Resistive Gas Sensors Based on MWCNTs-PVP Composite Films

In this paper, multiple-walled carbon nanotubes (MWCNTs) monolayer film and MWCNTs-polyvinylpyrrolidone (PVP) composite films were fabricated on interdigitated electrodes (IDEs) by airbrush technology, respectively. Response performance of all the sensors to various concentrations of vapors including methanol, ethanol, acetone, tetrahydrofuran, water and 1,2-dichloroethane were investigated. The results showed that a larger sensing response was obtained for the composite films compared with the MWCNTs monolayer film. Moreover, the MWCNTs-PVP composite films had a good selectivity for 1,2-dichloroethane vapor.

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Synthesis of silver nanoparticles embedded with single-walled carbon nanotubes for printable elastic electrodes and sensors with high stability

Scientific Reports ◽

10.1038/s41598-021-84386-4 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Jae-Won Lee ◽

Joon Young Cho ◽

Mi Jeong Kim ◽

Jung Hoon Kim ◽

Jong Hwan Park ◽

...

Keyword(s):

Carbon Nanotubes ◽

Silver Nanoparticles ◽

High Performance ◽

Composite Films ◽

Single Walled Carbon Nanotubes ◽

Gauge Factor ◽

Time Interval ◽

Single Walled Carbon ◽

Irradiation Energy ◽

Walled Carbon Nanotubes

AbstractSoft electronic devices that are bendable and stretchable require stretchable electric or electronic components. Nanostructured conducting materials or soft conducting polymers are one of the most promising fillers to achieve high performance and durability. Here, we report silver nanoparticles (AgNPs) embedded with single-walled carbon nanotubes (SWCNTs) synthesized in aqueous solutions at room temperature, using NaBH4 as a reducing agent in the presence of highly oxidized SWCNTs as efficient nucleation agents. Elastic composite films composed of the AgNPs-embedded SWCNTs, Ag flake, and polydimethylsiloxane are irradiated with radiation from a Xenon flash lamp within a time interval of one second for efficient sintering of conductive fillers. Under high irradiation energy, the stretchable electrodes are created with a maximum conductivity of 4,907 S cm−1 and a highly stretchable stability of over 10,000 cycles under a 20% strain. Moreover, under a low irradiation energy, strain sensors with a gauge factor of 76 under a 20% strain and 5.4 under a 5% strain are fabricated. For practical demonstration, the fabricated stretchable electrode and strain sensor are attached to a human finger for detecting the motions of the finger.

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The Effect of Nanotube Loading and Dispersion on the Three-Dimensional Nanostructure of Carbon Nanotube-Conducting Polymer Composite Films

MRS Proceedings ◽

10.1557/proc-739-h5.3 ◽

2002 ◽

Vol 739 ◽

Cited By ~ 1

Author(s):

Mark Hughes ◽

George Z. Chen ◽

Milo S. P. Shaffer ◽

Derek J. Fray ◽

Alan H. Windle

Keyword(s):

Carbon Nanotubes ◽

Carbon Nanotube ◽

Conducting Polymer ◽

Polymer Composite ◽

Electrochemical Polymerization ◽

Composite Films ◽

Three Dimensional ◽

Ionic Diffusion ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

ABSTRACTNanoporous composite films of multi-walled carbon nanotubes (MWNTs) and either polypyrrole (PPy) or poly(3-methylthiophene) (P3MeT) were grown using an electrochemical polymerization technique in which the nanotubes and conducting polymer were deposited simultaneously. The concentration and dispersion of MWNTs in the polymerization electrolyte was found to have a significant effect on the thickness of polymer coated on each MWNT and hence the loading of MWNTs in the films produced. It has been shown that for an increasing concentration of MWNTs in the polymerization electrolyte, the thickness of polymer coated on each MWNT decreases. This relationship made it possible to minimize ionic diffusion distances within the nanoporous MWNT-PPy films produced, reducing their electrical and ionic resistance and increasing their capacitance relative to similarly prepared pure PPy films.

