Temperature Dependence of Sensors Based on Silver-Decorated Nitrogen-Doped Multiwalled Carbon Nanotubes

Eduardo Gracia-Espino, Bernabé Rebollo-Plata, Hugo Martínez-Gutiérrez, Emilio Muñoz-Sandoval, Florentino López-Urías, Morinobu Endo, Humberto Terrones, Mauricio Terrones

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Vapor sensors are easily fabricated onto alumina substrates using foils of silver-decorated nitrogen-doped multiwalled carbon nanotubes (CNX-MWNTs-Ag) as active sensing material. The vapor sensors are tested using carbon disulfide, acetone, ethanol, and chloroform vapors. The CNX-MWNTs are produced by chemical vapor deposition process and then decorated with 14 nm Ag nanoparticles (Ag-NPs). The samples are characterized using scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. Our results demonstrate that Ag-decorated CNX-MWNTs exhibit a better response and sensitivity when compared with pristine CNX-MWNTs based sensors, making them promising candidates for air-pollutants environmental monitoring. The temperature effect on the sensor performance is also studied; we found that the detection mechanism could be tuned from physisorption, at room temperature, to chemisorption at higher working temperature. Finally, first-principles density functional calculations are carried out to understand the interactions between the systems involved in the sensors, finding good agreement between experimental results and the theoretical approach.

Original languageEnglish (US)
Article number4319498
JournalJournal of Sensors
Volume2016
DOIs
Publication statusPublished - Jan 1 2016

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Instrumentation
  • Electrical and Electronic Engineering

Cite this

Gracia-Espino, E., Rebollo-Plata, B., Martínez-Gutiérrez, H., Muñoz-Sandoval, E., López-Urías, F., Endo, M., ... Terrones, M. (2016). Temperature Dependence of Sensors Based on Silver-Decorated Nitrogen-Doped Multiwalled Carbon Nanotubes. Journal of Sensors, 2016, [4319498]. https://doi.org/10.1155/2016/4319498