Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation State
The development of graphene quantum dots (GQDs) with low toxicity, excellent dispersibility, and high photostability has led to extensive progress in bio-imaging and optical sensing applications. However, one-pot synthesis and mass production of GQDs, and tuning their photoluminescence, remains a ch...
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MDPI AG
2022-09-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/15/19/6567 |
| _version_ | 1797478499697557504 |
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| author | Kwang Hyun Park Sung Ho Song |
| author_facet | Kwang Hyun Park Sung Ho Song |
| author_sort | Kwang Hyun Park |
| collection | DOAJ |
| description | The development of graphene quantum dots (GQDs) with low toxicity, excellent dispersibility, and high photostability has led to extensive progress in bio-imaging and optical sensing applications. However, one-pot synthesis and mass production of GQDs, and tuning their photoluminescence, remains a challenge. Here we demonstrate a simple and scalable method for fabricating GQDs with high size uniformity and chemical stability, via a sequential process of inserting alkali metal into graphite (Stage I: KC<sub>8</sub> and Stage II: KC<sub>24</sub>) and exfoliation to GQDs in a selected solvent. Structural and optical measurements were conducted, and the emitted colors of the as-prepared GQDs were blue (KC<sub>8</sub>) and yellow (KC<sub>24</sub>), respectively. The stage of graphite intercalation in the compounds played an important role in the size and thickness of the GQD. The as-prepared GQDs had clear characteristic peaks consistent with the quantum confinement effect and intrinsic/extrinsic states. Our approach will provide great potential for a wide variety of bioimaging and bioanalysis applications. |
| first_indexed | 2024-03-09T21:32:42Z |
| format | Article |
| id | doaj.art-afd9a92bf2084db6b4748453227daa8f |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T21:32:42Z |
| publishDate | 2022-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-afd9a92bf2084db6b4748453227daa8f2023-11-23T20:53:01ZengMDPI AGMaterials1996-19442022-09-011519656710.3390/ma15196567Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation StateKwang Hyun Park0Sung Ho Song1Division of Advanced Materials Engineering, Center for Advanced Materials and Parts of Powders, Kongju National University, Cheonan-si 31080, KoreaDivision of Advanced Materials Engineering, Center for Advanced Materials and Parts of Powders, Kongju National University, Cheonan-si 31080, KoreaThe development of graphene quantum dots (GQDs) with low toxicity, excellent dispersibility, and high photostability has led to extensive progress in bio-imaging and optical sensing applications. However, one-pot synthesis and mass production of GQDs, and tuning their photoluminescence, remains a challenge. Here we demonstrate a simple and scalable method for fabricating GQDs with high size uniformity and chemical stability, via a sequential process of inserting alkali metal into graphite (Stage I: KC<sub>8</sub> and Stage II: KC<sub>24</sub>) and exfoliation to GQDs in a selected solvent. Structural and optical measurements were conducted, and the emitted colors of the as-prepared GQDs were blue (KC<sub>8</sub>) and yellow (KC<sub>24</sub>), respectively. The stage of graphite intercalation in the compounds played an important role in the size and thickness of the GQD. The as-prepared GQDs had clear characteristic peaks consistent with the quantum confinement effect and intrinsic/extrinsic states. Our approach will provide great potential for a wide variety of bioimaging and bioanalysis applications.https://www.mdpi.com/1996-1944/15/19/6567graphene quantum dotgraphite intercalation compoundphotoluminescencealkali metalexfoliation |
| spellingShingle | Kwang Hyun Park Sung Ho Song Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation State Materials graphene quantum dot graphite intercalation compound photoluminescence alkali metal exfoliation |
| title | Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation State |
| title_full | Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation State |
| title_fullStr | Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation State |
| title_full_unstemmed | Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation State |
| title_short | Graphene Quantum Dots with Blue and Yellow Luminescence Fabricated by Modulating Intercalation State |
| title_sort | graphene quantum dots with blue and yellow luminescence fabricated by modulating intercalation state |
| topic | graphene quantum dot graphite intercalation compound photoluminescence alkali metal exfoliation |
| url | https://www.mdpi.com/1996-1944/15/19/6567 |
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