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Enhancing the Thermoelectric Performance through the Mutual Interaction between Conjugated Polyelectrolytes and Single-walled Carbon Nanotubes

Chinese Physics B ◽

10.1088/1674-1056/ac48f9 ◽

2022 ◽

Author(s):

Shuxun Wan ◽

Zhongming Chen ◽

Liping Hao ◽

Shichao Wang ◽

Benzhang Li ◽

...

Keyword(s):

Carbon Nanotubes ◽

Thermoelectric Properties ◽

Thermoelectric Generator ◽

Composite Films ◽

Single Walled Carbon Nanotubes ◽

Conjugated Polyelectrolytes ◽

High Performing ◽

Single Walled Carbon ◽

Electrical Conductivities ◽

Walled Carbon Nanotubes

Abstract We present a method of constructing composites composed of conjugated polyelectrolytes (CPEs) and single-walled carbon nanotubes (SWCNTs) to obtain a high-performing flexible thermoelectric generator. In this approach, three kinds of polymers, namely, poly[(1,4-(2,5-didodecyloxybenzene)-alt-2,5-thiophene] (P1), poly[(1,4-(2,5-bis-sodium butoxysulfonate-phenylene)-alt-2,5-thiophene] (P2), and poly[(1,4-(2,5-bis-acid butoxysulfonic-phenylene)-alt-2,5-thiophene] (P3) are designed, synthesized and complexed with SWCNTs as thermoelectric composites. The electrical conductivities of CPEs/SWCNTs (P2/SWCNTs, and P3/SWCNTs) nanocomposites are much higher than those of non-CPEs/SWCNTs (P1/SWCNTs) nanocomposites. Among them, the electrical conductivity of P2/SWCNTs with a ratio of 1:4 reaches 3686 S cm-1, which is 12.4 times that of P1/SWCNTs at the same SWCNT mass ratio. Moreover, CPEs/SWCNTs composites (P2/SWCNTs) display remarkably improved thermoelectric properties with the highest power factor (PF) of 163 μW m-1 K-2. In addition, a thermoelectric generator is fabricated with P2/SWCNTs composite films, and the output power and power density of this generator reach 1.37 μW and 1.4 W m-2 (cross-section) at ΔT=70 K. This result is over three times that of the thermoelectric generator composed of non-CPEs/SWCNTs composite films (P1/SWCNTs, 0.37 μW). The remarkably improved electrical conductivities and thermoelectric properties of the CPEs/SWCNTs composites (P2/SWCNTs) are attributed to the enhanced interaction. This method for constructing CPEs/SWCNTs composites can be applied to produce thermoelectric materials and devices.

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Preparation and Thermoelectric Properties of Semiconducting Single-Walled Carbon Nanotubes/Regioregular Poly(3-dodecylthiophene) Composite Films

Polymers ◽

10.3390/polym12112720 ◽

2020 ◽

Vol 12 (11) ◽

pp. 2720

Author(s):

Mengdi Wang ◽

Qin Yao ◽

Sanyin Qu ◽

Yanling Chen ◽

Hui Li ◽

...

Keyword(s):

