Systematic Study of the Effect of Incorporation of Carbon Nanotubes into Ge x Se 1-x Glass System
- PDF / 535,404 Bytes
- 8 Pages / 432 x 648 pts Page_size
- 50 Downloads / 137 Views
MRS Advances © 2020 Materials Research Society DOI: 10.1557/adv.2020.315
Systematic Study of the Effect of Incorporation of Carbon Nanotubes into GexSe1-x Glass System Chari Ramkumar1, John Rademacher1, John Adamick1, Jake Anderson1, David Hellman1, Mehdi Millot2, and Wayne Bresser1 1
Department of Physics, Geology and Engineering Technology, Northern Kentucky University, Highland Heights, Kentucky, USA.
2
Lannion Institute of Technology, University of Rennes 1, Lannion, Brittany, France.
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. 1
Downloaded from https://www.cambridge.org/core. Cornell University Library, on 17 Sep 2020 at 06:18:22, subject to the Cambridge Core terms of use, available at https://www.cambridge.org/core/terms. https://doi.org/10.1557/adv.2020.315
INTRODUCTION Carbon nanotubes (CNTs) are rolled sheets of carbon that can have many different physical properties and are being used today to improve current technologies in many different fields [1]. They are used as transistors, chemical and biological sensors, highly efficient field emission sources, probe for scanning electron microscopy, and filler in polymers. These potential applications are attributed to their exotic physical properties, such as high-aspect ratio (large length to small diameter), high tensile strength, anisotropic electrical conductivity and optical activity (ability to rotate the polarization vector). The nature of the rigid (stiffness) to floppy (flexible) phase (intermediate phase) transition in network glasses continues to be one of the central issues in glass science that could impact other areas of condensed-matter science [2].
Data Loading...
