Ethanol sensing with Au-modified ZnO microwires

Surface functionalization of ZnO:Ag columnar thin films with AgAu and AgPt bimetallic alloy nanoparticles as an efficient pathway for highly sensitive gas discrimination and early hazard detection in batteries

“…21 For the AgAu/ZnO:Ag columnar lms, the greatly enhanced sensing properties towards VOCs can be explained by the excellent catalytic properties of the Au component of the NPs towards the dissociation of oxygen and the (partial) oxidation of the VOC molecules. 20,[66][67][68][69] The Au NPs will provide more active sites for the adsorption of oxygen species than the pristine surface of ZnO. 70 Many studies have demonstrated that the addition of Au NPs to nano-and microstructures of metal oxides leads to an enhancement in the overall response and selectivity to VOC vapors.…”

“…70 Many studies have demonstrated that the addition of Au NPs to nano-and microstructures of metal oxides leads to an enhancement in the overall response and selectivity to VOC vapors. [67][68][69][70][71] The proposed reaction for the oxidation of the VOC molecules by the adsorbed oxygen species can be described as follows: 11,70,[72][73][74] (Acetone) CH 3 The high response to 2-propanol, compared to other VOC vapors, can be explained by the presence of methyne (CH) groups, which are essential for a more efficient decomposition and oxidation of this molecule. 75,76 The general reaction can be described as: 77 VOC + nO À / aCO 2 + bH 2 O + ne À (7)…”

Light-Activated Metal Oxide Gas Sensors: A Review

“…Generally, the response time (T res ) and recovery time (T rec ) are defined as time spent by a sensor to achieve 90% of the total resistance change during the adsorption and desorption process respectively [ 15 , 17 , 18 ]. In some cases, the work defines the response time and recovery time as the time required for the sensor to achieve 90% of the total current change [ 19 ] or 90% of the total response change [ 20 ].…”

Novel Route for Fabrication of ZnO nanorods-Au Nanoparticles Hybrids Directly Supported on Substrate and their Application as Gas Sensors

“…In order to ensure higher surface-to-volume ratios and one-dimensional electron mobility along growth directions and improve the sensors' characteristics, researchers have focused on making gas sensor devices from ZnO nanostructures [17][18][19][20][21] or ZnO nanostructures modified with Au nanoparticles (Au NPs) 8,18,22-23 . However, a number of steps are involved in preparing sensors from nanostructures or hybrids.…”