Controlled synthesis of N-type single-walled carbon nanotubes with 100% of quaternary nitrogen

Hong, Soon Hyeok; Lee, Dong Myeong; Park, Min; Wee, Jae-Hyung; Jeong, Hyeon Su; Ku, Bon‐Cheol; Yang, Cheol Min; Lee, Dong Su; Terrones, Mauricio; Kim, Yoong Ahm; Hwang, Jun Yeon

doi:10.1016/j.carbon.2020.06.027

Cited by 24 publications

(21 citation statements)

References 35 publications

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“…The Seebeck coefficient is competitive with values obtained from literature on SWNT doping. 295,404 Interestingly there is a sign change from p-to n-type that is temperature dependent for the 10% SWNT-PEDOT:PSS-conc film. The film's Seebeck coefficient is < 9 µV K --1 at 40 °C meanwhile at 75 °C it is -1 µV K --1 .…”

Section: Figure 6521 Represents the Electrical Conductivity Against A Temperature Profile For The Swnt-pedot:pss Films (A) Depicts The Swmentioning

confidence: 97%

“…This was useful for studying n-type doping of single walled carbon nanotubes (SWNTs) and SWNT-PEDOT:PSS samples due to the red shift at the G band. [295][296][297] It was also possible to determine reduction of thiophene molecules through the spectral intensity and width shortening due to reduction at specific regions. The most significant utilization of this instrumental technique was in determining the Raman red shift at 1440 cm -1 which indicates the benzoid to quinoid conformational change in PEDOT chains.…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…308 This was instrumental in also determining the oxidation state of other species such as Nitrogen via the position of the BE for Nitrogen 1s. 295 For the peak fitting the software freely available CASA XPS (http://www.casaxps.com/) was used to model the high resolution XPS data. Theoretical chemical composition as well as specific known information about samples were used to create peak fitting models such as knowledge that Sulphur 2p has Spin-orbital doublet whereby the 3/2 peak is twice as intense as the 1/2 peak with a separation energy of 1.2.…”

Section: Xray Photoelectron Spectroscopymentioning

confidence: 99%

“…298,363,406 Because of the sensitivity of Raman spectroscopy, it's possible to detect changes in carrier concentration of SWNT via the position and shift of the G band (typically found around 1590 cm -1 depending on sample or chemical environment). 137,295 This means Raman studies can be utilized to corroborate n-type doping via red shift of the G band. 295 Cβ stretching vibrations respectively.…”

Section: Doping Mechanism Behind N-type Characteristics Of Swnt-pedot:pssmentioning

confidence: 99%

“…137,295 This means Raman studies can be utilized to corroborate n-type doping via red shift of the G band. 295 Cβ stretching vibrations respectively. 308,397,406 As exhibited in Table 6.6.1 and shown in Figure 6.1.1 (a) the 1-pristine PEDOT:PSS film (utilized as a reference) has a symmetrical C𝛼𝛼 = Cβ stretching at 1434 cm -1 whereby relative to the other 2 films it's the most blue shifted.…”

Section: Doping Mechanism Behind N-type Characteristics Of Swnt-pedot:pssmentioning

confidence: 99%

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Improvement to the thermoelectric properties of PEDOT:PSS

Atoyo¹

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Thermoelectric materials can convert waste heat to electricity without moving parts. Extensive research into improving the efficiency of inorganic thermoelectric materials has allowed some materials such as bismuth tellurides to be commercialized. These materials, however, contain materials in low abundance on earth such as tellurium therefore their use and scaled production would be limited. Organic and hybrid thermoelectric materials can meet the gap for niche markets as well as be synthesized on mass, due to utilization of earth abundant elements such as carbon, sulphur, and nitrogen. The thermoelectric generators require several n and p-type materials connected for optimal efficiency. There are many ways to create inorganic thermoelectric n and p-types. However, for the organic thermoelectric materials the efficiency lags because of their lower electrical conductivity and Seebeck coefficient as well as the lack of effective strategies in the development of n-type materials. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is one of the most successful and researched p-type organic thermoelectric material and thus, the thesis will explore effective strategies for decoupling the apparent trade-offs observed when improving either the electrical conductivity or Seebeck coefficient. The first major contribution to knowledge discussed in this study is the utilization of a reducing agent treatment on PEDOT-ionic liquid composites (reader is advised to refer to chapter 5). Another significant finding was the successful development of a novel route to an n-type single walled carbon nanotube, PEDOT:PSS composite (please refer to chapter 6). The final and most significant contribution to knowledge in this research project was the development of a set of novel single walled carbon nanotube, ionic liquid, PEDOT:PSS composites whereby after a post treatment with a guanidinium iodide in ethylene glycol solution allowed for improvement of the electrical conductivity from 3.4 S cm -1 to 3665 S cm-1 and Seebeck coefficient from 12 μV K-1 to 27 μV K-1 thereby leading to an optimised power factor of 236 μW m-1 K-1 at 140 °C (please refer to chapter 7).

