Nanocrystalline ruthenium oxide and ruthenium in sensing applications - an experimental and theoretical study

Summary, in English

In this project, we have explored RuO2 and Ru nanoparticles (∼ ∼10 and ∼ ∼5 nm, respectively, estimated from XRD data) to be used as gate material in field effect sensor devices. The particles were synthesized by wet chemical procedure. The capacitance versus voltage characteristics of the studied capacitance shifts to a lower voltage while exposed to reducing gases. The main objectives are to improve the selectivity of the FET sensors by tailoring the dimension and surface chemistry of the nanoparticles and to improve the high temperature stability. The sensors were characterized using capacitance versus voltage measurements, at different frequencies, 500 Hz to 1 MHz, and temperatures at 100–400°C. The sensor response patterns have been found to depend on operating temperature. X-ray photoelectron spectroscopy (XPS) analyses were performed to investigate the oxidation state due to gas exposure. Quantum-chemical computations suggest that heterolytic dissociative adsorption is favored and preliminary computations regarding water formation from adsorbed hydrogen and oxygen was also performed.

• Author: Anette Salomonsson; Rodrigo M Petoral; Kajsa Uvdal; Christian Aulin; Per-Olov Kall; Lars Ojamae; Michael Strand; Mehri Sanati; Anita Lloyd Spetz
• Department/s: Ergonomics and Aerosol Technology
• Publishing year: 2006
• Language: English
• Pages: 899-910
• Publication/Series: Journal of Nanoparticle Research
• Volume: 8
• Issue: 6
• Links: http://dx.doi.org/10.1007/s11051-005-9058-1
• Document type: Journal article
• Publisher: Springer
• Topic: Production Engineering, Human Work Science and Ergonomics
• Keywords: nanoparticles; gas sensors; RuO2; Ru; FET devices
• Status: Published
• ISBN/ISSN/Other: ISSN: 1572-896X