Graphene as a functional layer for semiconducting carbon nanotube transistor sensors
| Autor: | Chien-Fu Chen, Peng Wang, Allen L. Ng, Hyejin Kwon, Zhiwei Peng, Cheng S. Lee, YuHuang Wang |
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| Rok vydání: | 2017 |
| Předmět: |
Electron mobility
Materials science Graphene Selective chemistry of single-walled nanotubes chemistry.chemical_element Nanotechnology 02 engineering and technology General Chemistry Carbon nanotube 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Article 0104 chemical sciences law.invention chemistry law Nanosensor Thin-film transistor General Materials Science Thin film 0210 nano-technology Carbon |
| Zdroj: | Carbon. 125:49-55 |
| ISSN: | 0008-6223 |
| Popis: | Single-walled carbon nanotubes (SWCNTs) hold vast potential for future electronic devices due to their outstanding properties, however covalent functionalization often destroys the intrinsic properties of SWCNTs, thus limiting their full potential. Here, we demonstrate the fabrication of a functionalized graphene/semiconducting SWCNT (T@fG) heterostructured thin film transistor as a chemical sensor. In this structural configuration, graphene acts as an atom-thick, impermeable layer that can be covalently functionalized via facile diazonium chemistry to afford a high density of surface functional groups while protecting the underlying SWCNT network from chemical modification, even during a covalent chemical reaction. As a result, the highly functionalized carbon-based hybrid structure exhibits excellent transistor properties with a carrier mobility and ON/OFF ratio as high as 64 cm2/Vs and 5400, respectively. To demonstrate its use in potential applications, T@fG thin films were fabricated as aqueous ammonium sensors exhibiting a detection limit of 0.25 μM in a millimolar ionic strength solution, which is comparable with state-of-the-art aqueous ammonium nanosensors. |
| Databáze: | OpenAIRE |
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