Synthesis, magnetoresistance, and thermoelectrical properties of environmentally stable n-type nitrogen-doped multiwalled carbon nanotubes

Andzane, Jana; Katkov, Mikhail V.; Buks, Krisjanis; Sarakovskis, Anatolijs; Smits, Krisjanis; Erts, Donats

doi:10.1016/j.cartre.2023.100302

Cited by 4 publications

(8 citation statements)

References 48 publications

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“…MWCNTs were synthesized in a chemical vapor deposition (CVD) reactor with a spray-assisted method under 20 mm·s –1 flow of argon at atmospheric pressure within a hermetically sealed quartz tube and heated to 850 °C as described elsewhere …”

Section: Methodsmentioning

confidence: 99%

Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb₂Te₃-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices

Andzane,

Spalva,

Katkevics

et al. 2023

ACS Appl. Energy Mater.

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In this work, thermoelectrical properties of flexible thermoelectric films fabricated by the encapsulation of multiwalled carbon nanotube-antimony telluride (Sb2Te3-MWCNT) hybrid networks with different Sb2Te3:MWCNT mass ratios in polydimethylsiloxane (PDMS) were studied for the first time. Sb2Te3-MWCNTs were synthesized by the direct physical vapor deposition of Sb2Te3 nanostructures on the MWCNT network, spray-coated on a flexible polyimide substrate, and encapsulated in PDMS using a drop-casting technique. A study of electrical and thermoelectric properties of Sb2Te3-MWCNT hybrid networks before and after encapsulation revealed that encapsulation effectively preserves the properties of the hybrid networks and improves their durability under repetitive bending, showing deviations in resistance not exceeding 0.5% of the initial value during 100 repetitive bending cycles down to a 3 mm radius. Encapsulated Sb2Te3-MWCNT networks showed the thermoelectric power factor (PF) reaching 9.5 μW·m–1 K–2, which is ∼3 orders of magnitude higher than the values of PF showed previously by the composites prepared by mechanical mixing of the Sb2Te3-MWCNT hybrid networks with a nonconductive polymer. PDMS-encapsulated Sb2Te3-MWCNT hybrid networks in combination with previously reported PVA-encapsulated Bi2Se3-MWCNT hybrid networks were used to assemble 4-leg-pair flexible thermoelectric generators, where leg pairs were connected in series or parallel. Both types of generators showed stable performance with different external resistances connected in the circuit and reached an output power of ∼7–10 μW·cm–2 and an output current of ∼1–5 μA. These parameters illustrate the significant potential of the presented PDMS-encapsulated Sb2Te3-MWCNT hybrid networks as building blocks for custom flexible devices for micro- and nanopower applications.

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Section: Methodsmentioning

confidence: 99%

Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb₂Te₃-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices

Andzane,

Spalva,

Katkevics

et al. 2023

ACS Appl. Energy Mater.

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“…The R(T) curve of the p-type Bi 2 Se 3 -MWCNT network showed an incremental increase in the resistance with the decrease in temperature from 300 K down to ~30 K, followed by the rapid increase in the resistance at temperatures below 30 K (Figure 3e). At temperatures between 3 and 150 K, the R(T) curve fit Mott's 3D VRH model (Figure 3e, inset), which indicated the domination of the hopping mechanism of conduction similarly to disordered CNT networks [35,[52][53][54]. The resistance values shown by the p-type Bi 2 Se 3 -MWCNT network were slightly lower in comparison with that of bare MWCNT networks, which could be related to the increase in localization length of the charge carriers due to the reduced potential barriers at MWCNT/Bi 2 Se 3 interfaces similarly to the case of the Sb 2 Te 3 -MWCNT heterostructured network.…”

