Percolation Effects in Electrolytically Gated WS2/Graphene Nano:Nano Composites
| Autor: | Adam G. Kelly, Victor Vega-Mayoral, Jonathan N. Coleman, Andrew Harvey, Domhnall O’Suilleabhain |
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| Rok vydání: | 2019 |
| Předmět: |
Materials science
Graphene Nanoparticle Percolation threshold 02 engineering and technology Conductivity 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences law.invention Percolation theory Chemical physics law Percolation Nano General Materials Science 0210 nano-technology Nanosheet |
| Zdroj: | ACS Applied Materials & Interfaces |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.8b21416 |
| Popis: | Mixed networks of conducting and nonconducting nanoparticles show promise in a range of applications where fast charge transport is important. While the dependence of network conductivity on the loading level of conductive additive is well understood, little is known about the loading dependence of mobility and carrier density. This is particularly important as the addition of graphene might lead to increases in the mobility of semiconducting nanosheet network transistors. Here, we use electrolytic gating to investigate the transport properties of spray-coated composite networks of graphene and WS2 nanosheets. As the graphene loading is increased, we find that both conductivity and carrier density increase in line with the percolation theory with percolation thresholds (∼8 vol %) and exponents (∼2.5) consistent with previous reporting. Perhaps surprisingly, we find the mobility increases modestly from ∼0.1 cm2/V s (for a WS2 network) to ∼0.3 cm2/V s (for a graphene network) which we attribute to the simil... |
| Databáze: | OpenAIRE |
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