An Inkjet Printed CO2 Gas Sensor

Graphene-based CO2 sensing and its cross-sensitivity with humidity

“…In order to further illustrate this point, Table 1 compares device responsivities for a number of competing CO 2 sensing technologies to our devices in the range from 0 to 2000 ppm. [67][68][69][70] The comparison includes mechanically exfoliated (pristine) graphene, 67 graphene oxide, 68 carbon nanotubes (CNTs), 69 printed graphene 70 resistive sensors as well as several capacitive sensors. [71][72][73][74] However, the majority of sensors in literature only investigate on CO 2 concentrations ranging below 2000 ppm making comparison difficult at much larger concentrations.…”

“…We therefore speculate that the observed effect is a capacitive coupling effect that causes an increase of charge carriers in the graphene that then diffuses as the CO 2 molecules discharge through collisions with the grounded chamber walls. Such behavior would explain the exponential resistance decay in the 67 Pristine graphene Resistive 8 0.17 Haz et al 68 Graphene oxide Resistive 240 0.047* Haz et al 68 rGO Resistive 240 0.033* Ong et al 69 MWCNT Resistive 45 -Andò et al 70 InkJet graphene Resistive -0.000235* Mutschall et al 71 AMO/PTMS Capacitive -0.000875* Kim et al 74 AMO/PTMS Capacitive -0.0004* graphene. Fig.…”

Potential for Sensor Systems to Monitor Fruit Physiology of Mango during Long-Distance Transport

“…Thus, the use of EC sensors for ethylene measurement was explored. Meanwhile, the possibility for using NP sensors for detection of CO2 concentration was judged to be feasible (Andò et al, 2015;Wang et al, 2016) and the research was made to develop such sensors together with partners in Japan. A model system was proposed as shown in Fig.…”

Chemical Sensors and Biosensors in Italy: A Review of the 2015 Literature

“…Graphene/ionic liquid (B mim + Cl − and B mim + Br − ) gels were electrochemically synthesized in order to realize nanocomposites characterized by a specific surface area up to 2700 m 2 /g. Both gels have shown a marked reactivity towards caffeic acid, a well-known pharmacological agent, linear in a quite wide range of concentration (from 0.025 to 2.00 M) and with optimal performances in terms of reproducibility (intra reproducibility: 1.40%; inter-electrode reproducibility: 3.20%), sensitivity (3389/μA mM −1 cm −2 ), fast response time (2 s) and detection limit (0.005 mM) [31]. …”