Synthesis and Characterization of Glassy Carbon Nanowires

Lentz, C. M.; Samuel, B. A.; Foley, Henry C.; Haque, M. Shamsul

doi:10.1155/2011/129298

Cited by 23 publications

(17 citation statements)

References 37 publications

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“…Moreover, the I-V curve non-linearity presented in Fig. 2a can be explained by the fact that electric transport in disordered carbons like glassy carbon is generally caused by thermally-activated, hopping conduction [37][38][39][40].…”

Section: Electrical Probing Of Carbon Nanofibersmentioning

confidence: 99%

Nanogap fabrication by Joule heating of electromechanically spun suspended carbon nanofibers

Salazar

Cardenas‐Benitez

Pramanick

et al. 2017

Carbon

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We present Suspended Carbon Nanofibers featuring a central nanometric gap fabricated by integration of Electro-Mechanical Spinning, pyrolysis of ultraviolet-cured microstructures and a Joule heating process. Photopatterned walls were used to suspend polymeric electrospun fibers based on a solution of SU-8. After pyrolysis, the complete structure was converted into a monolithic carbon microstructure featuring stable ohmic contact between the suspended fibers and the supporting walls without the need of further processing. By applying an electrical bias through the electrodes, the wire can be gradually thinned by excessive Joule heating, eventually forming a nanogap. The maximum supported current density in the fibers was found to be of the order of 10 5 A/cm 2 . Furthermore, the electrical characteristics of carbon nanofibers and the dimensions of the nanogaps were demonstrated to be dependent on the length of the fiber and atmosphere conditions, i.e. air or vacuum. A finite element simulation was used to gain insight into the influence of length on nanogap size. The shorter fibers modeled portrayed a significantly steeper temperature gradient, which agrees with the experimental observation of smaller gaps.The presented method facilitates an inexpensive manufacturing technique of nanogaps as small as 12 nm, holding potential for the preparation molecular electronics devices.

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Section: Electrical Probing Of Carbon Nanofibersmentioning

confidence: 99%

Nanogap fabrication by Joule heating of electromechanically spun suspended carbon nanofibers

Salazar

Cardenas‐Benitez

Pramanick

et al. 2017

Carbon

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“…Therefore, the possibility to control the temperature-induced structural transformation is critically important for the fabrication of the glassy carbon products with desired functional features. It is essential to note that novel glassy carbon applications, such as micro-electro-mechanical systems [13,14], that can be used for medical prostheses [15,16] require comprehensive characterization of the properties-structure relationships at both, bulk-and nanoscale level. But up to now, the knowledge on how the manufacturing temperature, that is, how the internal structure affects the properties of glassy carbons is insufficient.…”

Section: Introductionmentioning

confidence: 99%

Evolution of glassy carbon under heat treatment: correlation structure–mechanical properties

et al. 2017

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In order to accommodate an increasing demand for glassy carbon products with tailored characteristics, one has to understand the origin of their structure-related properties. In this work, through the use of high-resolution transmission electron microscopy, Raman spectroscopy, and electron energy loss spectroscopy it has been demonstrated that the structure of glassy carbon at different stages of the carbonization process resembles the curvature observed in fragments of nanotubes, fullerenes, or nanoonions. The measured nanoindentation hardness and reduced Young's modulus change as a function of the pyrolysis temperature from the range of 600-2500°C and reach maximum values for carbon pyrolyzed at around 1000°C. Essentially, the highest values of the mechanical parameters for glassy carbon manufactured at that temperature can be related to the greatest amount of non-planar sp 2 -hybridized carbon atoms involved in the formation of curved graphene-like layers. Such complex labyrinth-like structure with sp 2 -type bonding would be rigid and hard to break that explains the glassy carbon high strength and hardness.

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“…While turbo-stratic to nanocrystalline phase transformation at relatively lower temperature in MoS 2 is remarkable, it is not energetically forbidden as seen in literature for carbonaceous materials albeit at higher temperatures. 29 A rather challenging and long lasting problem lies in amorphous specimens that typically require impractical magnitudes of temperature and pressure. 30 Figure 3 shows the experimental results with in-situ TEM annealing of the amorphous BN films at 600 C for 30 min.…”

mentioning

confidence: 99%

Domain engineering of physical vapor deposited two-dimensional materials

Alam

Wang

Pulavarthy

et al. 2014

Applied Physics Letters

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Physical vapor deposited two-dimensional (2D) materials span larger areas compared to exfoliated flakes, but suffer from very small grain or domain sizes. In this letter, we fabricate freestanding molybdenum disulfide (MoS2) and amorphous boron nitride (BN) specimens to expose both surfaces. We performed in situ heating in a transmission electron microscope to observe the domain restructuring in real time. The freestanding MoS2 specimens showed up to 100× increase in domain size, while the amorphous BN transformed in to polycrystalline hexagonal BN (h-BN) at temperatures around 600 °C much lower than the 850–1000 °C range cited in the literature.

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Synthesis and Characterization of Glassy Carbon Nanowires

Cited by 23 publications

References 37 publications

Nanogap fabrication by Joule heating of electromechanically spun suspended carbon nanofibers

Nanogap fabrication by Joule heating of electromechanically spun suspended carbon nanofibers

Evolution of glassy carbon under heat treatment: correlation structure–mechanical properties

Domain engineering of physical vapor deposited two-dimensional materials

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