Graphene Quantum Dot Solid Sheets: Strong blue-light-emitting & photocurrent-producing band-gap-opened nanostructures
| Autor: | Ganapathi Bharathi, Kittusamy Senthilkumar, Mukul Gupta, Sellan Premkumar, Deodatta M. Phase, T. Daniel Thangadurai, Devaraj Nataraj, Murugaiyan Sowmiya, Debnath Bhattacharyya, Shambhu Nath Jha, N. Patra, O.Y. Khyzhun |
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| Rok vydání: | 2017 |
| Předmět: |
Photoluminescence
Materials science Band gap lcsh:Medicine Quantum yield 02 engineering and technology 010402 general chemistry 01 natural sciences Article law.invention law lcsh:Science Absorption (electromagnetic radiation) Photocurrent Multidisciplinary Graphene business.industry lcsh:R 021001 nanoscience & nanotechnology Graphene quantum dot 0104 chemical sciences Quantum dot Optoelectronics lcsh:Q 0210 nano-technology business |
| Zdroj: | Scientific Reports, Vol 7, Iss 1, Pp 1-17 (2017) Scientific Reports |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-017-10534-4 |
| Popis: | Graphene has been studied intensively in opto-electronics, and its transport properties are well established. However, efforts to induce intrinsic optical properties are still in progress. Herein, we report the production of micron-sized sheets by interconnecting graphene quantum dots (GQDs), which are termed ‘GQD solid sheets’, with intrinsic absorption and emission properties. Since a GQD solid sheet is an interconnected QD system, it possesses the optical properties of GQDs. Metal atoms that interconnect the GQDs in the bottom-up hydrothermal growth process, induce the semiconducting behaviour in the GQD solid sheets. X-ray absorption measurements and quantum chemical calculations provide clear evidence for the metal-mediated growth process. The as-grown graphene quantum dot solids undergo a Forster Resonance Energy Transfer (FRET) interaction with GQDs to exhibit an unconventional 36% photoluminescence (PL) quantum yield in the blue region at 440 nm. A high-magnitude photocurrent was also induced in graphene quantum dot solid sheets by the energy transfer process. |
| Databáze: | OpenAIRE |
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