Loading...
Please wait, while we are loading the content...
Similar Documents
Extreme temperature stability of thermally insulating graphene-mesoporous-silicon nanocomposite
| Content Provider | Scilit |
|---|---|
| Author | Kolhatkar, Gitanjali Boucherif, Abderraouf Boucherif, Abderrahim Rahim Dupuy, Arthur Fréchette, Luc G. Arès, Richard Ruediger, Andreas |
| Copyright Year | 2018 |
| Description | Journal: Nanotechnology We demonstrate the thermal stability and thermal insulation of graphene-mesoporous silicon nanocomposites. By comparing the morphology of graphene-mesoporous silicon nanocomposite carbonized at 650°C as-formed to that after annealing, we show that this nanocomposite remains stable at temperatures as high as 1050°C due to the presence of a few monolayers of graphene coating on the pore walls. This does not only make this material compatible with most thermal processes but also suggests applications in harsh high temperature environments. The thermal conductivity of graphene-mesoporous silicon nanocomposites carbonized at temperatures in the 500-800°C range is determined through Raman spectroscopy measurements. They indicate that the thermal conductivity of the composite is interestingly low in comparison to that of silicon, with a value of 13 ± 1 W/mK at room temperature, and not affected by the thin graphene layer, suggesting a role of the high concentration of carbon related-defects as indicated by the high intensity of the D-band compared to G-band of the Raman spectra. This morphological stability at high temperature combined with a high thermal insulation make graphene-mesoporous silicon nanocomposite a promising candidate for a broad range of applications including microelectromechanical systems and thermal effect microsystems such as flow sensors or IR detectors. Finally, at 120°C, the thermal conductivity remains equal to that at room temperature, attesting to the potential of using our nanocomposite in devices that operate at high temperatures such as microreactors for distributed chemical conversion, solid oxide fuel cells, thermoelectric devices or thermal micromotors. |
| Related Links | http://iopscience.iop.org/article/10.1088/1361-6528/aaac40/pdf |
| ISSN | 09574484 |
| e-ISSN | 13616528 |
| DOI | 10.1088/1361-6528/aaac40 |
| Journal | Nanotechnology |
| Issue Number | 14 |
| Volume Number | 29 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2018-02-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Nanotechnology Composite Materials Raman Spectroscopy Graphene Mesoporous Silicon Nanocomposite Thermal Conductivity Thermal Insulation Thermal Stability |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Nanoscience and Nanotechnology Mechanics of Materials Mechanical Engineering Bioengineering Electrical and Electronic Engineering |
