Microwave flexible gas sensor based on polymer multi wall carbon nanotubes sensitive layer

Chemical Gas Sensor Based on a Flexible Capacitive Microwave Transducer Associated with a Sensitive Carbon Composite Polymer Film

“…The experimental detection configuration is mainly based on a vapor generator (CALIBRAGE PUL 110), which is used to generate and control the concentrations of the target vapor from a liquid contained in a heated bottle. The vapor particles are transported by nitrogen as a carrier gas at a constant flow rate of 0.112 L/min [3,8]. A sequence of target vapor concentrations (C) was delivered on the two resonators of a device placed in the low cost test cell.…”

“…The geometry and configuration of this prototype is shown in Figure 1 (a) (b) The working principle is based on the perturbation of the electromagnetic field due to the presence of vapor. The target species are absorbed on the sensitive layer and modify the electrical properties of the materials thus the electrical behavior of the device [2,3] (pp. 876-886).…”

“…Using ANSYS-HFSS software which delivers 3-D full-wave simulation for RF components, we perform the simulation with paper as substrate (permittivity 3.05 and dielectric loss 0.089 at 4.3 GHz), silver nanoparticles as metallized lines, conductive polymer poly (3,4-ethylenedioxythiophene) polystyrene sulfonate with multi walled carbon nanotubes (PEDOT: PSS-MWCNTs) as sensitive layer. The material were considered as homogeneous in a first approximation, their parameters were measured and presented previously, in [3,6,7]. Figure 1b shows the S parameters of the simulated device.…”

“…[3][4]. This is related, among other things, to the complexity and diversification of pollutants, known as a source of irritation and decreased lung capacity.…”

“…The device is fabricated on a flexible paper substrate by inkjet printing technology [2] (pp. 876-886), [3][4][5] (pp. 425-435).…”