Section: Resultsmentioning

confidence: 82%

“…The R(T) curve for the bare MWCNT network showed semiconductor behavior, where a monotonous incremental increase in the resistance with the decrease in the temperature from 300 K to ~30 K was followed by a rapid increase in resistance at temperatures below 30 K (Figure 3a). samples were studied in the temperature region of 2-300 K. R(T) dependencies of bare MWCNT networks (Figure 3a) and reference nanostructured Sb2Te3 and Bi2Se3 thin films (Figure 3b,c) were shown to be typical for these materials' behavior [35,[43][44][45]. The R(T) curve for the bare MWCNT network showed semiconductor behavior, where a monotonous incremental increase in the resistance with the decrease in the temperature from 300 K to ~30 K was followed by a rapid increase in resistance at temperatures below 30 K (Figure 3a).…”

Section: Resultsmentioning

confidence: 99%

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The Impact of Topological States on the Thermoelectric Performance of p- and n-Type Sb2Te3/Bi2Se3-Multiwalled Carbon Nanotubes Heterostructured Networks

Andzane,

Buks,

Spalva

et al. 2023

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The resistance and magnetoresistance of flexible thermoelectric p-type Sb2Te3-MWCNT, p-type Bi2Se3-MWCNT, and n-type Bi2Se3-MWCNT heterostructures were studied in the temperature range from 2 K to 300 K to reveal the conductance mechanisms governing the thermoelectric properties of these heterostructured networks. It was found that the conductance in heterostructured networks at different temperatures is governed by different processes and components of the networks. This effect was found to be related to the growth mechanisms of the Sb2Te3 and Bi2Se3 nanostructures on the MWCNT networks. At near-room temperatures, the Sb2Te3 and Bi2Se3 nanostructures were found to have the dominant contribution to the total conductance of the p-type Sb2Te3-MWCNT and n-type Bi2Se3-MWCNT networks. In turn, the conduction of p-type Bi2Se3-MWCNT heterostructured networks in a full temperature range and p-type Sb2Te3-MWCNT and n-type Bi2Se3-MWCNT heterostructured networks at temperatures below 30 K was governed by the MWCNTs; however, with the contribution from 2D topological states of Sb2Te3 and Bi2Se3 nanostructures, these were manifested by the weak antilocalization effect (WAL) cusps observed at temperatures below 5–10 K for all heterostructured networks considered in this work.

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“…MWCNTs were synthesized using the spray-assisted chemical vapour deposition method from a gas phase as described elsewhere. 24 The synthesis occurred in an inert (argon) atmosphere under atmospheric pressure at a flow rate of 20 mm s −1 . 2 wt% ferrocene dissolved in toluene was used for one synthesis cycle.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and enhanced room-temperature thermoelectric properties of CuO–MWCNT hybrid nanostructured composites

Sondors,

Gavars,

Spalva

et al. 2024

Nanoscale Adv.

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Synthesis, magnetoresistance, and thermoelectrical properties of environmentally stable n-type nitrogen-doped multiwalled carbon nanotubes

Cited by 4 publications

References 48 publications

Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb₂Te₃-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices

Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb₂Te₃-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices

The Impact of Topological States on the Thermoelectric Performance of p- and n-Type Sb2Te3/Bi2Se3-Multiwalled Carbon Nanotubes Heterostructured Networks

Synthesis and enhanced room-temperature thermoelectric properties of CuO–MWCNT hybrid nanostructured composites

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Synthesis, magnetoresistance, and thermoelectrical properties of environmentally stable n-type nitrogen-doped multiwalled carbon nanotubes

Cited by 4 publications

References 48 publications

Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb2Te3-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices

Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb2Te3-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices

The Impact of Topological States on the Thermoelectric Performance of p- and n-Type Sb2Te3/Bi2Se3-Multiwalled Carbon Nanotubes Heterostructured Networks

Synthesis and enhanced room-temperature thermoelectric properties of CuO–MWCNT hybrid nanostructured composites

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Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb₂Te₃-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices

Thermoelectric Properties of Bare and Nonconductive Polymer-Encapsulated Sb₂Te₃-MWCNT Hybrid Networks and Their Application in Flexible Heat-to-Power Conversion Devices