Tuning the detection limit in hybrid organic-inorganic materials for improving electrical performance of sensing devices

All-polymer-based ammonia gas sensor: applying insights from the morphology-driven ac electrical performance

“…Figure 5 shows the Log 1/(R.n1/3) vs. n curve obtained through Equation 2. From the results shown in Figure 5, it is concluded that the mobility of hopping carriers changes with n. In contrast, the concentration of hopping carriers remains constant, as expected for moderately doped PANI [25,33,34] . Furthermore, n = 15 represents a region of rod-like transition to film-like architecture, as seen in Figure 2b.…”

“…C (10 For the study of the conduction process of ultrathin PANI/ PVS sensors, we assume that the admittance (1/R) is directly proportional to both electrical current and the nucleation of PANI/PVS particles induced by n (or the film growth) through the electronic hopping process described [25,[33][34][35] , and in agreement with both the establishment of mesoscopic metallic regions (conductive islands) [33] and the AFM results shown in Figure 2b. For this case, we expected the following dependence of the dc conductivity, represented here by 1/ Rn1/3 and that the concentration of hopping carriers remains constant independent of n [25,34] according to the expression:…”

“…This situation leads to measurement-tomeasurement variations [21,22] . Many studies have focused on the electrical field frequency-dependent impedance characteristics of ultrathin semiconducting polymer-based sensors as a practical solution to avoid sensor instability effects [13,[23][24][25][26][27] .…”

Year 2020: A Snapshot of the Last Progress in Flexible Printed Gas Sensors

“…This method allows printing speeds in the range of 8-100 m/min, greater than that of the here considered techniques [65]. As shown in the Table 1 few chemiresistive flexible gas sensors are fabricated by gravure printing [59][60][61][62].…”

Cadmium telluride/polypyrrole nanocomposite based Love wave sensors highly sensitive to acetone at room temperature

“…Usually, gas sensitive materials including metal oxides (MOXs), conductive polymers (CPs) or carbon-based materials, e.g., carbon nanotubes (CNTs), in their intrinsic form, can suffer from different disadvantages such as high working temperature, poor selectivity, or low response speed. Thus, a way to overcome these functional limitations frequently involves the incorporation of intentional impurities (metal ions, secondary phases) into these materials, which act as host systems [1][2][3][4][5]. Recently, inorganic-organic composites, for instance, based on combinations of CPs with noble metals or semiconducting MOX, have been reported as a suitable combination for enhancing the sensitivity to gases and vapors, which typically are tough to sense with intrinsic materials [6][7][8].…”