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Systematic Study of the Effect of Incorporation of Carbon Nanotubes into GexSe1-x Glass System

Published online by Cambridge University Press:  19 August 2020

Chari Ramkumar
Affiliation:
Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky, USA.
John Rademacher
Affiliation:
Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky, USA.
John Adamick
Affiliation:
Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky, USA.
Jake Anderson
Affiliation:
Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky, USA.
David Hellman
Affiliation:
Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky, USA.
Mehdi Millot
Affiliation:
Lannion Institute of Technology, University of Rennes 1, Lannion, Brittany, France.
Wayne Bresser
Affiliation:
Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky, USA.
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Abstract

We have successfully synthesized GexSe1-x (x = 0.225) glass samples and incorporated commercially produced (Protein Mods) carbon nanotubes (CNTs) into the glass samples. We investigated the glass transition temperature (Tg) using modulated differential scanning calorimetry (MDSC). CNTs, being a very hygroscopic material as well as oxygen absorbing material, needed to be cleaned under vacuum with the hot water-bath to get rid of contaminants. We used contaminant-free CNTs for our study. The same cleaning process was used to prepare GexSe1-x (x = 0.225) glass samples with and without CNTs. The base GexSe1-x (x = 0.225) glass sample has a Tg of 220°C. The Tg was found to be independent of starting materials (germanium and selenium) from different sources as well as hot water-bath temperature. The Tg was found to be lower when 5% CNT's by mass was added to the base GexSe1-x (x = 0.225) glass sample. For 10% incorporation, the Tg was found to increase from that of 5% and it was found to decrease from that of 10% when 15% CNTs was added to the base glass sample. We also found that the Tg for GexSe1-x (x = 0.225) glass samples with the incorporation of 5% not-cleaned CNTs was 10oC higher, indicating the sensitivity of Tg on contaminants. Further, it was found that the variation of Tg with the incorporation of bulk carbon into the GexSe1-x (x = 0.225) glass samples was inconsistent compared to the contaminant-free CNTs incorporation.

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Articles
Copyright
Copyright © Materials Research Society 2020

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