Efficient encapsulation of conducting polyaniline chains inside carbon nanotubes: a new strategy to prepare endohedral CNT materials

Liu, Zhipeng; Liao, Gaomin; Li, Shaoyun; Pan, Yuanyuan; Wang, Xuyang; Weng, Yuyan; Zhang, Xiaohua; Yang, Zhaohui

doi:10.1039/c3ta12988h

Cited by 28 publications

(23 citation statements)

References 35 publications

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“…The ion transportation properties and effective pore sizes of the pure CNM and PNIPAM-CNM can be measured by salt diffusion test, because the trans-film permeability of ions can be measured by conductivity change in downstream of membrane and can be correlated to the effective pore sizes by Knudsen diffusion law 17 . As the most common substance contains cations and anions, KCl aqueous solution is chosen to detect the ion transportation of membranes 14 18 22 . Figure 5 shows the conductivity change in downstream of the pure CNM (a) and PNIPAM-CNM (b) at different temperatures with different penetration times.…”

Section: Resultsmentioning

confidence: 99%

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A smart temperature and magnetic-responsive gating carbon nanotube membrane for ion and protein transportation

Cong

et al. 2016

Sci Rep

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Carbon nanotube (CNT) nanoporous membranes based on pre-aligned CNTs have superior nano-transportation properties in biological science. Herein, we report a smart temperature- and temperature-magnetic-responsive CNT nanoporous membrane (CNM) by grafting thermal-sensitive poly(N-isopropylacrylamide) (PNIPAM) and Fe3O4 nanoparticles (Fe3O4-NPs) on the open ends of pre-aligned CNTs with a diameter around 15 nm via surface-initiated atom transfer radical polymerization (SI-ATRP) method. The inner cavity of the modified CNTs in the membrane is designed to be the only path for ion and protein transportation, and its effective diameter with a variation from ~5.7 nm to ~12.4 nm can be reversible tuned by temperature and magnetic field. The PNIPAM modified CNM (PNIPAM-CNM) and PNIPAM magnetic nanoparticles modified CNM (PNIPAM-MAG-CNM) exhibit excellent temperature- or temperature-magnetic-responsive gating property to separate proteins of different sizes. The PNIPAM-CNMs and PNIPAM-MAG-CNMs have potential applications in making artificial cells, biosensors, bioseparation and purification filters.

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Section: Resultsmentioning

confidence: 99%

“…This kind of membrane contains vertical aligned CNTs embedded in a crack-free matrix with open ends extending out of the film. The inner cavity of the CNTs is the only path for molecule or ion transportation 21 22 23 .…”

mentioning

confidence: 99%

A smart temperature and magnetic-responsive gating carbon nanotube membrane for ion and protein transportation

Cong

et al. 2016

Sci Rep

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“…A 3 g amount of poly(vinyl alcohol) (PVA) powder (degree of alcoholysis,87–89%; purchased from Alfa) was dissolved in 20 mL of aniline/H 2 SO 4 (molar ratio, 1:2) solution ([aniline] = 0.1 mol/L, 0.2 mol/L, 0.5 mol/L, 1 mol/L, 2 mol/L; purchased from Sinopharm) and heated at 90 °C for 2 h. Then 4.5 g of H 3 PO 4 solution was added into the solution and kept stirring for 1 h. Carbon nanotube arrays (ACNT) with a height of about 600 μm were synthesized through a chemical vapor deposition method . The highly densified carbon nanotube arrays (DACNT) were prepared by capillary force induced shrinkage assisted by the evaporation of ethanol, referred to as before. , The whole assembly process is illustrated as Scheme .…”

Section: Methodsmentioning

confidence: 99%

Spatial Distribution Control on the Energy Storage Performance of PANI@PVA@ACNT-Based Flexible Solid-State Supercapacitors

Zhu

Zhang

et al. 2020

ACS Appl. Energy Mater.