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Section: Figure 6521 Represents the Electrical Conductivity Against A Temperature Profile For The Swnt-pedot:pss Films (A) Depicts The Swmentioning

confidence: 97%

Section: Raman Spectroscopymentioning

confidence: 99%

Section: Xray Photoelectron Spectroscopymentioning

confidence: 99%

Section: Doping Mechanism Behind N-type Characteristics Of Swnt-pedot:pssmentioning

confidence: 99%

Section: Doping Mechanism Behind N-type Characteristics Of Swnt-pedot:pssmentioning

confidence: 99%

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Improvement to the thermoelectric properties of PEDOT:PSS

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Highly Conductive Nitrogen‐Doped sp²/sp³ Hybrid Carbon as a Conductor‐Free Charge Storage Host

Wang

Chen

et al. 2022

Adv Funct Materials

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It is commonly accepted that the increased degree of graphitization leads to a higher electrical conductivity of carbon materials. However, more and more evidence reveals that heteroatom doping on carbon host can also improve the conductivity, owing to the dopant atoms contributing to higher charge delocalization and density of donor states near Fermi level. The reality is, such conductivity improvement from doping is often overwhelmed by graphitized carbon. Although heteroatom‐doped carbon is widely used as active materials in the fields of energy storage and electrocatalysis, which still requires extra carbon‐based conductive additives to enhance the overall conductivity. In this stu, it is demonstrated that the electrical conductivity of finely designed nitrogen‐doped carbon is even beyond the commercialized carbon conductors over 3.5 times, endowing such conductive agent‐free electrode material an excellent performance in an all‐solid‐state flexible supercapacitor. The theoretical simulation further demonstrates that N‐doped sp2/sp3 hybrid carbon can migrate the Fermi level to the conduction band, leading to an n‐type conductivity due to the additional electrons caused by the N dopant.

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Ion Resource Recovery via Electrodialysis Fabricated with Poly(Arylene Ether Sulfone)‐Based Anion Exchange Membrane in Organic Solvent System

Xu,

Mu,

Yao

et al. 2023

Small

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Ion resource recovery from organic wastewater is beneficial for achieving emission peaks and carbon neutrality targets. Advanced organic solvent‐resistant anion exchange membranes (AEMs) for treating organic wastewater via electrodialysis (ED) are of significant interest. Herein, a kind of 3D network AEM based on poly(arylene ether sulfone) cross‐linked with a flexible cross‐linker (DBH) for ion resource recovery via ED in organic solvent system is reported. Investigations demonstrate that the as‐prepared AEMs show excellent dimensional stability in 60% DMSO (aq.), 60% ethanol (aq.), and 60% acetone (aq.), respectively. For example, the optimized AEM shows very low swelling ratios of 1.04–1.10% in the organic solvents. ED desalination ratio can reach 99.1% after exposure of the AEM to organic solvents for 30 days, and remain > 99% in a mixture solution containing organic solvents and 0.5 m NaCl. Additionally, at a current density of 2.5 mA cm−2, the optimized AEM soaked in organic solvents for 30 days shows a high perm‐selectivity (Cl−/SO42−) of 133.09 (vs 13.11, Neosepta ACS). The superior ED performance is attributed to the stable continuous sub‐nanochannels within AEM confirmed by SAXS, rotational energy barriers, etc. This work shows the potential application of cross‐linked AEMs for resource recovery in organic wastewater.

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Controlled synthesis of N-type single-walled carbon nanotubes with 100% of quaternary nitrogen

Cited by 24 publications

References 35 publications

Improvement to the thermoelectric properties of PEDOT:PSS

Improvement to the thermoelectric properties of PEDOT:PSS

Highly Conductive Nitrogen‐Doped sp²/sp³ Hybrid Carbon as a Conductor‐Free Charge Storage Host

Ion Resource Recovery via Electrodialysis Fabricated with Poly(Arylene Ether Sulfone)‐Based Anion Exchange Membrane in Organic Solvent System

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Controlled synthesis of N-type single-walled carbon nanotubes with 100% of quaternary nitrogen

Cited by 24 publications

References 35 publications

Improvement to the thermoelectric properties of PEDOT:PSS

Improvement to the thermoelectric properties of PEDOT:PSS

Highly Conductive Nitrogen‐Doped sp2/sp3 Hybrid Carbon as a Conductor‐Free Charge Storage Host

Ion Resource Recovery via Electrodialysis Fabricated with Poly(Arylene Ether Sulfone)‐Based Anion Exchange Membrane in Organic Solvent System

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Highly Conductive Nitrogen‐Doped sp²/sp³ Hybrid Carbon as a Conductor‐Free Charge Storage Host