Mechanofluorochromic Carbon Nanodots: Controllable Pressure‐Triggered Blue‐ and Red‐Shifted Photoluminescence

Liu, Cui; Xiao, Guanjun; Yang, Mei; Zou, Bo; Zhang, Zhiling; Pang, Dai‐Wen

doi:10.1002/anie.201711409

Cited by 101 publications

(64 citation statements)

References 49 publications

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“…These results demonstrate that the F,N‐doped CDs has a reversible piezochromism effect. The fluorescence emission of F,N‐doped CDs show a blue‐shift and red‐shift in response to the process of compression and decompression, which may be caused by numerous defects on the surface of the F,N‐doped CDs . Since the F,N‐doped CDs showed excellent photostability and biocompatibility, CHO cells and HepG2 cells were used to detect the cytotoxicity by MTT assay and cell imaging effect of the samples (Supporting Information, Figures S8–S10).…”

Section: Figurementioning

confidence: 63%

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

Jiang

Ding

et al. 2019

Angewandte Chemie

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Photoactivation in CdSe/ZnS quantum dots (QDs) on UV/Vis light exposure improves photoluminescence (PL) and photostability. However, it was not observed in fluorescent carbon quantum dots (CDs). Now, photoactivated fluorescence enhancement in fluorine and nitrogen co‐doped carbon dots (F,N‐doped CDs) is presented. At 1.0 atm, the fluorescence intensity of F,N‐doped CDs increases with UV light irradiation (5 s–30 min), accompanied with a blue‐shift of the fluorescence emission from 586 nm to 550 nm. F,N‐doped CDs exhibit photoactivated fluorescence enhancement when exposed to UV under high pressure (0.1 GPa). F,N‐doped CDs show reversible piezochromic behavior while applying increasing pressure (1.0 atm to 9.98 GPa), showing a pressure‐triggered aggregation‐induced emission in the range 1.0 atm–0.65 GPa. The photoactivated CDs with piezochromic fluorescence enhancement broadens the versatility of CDs from ambient to high‐pressure conditions and enhances their anti‐photobleaching.

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Section: Figurementioning

confidence: 63%

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

Jiang

Ding

et al. 2019

Angewandte Chemie

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“…X-ray photoelectron spectroscopy (XPS) spectra show the presence of C—C/C=C (284.6 eV), C—N (286.0 eV), and N—H (401.1 eV) 35 bonds that may mainly correspond to the template NMD, and the additional C—N=C bonds (399.0 eV) should be related to CDs in these two composites (Figure 2e–h). UV–vis absorption and Fourier transform infrared (FTIR) spectra of the mother solutions of two composites are also similar, in which the π–π* transitions of C=C bonds (280 nm) of CDs can be obviously identified in UV–vis absorption spectra, 36−38 as well as C—N and N—H bonds which can be identified in FTIR spectra (Figure S6). 39−41 With the similar structure and PL properties of CDs in the mother solutions taken into account, it is presumed that the CDs embedded in both zeolite matrices are similar.…”

Section: Resultsmentioning

confidence: 84%

Red Room-Temperature Phosphorescence of CDs@Zeolite Composites Triggered by Heteroatoms in Zeolite Frameworks

et al. 2019

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Carbon dots (CDs) with red-emitting room-temperature phosphorescence (RTP) are rarely reported because of the increasing nonradiative decay of the excited states and the decreasing energy gap between the excited states and ground states. Herein, we demonstrate a facile strategy for modulating the RTP properties of CDs in terms of donor–acceptor energy transfer (EnT) in the CDs-in-zeolite system. Upon tuning of the heteroatoms (Zn 2+ , Mn 2+ ) doped in the aluminophosphate zeolite frameworks, CDs@zeolite composites with green and red phosphorescence have been prepared via in situ hydrothermal synthesis. In such composites, the zeolite matrix provides an efficient confinement role in stabilizing the triplet states of CDs. Significantly, the Mn-doped zeolite could act as an energy acceptor allowing EnT from excitons of CDs to the dopant in the host matrix, generating the intriguing red RTP behavior. This work provides an effective strategy for developing CD-based composite materials with special RTP emissions as well as new fields for applications.

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“…2d), and C 1s (Fig. 2e), respectively [32]. These results indicate that the NBDs mainly contain C (64.33%), O (32.34%), and N (2.72%), as well as limited amount of P, and the P element may come from the phospholipid of the soybeans [33].…”

Section: Resultsmentioning

confidence: 99%

Fluorescent Nano-Biomass Dots: Ultrasonic-Assisted Extraction and Their Application as Nanoprobe for Fe3+ detection

et al. 2019

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Biomass as sustainable and renewable resource has been one of the important energy sources for human life. Herein, luminescent nano-biomass dots (NBDs) have been extracted from soybean through ultrasonic method, which endows biomass with fluorescence property. The as-prepared NBDs are amorphous in structure with an average diameter of 2.4 nm and show bright blue fluorescence with a quantum yield of 16.7%. Benefiting from the edible raw materials and heating-free synthesis process, the cytotoxicity test shows that the cell viability still keeps 100% even if the concentration of the NBDs reaches 800 μg/ml, indicating the good biocompatibility of the NBDs. In addition, the fluorescence of the NBDs is very sensitive to Fe 3+ , which can be used for Fe 3+ detection in terms of their health superiority. The limit of detection (LOD) of the proposed sensor was determined as 2.9 μM, which is lower than the maximum allowable level of Fe 3+ (5.37 μM) in drinking water. Electronic supplementary material The online version of this article (10.1186/s11671-019-2950-x) contains supplementary material, which is available to authorized users.

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Mechanofluorochromic Carbon Nanodots: Controllable Pressure‐Triggered Blue‐ and Red‐Shifted Photoluminescence

Cited by 101 publications

References 49 publications

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

Photoactivated Fluorescence Enhancement in F,N‐Doped Carbon Dots with Piezochromic Behavior

Red Room-Temperature Phosphorescence of CDs@Zeolite Composites Triggered by Heteroatoms in Zeolite Frameworks

Fluorescent Nano-Biomass Dots: Ultrasonic-Assisted Extraction and Their Application as Nanoprobe for Fe3+ detection

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