Preparation and application of N-doped carbon nanotube arrays on graphene fibers

Li, Mochen; Zhang, Xiaohong; Jiang, Haibin; Wang, Xiang; Ru, Yue; Qiao, Jie

doi:10.1088/1361-6528/aa80d8

Cited by 9 publications

(5 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Graphene, a two-dimensional (2D) monolayer of carbon atoms packed into a honeycomb lattice, has become one of the most exciting research topics in the last decade. − The typically important properties of graphene are outstanding strength, high specific surface areas, high thermal conductivity, strong chemical durability, high electron mobility, and intrinsic hydrophobicity . Such unique properties qualify graphene as a promising source to fabricate high-performance materials for high-end applications, such as hydrogen storage, , oil cleanup, and in high-performance electronics and sensors. , However, the 2D graphene sheets need to assemble into three-dimensional (3D) architectures in most of the applications to achieve better performance. , Similar to 3D graphene materials from the 2D graphene sheets, the low-density graphene aerogel with elasticity and high electric conductivity has been studied widely.…”

Section: Introductionmentioning

confidence: 99%

Conductive Graphene–Melamine Sponge Prepared via Microwave Irradiation

Liu

Jiang

et al. 2018

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

A conductive graphene-melamine sponge (MS) prepared via microwave irradiation is reported in this paper. Graphene oxide supported on the MS was prereduced first at 100 °C and then further reduced in a household microwave oven at over 1000 °C. It was surprising to find that graphene oxide on the MS was reduced perfectly while the three-dimensional structure of the MS was kept well after high-temperature reduction via microwave irradiation. Slight pyrolysis of MS was also found during 5 s microwave irradiation, resulting in nitrogen generation from the pyrolysis of the MS being doped into graphene, which could benefit the electric conductivity of the prepared graphene-MS. The electric conductivity of the prepared graphene-MS is about 0.12-1.0 S/m because of the high reduction degree of graphene oxide and nitrogen doping. On the other hand, different from the pure MS, the newly developed conductive graphene-MS possesses superhydrophobic and superoleophilic properties. Overall, the newly developed conductive graphene-MS contained 94.3 wt % MS and 5.7 wt % N-doped graphene and is a cost-effective material with good elasticity, high conductivity, superhydrophobicity, and superoleophilicity.

show abstract

Section: Introductionmentioning

confidence: 99%

Conductive Graphene–Melamine Sponge Prepared via Microwave Irradiation

Liu

Jiang

et al. 2018

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…Since carbon nanotubes (CNTs) were discovered [1], their remarkable chemical and physical properties have been attracting more and more attention [2][3][4]. Owing to the hollow space of the CNTs, filling some species inside CNTs has aroused considerable attention [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Stabilities and electronic properties of nanowires made of single atomic sulfur chains encapsulated in zigzag carbon nanotubes

Bai

et al. 2018

Nanotechnology

View full text Add to dashboard Cite

Theoretical investigations are carried out on the recently synthesized one-dimensional nanowires made of atomic sulfur chains encapsulated in carbon nanotubes (called S@CNTs). Special attention is paid to stability, electronic property and transport properties of these combined nanowires. It is found that the encapsulation is exothermic when S@CNTs are built from the tubes with diameter larger than 6.4 Å. Thus the experimental results are energetically favorable since the diameters of the CNTs are about 6 Å in the obtained S@CNTs. The combined nanowires can be stabilized by van der Waals interaction between sulfur chain and tube as indicated from radial distribution function and reduced density gradient descriptions. All S@CNTs studied in this work exhibit metallic property with the partially filled bands. However, the conducting component and the pathway of charge carriers are various. For instance, only the sulfur chain is the conducting pathway for S@CNT(8, 0), while both the sulfur chain and tube are the conducting pathways for S@CNT(9, 0). This interesting feature was understood based on the band structures and crystal orbital analysis. The electronic transport properties of the systems are performed by investigating and analyzing the transmission spectra, current-voltage (I-V) curves and transmission eigenstate, which confirm that the sulfur chains can improve the electronic transport of CNTs. Moreover, the electrostatic interaction resulted from the charge transfer between the two components of S@CNTs should be favorable to the stability of the combined nanowires.

