Mechanofluorochromic Carbon Nanodots: Controllable Pressure‐Triggered Blue‐ and Red‐Shifted Photoluminescence |
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| Authors: | Dr. Cui Liu Dr. Guanjun Xiao Mengli Yang Prof. Bo Zou Prof. Zhi‐Ling Zhang Prof. Dai‐Wen Pang |
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| Affiliation: | 1. Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, and the Institute for Advanced Studies, Wuhan University, Wuhan, China;2. Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Centre for Intelligent Sensing Technology, College of Optoelectronic Engineering, Chongqing University, Chongqing, China;3. State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun, China |
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| Abstract: | Mechanofluorochromic materials, which change their photoluminescence (PL) colors in responding to mechanical stimuli, can be used as mechanosensors, security papers, and photoelectronic devices. However, traditional mechanofluorochromic materials can only be adjusted to a monotone direction upon the external stimuli. Controllable pressure‐triggered blue‐ and red‐shifted PL is reported for C‐dots. The origin of mechanofluorochromism (MFC) in C‐dots is interpreted based on structure–property relationships. The carbonyl group and the π‐conjugated system play key roles in the PL change of C‐dots under high pressure. As the pressure increases, the enhanced π–π stacking of the π‐conjugated system causes the red‐shift of PL, while the conversion of carbonyl groups eventually induces a blue‐shift. Together with their low toxicity, good hydrophilicity, and small size, the tunable MFC property would boost various potential applications of C‐dots. |
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| Keywords: | carbon nanodots high pressure mechanofluorochromism photoluminescence mechanism |
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