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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Main Authors: Peter M. Wojcik, Negar Rajabi, Haoyu Zhu, David Estrada, Paul H. Davis, Twinkle Pandhi, I. Francis Cheng, David N. McIlroy
Format: Article
Language:English
Published: MDPI AG 2019-11-01
Series:Materials
Subjects:
Online Access:https://www.mdpi.com/1996-1944/12/22/3794
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spelling 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 &#176;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&#8722;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&#8722;80 &#176;C. The average resistivity of all 11 devices at 20 &#176;C was 4.3 &#177; 1.3 &#215; 10<sup>&#8722;3</sup> &#937; m. The GUITAR coated nanospring devices exhibited an average negative temperature coefficient of resistivity at 20 &#176;C of &#8722;0.0017 &#177; 0.00044 &#176;C<sup>&#8722;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 &#176;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&#8722;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&#8722;80 &#176;C. The average resistivity of all 11 devices at 20 &#176;C was 4.3 &#177; 1.3 &#215; 10<sup>&#8722;3</sup> &#937; m. The GUITAR coated nanospring devices exhibited an average negative temperature coefficient of resistivity at 20 &#176;C of &#8722;0.0017 &#177; 0.00044 &#176;C<sup>&#8722;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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