Laser wavelength modulated pulsed laser ablation for selective and efficient production of graphene quantum dots
| Autor: | HyukSu Han, Jeong Ho Ryu, Kyung Hwan Jung, Kwang Bo Shim, Kang Min Kim, Suk Hyun Kang, Byoung-Soo Lee |
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| Rok vydání: | 2019 |
| Předmět: |
Photoluminescence
Materials science business.industry Graphene General Chemical Engineering Oxide Coulomb explosion 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Laser 01 natural sciences 0104 chemical sciences Nanomaterials law.invention chemistry.chemical_compound Wavelength chemistry Quantum dot law Optoelectronics 0210 nano-technology business |
| Zdroj: | RSC advances. 9(24) |
| ISSN: | 2046-2069 |
| Popis: | Graphene quantum dots (GQDs) and graphene oxide quantum dots (GOQDs) can be used in different applications such as optoelectronic and biomedical applications, respectively. Hence, the selective synthesis of GQDs and GOQDs is highly desirable but challenging. Here, we present GQDs and GOQDs selectively prepared by an easy and simple pulsed laser ablation in liquid (PLAL) method by controlling the laser wavelength. The obtained GQDs and GOQDs showed a significantly different optoelectronic nature mainly due to the existence of surface oxygen-rich functional groups (e.g. carboxyl or hydroxy groups). Also, we described a possible mechanism for the formation of oxygen functional groups during the PLAL process based on the Coulomb explosion model, which can give further insight for designing functional carbon materials. |
| Databáze: | OpenAIRE |
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