Multifunctional red-emission graphene quantum dots with tunable light emissions for trace water sensing, WLEDs and information encryption

Yang, Yongsheng; Tang, Siyuan; Chen, Da; Wang, Changxing; Gu, Bingli; Li, Xiameng; Xie, Feng; Wang, Gang; Guo, Qinglei

doi:10.1016/j.colsurfa.2021.126593

Cited by 22 publications

(10 citation statements)

References 60 publications

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“…The size of the PEI_GQDs is in the range of 4–11 nm (see the inset of Figure A), and the average diameter is about 7.3 nm. The HRTEM image of the PEI_GQDs (Figure B) shows a clear and regular lattice pattern with a fringe spacing of d = 0.246 nm, which is close to that reported in the literature, reflecting the lattice fringe (100) of graphene. , …”

Section: Resultssupporting

confidence: 86%

“…The HRTEM image of the PEI_GQDs (Figure 1B) shows a clear and regular lattice pattern with a fringe spacing of d = 0.246 nm, which is close to that reported in the literature, reflecting the lattice fringe (100) of graphene. 39,40 The crystal structures of GO and PEI_GQDs were characterized by XRD, as presented in Figure 2a,b, respectively. The two diffraction peaks of GO at 2θ = 12.50 and 42.70°correspond to the (002) and ( 101) crystal facets of graphite oxide.…”

Section: Synthesis Of Cus Nssmentioning

confidence: 99%

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Photoheating Effects of CuS@PEI_GQDs Nanoshells under Near-Infrared Laser and Sunlight Irradiation

Zhang

Yang

2023

Crystal Growth & Design

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CuS nanoparticles (CuS NPs) have excellent photothermal conversion effects due to their strong and wide-band light absorption. The composite of CuS NPs may enhance the light absorption and photoheating effect, and their broad applications have appealed to wide interests. In this paper, ethylene imine polymer (PEI)-linked graphene quantum dots (PEI_GQDs) were easily obtained by an ultrasonic-assisted hydrothermal approach, and CuS nanoshells (NSs) were prepared with Cu 2 O NSs as a template. The composite of CuS@PEI_GQDs NSs was easily obtained by selfassembly due to the electrostatic attraction between PEI_GQDs and CuS NSs. The morphology, structure, surface chemistry, and optical absorption of the prepared nanomaterials were characterized by multimicroscopic techniques. The results of high-resolution transmission electron microscope (HRTEM), X-ray diffractometer (XRD), Fourier transform infrared (FTIR), X-ray photoelectronic spectroscopy (XPS), and energy-dispersive spectrum (EDS) show that the PEI_GQDs were successfully linked on the surfaces of the CuS NSs; the FTIR analysis reveals that there is an interaction between CuS NSs and PEI_GQDs by chelation between Cu 2+ and −NH 2 in PEI_GQDs. The pore size distribution indicated that both the CuS NSs and CuS@PEI_GQDs NSs contained mesopores in the wall shells. The CuS@PEI_GQDs NSs displayed enhanced absorption within 190−500 and 630−1100 nm compared to the CuS NSs. The photoheating effects of CuS@PEI_GQDs NSs and CuS NSs were investigated under 808 nm laser and sunlight irradiation, and CuS@PEI_GQDs NSs presented a better photoheating effect and photothermal stability than CuS NSs. Our results provide a facile approach to fabricate other GQD-coated nanomaterials. The excellent photoheating effects of CuS@ PEI_GQDs NSs are promising in photothermal conversion.

