Deep Ultraviolet Photoluminescence of Water-soluble Self-Passivated ...
(Supporting Information)
Deep Ultraviolet Photoluminescence of Water-soluble Self-Passivated Graphene Quantum Dots §
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Libin Tang,†,‡ Rongbin Ji,‡ Xiangke Cao, Jingyu Lin, Hongxing Jiang, Xueming Li, Kar Seng Teng,⊥ Chi Man Luk,† Songjun Zeng,† Jianhua Hao† and Shu Ping Lau† ∗
† Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong SAR.
‡ Kunming Institute of Physics, Kunming, 650223, Yunnan Province, P.R. China.
§Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, USA
Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, P.R. China
⊥ Multidisciplinary Nanotechnology Center, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, United Kingdom
∗
To whom correspondence should be addressed. E-mail: [email protected].
S1
Supplementary Experimental Details Microwave Oven: Galanz P70B17L-T1. Chemicals: Glucose(≥99.5%), sucrose(≥99.5%), and fructose(≥99%) were purchased from SigmaAldrich without further purifying.
Supplementary Figures
Figure S1. The HRTEM image of the GQDs prepared using 11.1 wt.% glucose solution for 1 min microwave heating at 595W. The average size is 1.65 nm.
S2
Figure S2. The XRD patterns of the GQDs. The broad diffraction peaks are due to small size of the GQDs. The GQDs were prepared using 11.1 wt.% glucose solutions for 1-11 min microwave heating at 595 W.
S3
Figure S3. (a) TEM image of the GQDs prepared using 11.1 wt.% glucose solution and 9 min microwave heating at 595W; (b) is the diameter distribution of the GQDs, the red line is the Gaussian fitting curve. The average size is 21 nm.
Figure S4. AFM image, height analysis and height distribution of the GQDs. (a) and (b) are AFM images of the GQDs; (c) height analysis of the typical GQDs in the AFM image (a); (d) height distribution of the GQDs in AFM image (b). The GQDs were prepared using 11.1 wt.% glucose solution and 3 min microwave heating at 595W. S4
Figure S5. The PL quantum yields (QYs) of the GQDs prepared as a function of microwave heating time.
Figure S6. Schematic diagram of the electronic transitions in the GQDs.
S5
Deep Ultraviolet Photoluminescence of Water-soluble Self-Passivated Graphene Quantum Dots §
§
§
Libin Tang,†,‡ Rongbin Ji,‡ Xiangke Cao, Jingyu Lin, Hongxing Jiang, Xueming Li, Kar Seng Teng,⊥ Chi Man Luk,† Songjun Zeng,† Jianhua Hao† and Shu Ping Lau† ∗
† Department of Applied Physics, The Hong Kong Polytechnic University, Hong Kong SAR.
‡ Kunming Institute of Physics, Kunming, 650223, Yunnan Province, P.R. China.
§Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, USA
Solar Energy Research Institute, Yunnan Normal University, Kunming 650092, P.R. China
⊥ Multidisciplinary Nanotechnology Center, School of Engineering, University of Wales Swansea, Singleton Park, Swansea SA2 8PP, United Kingdom
∗
To whom correspondence should be addressed. E-mail: [email protected].
S1
Supplementary Experimental Details Microwave Oven: Galanz P70B17L-T1. Chemicals: Glucose(≥99.5%), sucrose(≥99.5%), and fructose(≥99%) were purchased from SigmaAldrich without further purifying.
Supplementary Figures
Figure S1. The HRTEM image of the GQDs prepared using 11.1 wt.% glucose solution for 1 min microwave heating at 595W. The average size is 1.65 nm.
S2
Figure S2. The XRD patterns of the GQDs. The broad diffraction peaks are due to small size of the GQDs. The GQDs were prepared using 11.1 wt.% glucose solutions for 1-11 min microwave heating at 595 W.
S3
Figure S3. (a) TEM image of the GQDs prepared using 11.1 wt.% glucose solution and 9 min microwave heating at 595W; (b) is the diameter distribution of the GQDs, the red line is the Gaussian fitting curve. The average size is 21 nm.
Figure S4. AFM image, height analysis and height distribution of the GQDs. (a) and (b) are AFM images of the GQDs; (c) height analysis of the typical GQDs in the AFM image (a); (d) height distribution of the GQDs in AFM image (b). The GQDs were prepared using 11.1 wt.% glucose solution and 3 min microwave heating at 595W. S4
Figure S5. The PL quantum yields (QYs) of the GQDs prepared as a function of microwave heating time.
Figure S6. Schematic diagram of the electronic transitions in the GQDs.
S5
