Detection of carboxylic acid vapor using poly(N,N-dimethylaminoethyl methacrylate)

Size‐Selective Silver‐Induced Evolution of Mn3O4−Ag Nanocomposites for Effective Ethanol Sensing

“…The Knudsen diffusion and molecular gas diffusion processes are described for the smaller (2-100 nm) and larger (above 100 nm) pore diameters of sensing materials, respectively. [74] To check the stability of the sensors, base resistance and response of Mn 3 O 4 -Ag@1 nanocomposites were tested for a period of four weeks under similar conditions. It is observed that the sensitivity does not decrease, considerably, during this time period indicating stability and reliability of the nanocomposite sensors for the detection of volatile organic compounds.…”

ZnAl2O4‐Functionalized Zinc Oxide Microstructures for Highly Selective Hydrogen Gas Sensing Applications

“…The increase in the response of metal oxide structures at increasing operating temperatures is well known and can be explained based on increased thermal energy, which becomes high enough to overcome the activation energy barrier for the reaction of gas molecules with adsorbed oxygen species. [47] In general, the gas response dependence on the operating temperature has a bell shape, [48] but in order to protect the sensor structures from eventual current spikes due to the exposure to high concentrations of reducing gases, we limited the maximum operating temperature to 100 C. Next, we exposed the ZnO:Al and ZnAl 2 O 4 /ZnO MWs to a wide range of H 2 gas concentrations (from 100 to 6400 ppm) at different operating temperatures. The results are presented in Figure 5b and c for the ZnO:Al and ZnAl 2 O 4 /ZnO MW, respectively, as well as in Supporting Information Table S2.…”

Glass‐Fabric Reinforced Ag Nanowire/Siloxane Composite Heater Substrate: Sub‐10 nm Metal@Metal Oxide Nanosheet for Sensitive Flexible Sensing Platform

“…However, the response time slightly reduced (4.20 min for the flat state, 3.93 min for the 1st bent state, and 3.27 min for the 2nd bent state) depending on the degree of bending ( Figure S10, Supporting Information). The decrease of response time is attributed to the formation of the open macropores under the bent states; since macrosized pores among the each Pt-SnO 2 NSs effectively contribute to rapid gas diffusion to inner side of sensing layers, [13,32] thus the slightly faster response and recovery characteristics were observed in bent states. Moreover, Pt-SnO 2 NSs sensor showed reliable response (R air /R gas ≈ 5 toward 1 ppm level of DMS molecules) even in the bent states, demonstrating sufficient potential feasibility for application in a flexible DMS detector especially for halitosis or spoiled food detector.…”

“…To address this issue, the use of thermally stable plastic substrate, enabling elevated temperature (>150 °C) operation of flexible sensors, is essentially required for reversible gas sensing characteristics. [13] For examples, An et al reported flexible heating substrate (≈150 °C) by employing CuZr nanotrough embedded polydimethylsiloxane (PDMS) substrate. [14] Choi et al integrated 2D RuO 2 nanosheets (NSs) on Ag nanowires (AgNW) embedded polyimide (PI) film as heat-generable substrate (≈100 °C) for flexible NO 2 sensors with enhanced reversibility.…”