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Section: Resultssupporting

confidence: 86%

Section: Synthesis Of Cus Nssmentioning

confidence: 99%

Photoheating Effects of CuS@PEI_GQDs Nanoshells under Near-Infrared Laser and Sunlight Irradiation

Zhang

Yang

2023

Crystal Growth & Design

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“…At present, anticounterfeiting is an important research direction of CDs fluorescence application, which has been widely reported. We compared the effect on solvent polarity and anti-counterfeiting of CDs recently reported (Table S1), [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42] and found that most CDs exhibited a red-shift in their fluorescence peaks with the increase of solvent polarity and a small Stokes shift below 110 nm. In our work, with the increase of solvent polarity, the fluorescence peak blue-shifts, and Stokes shift is as large as 260 nm.…”

Section: Chemistryselectmentioning

confidence: 99%

Environment‐Sensitive Carbon Dots Derived from Naphthalenediol for Solvent Polarity Indicator and Anti‐Counterfeiting

Zhang

2022

ChemistrySelect

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Herein, a novel type of environment-sensitive carbon dots (ES-CDs) has been synthesized via ethanothermal reaction using 1,6-naphthalenediol as a carbon source and sulfuric acid as a catalyst. The morphology and structure of ES-CDs are characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectra (XPS). ES-CDs exhibit green and excitation wavelength independent emission in different solvents. Using the optical response of ES-CDs towards acetone-water binary mixtures with different composition, the sensitive detection of solvent polarity is realized based on the inner filter effect (IFE). The inkjet printed patterns of ES-CDs show a blue-to-green conversion as exposure to external vapor from hydrogen chloride to ammonia, and enable information to hide assisting with a laser direct writing. We believe that the environment-sensitive carbon dots developed in this study are potential candidates for solvent sensing and fluorescence anti-counterfeiting.

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“…The edge N including pyrrolic N and pyridinic N in CDs can increase charge carrier density by attracting more charges from surrounding solvents. As the charge is excited from the ground state, it needs energy to change the dipole direction to be stabilized. , Because of the strong solvent dipole moment, the increasing polarity of the solvent consumes more energy to change the dipole direction of solvent molecules. , Thus, it leads to a red shift of the emission wavelength.…”

Section: Resultsmentioning

confidence: 99%

Reaction Time-Controlled Synthesis of Multicolor Carbon Dots for White Light-Emitting Diodes

Shen

Zheng

Lin

et al. 2023

ACS Appl. Nano Mater.

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Multicolor carbon dots (MCDs) have been receiving great attention because of their controllable fluorescence, which can be applied as novel optical sources. However, the preparation of MCDs is complex and the corresponding mechanism is still unclear. Here, using o-phenylenediamine and l-tryptophan as precursors, a facile one-step synthesis of MCDs (green, yellow, orange) is proposed through a reaction time engineering strategy. The structural and optical analyses combined with theoretical calculations are performed to disclose the synthetic and fluorescence mechanisms of MCDs. The result shows that increasing the reaction time improves the graphitization degree and surface states, making the emission wavelength red-shifted. In addition, the white-emissive CDs (w-CDs) are easily obtained using the same precursors. The structure and optical properties of w-CDs further confirm the importance of the graphitization degree and surface states in controlling the emissive color of CDs. Based on the optical properties, the MCDs are explored for water detection in organic solvents and multiple anticounterfeiting/information encryption. Moreover, multicolor light-emitting devices (LEDs) are successfully fabricated based on the MCD/PVP composition coated with 365 nm chips. In particular, high-performance white light-emitting devices (WLEDs) directly from w-CDs are obtained with Commission on Illumination (CIE) coordinates of (0.32 and 0.35) and a CRI of 87.2, similar to the standard w-LEDs.

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Multifunctional red-emission graphene quantum dots with tunable light emissions for trace water sensing, WLEDs and information encryption

Cited by 22 publications

References 60 publications

Photoheating Effects of CuS@PEI_GQDs Nanoshells under Near-Infrared Laser and Sunlight Irradiation

Photoheating Effects of CuS@PEI_GQDs Nanoshells under Near-Infrared Laser and Sunlight Irradiation

Environment‐Sensitive Carbon Dots Derived from Naphthalenediol for Solvent Polarity Indicator and Anti‐Counterfeiting

Reaction Time-Controlled Synthesis of Multicolor Carbon Dots for White Light-Emitting Diodes

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