Resistive type NO2 gas sensing in polymer-dispersed liquid crystals with functionalized-carbon nanotubes dopant at room temperature

Pasupuleti, Kedhareswara Sairam; Reddeppa, Maddaka; Ahn, Soyeon; Kim, Young Seo; Kim, Jong Hyun; Kim, Moon‐Deock; Lee, Seung Hee; Jeon, Min Yong

doi:10.1016/j.snb.2022.132482

Cited by 26 publications

(8 citation statements)

References 45 publications

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“…Due to their extraordinary mechanical properties, in particular, very high elastic modulus, and tensile strength, combined with a very small diameter, carbon nanotubes can reach natural frequencies of the order of THz. Based on these characteristics, they have been considered ideal candidates for several applications in high-sensitivity electromechanical devices such as resonators, sensors, and oscillators [35,36]. This important industrial applicability has prompted many researchers to focus their attention on the study of CNT vibrations [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Carbon Nanotubes on the Physical and Chemical Properties of Nanocomposites Based on Unsaturated Polyester Resin

Pączkowski,

Sigareva,

Gorelov

et al. 2023

Nanomaterials

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The new actual scientific direction is in the development of different nanocomposites and the study of their medical–biological, physicochemical, and physicomechanical properties. One way to expand the functionality of nanocomposites and nanomaterials is to introduce carbon nanostructures into the polymer matrix. This study presents the properties of unsaturated polyester resins (Estromal, LERG S.A.) based on PET recyclate with multi-walled carbon nanotubes (MWCNTs): their mechanical and thermomechanical characteristics, resistance to ultraviolet radiation (UV-vis), and chemical resistance properties. The properties of the obtained materials were characterized using physical–chemical research methods. The changes in the properties of the composites for MWCNT content of 0.1, 0.3, and 0.5 wt % were determined. The results showed positive influences on the thermomechanical and mechanical properties of nanocomposites without significant deterioration of their gloss. Too much CNT added to the resin leads to heterogeneity of the composite structure.

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Section: Introductionmentioning

confidence: 99%

The Influence of Carbon Nanotubes on the Physical and Chemical Properties of Nanocomposites Based on Unsaturated Polyester Resin

Pączkowski,

Sigareva,

Gorelov

et al. 2023

Nanomaterials

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“…During the previous decade, different sensing materials have been studied to develop high-performance gas sensors [ 1 , 2 , 3 ]. Among them, two-dimensional transition metal dichalcogenides (TMDs) nanostructured materials have gained attention as promising candidates for gas-sensing applications due to their unique electronic, optical, and mechanical properties [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Liquid Shear Exfoliation of MoS2: Preparation, Characterization, and NO2-Sensing Properties

Ni,

Dieng,

Vanel

et al. 2023

Nanomaterials

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2D materials possess great potential to serve as gas-sensing materials due to their large, specific surface areas and strong surface activities. Among this family, transition metal chalcogenide materials exhibit different properties and are promising candidates for a wide range of applications, including sensors, photodetectors, energy conversion, and energy storage. Herein, a high-shear mixing method has been used to produce multilayered MoS2 nanosheet dispersions. MoS2 thin films were manufactured by vacuum-assisted filtration. The structural morphology of MoS2 was studied using ς-potential, UV–visible, scanning electron microscopy (SEM), atomic force microscopy (AFM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray diffraction (XRD), and Raman spectroscopy (RS). The spectroscopic and microscopic analyses confirm the formation of a high-crystalline MoS2 thin film with good inter-sheet connectivity and relative thickness uniformity. The thickness of the MoS2 layer is measured to be approximately 250 nm, with a nanosheet size of 120 nm ± 40 nm and a number of layers between 6 and 9 layers. Moreover, the electrical characteristics clearly showed that the MoS2 thin film exhibits good conductivity and a linear I–V curve response, indicating good ohmic contact between the MoS2 film and the electrodes. As an example of applicability, we fabricated chemiresistive sensor devices with a MoS2 film as a sensing layer. The performance of the MoS2-chemiresistive sensor for NO2 was assessed by being exposed to different concentrations of NO2 (1 ppm to 10 ppm). This sensor shows a sensibility to low concentrations of 1 ppm, with a response time of 114 s and a recovery time of 420 s. The effect of thin-film thickness and operating temperatures on sensor response was studied. The results show that thinner film exhibits a higher response to NO2; the response decreases as the working temperature increases.

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“…Polymer/liquid crystal (LC) composites have attained significant attention in the recent past because of the burgeoning interest in their potential photoelectrical applications, such as switchable windows, microlenses, reflective displays, multicolor displays, light shutters, and sensors. − These composites are structurally divided into two types depending on the LC concentration: polymer-dispersed LC (PDLC) and polymer-stabilized LC (PSLC). , The former contains up to 80% LC content in the form of randomly oriented droplets dispersed in a phase-separated polymer framework. The latter, however, contains 90% or more LC content, and LC molecules are stabilized in the polymer network.…”

Section: Introductionmentioning

confidence: 99%

Reverse Mode Polymer-Stabilized Liquid Crystal Films via Thiol and Acrylic Azobenzene

Yun

Saeed

Kim

et al. 2023

ACS Appl. Polym. Mater.

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Reverse mode polymer-stabilized liquid crystal (RPSLC) have shown significant promise in energy-saving smart windows. However, to make them practical for widespread use, it is crucial to reduce the operating voltage and enhance the contrast ratio. Here, we introduce an approach to achieving these goals by using acrylic azobenzene, which serves as both a polymerizable monomer and dopant in RPSLC films fabricated using photopolymerization. The results showed that the polymer morphologies could be manipulated by varying the contents of liquid crystal and azobenzene, leading to significant improvements in the electro-optical (EO) properties of the RPSLC films. Particularly, great improvements in EO properties were realized by doping a 0.3 wt % azobenzene monomer, the threshold voltage was lowered from 18.2 to 11.5 V, and the contrast ratio was raised from 115.6 to 185.9. This work provides mechanistic insight to regulate the microstructure and optimize the EO properties of RPSLC films.

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Resistive type NO2 gas sensing in polymer-dispersed liquid crystals with functionalized-carbon nanotubes dopant at room temperature

Cited by 26 publications

References 45 publications

The Influence of Carbon Nanotubes on the Physical and Chemical Properties of Nanocomposites Based on Unsaturated Polyester Resin

The Influence of Carbon Nanotubes on the Physical and Chemical Properties of Nanocomposites Based on Unsaturated Polyester Resin

Liquid Shear Exfoliation of MoS2: Preparation, Characterization, and NO2-Sensing Properties

Reverse Mode Polymer-Stabilized Liquid Crystal Films via Thiol and Acrylic Azobenzene

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