A Flexible, Highly Sensitive, and Selective Chemiresistive Gas Sensor Obtained by In Situ Photopolymerization of an Acrylic Resin in the Presence of MWCNTs

Vigna, Lorenzo; Fasoli, Andrea; Cocuzza, Matteo; Pirri, Fabrizio; Bozano, Luisa; Sangermano, Marco

doi:10.1002/mame.201800453

Cited by 14 publications

(9 citation statements)

References 39 publications

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“…In the case of acetone, although it has a lower polarity than ethanol and IPA, its higher response can be explained by its better affinity to the DPP-DTT polymer surface. This trend of the affinity can be reasonably explained on the basis of Hansen solubility parameters (HSPs), which are defined as empirical values of the hydrogen-bonding cohesion force, dipole cohesion force, and dispersion cohesion force. − The better responsivity of the DPP-DTT OFET sensor to acetone over ethanol has been also demonstrated in the reported research . In comparison with previously reported VOC sensors (Table ), the sensing performance of the as-prepared and optimized DPP-DTT sensor is far superior, with a higher response value and a lower detection limit.…”

Section: Resultssupporting

confidence: 60%

Design and Fabrication of Ultrathin Nanoporous Donor–Acceptor Copolymer-Based Organic Field-Effect Transistors for Enhanced VOC Sensing Performance

Tran

Jeong

et al. 2023

ACS Appl. Mater. Interfaces

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The development of organic field-effect transistor (OFET) chemical sensors with high sensing performance and good air stability has remained a persistent challenge, thereby hindering their practical application. Herein, an OFET sensor based on a donor–acceptor copolymer is shown to provide high responsivity, sensitivity, and selectivity toward polar volatile organic compounds, as well as good air stability. In detail, a polymer blend of N-alkyl-diketopyrrolo-pyrrole-dithienylthieno[3,2-b]thiophene (DPP-DTT) and polystyrene is coated onto an FET substrate via shearing-assisted phase separation (SAPS) combined with selective solvent etching to fabricate the DPP-DTT-based OFET device having an ultrathin nanoporous structure suitable for gas sensing applications. This is achieved via optimization of the film morphology by varying the shear rate to adjust the dynamic balance between the shear and capillary forces to obtain an ultrathin thickness (∼8 nm) and nanopore size (80 nm) that are favorable for the efficient diffusion and interaction of analytes with the active layer. In particular, the sensor presents high responsivities toward methanol (∼70%), acetone (∼51.3%), ethanol (∼39%), and isopropyl alcohol (IPA) (∼29.8%), along with fast response and recovery times of ∼80 and 234 s, respectively. Moreover, the average sensitivity was determined to be 5.75%/ppm from the linear plot of the responsivity against the methanol concentration in the range of 1–100 ppm. Importantly, the device also exhibits excellent long-term (30-day) air and thermal storage stability, thereby demonstrating its high potential for practical applications.

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Section: Resultssupporting

confidence: 60%

Design and Fabrication of Ultrathin Nanoporous Donor–Acceptor Copolymer-Based Organic Field-Effect Transistors for Enhanced VOC Sensing Performance

Tran

Jeong

et al. 2023

ACS Appl. Mater. Interfaces

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“…Among all of the contaminants in air, volatile organic compounds (VOCs) such as acetone, ethanol, and ammonia vapors are the most common and hazardous. Even at very low concentrations these molecules not only pollute the environment, but also directly affect human health and climate change. ,, Commercial gas sensors are based on different transduction mechanisms and materials, which include polymers, − metal oxides, − or nanocomposites. ,,− The most common are the ones based on metal oxide semiconductors, which require high working temperatures to obtain good sensitivities, fast response, and selectivity. ,, Morandi et al fabricated a CH 4 sensor using Pt/Zn/Al-LDH operating at 450 °C . This entails an increase in power consumption and device complexities, and it is unfavorable for device stability and flammable or explosive environments.…”