Carbon Nanotubes ◽

Transport Properties ◽

Thermoelectric Properties ◽

Composite Films ◽

Single Walled Carbon Nanotubes ◽

Dispersion Phase ◽

Single Walled Carbon ◽

Seebeck Coefficients ◽

Regioregular Poly ◽

Walled Carbon Nanotubes

Single-walled carbon nanotubes (SWNTs) have been widely used as leading additives for improving the thermoelectric properties of organic materials, due to their unique structure and excellent electronic transport properties. However, the as-synthesized SWNTs are mixtures (mix-SWNT) of semiconducting (sc-SWNT) and metallic (met-SWNT) carbon nanotubes. The significantly different surface character and transport behavior of sc-SWNT and met-SWNT frequently raise the difficulty of modifying microstructures, and tuning transport properties of SWNTs/organic composites, when using mix-SWNTs as dispersion phase. Herein, we prepared high quality sc-SWNTs/rr-P3DDT composite film by presorting pure sc-SWNT from the raw mix-SWNTs using regioregular poly(3-dodecylthiophene) (rr-P3DDT). Both the smoothness and compactness of sc-SWNTs/rr-P3DDT are great improved, as compared with the mix-SWNTs/rr-P3DDT films, and the sc-SWNTs are well-dispersed and uniformly wrapped by rr-P3DDT with diameter less than 50 nm. The significantly enhanced Seebeck coefficients and power factors are obtained in the sc-SWNT/rr-P3DDT samples. As the result, the maximum power factor of 60 μW/mK2 in 50 wt% sc-SWNTs sample is 70% higher than that of mix-SWNTs/P3DDT sample. This work reveals the effectiveness of pure semiconductor SWNTs as fillers to optimize the thermoelectric properties of CNT/polymer nano-composites.

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Electrodeposition of Sn and Sn Composites with Carbon Materials Using Choline Chloride-Based Ionic Liquids

Coatings ◽

10.3390/coatings9120798 ◽

2019 ◽

Vol 9 (12) ◽

pp. 798

Author(s):

Ana T. S. C. Brandão ◽

Liana Anicai ◽

Oana Andreea Lazar ◽

Sabrina Rosoiu ◽

Aida Pantazi ◽

...

Keyword(s):

Carbon Nanotubes ◽

Carbon Materials ◽

Electrochemical Impedance ◽

Choline Chloride ◽

Composite Films ◽

Growth Stages ◽

Initial Growth ◽

Sem Images ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Nano carbons, such as graphene and carbon nanotubes, show very interesting electrochemical properties and are becoming a focus of interest in many areas, including electrodeposition of carbon–metal composites for battery application. The aim of this study was to incorporate carbon materials (namely oxidized multi-walled carbon nanotubes (ox-MWCNT), pristine multi-walled carbon nanotubes (P-MWCNT), and reduced graphene oxide (rGO)) into a metallic tin matrix. Formation of the carbon–tin composite materials was achieved by electrodeposition from a choline chloride-based ionic solvent. The different structures and treatments of the carbon materials will create metallic composites with different characteristics. The electrochemical characterization of Sn and Sn composites was performed using chronoamperometry, potentiometry, electrochemical impedance, and cyclic voltammetry. The initial growth stages of Sn and Sn composites were characterized by a glassy-carbon (GC) electrode surface. Nucleation studies were carried out, and the effect of the carbon materials was characterized using the Scharifker and Hills (SH) and Scharifker and Mostany (SM) models. Through a non-linear fitting method, it was shown that the nucleation of Sn and Sn composites on a GC surface occurred through a 3D instantaneous process with growth controlled by diffusion. According to Raman and XRD analysis, carbon materials were successfully incorporated at the Sn matrix. AFM and SEM images showed that the carbon incorporation influences the coverage of the surface as well as the size and shape of the agglomerate. From the analysis of the corrosion tests, it is possible to say that Sn-composite films exhibit a comparable or slightly better corrosion performance as compared to pure Sn films.

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pH-Switchable electroactive composite films of carboxylated multi-walled carbon nanotubes and Prussian blue

RSC Advances ◽

10.1039/c5ra21751b ◽

2015 ◽

Vol 5 (125) ◽

pp. 103184-103188

Author(s):

Ying Tong ◽

Yuanyuan Wang ◽

Bowen Gao ◽

Lei Su ◽

Xueji Zhang

Keyword(s):

Thin Films ◽

Carbon Nanotubes ◽

Prussian Blue ◽

Composite Films ◽

Ph Responsive ◽

Composite Thin Films ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Here the combination of carboxylated multi-walled carbon nanotubes (CMWCNTs) and Prussian blue (PB) for fabricating pH-responsive electroactive composite thin films is reported.

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