Sensor Activity of Carbon Nanotubes with a Boundary Functional Group

Запороцкова, И. В.; Polikarpova, N. P.; Vilkeeva, D.E.

doi:10.1166/nnl.2013.1704

Cited by 15 publications

(9 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When CNT is modified with nitrogroup there occurs transfer of electron density from the functional group a b c that changes the number of charge carriers in a nanotube and makes provisions for conductivity in the system which resembles earlier results [12,13].…”

Section: -2supporting

confidence: 75%

“…The authors have studied the attachment mechanism of a functional group -СООН [11] and NH2 [12] to a carbon tube, and investigated activity of these modified systems with regard to atoms and ions of alkali metals. Not least important and interesting is a study of implementation of boundary functionalization of a carbon nanotube with nitrogroup, and comparative analysis of a probe activity on the basis of obtained nanosystems.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative Analysis of Sensor Activity of Carbon Nanotubes Modified with Functional Groups

Борознина¹,

Запороцкова²,

Boroznin³

2017

J. Nano- Electron. Phys.

Self Cite

View full text Add to dashboard Cite

This article presents theoretical study of sensor activity of nanosystems based on a carbon nanotube modified with functional group (carboxyl, aminogen, nitrogroup) on some metal atoms and ions. Calculations were performed within the frameworks of molecular cluster model with application of semiempirical MNDO method and density functional theory DFT. The mechanism of binding functional groups to the open border of single-walled zigzag carbon nanotubes for the purpose of formation of a chemically-active sensor based on them has been investigated. Main geometric and electron energy characteristics of built systems have been defined. Interaction of the sensors built in this fashion with atoms and ions of some metals: potassium, sodium, lithium has been investigated.

show abstract

Section: -2supporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Sensor Activity of Carbon Nanotubes Modified with Functional Groups

Борознина¹,

Запороцкова²,

Boroznin³

2017

J. Nano- Electron. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Treating CNT with strong acids or alkalis leads to the formation of oxygen functional groups on the surface, such as carbonyl, carboxyl, hydroxyl, ketone and alcohol, enhancing electrocatalytic properties of CNT [5,6]. In works [7,8], calculations of a -COOH group charge on the nanotubes surface, performed by the DFT method, showed that the charges on the atoms of the functional group were as follows: +0.4 on the carbon atom, (−0.3) and (−0.3) on oxygen atoms and +0.2 on the hydrogen atom. The formation of this group on the CNT boundary results in transferring electron density from the C atom of a -COOH group to the nanotube surface.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the conductivity of the system increases. The carboxyl groups, showing an effect similar to nitrogen-containing ones, are the most active in oxygen reduction reactions (ORR) [7,8].…”

Section: Introductionmentioning

confidence: 99%

Modified Carbon Nanotubes: Surface Properties and Activity in Oxygen Reduction Reaction

et al. 2021

View full text Add to dashboard Cite

In order to develop highly efficient and stable catalysts for oxygen reduction reaction (ORR) that do not contain precious metals, it is necessary to modify carbon nanotubes (CNT) and define the effect of the modification on their activity in the ORR. In this work, the modification of CNTs included functionalization by treatment in NaOH or HNO3 (soft and hard conditions, respectively) and subsequent doping with nitrogen (melamine was used as a precursor). The main parameters that determine the efficiency of modified CNT in ORR are composition and surface area (XPS, BET), hydrophilic–hydrophobic surface properties (method of standard contact porosimetry (MSP)) and zeta potential (dynamic light scattering method). The activity of CNT in ORR was assessed following half-wave potential, current density within kinetic potential range and the electrochemically active surface area (SEAS). The obtained results show that the modification of CNT with oxygen-containing groups leads to an increase in hydrophilicity and, consequently, SEAS, as well as the total (overall) current. Subsequent doping with nitrogen ensures further increase in SEAS, higher zeta potential and specific activity in ORR, reflected in the shift of the half-wave potential by 150 mV for CNTNaOH-N and 110 mV for CNTHNO3-N relative to CNTNaOH and CNTHNO3, respectively. Moreover, the introduction of N into the structure of CNTHNO3 increases their corrosion stability.

show abstract

“…As a modifying group for a carbon nanotube, researchers often use a carboxyl functional group, which contributes to the creation of reactive sites at the boundaries or side walls of a nanotube. Thus, in Sun's article [15], it was found that carbon nanotubes modified with a carboxyl group shows sensitivity to CO with a detection limit of 0.00001, whereas unmodified (clean) nanotubes did not react to the presence of this gas [16,17]. Besides carboxyl groups, CNTs are often modified by amino groups.…”

Section: Introductionmentioning

confidence: 99%

Sensors Based on Amino Group Surface-Modified CNTs

et al. 2019

View full text Add to dashboard Cite

This article discusses the possibility of the fabrication of a highly sensitive sensor based on single-walled carbon nanotubes surface modified with functional amino groups (-NH2). The sensor potential for detection of alkali (sodium, lithium, and potassium) metals was investigated. The results of computer simulation of the interaction process between the sensor and an arbitrary surface of the modified tube containing atoms of the studied metals are presented. The calculations were carried out within the framework of the density functional theory (DFT) method using the molecular cluster model. It has been proved that surface-modified ammonium carbon nanotubes show high sensitivity for the metal atoms under study.

show abstract

Sensor Activity of Carbon Nanotubes with a Boundary Functional Group

Cited by 15 publications

References 0 publications

Comparative Analysis of Sensor Activity of Carbon Nanotubes Modified with Functional Groups

Comparative Analysis of Sensor Activity of Carbon Nanotubes Modified with Functional Groups

Modified Carbon Nanotubes: Surface Properties and Activity in Oxygen Reduction Reaction

Sensors Based on Amino Group Surface-Modified CNTs

Contact Info

Product

Resources

About