Section: Introductionmentioning

confidence: 99%

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

et al. 2021

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Miniaturized low-cost sensors for volatile organic compounds (VOCs) have the potentiality to become a fundamental tool for indoor and outdoor air quality monitoring, to significantly improve everyday life. Layered double hydroxides (LDHs) belong to the class of anionic clays and are largely employed for NO x detection, while few results are reported on VOCs. In this work, a novel LDH coprecipitation method is proposed. For the first time, a study comparing four LDHs (ZnAl−Cl, ZnFe−Cl, ZnAl− NO 3 , and MgAl−NO 3 ) is carried out to investigate the sensing performances. As explored through several microscopy and spectroscopy analyses, LDHs show a morphology characterized by a large surface area and a three-dimensional hierarchical flowerlike architecture with micro-and nanopores that induce a fast diffusion and highly effective surface interaction of the target gases. The fabricated sensors, operating at room temperature, are able to reversibly and selectively detect acetone, ethanol, ammonia, and chlorine vapors, reaching significant sensing response values up to 6% at 21 °C. The results demonstrate that by changing the LDHs' composition, it is possible to modulate the sensitivity and selectivity of the sensor, helping the discrimination of different analytes, and the consequent integration on a sensor array paves the way for electronic nose development.

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“…In situ photopolymerization of polymer-rich systems drive the fabrication of nanocomposites and nanocomposite gels, anisotropic particles, solid-state solar cells, electrodes for solar cells and supercapacitors, ionic-liquid-rich gel electrolyte, flexible broadband mirrors, gas sensors, , core–shell and hybrid nanofibers, monoliths for protein separation, functional biomaterial microstructures, customized nanoparticles and hydrogels for various applications, − and many more. The process of 3D printing with polymer inks has been extensively employing such in situ polymerization ( in situ curing) of deposited and spreading polymer drops and traces. − Such in situ curing of the printed polymer traces significantly enhances the rate of 3D printing.…”

Section: Introductionmentioning

confidence: 99%

3D Printed Microdroplet Curing: Unravelling the Physics of On-Spot Photopolymerization

Sivasankar

Sachar

Sinha

et al. 2020

ACS Appl. Polym. Mater.

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Droplet-based direct-write printing (one form of 3D printing) methods, like inkjet printing, aerosol jet printing (AJP), etc., have changed our ideas about bottom-up additive manufacturing. AJP is capable of 3D printing by depositing microdroplets that lead to certain benefits in 3D printing of microscale structures. Here, we study the in situ photopolymerization-based curing of a microdroplet. The droplet is simultaneously spreading and curing, which leads to the rise of two time scales, the spreading time scale (τs) and the photopolymerization time scale (τp). When τs ≪ τp, the spreading occurs very fast and is independent of polymerization. If the time scales are of the same order (τs ∼ τp), the spreading is significantly affected by the polymerization. For this case, a progressive increase in the viscosity of the drop during the spreading ensures a much slower spreading and also a much weaker extent of spreading (i.e., the spreading ceases at a much smaller spreading radius of the drop). This complex thermofluidics is eventually manifested as distinct differences in the time-dependent velocity, temperature, and curing (or equivalently, monomer concentration) profiles within the drop between the two cases.

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A Flexible, Highly Sensitive, and Selective Chemiresistive Gas Sensor Obtained by In Situ Photopolymerization of an Acrylic Resin in the Presence of MWCNTs

Cited by 14 publications

References 39 publications

Design and Fabrication of Ultrathin Nanoporous Donor–Acceptor Copolymer-Based Organic Field-Effect Transistors for Enhanced VOC Sensing Performance

Design and Fabrication of Ultrathin Nanoporous Donor–Acceptor Copolymer-Based Organic Field-Effect Transistors for Enhanced VOC Sensing Performance

Layered Double Hydroxide-Based Gas Sensors for VOC Detection at Room Temperature

3D Printed Microdroplet Curing: Unravelling the Physics of On-Spot Photopolymerization

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