Enhancement of the gas sensing performance of carbon nanotube networked films based on their electrophoretic functionalization with gold nanoparticles. Issue 1786 (2015)

• Record Type: Journal Article
• Authors: Dilonardo, E.; Penza, M.; Alvisi, M.; Di Franco, C.; Suriano, D.; Rossi, R.; Palmisano, F.; Torsi, L.; Cioffi, N.
• Editors: Bonaccorso, F.; Feng, X.; Ferrari, A.C.; Jorio, A.; Prato, M.
• Is Part Of: MRS proceedings. Issue 1786(2015)
• Page Start: 37
• Page End: 42
• Publication Date: 2015
• Subjects: sensor, -- surface chemistry, -- electrodeposition; Electrical engineering -- Congresses; Physics -- Congresses; Materials -- Research -- Congresses; Materials science -- Congresses; 620.11
• DOI: 10.1557/opl.2015.776
• Languages: English
• ISSNs: 0272-9172

Abstract

ABSTRACT: Controlled amounts of colloidal Au nanoparticles (NPs), electrochemically pre-synthesized, were directly deposited on MWCNTs sensor devices by electrophoresis. Pristine and Au-functionalized MWCNT networked films were tested as active layers in resistive gas sensors for detection of pollutant gases. Au-modified CNT-chemiresistor demonstrated higher sensitivity to NO2 detecting up to sub-ppm level compared to pristine one. The investigation of the cross-sensitivity towards other pollutant gases revealed the decrease of the sensitivity to NO2 with the increase of Au content, and, on the other side, the increase of that to H2 S; therefore the fine tune of the metal loading on CNTs has allowed to control not only the gas sensitivity but also the selectivity towards a specific gaseous analyte. Finally, the sensing properties of Au-decorated CNT sensor seem to be promising in environmental and automotive gas sensing applications, based on low power consumption and moderate operating temperature.