show abstract

“…Исследования последних лет показывают, что дополнительное введение гетероатомов в структуру углеродных нанотрубок (УНТ) позволяет изменять их электронные и физические свойства [1]. Большой интерес представляет процесс легирования УНТ атомами азота [2].…”

Section: аннотацияunclassified

Control of nitrogen defects in carbon nanotubes for self-powered memristive systems

Il’in,

Homlenko,

Khubezhov

et al. 2023

Genes & Cells

View full text Add to dashboard Cite

Recent studies show that the additional introduction of heteroatoms into the structure of CNTs makes it possible to change their electronic and physical properties [1]. Of great interest is the process of doping CNTs with nitrogen atoms [2]. The introduction of nitrogen defects into a lattice of carbon atoms makes it possible to modify the CNT structure up to the demonstration of anomalous properties that are not appropriate for this material [3]. It has been shown that multi-walled N-CNTs can exhibit memristive and piezoelectric properties [4]. The parameters of CNTs during synthesis can be controlled by the plasma enhanced chemical vapor deposition (PECVD) method. The addition of ammonia (NH3) to the carbonaceous gas in the PECVD process allows CNTs to be doped directly during growth. At the same time, the dopant concentration and the type of nitrogen defects have a significant effect on the properties of CNTs. The memristive properties of CNTs have already been sufficiently studied [5], however, for their application in self-powered systems, additional studies of the parameters of the piezoelectric module of N-CNTs are required. The aim of this work is to study the effect of ammonia flow on the concentration, type of nitrogen defects, and the value of the piezoelectric modulus during growth of CNTs by the PECVD. Silicon (100) substrates were used as samples with films of a buffer (Mo, 100 nm) sublayer and a catalytic layer (Ni, 15 nm). CNTs were grown at a temperature of 550 °C in an atmosphere of acetylene (C2H2, 35 sccm) and NH3. The C2H2 flow was kept constant, while the NH3 flow was changed in the C2H2:NH3 ratio from 1:1 to 1:10. Based on the obtained SEM images, it was found that with an increase in the ratio of C2H2:NH3 flowes, an increase in the density of nanotubes in the array were observed. This occurs due to more active growth of N-CNTs on small nickel catalytic centers due to the accelerated process of hydrogen desorption and its binding with ions in ammonia plasma, which leads to an increase in the growth rate of nanotubes on smaller catalytic centers. Thus, the area of the catalytic center is one of the limiting factors of the growth rate and allows one to control the aspect ratio and density of CNTs in the array. An analysis of the XPS spectra showed that with an increase in the ratio of C2H2:NH3 flows from 1:1 to 1:10, a nonlinear change in the concentration of the nitrogen dopant in N-CNTs from 8.4 to 12 at % is also observed. This led to a nonlinear change in the piezoelectric modulus of nanotubes from 8.7 to 20.6 pm/V and a change in their memristive properties. It has been established that an increase in the concentration of doping nitrogen leads to an increase in the piezoelectric modulus of N-CNTs, which is the source of the memristive effect. The obtained results can be used in the development of energy-efficient piezoelectric nanogenerators based on an array of vertically aligned N-CNTs for autonomous memristive systems.

show abstract

Preparation and application of N-doped carbon nanotube arrays on graphene fibers

Cited by 9 publications

References 37 publications

Conductive Graphene–Melamine Sponge Prepared via Microwave Irradiation

Conductive Graphene–Melamine Sponge Prepared via Microwave Irradiation

Stabilities and electronic properties of nanowires made of single atomic sulfur chains encapsulated in zigzag carbon nanotubes

Control of nitrogen defects in carbon nanotubes for self-powered memristive systems

Contact Info

Product

Resources

About