Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties
Low-cost and earth-abundant coal has been considered to have a unique structural superiority as carbon sources of carbon quantum dots (CQDs). However, it is still difficult to obtain CQDs from raw coal due to its compactibility and lower reactivity, and the majority of the current coal-based CQDs us...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2020-02-01
|
| Series: | Frontiers in Chemistry |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/fchem.2020.00123/full |
| id |
doaj-479654c195594159b52d9062b46f9c02 |
|---|---|
| record_format |
Article |
| spelling |
doaj-479654c195594159b52d9062b46f9c022020-11-25T03:48:32ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462020-02-01810.3389/fchem.2020.00123525673Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence PropertiesJianbo Jia0Jianbo Jia1Yue Sun2Yaojie Zhang3Quanrun Liu4Jianliang Cao5Guangxu Huang6Guangxu Huang7Baolin Xing8Baolin Xing9Chuanxiang Zhang10Chuanxiang Zhang11Lina Zhang12Yijun Cao13Henan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, ChinaHenan Key Laboratory of Coal Green Conversion, College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo, ChinaHenan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou, ChinaLow-cost and earth-abundant coal has been considered to have a unique structural superiority as carbon sources of carbon quantum dots (CQDs). However, it is still difficult to obtain CQDs from raw coal due to its compactibility and lower reactivity, and the majority of the current coal-based CQDs usually emit green or blue fluorescence. Herein, a facile two-step oxidation approach (K2FeO4 pre-oxidation and H2O2 oxidation) was proposed to fabricate bandgap tunable CQDs from anthracite. The K2FeO4 pre-oxidation can not only weaken the non-bonding forces among coal molecules which cause the expansion of coal particles, but also form a large number of active sites on the surface of coal particles. The above effects make the bandgap tunable CQDs (blue, green, or yellow fluorescence) can be quickly obtained from anthracite within 1 h in the following H2O2 oxidation by simply adjusting the concentration of H2O2. All the as-prepared CQDs contain more than 30 at% oxygen, and the average diameters of which are <10 nm. The results also indicate that the high oxygen content only can create new energy states inside the band gap of CQDs with average diameter more than 3.2 ± 0.9 nm, which make the as-prepared CQDs emit green or yellow fluorescence.https://www.frontiersin.org/article/10.3389/fchem.2020.00123/fullcarbon quantum dotscoalphotoluminescentanthracitebandgap engineering |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Jianbo Jia Jianbo Jia Yue Sun Yaojie Zhang Quanrun Liu Jianliang Cao Guangxu Huang Guangxu Huang Baolin Xing Baolin Xing Chuanxiang Zhang Chuanxiang Zhang Lina Zhang Yijun Cao |
| spellingShingle |
Jianbo Jia Jianbo Jia Yue Sun Yaojie Zhang Quanrun Liu Jianliang Cao Guangxu Huang Guangxu Huang Baolin Xing Baolin Xing Chuanxiang Zhang Chuanxiang Zhang Lina Zhang Yijun Cao Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties Frontiers in Chemistry carbon quantum dots coal photoluminescent anthracite bandgap engineering |
| author_facet |
Jianbo Jia Jianbo Jia Yue Sun Yaojie Zhang Quanrun Liu Jianliang Cao Guangxu Huang Guangxu Huang Baolin Xing Baolin Xing Chuanxiang Zhang Chuanxiang Zhang Lina Zhang Yijun Cao |
| author_sort |
Jianbo Jia |
| title |
Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties |
| title_short |
Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties |
| title_full |
Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties |
| title_fullStr |
Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties |
| title_full_unstemmed |
Facile and Efficient Fabrication of Bandgap Tunable Carbon Quantum Dots Derived From Anthracite and Their Photoluminescence Properties |
| title_sort |
facile and efficient fabrication of bandgap tunable carbon quantum dots derived from anthracite and their photoluminescence properties |
| publisher |
Frontiers Media S.A. |
| series |
Frontiers in Chemistry |
| issn |
2296-2646 |
| publishDate |
2020-02-01 |
| description |
Low-cost and earth-abundant coal has been considered to have a unique structural superiority as carbon sources of carbon quantum dots (CQDs). However, it is still difficult to obtain CQDs from raw coal due to its compactibility and lower reactivity, and the majority of the current coal-based CQDs usually emit green or blue fluorescence. Herein, a facile two-step oxidation approach (K2FeO4 pre-oxidation and H2O2 oxidation) was proposed to fabricate bandgap tunable CQDs from anthracite. The K2FeO4 pre-oxidation can not only weaken the non-bonding forces among coal molecules which cause the expansion of coal particles, but also form a large number of active sites on the surface of coal particles. The above effects make the bandgap tunable CQDs (blue, green, or yellow fluorescence) can be quickly obtained from anthracite within 1 h in the following H2O2 oxidation by simply adjusting the concentration of H2O2. All the as-prepared CQDs contain more than 30 at% oxygen, and the average diameters of which are <10 nm. The results also indicate that the high oxygen content only can create new energy states inside the band gap of CQDs with average diameter more than 3.2 ± 0.9 nm, which make the as-prepared CQDs emit green or yellow fluorescence. |
| topic |
carbon quantum dots coal photoluminescent anthracite bandgap engineering |
| url |
https://www.frontiersin.org/article/10.3389/fchem.2020.00123/full |
| work_keys_str_mv |
AT jianbojia facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT jianbojia facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT yuesun facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT yaojiezhang facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT quanrunliu facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT jianliangcao facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT guangxuhuang facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT guangxuhuang facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT baolinxing facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT baolinxing facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT chuanxiangzhang facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT chuanxiangzhang facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT linazhang facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties AT yijuncao facileandefficientfabricationofbandgaptunablecarbonquantumdotsderivedfromanthraciteandtheirphotoluminescenceproperties |
| _version_ |
1724498503852359680 |