Electrosynthesis and characterization of gold nanoparticles for electronic capacitance sensing of pollutants
2011 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 56, no 10, 3713-3720 p.Article in journal (Refereed) Published
In the present study, gold/surfactant core/shell colloidal nanoparticles with a controlled morphology and chemical composition have been obtained via the so-called sacrificial anode technique, carried out in galvanostatic mode. As synthesized Au-NPs had an average core diameter comprised between 4 and 8 nm, as a function of the electrochemical process experimental conditions. The UV-Vis characterization of gold nanocolloids showed clear spectroscopic size effects, affecting both the position and width of the nanoparticle surface plasmon resonance peak. The nanomaterial surface spectroscopic characterization showed the presence of two chemical states, namely nanostructured Au(0) (its abundance being higher than 90%) and Au(I). Au-NPs were then deposited on the top of a capacitive field effect sensor and subjected to a mild thermal annealing aiming at removing the excess of stabilizing surfactant molecules. Au-NP sensors were tested towards some gases found in automotive gas exhausts. The sensing device showed the largest response towards NOx, and much smaller - if any - responses towards interferent species such as NH3, H-2, CO, and hydrocarbons.
Place, publisher, year, edition, pages
Elsevier Science B.V., Amsterdam. , 2011. Vol. 56, no 10, 3713-3720 p.
Gold nanoparticle, NOx sensing, XPS, Spectroscopic size effects, SAE
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-68228DOI: 10.1016/j.electacta.2010.12.105ISI: 000289964800044OAI: oai:DiVA.org:liu-68228DiVA: diva2:416854
Original Publication: Nicola Cioffi, Lorenzo Colaianni, Eliana Ieva, Rosa Pilolli, Nicoletta Ditaranto, Maria Daniela Angione, Serafina Cotrone, Kristina Buchholt, Anita Lloyd Spetz, Luigia Sabbatini and Luisa Torsi, Electrosynthesis and characterization of gold nanoparticles for electronic capacitance sensing of pollutants, 2011, ELECTROCHIMICA ACTA, (56), 10, 3713-3720. http://dx.doi.org/10.1016/j.electacta.2010.12.105 Copyright: Elsevier Science B.V., Amsterdam. http://www.elsevier.com/2011-05-132011-05-132016-06-13