Utilizing a Single Silica Nanospring as an Insulating Support to Characterize the Electrical Transport and Morphology of Nanocrystalline Graphite
Autor: | Peter M. Wojcik, Negar Rajabi, Haoyu Zhu, David Estrada, Paul H. Davis, Twinkle Pandhi, I. Francis Cheng, David N. McIlroy |
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Jazyk: | angličtina |
Rok vydání: | 2019 |
Předmět: |
nanocrystalline graphite
nanosprings nanocoils nanowires tcor (temperature coefficient of resistivity) raman spectroscopy sem (scanning electron microscopy) tem (transmission electron microscopy) Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
Zdroj: | Materials, Vol 12, Iss 22, p 3794 (2019) |
Druh dokumentu: | article |
ISSN: | 1996-1944 12223794 |
DOI: | 10.3390/ma12223794 |
Popis: | 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 sp3 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 × 10−3 Ω m. The GUITAR coated nanospring devices exhibited an average negative temperature coefficient of resistivity at 20 °C of −0.0017 ± 0.00044 °C−1, which is consistent with the properties of nanocrystalline graphite. |
Databáze: | Directory of Open Access Journals |
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