compared to traditional photochromic compounds.
  • The sensor achieved rapid and accurate UV detection across the full spectrum of light.
  • The sensor offers both traditional electrical signal output and advanced visual amplification, display, and analysis capabilities.

Conclusions:

  • Hydrothermally synthesized MoOx nanostructures are highly effective materials for advanced UV sensing.
  • The developed UV sensor offers superior performance, reliability, and practicality for personal protection and monitoring.
  • The integration of visual analysis enhances the sensor's utility and data interpretation.