Ozone sensing based on palladium decorated carbon nanotubes

• Published in: Sensors (Basel, Switzerland) Vol. 14; no. 4; pp. 6806 - 6818
• Main Authors: Colindres, Selene Capula, Aguir, Khalifa, Cervantes Sodi, Felipe, Vargas, Luis Villa, Salazar, José Moncayo, Febles, Vicente Garibay
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 14.04.2014; MDPI
• Subjects: Adsorption; Biosensing Techniques - methods; Carbon; Carbon nanotubes; Chemical vapor deposition; Decoration; Deposition; Devices; Electric Impedance; Electrodes; Electrons; gas sensor; Gases; Incorporation; multiwall carbon nanotubes; Nanoparticles; Nanotubes, Carbon - chemistry; Nanotubes, Carbon - ultrastructure; Outdoor air quality; Ozone; Ozone - analysis; Palladium; Palladium - chemistry; Pd nanoparticles; Sensors; Spectrum Analysis, Raman; Temperature; France; Mexico
• ISSN: 1424-8220; 1424-8220
• DOI: 10.3390/s140406806

Multiwall carbon nanotubes (MWCNTs) were easily and efficiently decorated with Pd nanoparticles through a vapor-phase impregnation-decomposition method starting from palladium acetylacetonates. The sensor device consisted on a film of sensitive material (MWCNTs-Pd) deposited by drop coating on platinum interdigitated electrodes on a SiO₂ substrate. The sensor exhibited a resistance change to ozone (O₃) with a response time of 60 s at different temperatures and the capability of detecting concentrations up to 20 ppb. The sensor shows the best response when exposed to O3 at 120 °C. The device shows a very reproducible sensor performance, with high repeatability, full recovery and efficient response.