Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite
A graphitic carbon, referred to as graphite from the University of Idaho thermolyzed asphalt reaction (GUITAR), was coated in silica nanosprings and silicon substrates via the pyrolysis of commercial roofing tar at 800 °C in an inert atmosphere. Scanning electron microscopy and transmission...
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doaj-d82a94a62d7e4881a9b97a2b326f0a062020-11-25T02:21:19ZengMDPI AGMaterials1996-19442019-11-011222379410.3390/ma12223794ma12223794Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline GraphitePeter M. Wojcik0Negar Rajabi1Haoyu Zhu2David Estrada3Paul H. Davis4Twinkle Pandhi5I. Francis Cheng6David N. McIlroy7Department of Physics, University of Idaho, Moscow, ID 83844, USADepartment of Physics, University of Idaho, Moscow, ID 83844, USADepartment of Chemistry, University of Idaho, Moscow, ID 83844, USAMicron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USAMicron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USAMicron School of Materials Science and Engineering, Boise State University, Boise, ID 83725, USADepartment of Chemistry, University of Idaho, Moscow, ID 83844, USADepartment of Physics, Oklahoma State University, Stillwater, OK 74074, USAA graphitic carbon, referred to as graphite from the University of Idaho thermolyzed asphalt reaction (GUITAR), was coated in silica nanosprings and silicon substrates via the pyrolysis of commercial roofing tar at 800 °C in an inert atmosphere. Scanning electron microscopy and transmission electron microscopy images indicate that GUITAR is an agglomeration of carbon nanospheres formed by the accretion of graphitic flakes into a ~100 nm layer. Raman spectroscopic analyses, in conjunction with scanning electron microscopy and transmission electron microscopy, indicate that GUITAR has a nanocrystalline structure consisting of ~1−5 nm graphitic flakes interconnected by amorphous sp<sup>3</sup> bonded carbon. The electrical resistivities of 11 single GUITAR-coated nanospring devices were measured over a temperature range of 10−80 °C. The average resistivity of all 11 devices at 20 °C was 4.3 ± 1.3 × 10<sup>−3</sup> Ω m. The GUITAR coated nanospring devices exhibited an average negative temperature coefficient of resistivity at 20 °C of −0.0017 ± 0.00044 °C<sup>−1</sup>, which is consistent with the properties of nanocrystalline graphite.https://www.mdpi.com/1996-1944/12/22/3794nanocrystalline graphitenanospringsnanocoilsnanowirestcor (temperature coefficient of resistivity)raman spectroscopysem (scanning electron microscopy)tem (transmission electron microscopy) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Peter M. Wojcik Negar Rajabi Haoyu Zhu David Estrada Paul H. Davis Twinkle Pandhi I. Francis Cheng David N. McIlroy |
spellingShingle |
Peter M. Wojcik Negar Rajabi Haoyu Zhu David Estrada Paul H. Davis Twinkle Pandhi I. Francis Cheng David N. McIlroy Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite Materials nanocrystalline graphite nanosprings nanocoils nanowires tcor (temperature coefficient of resistivity) raman spectroscopy sem (scanning electron microscopy) tem (transmission electron microscopy) |
author_facet |
Peter M. Wojcik Negar Rajabi Haoyu Zhu David Estrada Paul H. Davis Twinkle Pandhi I. Francis Cheng David N. McIlroy |
author_sort |
Peter M. Wojcik |
title |
Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite |
title_short |
Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite |
title_full |
Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite |
title_fullStr |
Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite |
title_full_unstemmed |
Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite |
title_sort |
utilizing a single silica nanospring as an insulating support to characterize the electrical transport and morphology of nanocrystalline graphite |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-11-01 |
description |
A graphitic carbon, referred to as graphite from the University of Idaho thermolyzed asphalt reaction (GUITAR), was coated in silica nanosprings and silicon substrates via the pyrolysis of commercial roofing tar at 800 °C in an inert atmosphere. Scanning electron microscopy and transmission electron microscopy images indicate that GUITAR is an agglomeration of carbon nanospheres formed by the accretion of graphitic flakes into a ~100 nm layer. Raman spectroscopic analyses, in conjunction with scanning electron microscopy and transmission electron microscopy, indicate that GUITAR has a nanocrystalline structure consisting of ~1−5 nm graphitic flakes interconnected by amorphous sp<sup>3</sup> bonded carbon. The electrical resistivities of 11 single GUITAR-coated nanospring devices were measured over a temperature range of 10−80 °C. The average resistivity of all 11 devices at 20 °C was 4.3 ± 1.3 × 10<sup>−3</sup> Ω m. The GUITAR coated nanospring devices exhibited an average negative temperature coefficient of resistivity at 20 °C of −0.0017 ± 0.00044 °C<sup>−1</sup>, which is consistent with the properties of nanocrystalline graphite. |
topic |
nanocrystalline graphite nanosprings nanocoils nanowires tcor (temperature coefficient of resistivity) raman spectroscopy sem (scanning electron microscopy) tem (transmission electron microscopy) |
url |
https://www.mdpi.com/1996-1944/12/22/3794 |
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