Details

Autor(en) / Beteiligte

• Luechinger, Norman A
• Loher, Stefan
• Athanassiou, Evagelos K
• Grass, Robert N
• Stark, Wendelin J

Titel

Highly Sensitive Optical Detection of Humidity on Polymer/Metal Nanoparticle Hybrid Films

Ist Teil von

• Langmuir, 2007-03, Vol.23 (6), p.3473-3477

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2007

Quelle

MEDLINE

Beschreibungen/Notizen

• Porous metal films for optical humidity sensing were prepared from copper nanoparticles protected by a 2−3 nm carbon coating, a silicon tenside, and a polymeric wetting agent. Exposure to water or solvent vapor revealed an exceptional sensitivity with optical shifts in the visible light range of up to 50 nm for a change of 1% in relative humidity. These properties could be attributed to a combination of surface plasmon resonance effects at low humidity and thin film interference at higher water or solvent concentration in the surrounding air. The simple concept and use of ultra-low-cost materials suggests application of such porous metal-film-based optical humidity sensors in large-scale applications for food handling, storage, and transport.