Gas sensor for ammonia detection based on poly(vinyl alcohol) and polyaniline electrospun

Bittencourt, Jéssyka Carolina; Gois, Bruno Henrique de Santana; Oliveira, Vinícius Jessé Rodrigues de; Agostini, Deuber Lincon da Silva; Olivati, Clarissa de Almeida

doi:10.1002/app.47288

Cited by 42 publications

(22 citation statements)

References 37 publications

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“…33−35 Nonetheless, for the ammonia gas sensor in our case, we decided to select polyvinyl acetate (PVAc) as a carrier polymer mainly because of its hydrophobic characteristic, which is beneficial to repel the water molecules and subsequently minimize possible interference by the humidity effect. 36,37 Moreover, to increase sensor sensitivity and selectivity to ammonia, the specific dopants were repeatedly introduced to the precursor materials. 38,39 Doping materials (e.g., graphene oxide (GO), magnetite, copper nanoparticle, and bromocresol green) have been demonstrated to be able to increase the polymer-based ammonia detection capabilities.…”

Section: Introductionmentioning

confidence: 99%

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

Roto

Rianjanu

Rahmawati

et al. 2020

ACS Appl. Nano Mater.

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We fabricated highly sensitive and selective ammonia gas sensors based on quartz crystal microbalance (QCM) platforms that were functionalized with electrospun polyvinyl acetate (PVAc) nanofibers and doped with various organic acids (i.e., oxalic, tartaric, and citric acids). The structural and chemical surface conditions of the nanofiber-based active layers on top of the QCMs were confirmed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and Fourier-transform infrared (FTIR) spectroscopy. The sensitivity of the PVAc nanofiber-based QCM sensor doped with citric acid was found to be the highest (2.95 Hz/ppm) among others with a limit of detection (LOD) of down to the subppm level (550 ppb). It also exhibited good selectivity, rapid response, short recovery time, and decent repeatability. This simple yet low-cost alternative solution based on chemical modification of nanofibers could improve the performance of QCM-based ammonia gas sensors in many areas including for smart electronic nose applications.

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Section: Introductionmentioning

confidence: 99%

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

Roto

Rianjanu

Rahmawati

et al. 2020

ACS Appl. Nano Mater.

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“…Blending them with spinning agents is one possibility to prepare conductive nanofiber mats from such conductive polymers [31]. Bittencourt et al, e.g., used electrospinning from different PVA/polyaniline (PAni) solutions with de-doped PAni, resulting in nanofiber mats with conductivities around 35 nS/m which was sufficient for the use as ammonia gas sensor [32].…”

Section: Electrospinning From Conductive Solutions or Meltsmentioning

confidence: 99%

Conductive Electrospun Nanofiber Mats

Błachowicz

Ehrmann

2019

Materials

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Conductive nanofiber mats can be used in a broad variety of applications, such as electromagnetic shielding, sensors, multifunctional textile surfaces, organic photovoltaics, or biomedicine. While nanofibers or nanofiber from pure or blended polymers can in many cases unambiguously be prepared by electrospinning, creating conductive nanofibers is often more challenging. Integration of conductive nano-fillers often needs a calcination step to evaporate the non-conductive polymer matrix which is necessary for the electrospinning process, while conductive polymers have often relatively low molecular weights and are hard to dissolve in common solvents, both factors impeding spinning them solely and making a spinning agent necessary. On the other hand, conductive coatings may disturb the desired porous structure and possibly cause problems with biocompatibility or other necessary properties of the original nanofiber mats. Here we give an overview of the most recent developments in the growing field of conductive electrospun nanofiber mats, based on electrospinning blends of spinning agents with conductive polymers or nanoparticles, alternatively applying conductive coatings, and the possible applications of such conductive electrospun nanofiber mats.

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“…Recently, conductive conjugated polymers on flexible substrate are in fashion as sensing materials for trace-level detection of ammonia owing to their lightweight, flexible, and portable nature [ 4 ]. These type of ammonia sensors are widely reported due to their simple synthesis, ambient temperature sensitivity and low cost processing [ 5 , 6 , 7 , 8 ]. In this context, polyaniline (PAni) is one of the most significant conducting polymers used for ammonia sensing because of its high reactivity and facile synthesis [ 9 ] along with its reversible doping/dedoping property [ 10 ], excellent electrical properties, unique redox characteristics and adjustable sensing at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

A Novel Trace-Level Ammonia Gas Sensing Based on Flexible PAni-CoFe2O4 Nanocomposite Film at Room Temperature

Alharthy

Saleh

2021

Polymers

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In this study, we developed a new chemi-resistive, flexible and selective ammonia (NH3) gas sensor. The sensor was prepared by depositing thin film of polyaniline-cobalt ferrite (PAni-CoFe2O4) nanocomposite on flexible polyethylene terephthalate (PET) through an in situ chemical oxidative polymerization method. The prepared PAni-CoFe2O4 nanocomposite and flexible PET-PAni-CoFe2O4 sensor were evaluated for their thermal stability, surface morphology and materials composition. The response to NH3 gas of the developed sensor was examined thoroughly in the range of 1–50 ppm at room temperature. The sensor with 50 wt% CoFe2O4 NPs content showed an optimum selectivity to NH3 molecules, with a 118.3% response towards 50 ppm in 24.3 s response time. Furthermore, the sensor showed good reproducibility, ultra-low detection limit (25 ppb) and excellent flexibility. In addition, the relative humidity effect on the sensor performance was investigated. Consequently, the flexible PET-PAni-CoFe2O4 sensor is a promising candidate for trace-level on-site sensing of NH3 in wearable electronic or portable devices.

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Gas sensor for ammonia detection based on poly(vinyl alcohol) and polyaniline electrospun

Cited by 42 publications

References 37 publications

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

Quartz Crystal Microbalances Functionalized with Citric Acid-Doped Polyvinyl Acetate Nanofibers for Ammonia Sensing

Conductive Electrospun Nanofiber Mats

A Novel Trace-Level Ammonia Gas Sensing Based on Flexible PAni-CoFe2O4 Nanocomposite Film at Room Temperature

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