Estimation of pore sizes using laser absorption in molecular oxygen gas enclosed in mesoporous alumina

Ahmed Al-Saudi*, Watheq Al-Basheer, Abdulaziz Aljalal, Khaled Gasmi, Samer Qari

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

Collisions of gas molecules with the walls of small pores in nanoporous materials can cause the width of gas absorption lines to become wider. Also, the effective absorption path lengths through the gas become longer due to multi-scattering within the nanoporous materials. GAs in Scattering Media Absorption Spectroscopy (GASMAS) is an effective technique that can differentiate between the absorption from the gas within pores and the absorption from the bulk of scattering materials. A Vertical-Cavity Surface-Emitting Laser (VCSEL) emitting around 760 nm is used to investigate the absorption from molecular oxygen gas trapped within mesoporous alumina Al2O3. The pore size of the alumina samples are also characterized based on Barrett, Joyner and Halenda (BJH) method. In this work, we will present the correlation between the pore sizes of the mesoporous alumina samples the width of the absorption line of molecular oxygen gas under different experimental conditions.

Original languageEnglish
Title of host publicationOptical Sensors 2019
EditorsFrancesco Baldini, Jiri Homola, Robert A. Lieberman
PublisherSPIE
ISBN (Electronic)9781510627222
DOIs
StatePublished - 2019

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume11028
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Bibliographical note

Publisher Copyright:
© 2019 SPIE

Keywords

  • Alumina
  • BJH method
  • FWHM
  • GAs in scattering media absorption spectroscopy
  • Laser absorption
  • Oxygen line broadening
  • Pore size
  • Porosity
  • VCSEL 760nm

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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