Graphene assisted terahertz metamaterials for sensitive bio-sensing
| Autor: | Sukang Bae, Sang-Hun Lee, Q-Han Park, Jong-Ho Choe, Jin Soo Kim, Minah Seo, Chulki Kim |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Terahertz radiation 02 engineering and technology 010402 general chemistry 01 natural sciences law.invention law Materials Chemistry Electrical and Electronic Engineering Absorption (electromagnetic radiation) Instrumentation chemistry.chemical_classification business.industry Graphene Biomolecule Metals and Alloys Metamaterial Resonance 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Wavelength chemistry Optoelectronics 0210 nano-technology business Biosensor |
| Zdroj: | Sensors and Actuators B: Chemical. 310:127841 |
| ISSN: | 0925-4005 |
| Popis: | We report that single-stranded deoxyribonucleic acids (ssDNAs) at very low concentrations can be detected using graphene-combined nano-slot-based terahertz (THz) resonance. A combination of the resonant structure and tuned electro-optical properties of graphene can provide unprecedentedly sensitive biomolecule sensing even using very low energy THz photons, overcoming the huge scale difference of 10,000:1 between the wavelength and the size of the ssDNAs. Ultrahigh sensitivity is obtained by the significant increase in the absorption cross-section of the graphene sheet with the targeted biomolecules, induced by strong THz field enhancement at the resonance frequency inside the slots. Clearly distinguishable THz optical signals were observed between different species of ssDNAs even at the nano-mole level and analyzed quantitatively in terms of the electro-optical properties of the suspended graphene layer modified by the attached ssDNAs without any molecular-specific labeling for the THz regime. Quantitative analysis of ssDNA molecule adsorption was carried based on the change in conductivity using a theoretical THz transmission model. |
| Databáze: | OpenAIRE |
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