Extremely low loading of carbon quantum dots for high energy density in polyetherimide nanocomposites

Xie, Haoran; Luo, Hang; Liu, Yuan; Ru, Guo; Ji, Xiaobo; Hou, Hongshuai

doi:10.1016/j.cej.2021.133601

Cited by 40 publications

(15 citation statements)

References 54 publications

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“…6 Compared with the traditional uorescent semiconductor quantum dots and organic dyes, CDs have unique physical and chemical properties, such as adjustable surface groups, excellent optical properties, better optical stability, good biocompatibility, water solubility, low toxicity, and environmental friendliness. [7][8][9][10][11][12][13][14][15][16][17] Due to their high quantum yield and adjustable uorescence characteristics, CDs have been widely used in photoelectric elds such as light-emitting diodes and luminescent solar concentrators. 18,19 However, these applications have not fully utilized the excellent physical and chemical properties of CDs, such as high electron transfer efficiency, wide light absorption range, and catalytic activity brought about by abundant surface-active sites.…”

Section: Introductionmentioning

confidence: 99%

Carbon dot/inorganic nanomaterial composites

Cai

et al. 2022

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Carbon dot/inorganic nanomaterial composites

Cai

et al. 2022

J. Mater. Chem. A

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“…(a) Dielectric constant, (b) dielectric loss, (c) imaginary part of electric modulus, (d) AC conductivity, and (e, f) Weibull characteristic breakdown strength of composite films with 0.00, 0.10, 0.15, 0.20, 0.25, 0.30, and 0.50 wt % oriented FG fillers. (g) Comparison of the E b enhancement of the investigated polymer nanocomposite systems with low filler contents. ,,,,− …”

Section: Resultsmentioning

confidence: 99%

Enhanced Breakdown Strength of Ferroelectric Polymer Films for Capacitive Energy Storage by Incorporating Oriented Fluorographene

Yang

Ren

et al. 2023

ACS Appl. Nano Mater.

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Ever-increasing electrification scenarios call for high energy density (U e) polymer nanodielectric films beyond the commercial benchmark biaxially oriented polypropylene. Ferroelectric polymers of intrinsic high dielectric constant εr, if integrated with improved breakdown strength (E b) and dielectric loss from nanofillers, would be a promising paradigm for high-U e polymer nanodielectrics. Yet, this expectation is still in its infancy because of the great challenge of increasing the E b and needs introduction of new approaches. Here, fluorographene (FG), as a young halogen derivative of graphene, is employed as an emerging nanofiller to develop high-E b polymer nanodielectrics. A dramatically enhanced E b, which is 39.4% higher than that of a neat polymer film from casting, is achieved in a composite film along with a reduced dielectric loss by incorporating only 0.2 wt % FG with in-plane orientation from electrospinning. The origin of such a high E b-reinforcing effect of FG is traced by both experimental characterizations and phase-field simulation. It is found that the in-plane oriented FG of appropriate loading level would induce both the favorable low crystallinity of the polymer matrix and the FG–polymer interface with deep traps and less defects. This, together with the high out-of-plane insulation of FG from a high fluorine/carbon ratio, regulates the charge behaviors and breakdown paths and thus significantly enhances the voltage endurance of composite films. The results demonstrate the remarkable E b-reinforcing effect of emerging FG fillers in polymer nanodielectrics and offer a strategy toward high-E b/high-U e flexible dielectric capacitors.

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“…The e r of the composite dielectric is around 3.2 for different temperatures and different components, which is consistent with previous studies. 41 At a temperature of 20 1C, the tan d of the composite dielectric is around 0.002. When the temperature rises, the loss angle tangent value of the composite dielectric is increased, in 0.004-0.008.…”

Section: Resultsmentioning

confidence: 99%