Poly(aniline)-based ammonia sensors: Understanding the role of polyurethane on structural/morphological properties and sensing performances

da Silva, Edilene A.; Samuel, Cédric; Furini, Leonardo N.; Constantino, Carlos José L.; Redon, Nathalie; Duc, Caroline

doi:10.1016/j.snb.2023.134664

Cited by 8 publications

(9 citation statements)

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“…The latter point is the fact that the synthesized dPAni does not develop roughness and is mainly dependent on the structure of its substrate. The absence of nanomicrostructure of the material has been reported in Da Silva et al, using scanning electron microscopy, and it is confirmed by determined SSA. Note that SSA of dPAni also evidences the absence of intraparticular porosity in dPAni particles.…”

Section: Resultssupporting

confidence: 77%

“…Water is known for its impact on PAni-based sensor response to gases such as ammonia. , It is evidenced in this work that water accounts for a significant fraction of dPAni. To recall, the uptake study is conducted under dry conditions, yet water is known for its favorable interaction with ammonia .…”

Section: Discussionmentioning

confidence: 80%

“…Indeed, DCA is known in the literature for its role as a secondary dopant as it can induce conformational changes in polymeric chains. 19,32,33 TGA allowed unraveling the composition of dPAni. However, the distribution of the different molecules in the material is unknown, especially the partitioning between the bulk and the surface.…”

Section: Resultsmentioning

confidence: 99%

“…The protocol for preparation of doped PAni (dPAni) is adapted from Da Silva et al . This work was dedicated to high-performance ammonia sensors based on conductive PAni.…”

Section: Methodsmentioning

confidence: 99%

“…PAni Formulation and Characterization. The protocol for preparation of doped PAni (dPAni) is adapted from Da Silva et al 19 This work was dedicated to high-performance ammonia sensors based on conductive PAni. PAni (65,000 Mw, Sigma-Aldrich) is doped with camphor sulfonic acid (CSA, 99%, Acros Organics) in a ratio allowing the doping of 50% of the nitrogen atoms from PAni.…”

Section: Conductive Polymer Formulation and Characterizationsmentioning

confidence: 99%

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Unraveling Ammonia and Trimethylamine Uptake on Conductive Doped Polyaniline

Pascaud,

Thevenet,

Duc

et al. 2024

Langmuir

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Polyaniline (PAni)-based sensors are a promising solution for ammonia (NH3) detection at the ppb level. However, the nature of the NH3–PAni interaction and underlying drivers remain unclear. This paper proposes to characterize the interaction between doped PAni (dPAni) sensing material and NH3 by using a Knudsen cell. First, to characterize the dPAni interface, the probe-gas method, i.e., titration of surface sites with a gas of specific properties, is deployed. The dPAni interface is found to be homogeneous with more than 96% of surface sites of acid nature or with hydroxyl functional groups. This result highlights that basic gases such as amines might act as interfering gases for NH3 detection by polyaniline-based sensors. Second, the adsorption isotherms of NH3 and trimethylamine (TMA) on dPAni are reported at ambient temperature conditions, 293 K. The uptake of NH3 and TMA on dPAni follows a Langmuir-type behavior. This approach allows for the first time to quantify the uptake of NH3 and TMA on gas-sensor materials and determine typical Langmuir adsorption parameters, i.e., the partitioning coefficient, K Lang, and the maximum surface coverage, N max. The corresponding values obtained for NH3 and TMA are K lang (NH3) = 19.7 × 10–15 cm3 molecules–1 N max (NH3) = 11.6 × 1014 molecules cm–2, K Lang (TMA) = 7.0 × 10–15 cm3 molecules–1 N max (TMA) = 5.0 × 1014 molecules cm–2. K Lang and N max values of NH3 are higher than those of TMA, suggesting that NH3 is more efficiently taken up than TMA on dPAni. The results of this work suggest that strong hydrogen bonding drives the performance of a polyaniline-based gas sensor for NH3 and amines. In conclusion, the Knudsen cell approach allows reconsidering the fundamentals of NH3 interactions with dPAni and provides new insights on drivers to enhance sensing properties.

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Section: Resultssupporting

confidence: 77%

Section: Discussionmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 99%

“…The protocol for preparation of doped PAni (dPAni) is adapted from Da Silva et al . This work was dedicated to high-performance ammonia sensors based on conductive PAni.…”

Section: Methodsmentioning

confidence: 99%

Section: Conductive Polymer Formulation and Characterizationsmentioning

confidence: 99%

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