Nanofibrous PANI-based conductive polymers for trace gas analysis

Macagnano, Antonella; Zampetti, Emiliano; Pantalei, S.; Cesare, Fabrizio De; Bearzotti, Andrea; Persaud, Krishna

doi:10.1016/j.tsf.2011.04.175

Cited by 39 publications

(28 citation statements)

References 28 publications

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“…However, this is not the case for this study, as methanol induces a higher response than does ethanol. The second mechanism involves ion-dipole interaction of alcohol molecules with the imine nitrogen of PANi, which expands the PANi backbone into a more linear conformation, causing a decrease in electrical resistance [38][39][40]. Alcohols with higher relative polarity will effect a greater change (relative polarities of methanol, ethanol, and 1-propanol are 0.762, 0.654, and 0.617, respectively) [41,42].…”

Section: Detection Of Aliphatic Alcohol Vaporsmentioning

confidence: 99%

Tunable Enhancement of a Graphene/Polyaniline/Poly(ethylene oxide) Composite Electrospun Nanofiber Gas Sensor

2017

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Electrospun nanofibers of a polyaniline (PANi)/ (?)-camphor-10-sulfonic acid (HCSA)/poly(ethylene oxide) (PEO) composite doped with different variants of graphene oxide (GO) were fabricated and evaluated as chemiresistor gas sensors operating at room temperature. A new strategy for enhancing PANi/PEO gas sensor performance is demonstrated using GO dopants reduced via thermal (trGO) or chemical (crGO) routes. By varying the chemical reduction duration (6 h, crGO-6 or 24 h, crGO-24), tunable enhancement of sensor response was achieved. Upon exposure to short-chain aliphatic alcohol vapors, the partially reduced crGO-6 dopant exhibited higher response than GO and crGO-24, suggesting that the dopant enhances sensor performance via increased electrical conductivity over neat GO, and enhanced hydrogen bonding capability over the further-reduced crGO-24 variant. Sensor arrays consisting of PANi/PEO doped with trGO, crGO-6 or crGO-24 moieties successfully identified methanol, ethanol, and 1-propanol vapors using principal component analysis (PCA). Graphical abstract

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Section: Detection Of Aliphatic Alcohol Vaporsmentioning

confidence: 99%

Tunable Enhancement of a Graphene/Polyaniline/Poly(ethylene oxide) Composite Electrospun Nanofiber Gas Sensor

2017

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“…Polyaniline doped with HCSA was dissolved in a mixture of chloroform / ethanol (9: 1 by volume) and the resulting solution was mixed with poly (vinyl pyrrolidone) (PVP) (1.5 PVP / PAN) and polyethylene oxide (PEO) (0.62 PEO / PANI), the two polymer solutions being then electrospun to obtain sensors. It was found that PANI-PEO was the most porous layer with good electrical performance and high sensitivity to ammonia, but fragile when subjected to environmental stress such as high humidity and temperature, while PANI-PVP proved to be a very good sensor for NO 2 , but it was strongly influenced by humidity even at low values [44]. Dodecylbenzene sulfonic acid (DBSA) appeared as a promising dopant and surfactant and is frequently applied in various protocols for soluble PANI synthesis [45].…”

Section: Doping Agentsmentioning

confidence: 99%

Associated Polymers, Solvents and Doping Agents to Make Polyaniline Electrospinnable

Bertea

Manea

Hristian

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Polyaniline (PANI) is a conductive polymer that has both metal (electrical, electronic, optical and magnetic properties) and polymer characteristics (low density, low-cost and resistance to chemicals). Polyaniline becomes a conductor by treatment with a dopant that acts by extracting electrons (oxidation) or by inserting electrons (reduction). The reduced solubility of PANI in all common solvents restricts its capacity to be electrospun into uniform fibers. The present paper reviews the methods to increase the solubility of PANI by blending it with other polymers and doping it with organic acids, highlighting the best polymer/solvent couples and doping agents.

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“…However, the sensing curves were shifting, and the response went out of normal range when the humidity was at greater than RH 50 %. A. Macagnano et al fabricated a PANI/PEO based gas sensor and its response up to 50 % RH [44]. The hydrophilic functional group-hydroxyl group (ÀOÀH) contained in the PEO structure resulted in both facilitating the speed of water vapor absorption and enhancing water vapor diffusion into the polymer.…”

Section: Device Performancementioning

confidence: 99%

Electrospun Polyaniline/Poly(ethylene oxide) Composite Nanofibers Based Gas Sensor

Chartuprayoon

Bosze

et al. 2014

Electroanalysis

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Camphor‐10‐sulfonic acid (HCSA) doped polyaniline (PANI)/poly(ethylene oxide) (PEO) composite nanofibers with different compositions (12 to 52 wt.% of PANI) were synthesized by an electrospinning method and their properties including optical, electrical and sensing were systematically investigated. FT‐IR shows that an increase of IR absorbance ratios of aromatic CC stretching vibration of benzenoid rings of PANI to COC symmetric vibrational modes of PEO confirmed that the PANI content in nanofiber mats increased proportionally with increase in PANI content in electrospinning solution. The band gap of PANI was determined to be 2.5 eV using UV‐Vis spectroscopy. The electrical conductivities of the nanofibers increased with an increase in the PANI content in the nanofibers. Additionally, the sensitivity toward NH3 increased as the PANI content increased, but branched nanofibers reduced sensing response. The humidity sensitivity changed from positive to negative as the PANI content increased. The electron transport mechanism was studied by measuring the temperature dependence electrical resistivity. The negative temperature coefficient of resistance revealed a semiconducting behavior for the PANI/PEO nanofibers. The activation energy, calculated by Arrhenius plot, increased as the PANI content decreased. The power law indicated that electrons were being transported in a three dimensional matrix, and the longer hopping distance required more hopping energy for electron transport.

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Nanofibrous PANI-based conductive polymers for trace gas analysis

Cited by 39 publications

References 28 publications

Tunable Enhancement of a Graphene/Polyaniline/Poly(ethylene oxide) Composite Electrospun Nanofiber Gas Sensor

Tunable Enhancement of a Graphene/Polyaniline/Poly(ethylene oxide) Composite Electrospun Nanofiber Gas Sensor

Associated Polymers, Solvents and Doping Agents to Make Polyaniline Electrospinnable

Electrospun Polyaniline/Poly(ethylene oxide) Composite Nanofibers Based Gas Sensor

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