Insights into the effect of Au particle size on triethylamine sensing properties based on a Au–ZnO nanoflower sensor

Abstract

Triethylamine (TEA) pollution is harmful to human and environment tremendously, however, the TEA sensing properties like response and selectivity should be further improved to satisfy the requirements of the actual...

Atomically dispersed rhodium on ordered macroporous In2O3 for the highly sensitive detection of ethanol and the sensing mechanism

“…S9, ESI†), which will lead to the formation of the electron depletion layer and increasing of the sensor resistance. 41 The reaction is as eqn (8) and (9).O 2 (gas) → O 2 (ads)O 2 (ads) + 2e − → 2O − (ads)When the sensor is exposed to ethanol, the ethanol dehydrogenates to form acetaldehyde on the surface of RhSA–In 2 O 3 . Then the acetaldehyde undergoes a redox reaction with adsorbed oxygen to form CO 2 and H 2 O by eqn (10) and (11).…”

“…S9, ESI †), which will lead to the formation of the electron depletion layer and increasing of the sensor resistance. 41 The reaction is as eqn ( 8) and (9).…”

Novel Au Nanoparticle-Modified ZnO Nanorod Arrays for Enhanced Photoluminescence-Based Optical Sensing of Oxygen

“…Temperature ( T ) affects the PL intensity of the Au/ZnO NRs and their gas-sensing characteristics. When the temperature rises, the target gas receives more energy; the surface defect activity of the sample is improved, and the concentration of the gas adsorption site is increased, which contributes to improving the reaction sensitivity of the sample to detect gas and effectively shortens its adsorption and desorption times [ 47 , 48 , 49 ]. PL spectra of the Au/ZnO NR samples were measured in a 20% oxygen atmosphere at different temperatures ( T ).…”

“…According to the literature, the expansion or contraction of the electron depletion layer on the surface of ZnO is attributed to the adsorption/desorption of oxygen species in the environment, which can capture or release electrons [ 47 , 48 , 49 , 50 ]. Since the depletion layer has a great influence on the visible emission of ZnO and has little contribution to the UV emission, the UV emission intensity mainly depends on the volume of the “non depletion” area below the depletion layer.…”

ZnO Nanorod-Immobilized Pt Single-Atoms as an Ultrasensitive Sensor for Triethylamine Detection

“…The low sensitivity is largely stemmed from very difficult activation of adsorbed oxygen and TEA molecule on the oxide surface, thus resulting in poor electron transfer ability and small resistance change. This dilemma can be addressed by loading highly active noble metals on metal oxide surface to enhance the activation of gas molecules. − TEA sensors loaded with Pt, Au, Ag, and other nanoparticles on metal oxides have been reported in the literatures, and their sensitivity is 2–50 times higher than pure metal oxide sensors. − Notably, current studies have disclosed that uniform distribution in the form of single atoms on the support can maximize the exposure of precious metal atoms and achieve high activity and selectivity of the catalytic reaction. − Therefore, anchoring single-atom catalysts on metal oxide may greatly facilitate the adsorption and activation of oxygen and TEA molecules at the single-atom sites, enabling the sensors to obtain high sensitivity and high selectivity. For example, Zhang’s team reported that the single-atom Pt functionalized SnO 2 ultrathin film sensor showed a high response of 136.2 to 10 ppm TEA at 200 °C, which is 9 times higher than the pristine SnO 2 .…”