Analysis of sensing properties of thermoelectric vapor sensor made of carbon nanotubes/ethylene-octene copolymer composites

Slobodian, Petr; Riha, Pavel; Olejník, Robert; Benlikaya, Ruhan

doi:10.1016/j.carbon.2016.09.023

Cited by 19 publications

(16 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was also confirmed independently that the curing of melamine-formaldehyde resin in the presence of the COOH-functionalized MWCNTs was affected by amine groups [26]. X-ray photoelectron spectroscopy (XPS) signals were measured to obtain information on functional groups attached to the nanotube surfaces [24]. The signals from MWCNTs were recorded by the Thermo Scientific K-Alpha XPS system (Thermo Fisher Scientific, UK) equipped with a micro-focused, monochromatic Al Kα X-ray source (1486.6 eV).…”

Section: Resultsmentioning

confidence: 80%

“…The epoxy contains less free unbounded poly(propylene glycol) branches, resulting in resistance against conformation changes, stiffness, and a higher T g . The epoxy curing in the presence of MWCNTs, which have oxygenated functional groups on their surface [24], increases epoxy matrix rigidity since the amine groups link to the carboxylic groups attached to the nanotubes, forming imide covalent bonds [25]. It was also confirmed independently that the curing of melamine-formaldehyde resin in the presence of the COOH-functionalized MWCNTs was affected by amine groups [26].…”

Section: Resultsmentioning

confidence: 81%

“…X-ray photoelectron spectroscopy (XPS) signals were measured to obtain information on functional groups attached to the nanotube surfaces [24]. The signals from MWCNTs were recorded by the Thermo Scientific K-Alpha XPS system (Thermo Fisher Scientific, UK) equipped with a microfocused, monochromatic Al K X  -ray source (1486.6 eV).…”

Section: Resultsmentioning

confidence: 99%

“…We combined a multi-walled carbon nanotube free-standing nanopaper and an epoxy resin into a reinforced thermosetting polymer matrix composite and demonstrated its versatile use in technological processes with advanced processing parameters, thus saving time and electrical energy. In our earlier papers [20,21,24], the nanopaper was introduced individually or embedded in thermoplastic polymers as a multifunctional sensor of ambient vapors or of a tensile and compressive stress. The nanopaper has been used as a built-in sensor in a glass fiber/epoxy composite to primarily measure composite deformation, as well to monitor epoxy resin infusion into layered glass fiber textiles and, subsequent curing process [1].…”

Section: Discussionmentioning

confidence: 99%

See 3 more Smart Citations

Accelerated Shape Forming and Recovering, Induction, and Release of Adhesiveness of Conductive Carbon Nanotube/Epoxy Composites by Joule Heating

et al. 2020

Self Cite

View full text Add to dashboard Cite

The versatile properties of a nanopaper consisting of a porous network of multi-walled carbon nanotubes were applied to enhance the mechanical and electrical properties of a thermosetting epoxy polymer. The embedded nanopaper proved useful both in the monitoring of the curing process of the epoxy resin by the self-regulating Joule heating and in the supervising of tensile deformations of the composite by detecting changes in its electrical resistance. When heated by Joule heating above its glass transition temperature, the embedded carbon nanotube nanopaper accelerated not only the modelling of the composites into various shapes, but also the shape recovery process, wherein the stress in the nanopaper was released and the shape of the composite reverted to its original configuration. Lastly, in comparison with its respective epoxy adhesive, the internally heated electro-conductive carbon nanotube nanopaper/epoxy composite not only substantially shortened curing time while retaining comparable strength of the adhesive bonding of the steel surfaces, but also enabled a release of such bonds by repeated application of DC current.

show abstract

Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Accelerated Shape Forming and Recovering, Induction, and Release of Adhesiveness of Conductive Carbon Nanotube/Epoxy Composites by Joule Heating

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thermoplastics such as polyolefin class polymers, polycarbonate, polyethylene terephthalate, and other similar matrices are used for the development of conductive and semi‐conductive nanocomposites with carbonaceous nanofillers due to low costs and good procession characteristics, and properties of such polymer materials . The metallocene‐based ENGAGE™ ethylene–octene copolymers (EOCs) are one of the recently tested thermoplastic elastomers in the development of gas sensors, strain sensors and other advanced materials based on composites with MWCNTs . Several studies have recently indicated the advantages of covalent and noncovalent functionalization of MWCNTs and other nano‐scale carbonaceous materials in order to enhance the dispersion of nanofillers in polymer matrices and to improve their physical and mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

Improvement of mechanical and dielectric properties of ethylene–octene copolymer by multi‐walled carbon nanotubes functionalized with poly(2,2′‐bithiophene)

et al. 2019

View full text Add to dashboard Cite

In this study, Baytube™ multi-walled carbon nanotubes (MWCNTs) were in situ modified by graft-polymerized 2,2 0 -bithiophene. The obtained PBT-g-MWCNTs were used as fillers for the development of semi-conductive nanocomposites with ethylene-octene copolymer (EOC, ENGAGE™ 8540). The methods of infrared and Raman spectroscopy, thermogravimetric analysis, and transmission electron microscopy were used to characterize the filler materials. Composite specimens with neat MWCNTs and PBT-g-MWCNTs at their contents of 3, 5, and 10 wt% were made by ultra-sound assisted master batching method and their mechanical and dielectric properties were compared. The strength properties (storage modulus, tensile strength) and the elongation at break of the composites with high contents (> 3 wt%) of PBT-g-MWCNTs were notably improved comparing to EOC/MWCNT composites. A notable improvement by more than two orders of magnitude of EOC conductivity was determined at 10 wt% content of PBT-g-MWCNT compared to that of pristine MWCNTs used as the composite nanofiller. POLYM. COMPOS., 40:3971-3980, 2019. POLYMER COMPOSITES-2019FIG. 7. The storage modulus (a), loss modulus (b), and damping factor (c) of pristine EOC and EOC composites as a function of temperature.

