Gold nanoparticles (Au-NPs) are electrochemically synthesized in the presence of tetra-alkyl-ammonium stabilizers and used as active element in Field Effect capacitive gas sensors. Before use, the sensing area is treated by a relatively mild annealing procedure aimed to partially remove the organic stabilizer without loosing the nano-structured character of the particles. Both pristine and annealed materials have been subjected to a spectroscopic and morphological characterization (by means of UV-Vis, XPS, TEM, SEM techniques). Preliminary results on the application of AuNPs as gate material for NOx sensing are reported. The sensor is able to detect NOx with appreciable selectivity and low response towards the other tested gases (C3H6, CO, H2, NH3).
Ieva, E., Buchholt, K., Colaianni, L., Cioffi, N., Sabbatini, L., Lloyd Spetz, A., et al. (2008). Au nanoparticles as Gate Material for NOx Field Effect Gas Sensors. ACM TRANSACTIONS ON SENSOR NETWORKS, 6(4), 577-584 [10.1166/sl.2008.433].
Au nanoparticles as Gate Material for NOx Field Effect Gas Sensors
CAPITANI, GIANCARLO
2008
Abstract
Gold nanoparticles (Au-NPs) are electrochemically synthesized in the presence of tetra-alkyl-ammonium stabilizers and used as active element in Field Effect capacitive gas sensors. Before use, the sensing area is treated by a relatively mild annealing procedure aimed to partially remove the organic stabilizer without loosing the nano-structured character of the particles. Both pristine and annealed materials have been subjected to a spectroscopic and morphological characterization (by means of UV-Vis, XPS, TEM, SEM techniques). Preliminary results on the application of AuNPs as gate material for NOx sensing are reported. The sensor is able to detect NOx with appreciable selectivity and low response towards the other tested gases (C3H6, CO, H2, NH3).
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