Electrical behavior of multi-walled carbon nanotube network embedded in amorphous silicon nitride

Stavarache, Ionel; Lepadatu, Ana-Maria; Teodorescu, V. S.; Ciurea, Magdalena Lidia; Iancu, V.; Dragoman, Mircea; Konstantinidis, George; Buiculescu, Raluca

doi:10.1186/1556-276x-6-88

Cited by 18 publications

(8 citation statements)

References 24 publications

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“…Multiwall carbon nanotubes range from metallic to semiconducting structures [ 31 – 32 ]. The valence edge of the CNTs correspond to the work function [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Free and partially encapsulated manganese ferrite nanoparticles in multiwall carbon nanotubes

Al-Khabouri¹,

Al-Harthi²,

Maekawa³

et al. 2020

Beilstein J. Nanotechnol.

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Free and partially encapsulated manganese ferrite (MnFe2O4) nanoparticles are synthesized and characterized regarding structure, surface, and electronic and magnetic properties. The preparation method of partially encapsulated manganese ferrite enables the formation of a hybrid nanoparticle/tube system, which exhibits properties of manganese ferrite nanoparticles inside and attached to the external surface of the tubes. The effect of having manganese ferrite nanoparticles inside the tubes is observed as a shift in the X-ray diffraction peaks and as an increase in stress, hyperfine field, and coercivity when compared to free manganese ferrite nanoparticles. On the other hand, a strong charge transfer from the multiwall carbon nanotubes is attributed to the attachment of manganese ferrite nanoparticles outside the tubes, which is detected by a significant decrease in the σ band emission of the ultraviolet photoemission spectroscopy signal. This is followed by an increase in the density of states at the Fermi level of the attached manganese ferrite nanoparticles in comparison to free manganese ferrite nanoparticles, which leads to an enhancement of the metallic properties.

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“…Multiwall carbon nanotubes range from metallic to semiconducting structures [ 31 – 32 ]. The valence edge of the CNTs correspond to the work function [ 33 ].…”

Section: Resultsmentioning

confidence: 99%

Free and partially encapsulated manganese ferrite nanoparticles in multiwall carbon nanotubes

Al-Khabouri¹,

Al-Harthi²,

Maekawa³

et al. 2020

Beilstein J. Nanotechnol.

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“…Upon formation of ROS, cellular esterase hydrolyzes DCF-DA to the highly fluorescent 2′, 7′–dichlorofluorescein (DCF). 41 Briefly, BEAS-2B cells were seeded overnight in a 96-well plate (Corning, USA) at a density of 1.5x10 4 cell per well, and incubated with 5 μM DCF-DA at 37 °C for 30 min. Subsequently, the cells were treated with 24 μg/cm 2 MWCNTs suspended in Hank's Balanced Salt Solution (HBSS; Life Technologies, USA) for different time periods.…”

Section: Methodsmentioning

confidence: 99%

“…The versatility in physical and chemical properties including high strength to weight ratio, 1, 2, 3 electrical 4 and thermal conductivity 5 make multi-walled carbon nanotubes (MWCNTs) attractive candidates for applications in a wide variety of fields from electronic devices, 6 sports equipment, 7 aerospace industry, 8 to sensors 9 and composite materials. 10 Recently, functionalization of MWCNTs with amino acids, 11 peptides, 12 and other small biomolecules 13 has been explored for biomedical and biotechnological applications in gene 14 and drug delivery, 15 bioimaging, 16 and for therapeutics.…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotube uptake changes the biomechanical properties of human lung epithelial cells in a time-dependent manner

et al. 2015

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The toxicity of engineered nanomaterials in biological systems depends on both the nanomaterial properties and the exposure duration. Herein we used a multi-tier strategy to investigate the relationship between user-characterized multi-walled carbon nanotubes (MWCNTs) exposure duration and their induced biochemical and biomechanical effects on model human lung epithelial cells (BEAS-2B). Our results showed that exposure to MWCNTs leads to time-dependent intracellular uptake and generation of reactive oxygen species (ROS), along with time-dependent gradual changes in cellular biomechanical properties. In particular, the amount of internalized MWCNTs followed a sigmoidal curve with the majority of the MWCNTs being internalized within 6h of exposure; further, the sigmoidal uptake correlated with the changes in the oxidative levels and cellular biomechanical properties respectively. Our study provides new insights into the time-dependent induced toxicity caused by exposure to occupationally relevant doses of MWCNTs and could potentially help establish bases for early risk assessments of other nanomaterials toxicological profiles.

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“…[ 167 ] In general, multi‐walled CNTs are characterized by metallic behavior, whereas single‐walled CNTs (SWCNTs) are determined by their chirality. [ 168 ]…”

Section: Discontinuous Interface Modificationmentioning

confidence: 99%

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

Lehmann

Bahrami

et al. 2021

Advanced Energy Materials

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Thermoelectric (TE) materials are prominent candidates for energy converting applications due to their excellent performance and reliability. Extensive efforts for improving their efficiency in single‐/multi‐phase composites comprising nano/micro‐scale second phases are being made. The artificial decoration of second phases into the thermoelectric matrix in multi‐phase composites, which is distinguished from the second‐phase precipitation occurring during the thermally equilibrated synthesis of TE materials, can effectively enhance their performance. Theoretically, the interfacial manipulation of phase boundaries can be extended to a wide range of materials. High interface densities decrease thermal conductivity when nano/micro‐scale grain boundaries are obtained and certain electronic structure modifications may increase the power factor of TE materials. Based on the distribution of second phases on the interface boundaries, the strategies can be divided into discontinuous and continuous interfacial modifications. The discontinuous interfacial modifications section in this review discusses five parts chosen according to their dispersion forms, including metals, oxides, semiconductors, carbonic compounds, and MXenes. Alternatively, gas‐ and solution‐phase process techniques are adopted for realizing continuous surface changes, like the core–shell structure. This review offers a detailed analysis of the current state‐of‐the‐art in the field, while identifying possibilities and obstacles for improving the performance of TE materials.

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Electrical behavior of multi-walled carbon nanotube network embedded in amorphous silicon nitride

Cited by 18 publications

References 24 publications

Free and partially encapsulated manganese ferrite nanoparticles in multiwall carbon nanotubes

Free and partially encapsulated manganese ferrite nanoparticles in multiwall carbon nanotubes

Carbon nanotube uptake changes the biomechanical properties of human lung epithelial cells in a time-dependent manner

Current State‐of‐the‐Art in the Interface/Surface Modification of Thermoelectric Materials

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