show abstract

Flexible and Stretchable Self‐Powered Multi‐Sensors Based on the N‐Type Thermoelectric Response of Polyurethane/Na_x(Ni‐ett)_n Composites

Wan

Taroni

Liu

et al. 2019

Adv Elect Materials

View full text Add to dashboard Cite

high demand, especially when characterized by flexibility, extensibility, durability, and low costs. Examples of such devices include health monitoring devices, [1] soft robotics, [2] and functional artificial skin. [3] Although the technology has greatly improved since the first modern applications over a century ago, most sensors are still powered by batteries, limiting their reliability and sustainability. In cases like continuous monitoring, off-the-grid, and maintenance-free applications, self-powered sensors would be extremely desirable.Toward this aim, several energy harvesting strategies have been explored, based on triboelectricity, [4] piezoelectricity, [5] pyroelectricity, [6] and others. [7] Among these, thermoelectricity is recognized as a very reliable and durable potential energy harvesting phenomenon for self-powered sensors [8] exploiting temperature gradients found ubiquitously. Since its discovery in the early 1800s, the thermoelectric (TE) effect has been used only in niche applications due to the relative low efficiencies, [9] high processing costs, toxicity, and rarity of some of the elements (e.g., tellurium, bismuth, antimony) currently used in the manufacture of commercial devices. Nevertheless, there has been a recent renewed interest in TE technology due both to the discovery of new materials and to new applications, in conjunction with solar cells, [10] supercapacitors, [11] and gating transistors. [12] Flexible and stretchable electronic devices have a broad range of potential uses, from biomedicine, soft robotics, and health monitoring to the internetof-things. Unfortunately, finding a robust and reliable power source remains challenging, particularly in off-the-grid and maintenance-free applications. A sought-after development overcome this challenge is the development of autonomous, self-powered devices. A potential solution is reported exploiting a promising n-type thermoelectric compound, poly nickel-ethenetetrathiolates (Na x (Ni-ett) n ). Highly stretchable n-type composite films are obtained by combining Na x (Ni-ett) n with commercial polyurethane (Lycra). As high as 50 wt% Na x (Ni-ett) n content composite film can withstand deformations of ≈500% and show conductivities of ≈10 −2 S cm −1 and Seebeck coefficients of approx. −40 µV K −1 . These novel materials can be easily synthesized on a large scale with continuous processes. When subjected to a small temperature difference (<20 °C), the films generate sufficient thermopower to be used for sensing strain (gauge factor ≈20) and visible light (sensitivity factor ≈36% (kW m −2 ) −1 ), independent of humidity (sensitivity factor ≈0.1 (%RH) −1 ). As a proof-of-concept, a wearable self-powered sensor is demonstrated by using n-type Na x (Ni-ett) n /Lycra and PEDOT:PSS/Lycra elements, connected in series by hot pressing, without employing any metal connections, hence preserving good mechanical ductility and ease of processing.

show abstract

Analysis of sensing properties of thermoelectric vapor sensor made of carbon nanotubes/ethylene-octene copolymer composites

Cited by 19 publications

References 41 publications

Accelerated Shape Forming and Recovering, Induction, and Release of Adhesiveness of Conductive Carbon Nanotube/Epoxy Composites by Joule Heating

Accelerated Shape Forming and Recovering, Induction, and Release of Adhesiveness of Conductive Carbon Nanotube/Epoxy Composites by Joule Heating

Improvement of mechanical and dielectric properties of ethylene–octene copolymer by multi‐walled carbon nanotubes functionalized with poly(2,2′‐bithiophene)

Flexible and Stretchable Self‐Powered Multi‐Sensors Based on the N‐Type Thermoelectric Response of Polyurethane/Na_x(Ni‐ett)_n Composites

Contact Info

Product

Resources

About

Analysis of sensing properties of thermoelectric vapor sensor made of carbon nanotubes/ethylene-octene copolymer composites

Cited by 19 publications

References 41 publications

Accelerated Shape Forming and Recovering, Induction, and Release of Adhesiveness of Conductive Carbon Nanotube/Epoxy Composites by Joule Heating

Accelerated Shape Forming and Recovering, Induction, and Release of Adhesiveness of Conductive Carbon Nanotube/Epoxy Composites by Joule Heating

Improvement of mechanical and dielectric properties of ethylene–octene copolymer by multi‐walled carbon nanotubes functionalized with poly(2,2′‐bithiophene)

Flexible and Stretchable Self‐Powered Multi‐Sensors Based on the N‐Type Thermoelectric Response of Polyurethane/Nax(Ni‐ett)n Composites

Contact Info

Product

Resources

About

Flexible and Stretchable Self‐Powered Multi‐Sensors Based on the N‐Type Thermoelectric Response of Polyurethane/Na_x(Ni‐ett)_n Composites