Comparative Study on the Effect of Protonation Control for Resistive Gas Sensor Based on Close-Packed Polypyrrole Nanoparticles

Abstract

Conducting polymers are often used as sensor electrodes due to their conjugated chain structure, which leads to high sensitivity and rapid response at room temperature. Numerous studies have been conducted on the structures of conducting polymer nanomaterials to increase the active surface area for the target materials. However, studies on the control of the chemical state of conducting polymer chains and the modification of the sensing signal transfer with these changes have not been reported. In this work, polypyrrole nanoparticles (PPyNPs), where is PPy is a conducting polymer, are applied as a sensor transducer to analyze the chemical sensing ability of the electrode. In particular, the protonation of PPy is adjusted by chemical methods to modify the transfer sensing signals with changes in the polymer chain structure. The PPyNPs that were modified at pH 1 exhibit high sensitivity to the target analyte (down to 1 ppb of NH3) with short response and recovery times of less than 20 s and 50 s, respectively, at 25 °C.

Multifunctional Polypyrrole-Based Textile Sensors for Integration into Personal Protection Equipment

“…As a result, cations are generated, which increase the conductivity by being mobile across the polymer. In addition, chloride anions might also be incorporated in PPy, which contributes to the increase in electrical conductivity [ 40 , 41 , 42 , 43 , 44 ] ( Figure 8 ).…”

“…As a result, cations are generated, which increase the conductivity by being mobile across the polymer. In addition, chloride anions might also be incorporated in PPy, which contributes to the increase in electrical conductivity [40][41][42][43][44] (Figure 8). In our study, a decrease in electrical resistance of the PPy-coated PA66 fabric due to exposure to HCl can be observed, as shown in Figure 9.…”

Gas sensing based on organic composite materials: Review of sensor types, progresses and challenges

“…Response and recovery times were 65 s and 668 s, respectively. In another example, polypyrrole nanoparticles (PPyNPs) were used to improve the response of an ammonia sensor based on IDEs by Kim et al [54]. Good sensitivity (2.5%) was obtained, with short response and recovery times, at low ammonia concentration (down to 1 ppb of NH 3 ).…”

Bibliometric analysis on conducting polymer sensors for ammonia gas detection using Scopus database

“…Mechanisms were optimized with additional information from open-access sources. 26,28,29 conducted to apprehend the current situation, key topics, and future outlook of the CPAD sensor field by using the largest reliable database held by SCOPUS itself. [30][31][32]…”

“…Various interaction mechanisms of CPs toward NH 3 gas detection. Mechanisms were optimized with additional information from open‐access sources 26,28,29 …”