Technological advances of graphene solution-gated field-effect transistors for biosensing applications
In response to the growing need for highly sensitive, selective, and stable devices for biomedical applications, this thesis focuses on developing graphene Solution-Gated Field-Effect transistors (gSGFETs) for biosensing. Graphene’s combination of electrical performance, biocompatibility, and surfac...
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| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/452108 |
| Acceso en línea: | https://hdl.handle.net/2117/452108 |
| Access Level: | acceso abierto |
| Palabra clave: | Graphene Field-effect transistors Biosensors GSGFET Alumina (Al2O3) ALD Biosensing applications Grafè Transistors d'efecte de camp Àrees temàtiques de la UPC::Enginyeria electrònica::Components electrònics::Transistors |
| Sumario: | In response to the growing need for highly sensitive, selective, and stable devices for biomedical applications, this thesis focuses on developing graphene Solution-Gated Field-Effect transistors (gSGFETs) for biosensing. Graphene’s combination of electrical performance, biocompatibility, and surface sensitivity makes it ideal for detecting biological analytes. A key aspect of gSGFETs is the passivation layer, which isolates the device from the electrolyte while allowing access to the active channel. Conventional materials like SU-8 offer biocompatibility but suffer from limited chemical stability. Alternatively, the use of alumina (Al₂O₃), deposited by atomic layer deposition (ALD), has been demonstrated to be a suitable alternative. This work investigates the implementation of the alumina passivation strategy in the IMB-CNM clean room. The fabricated devices were characterized both morphologically and electrically, and benchmarked against SU-8-based and commercial technologies. They showed reduced gate leakage and improved chemical robustness, supporting their suitability for long-term biosensing applications and functionalization processes. |
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