2 results about "Chemiresistor" patented technology

Nanoparticle-fibrous membrane composites are provided as tunable interfacial scaffolds for flexible chemical sensors and biosensors by assembling gold nanoparticles (Au NPs) in a fibrous membrane. The gold nanoparticles are functionalized with organic, polymeric and / or biological molecules. The fibrous membranes may include different filter papers, with one example featuring a multilayered fibrous membrane consisting of a cellulose nanofiber (CN) top layer, an electrospun polyacrylonitrile (PAN) nanofibrous midlayer (or alternate material), and a non-woven polyethylene terephthalate (PET) fibrous support layer, with the nanoparticles provided on the fibrous membranes through interparticle molecular / polymeric linkages and nanoparticle-nanofibrous interactions. Molecular linkers may be employed to tune hydrogen bonding and electrostatic and / or hydrophobic / hydrophilic interactions to provide sensor specificity to gases or liquids. The sensors act as chemiresistor-type sensors. A preferred implementation is a sweat sensor.

A method for manufacturing oxidized MXene according to a preferred embodiment may remove fluorine groups (F) on a surface of MXene and form OH functional groups through an oxidation process to effectively adsorb CO2 molecules and reversibly change electrical conductance according to gas concentration. In addition, a chemimemristor device based on the oxidized MXene (Mn+1Xn(OH)2) may simultaneously implement memristor and gas sensor functions in a single device, and maintain multiple levels of conductance depending on the concentration of adsorbed molecules, and implement, based thereon, reversible changes in conductance according to a concentration of CO2 and multi-level information processing through its characteristics of learning multi-level operations and molecular adsorption history to mimic the human sense of smell and synaptic plasticity of the brain.