Tailoring the Diameters of Polyaniline Nanofibers for Sensor Application

Erden, Fuat; Lai, Szu Cheng; Wang, Fuke; He, Chaobin

doi:10.1021/acsomega.7b00544

Cited by 17 publications

(8 citation statements)

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“…PANI is able to self-assemble into nanostructures [ 11 ], such as nanoparticles [ 12 ], nanotubes [ 13 ], nanofibers [ 14 ], nanowires [ 15 ], nanosheets [ 16 ], and networks [ 17 ]. The studies of these constructs have revealed that the electrical properties can be tuned by changing the dimensionality of the nanostructures [ 18 , 19 ]. PANI is synthesized via electrochemical or chemical oxidation of its monomer (aniline—ANI) in an aqueous acidic solution [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Impact of Acidity Profile on Nascent Polyaniline in the Modified Rapid Mixing Process—Material Electrical Conductivity and Morphological Study

et al. 2020

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Polyaniline (PANI) was synthesized chemically with the modified rapid mixing protocol in the presence of sulfuric acid of various concentrations. A two-step synthetic procedure was utilized maintaining low-temperature conditions. Application of the modified rapid mixing protocol allowed obtaining a material with local ordering. A higher concentration of acid allowed obtaining a higher yield of the reaction. Structural characterization performed with Fourier-transform infrared (FTIR) analysis showed the vibration bands characteristic of the formation of the emeraldine salt in both products. Ultraviolet–visible light (UV–Vis) spectroscopy was used for the polaronic band and the p–p* band determination. The absorption result served to estimate the average oxidation level of PANI by comparison of the ratio of the absorbance of the polaronic band to that of the π–π* transition. The absorbance ratio index was higher for PANI synthesized in a more acidic solution, which showed a higher doping level for this polymer. For final powder products, particle size distributions were also estimated, proving that PANI (5.0 M) is characterized by a larger number of small particles; however, these particles can more easily agglomerate and form larger structures. The X-ray diffraction (XRD) patterns revealed an equilibrium between the amorphous and semicrystalline phase in the doped PANI. A higher electrical conductivity value was measured for polymer synthesized in a higher acid concentration. The time-of-flight secondary ion mass spectrometry (TOF-SIMS) analysis showed that the molecular composition of the polymers was the same; hence, the difference in properties was a result of local ordering.

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Section: Introductionmentioning

confidence: 99%

Impact of Acidity Profile on Nascent Polyaniline in the Modified Rapid Mixing Process—Material Electrical Conductivity and Morphological Study

et al. 2020

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“…However, the peak is also seen in PSt microspheres and is reported as a typical XRD feature of amorphous PSt [41]. Crystallized PANI is known to have a sharp peak at 2θ = 25.6 • , which is derived from the periodicity perpendicular to the PANI polymer chains [42,43]. The corresponding peak was seen in both PANI microspheres, indicating the semi-crystalline phase.…”

Section: Characterization Of the Core-shell Type Of Polyaniline Microspheresmentioning

confidence: 84%

A Highly Sensitive Ammonia Gas Sensor Using Micrometer-Sized Core–Shell-Type Spherical Polyaniline Particles

Matsuguchi

Nakamae

Fujisada

et al. 2021

Sensors

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A highly sensitive NH3 gas sensor based on micrometer-sized polyaniline (PANI) spheres was successfully fabricated. The PANI microspheres were prepared via a facile in situ chemical oxidation polymerization in a polystyrene microsphere dispersion solution, resulting in a core–shell structure. The sensor response increased as the diameter of the microspheres increased. The PSt@PANI(4.5) sensor, which had microspheres with a 4.5 μm average diameter, showed the largest response value of 77 for 100 ppm dry NH3 gas at 30 °C, which was 20 times that of the PANI-deposited film-based sensor. Even considering measurement error, the calculated detection limit was 46 ppb. A possible reason for why high sensitivity was achieved is simply the use of micrometer-sized PANI spherical particles. This research succeeded in providing a new and simple technology for developing a high-sensitivity NH3 gas sensor that operates at room temperature.

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“…Because of their exceptional characteristics, such as adjustable optoelectronic capabilities and large surface-to-volume ratios, they have a wide range of potential applications in batteries, supercapacitors, and chemical sensors. [24]. Polyaniline (PANI) is a conductive polymer applied in gas sensors due to its simple preparation, low cost, high electrical conductivity, fast response, excellent reproducibility, and good stability [25,26].…”

Section: Introductionmentioning

confidence: 99%

Reversible room temperature ammonia sensor based on the synthesized MoS₂/PANI nanocomposites

Ghaleghafi¹,

Rahmani²

2023

Phys. Scr.

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Successful fabrication and optimization of molybdenum disulfide (MoS2)/polyaniline (PANI) nanocomposite-based room temperature ammonia sensors have been reported in this work. The hydrothermal technique was used to synthesize nanocomposites of MoS2 and PANI at different amounts of PANI. For this, the precursor values were changed by choosing three different values of 0.65 (MP1), 1.1 (MP2), and 2.2 (MP3) for the ammonium heptamolybdate/PANI weight ratio. Successful fabrication of nanocomposites was confirmed by Raman analysis and X-ray diffraction. According to FESEM images, MoS2/PANI nanocomposites have been composed of 1D-PANI nanofibers covered by 2D-MoS2 nanosheets and created a porous morphology that influenced their sensing characteristics significantly. The samples’ ability to detect ammonia at room temperature was examined by fabricating sensor devices using the synthesized MoS2, PANI, and nanocomposites. The fabricated sensor using MP2 showed much better gas-sensing properties than other samples. This sensor showed about 4.6 and 1.6 times higher response than pristine PANI and MoS2 sensors for 10 ppm of ammonia, respectively, with better selectivity toward ammonia than other gas species. This research shows that compositing PANI with MoS2 significantly improves the gas detection performance of MoS2.

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Tailoring the Diameters of Polyaniline Nanofibers for Sensor Application

Cited by 17 publications

References 50 publications

Impact of Acidity Profile on Nascent Polyaniline in the Modified Rapid Mixing Process—Material Electrical Conductivity and Morphological Study

Impact of Acidity Profile on Nascent Polyaniline in the Modified Rapid Mixing Process—Material Electrical Conductivity and Morphological Study

A Highly Sensitive Ammonia Gas Sensor Using Micrometer-Sized Core–Shell-Type Spherical Polyaniline Particles

Reversible room temperature ammonia sensor based on the synthesized MoS₂/PANI nanocomposites

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Tailoring the Diameters of Polyaniline Nanofibers for Sensor Application

Cited by 17 publications

References 50 publications

Impact of Acidity Profile on Nascent Polyaniline in the Modified Rapid Mixing Process—Material Electrical Conductivity and Morphological Study

Impact of Acidity Profile on Nascent Polyaniline in the Modified Rapid Mixing Process—Material Electrical Conductivity and Morphological Study

A Highly Sensitive Ammonia Gas Sensor Using Micrometer-Sized Core–Shell-Type Spherical Polyaniline Particles

Reversible room temperature ammonia sensor based on the synthesized MoS2/PANI nanocomposites

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Product

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Reversible room temperature ammonia sensor based on the synthesized MoS₂/PANI nanocomposites