On the mechanism of proton conductivity of polyantimonic acid

Kovalenko, Liliya Yu.; Burmistrov, V. A.; Zakhar'evich, D. A.; Калганов, Д. А.

doi:10.47475/2500-0101-2021-16108

Cited by 2 publications

(3 citation statements)

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“…Several studies, even considering that the number of water molecules is variable, have given rise to similar results regarding the level of the structural organization of the crystal, having obtained a cubic organization of pyrochlore of the Fd3m group with the lattice size a ≈ 10.38 Å [20,24,45,46]. The extent of PAA crystallization varies according to the number of water molecules in its structure [20], a fact verified with an X-ray diffraction analysis, XRD, in a study of PAA samples for different ageing states.…”

Section: Introductionmentioning

confidence: 68%

“…In an attempt to describe the mechanisms of proton conduction in PAA crystalline-form samples, the existence of a nucleus formed by [Sb 2 O 6 ] 2− in an octahedron, connected by vertices where the hexagonal channels contain H 3 O + ions and adsorbed water molecules, was proposed in a recent work [46]. It should be noted that for this case, the formula considered for the PAA was H 2 Sb 2 O 6 •n H 2 O (2 < n < 5) [46].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Polyantimonic-Based Materials’ Moisture Response with Binder Content Tuning

Mendes,

Kurapova,

Faia

2023

Chemosensors

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Humidity sensors are of huge importance in diverse domains. Several types of materials present a moisture-sensing capacity; however, frequently, their electrical response does not display time stability. Due to its high thermal stability, high ionic conductivity, and different conduction mechanism contributing to its overall conductivity, polyantimonic acid (PAA) is seen as a promising material for humidity-sensing devices. In the present work, crystalline PAA was obtained via a simple and safe hydrolysis technique using SbCl3 as a precursor. Bulky sensor samples were produced using different amounts of polyvinyl alcohol (10–20 wt.% PVA) as a binder. The obtained PAA solid sensors were tested at room temperature (RT) in order to evaluate their moisture detection/measuring ability in the relative humidity range 0–100%; the evaluation was carried out with electrical impedance spectroscopy. The sample’s structure and morphology were studied using diverse experimental techniques (porosimetry, scanning electron microscopy, X-ray diffraction analysis, and thermogravimetry analysis, etc.). The sensors’ electrical response was in line with the found structural and morphological features. The slope of the resistance variation with an RH percentage concentration between 1 kΩ and 1.5 kΩ was noted for all sensors (showing no changes with time) in the interval between 30 and 100% RH. A good repeatability and reproducibility of the evaluated sensors’ electrical response was observed: the ones that displayed a higher sensitivity were the ones with a high PVA binder content, higher than previously published results for PAA, as well as a very good time stability along the time and low hysteresis.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Enhancing Polyantimonic-Based Materials’ Moisture Response with Binder Content Tuning

Mendes,

Kurapova,

Faia

2023

Chemosensors

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“…As stated, PAA is a good proton conductor [31,32]. Despite the material is highly insoluble, high value of the dissociation constant of PAA ensures high proton conductivity of the material.…”

Section: Introductionmentioning

confidence: 97%

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

Mendes

Kurapova

Faia

et al. 2022

J Solid State Electrochem

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Humidity sensors are in high demand for many applications, such as environmental monitoring and air and food quality control. Despite many inorganic and organic materials exhibit moisture sensing properties, the electrical response of many existing sensors is not stable along the time. Polyantimonic acid (PAA) is characterized by elevated proton conductivity and by high thermal stability: consequently, it is seen as promising proton conductor for usage in humidity sensing devices. In this work, for the first time, PAA-based bulk solid membranes were produced and tested as potential materials for relative humidity (RH) detection and their moisture sensitivity was evaluated. Two different amounts of binder were used for moulding the solid sensors: the ones with 10% of binder were designated as 90PAA, while the ones with 20% were named 80PAA. The structures of the solid samples were investigated by X-ray diffraction (XRD) technique, adsorption–desorption curves via Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS) techniques. The electrical behaviour was examined at ambient temperature by electrical impedance spectroscopy in the entire relative humidity (RH) interval (0–100%) and in the frequency range of 40 Hz up to 60 MHz. Electrical response of the materials was correlated with the structural features of the membranes. Both 90PAA and 80PAA sensors showed total resistance 3 × 105 and 3.5 × 105 Ω at 10% RH, respectively. A linear decrease of the resistance on RH was observed in the range 30–90% RH for both sensors. The electrical response of the evaluated PAA-based sensors displays good repeatability and reproducibility: the ones with lower binder content showed higher moisture sensitivity as well as very good time stability over 1 year.

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On the mechanism of proton conductivity of polyantimonic acid

Cited by 2 publications

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Enhancing Polyantimonic-Based Materials’ Moisture Response with Binder Content Tuning

Enhancing Polyantimonic-Based Materials’ Moisture Response with Binder Content Tuning

Polyantimonic acid-based materials evaluated as moisture sensors at ambient temperature

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