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In this work, a redox and an electrochemical polymerization method were carried out separately to produce the composite PANI@PVA@ACNT-based flexible solid-state supercapacitor (FSC) device with symmetrical "sandwich structure". Interestingly different polymerization methods result in different spatial structures, which lead to significant difference in the ion transport behaviors and energy storage mechanisms. The redox-polymerized aniline (R-PANI) provides a 3D polyaniline network in the gel system which exhibits a diffusion-controlled energy storage mechanism. While the electrochemical-polymerized aniline (E-PANI) is found to form a PANI nanoparticles attached-CNTs structure which shows a more typical pseudocapacitive behavior and better rate performance. The maximum specific capacitance of the E-PANI@PVA@ACNT and R-PANI@PVA@ACNT device reached as high as 896 mF•cm −3 (206 mF•cm −2 ) and 667 mF•cm −3 (200 mF•cm −2 ) respectively, which is much better than the prepolymerized PANI@ACNT samples (216 mF•cm −3 ). In addition, the composite devices based on highly densified carbon nanotube arrays (DACNTs) were found to have a superior electrochemical performance. The maximum specific capacitance of the E-PANI@PVA@DACNT and R-PANI@PVA@DACNT device reached as high as 1.95 F•cm −3 (432 mF•cm −2 ) and 2.91 F•cm −3 (873 mF•cm −2 ), respectively. The highest energy density was measured to be 0.389 mW•h•cm −3 (0.09 mW•h•cm −2 ) for E-PANI@PVA@DACNT and 0.572 mW•h•cm −3 (0.17 mW•h•cm −2 ) for R-PANI@PVA@DACNT with high power density of 11.2 mW•cm −3 (2.58 mW•cm −2 ) and 74.4 mW•cm −3 (22.3 mW•cm −2 ), respectively. Besides, the long-term cyclic stability and excellent rate performance of such devices were also achieved. Our approach well overcomes the general obstacle that the hydrogel electrolyte is likely blocked by the carbon-based electrode materials in the FSC system. In addition, our findings reveal that the relationship between the spatial distribution and energy storage mechanisms of mixed-type supercapacitor devices thus helps the design of redox-enhanced FSC devices with excellent performances.

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“…Detained CNT membrane preparation procedure can be found in our previous work. 17 A 20 nm Au colloid permeation experiment was carried out to test the integrity of CNT membranes. 18−20 In our studies, no permeation of 20 nm Au colloids (525 nm optical absorption peak) through the (14 ± 2) nm CNT membrane is observed (Figure S1).…”

Section: Methodsmentioning

confidence: 99%

Promotion of Water Channels for Enhanced Ion Transport in 14 nm Diameter Carbon Nanotubes

Sheng¹,

Zhu²,

Zeng³

et al. 2017

ACS Appl. Mater. Interfaces

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Ion transport plays an important role in solar-to-electricity conversion, drug delivery, and a variety of biological processes. Carbon nanotube (CNT) is a promising material as an ion transporter in the applications of the mimicking of natural ion channels, desalination, and energy harvesting. Here, we demonstrate a unique, enhanced ion transport through a vertically aligned multiwall CNT membrane after the application of an electric potential across CNT membranes. Interestingly, electrowetting arising from the application of an electric potential is critical for the enhancement of overall ion transport rate through CNT membranes. The wettability of a liquid with high surface tension on the interior channel walls of CNTs increases during an electric potential treatment and promotes the formation of water channels in CNTs. The formation of water channels in CNTs induces an increase in overall ion diffusion through CNT membranes. This phenomenon is also related to a decrease in the charge transfer resistance of CNTs (R) after an electric potential is applied. Correspondingly, the enhanced ion flow rate gives rise to an enhancement in the capacitive performance of CNT based membranes. Our observations might have profound impact on the development of CNT based energy storage devices as well as artificial ion channels.

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Efficient encapsulation of conducting polyaniline chains inside carbon nanotubes: a new strategy to prepare endohedral CNT materials

Cited by 28 publications

References 35 publications

A smart temperature and magnetic-responsive gating carbon nanotube membrane for ion and protein transportation

A smart temperature and magnetic-responsive gating carbon nanotube membrane for ion and protein transportation

Spatial Distribution Control on the Energy Storage Performance of PANI@PVA@ACNT-Based Flexible Solid-State Supercapacitors

Promotion of Water Channels for Enhanced Ion Transport in 14 nm Diameter Carbon Nanotubes

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