Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

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...
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given structure by adding the contributions...
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to the...
IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Wound documentation by doctors in academic emergency departments, Gauteng Province, South Africa.

South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·2025
Same author

Surfactant-free gold nanostars as a colloidal substrate for the surface-enhanced Raman spectroscopy of grouper epidermal mucus.

Nanotechnology·2025
Same author

New insights on the association of weight loss with the reduction in carotid intima-media thickness among patients with obesity: an updated systematic review and meta-analysis.

Public health·2023
Same author

Association between Fiber Intake and Risk of Incident Chronic Kidney Disease: The UK Biobank Study.

The journal of nutrition, health & aging·2023
Same author

Using available <i>in vitro</i> metabolite identification and time course kinetics for β-chloroprene and its metabolite, (1-chloroethenyl) oxirane, to include reactive oxidative metabolites and glutathione depletion in a PBPK model for β-chloroprene.

Frontiers in pharmacology·2023
Same author

[Research progress in clinicopathology, molecular genetics and therapy of angioimmunoblastic T-cell lymphoma].

Zhonghua bing li xue za zhi = Chinese journal of pathology·2023

Related Experiment Video

Updated: Jun 3, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

In situ Raman spectroscopy of H2 interaction with WO3 films.

J Z Ou1, M H Yaacob, M Breedon

  • 1School of Electrical and Computer Engineering, RMIT University, Melbourne, VIC, Australia. j.ou@student.rmit.edu.au

Physical Chemistry Chemical Physics : PCCP
|March 11, 2011
PubMed
Summary

Tungsten oxide (WO(3)) films with palladium (Pd) catalysts show altered Raman spectra when exposed to hydrogen (H(2)) gas. Optimizing annealing temperature, particularly to 500 °C, enhances H(2) detection sensitivity at 60 °C.

More Related Videos

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
15:08

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

Published on: September 20, 2012

Related Experiment Videos

Last Updated: Jun 3, 2026

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
11:38

In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework

Published on: February 1, 2020

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells
15:08

Probing and Mapping Electrode Surfaces in Solid Oxide Fuel Cells

Published on: September 20, 2012

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Tungsten oxide (WO(3)) exhibits temperature-dependent interactions with hydrogen gas (H(2)), influenced by noble metal catalysts and its crystalline structure.
  • The optical properties of WO(3) change upon interaction with H(2), a phenomenon crucial for gas sensing applications.

Purpose of the Study:

  • To investigate the in situ Raman spectra of palladium-catalyzed tungsten oxide (Pd/WO(3)) films with varying crystal phases upon exposure to H(2) at elevated temperatures.
  • To understand the role of WO(3) crystallinity and annealing temperature in H(2) gas sensing performance.

Main Methods:

  • Preparation of Pd/WO(3) films using RF sputtering, followed by annealing at 300, 400, and 500 °C to modify crystal phases.
  • Characterization using Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), UV-Visible (UV-VIS), and Raman spectroscopy.
  • In situ measurements of Raman spectra during exposure to 1% H(2) in synthetic air at temperatures ranging from 20 to 140 °C.

Main Results:

  • Raman spectra changes are primarily dependent on the crystal phase of WO(3), transitioning from monoclinic to a mixed monoclinic-orthorhombic phase with increased annealing temperature.
  • As-deposited Pd/WO(3) films exhibited consistent Raman responses to H(2) exposure across different operating conditions.
  • Annealing at 500 °C optimized the operating temperature for H(2) detection to 60 °C, indicating enhanced sensitivity.

Conclusions:

  • The crystal phase of WO(3) significantly influences its interaction with H(2) in the presence of Pd catalysts, as evidenced by Raman spectral changes.
  • Annealing temperature is a critical parameter for tuning the H(2) sensing performance of Pd/WO(3) films.
  • The study provides fundamental insights into the structure-property relationships of Pd/WO(3) for H(2) gas sensing applications.