Room temperature CO2 sensing using Au-decorated ZnO nanorods deposited on an optical fiber

Mario Enrique Álvarez-Ramos*, Jorge Isaac Necochea-Chamorro, Roberto Carlos Carrillo-Torres, Raúl Sánchez-Zeferino

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Zinc oxide nanorods decorated with gold nanoparticles were deposited on an optical fiber and were used for carbon dioxide gas detection at room temperature. This optical gas sensor is based on the changes in the intensity of transmitted light due to the interaction of gas molecules with zinc oxide surface. Zinc oxide nanorods were prepared by ultrasonic method and were decorated with spheroidal 20 nm gold nanoparticles. Sensing experiments were carried out using two different wavelengths. The sensor can respond to a CO2 atmosphere and recover to its original state once the gas is removed, showing a better response when red light is used. Moreover, it responds almost linearly with concentration until 2000 sccm. The incorporation of gold nanoparticles greatly reduces the sensitivity of the sensor and increases its recovery time. Preliminary results demonstrate that the sensor could also be used to sense vapors of common solvents.

Original languageEnglish
Article number114720
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
StatePublished - Dec 2020

Bibliographical note

Funding Information:
This work was supported by Consejo Nacional de Ciencia y Tecnología-México (CONACyT-Mexico) through projects 255791-INFR-2015 and 226208-INFR-2014. J. I. Necochea-Chamorro acknowledge the scholarship provided by CONACyT.

Publisher Copyright:
© 2020

Copyright 2020 Elsevier B.V., All rights reserved.


  • Carbon dioxide
  • Gold nanoparticles
  • Optical fiber sensor
  • Zinc oxide nanorods


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