Luminescent bioplastic nanocomposite based on N, K, Ca-doped carbon quantum dots derived from ice plant flower extract for applications in quantum dot-based optical displays

IF 5.5 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Carbon Letters Pub Date : 2025-01-21 DOI:10.1007/s42823-024-00845-8

Varnika Singh, Gajal Singla, Vishal Kansay, Varun Dutt Sharma, Anita Bhatia, Nikhil Kumar, M. K. Bera

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引用次数: 0

Abstract

Quantum dot nanocomposite-based luminescent materials have gained attention for solid-state lighting and optical displays. This study presents a one-step, eco-friendly hydrothermal process to synthesize nitrogen, potassium, and calcium-doped carbon quantum dots (N, K, Ca-doped CQDs) from the flower extract of Mesembryanthemum crystallinum L. (ice plant). The CQDs were characterized using HRTEM, EDX, SAED, XPS, XRD, NMR, FTIR, zeta potential, UV–Vis, and photoluminescence spectroscopy. HRTEM revealed an average particle size of 4.6 nm, with a range of 2 to 7 nm. The CQDs exhibited a quantum yield of 20%, excellent water solubility, photostability, and greenish fluorescence under UV (365 nm). The fluorescence spectra were analyzed using CIE (Commission Internationale de l’Eclairage) chromaticity coordinates to determine the emitted color. The fluorescence emission behavior was influenced by solvent polarity, locally excited (LE) states, intramolecular charge transfer (ICT) processes, and hydrogen bonding. The hydrogen bonds between N, K, Ca-doped CQDs and DI water likely enhanced the stability of the ICT state, resulting in a red shift in fluorescence. Additionally, we developed an eco-friendly wheat-starch-based bioplastic nanocomposite by embedding the CQDs. The effects of CQD concentration and pH sensitivity on luminescent properties were explored. Finally, we demonstrated a practical application by designing a conceptual nameplate-like calligraphy using the optimized CQDs@bioplastic nanocomposite film (CQD concentration: 240 mg/mL, pH: 2.7), highlighting its potential for luminescent film applications.

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基于冰植物花提取物中N， K， ca掺杂碳量子点的发光生物塑料纳米复合材料在量子点光学显示中的应用

基于量子点纳米复合材料的发光材料在固态照明和光学显示领域得到了广泛的关注。本研究以冰植物Mesembryanthemum crystinum L. （Mesembryanthemum crystinum L.）花提取物为原料，采用一步、环保的水热法合成氮、钾、钙掺杂碳量子点（N， K， ca掺杂CQDs）。采用HRTEM、EDX、SAED、XPS、XRD、NMR、FTIR、zeta电位、UV-Vis和光致发光光谱对CQDs进行了表征。HRTEM显示平均粒径为4.6 nm，范围为2 ~ 7 nm。CQDs的量子产率为20%，具有良好的水溶性、光稳定性和365 nm紫外光下的绿色荧光。荧光光谱分析采用CIE （Commission Internationale de l’eclairage）色度坐标确定发射颜色。荧光发射行为受溶剂极性、局部激发态（LE）、分子内电荷转移（ICT）过程和氢键的影响。N， K， ca掺杂CQDs和DI水之间的氢键可能增强了ICT态的稳定性，导致荧光红移。此外，我们通过嵌入CQDs开发了一种环保的小麦淀粉基生物塑料纳米复合材料。探讨了CQD浓度和pH敏感性对发光性能的影响。最后，我们利用优化后的CQDs@bioplastic纳米复合膜（CQD浓度：240 mg/mL， pH: 2.7）设计了一个概念性的铭牌式书法，展示了其在发光膜中的应用潜力。

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来源期刊

Carbon Letters CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

7.30

自引率

20.00%

发文量

118

期刊介绍： Carbon Letters aims to be a comprehensive journal with complete coverage of carbon materials and carbon-rich molecules. These materials range from, but are not limited to, diamond and graphite through chars, semicokes, mesophase substances, carbon fibers, carbon nanotubes, graphenes, carbon blacks, activated carbons, pyrolytic carbons, glass-like carbons, etc. Papers on the secondary production of new carbon and composite materials from the above mentioned various carbons are within the scope of the journal. Papers on organic substances, including coals, will be considered only if the research has close relation to the resulting carbon materials. Carbon Letters also seeks to keep abreast of new developments in their specialist fields and to unite in finding alternative energy solutions to current issues such as the greenhouse effect and the depletion of the ozone layer. The renewable energy basics, energy storage and conversion, solar energy, wind energy, water energy, nuclear energy, biomass energy, hydrogen production technology, and other clean energy technologies are also within the scope of the journal. Carbon Letters invites original reports of fundamental research in all branches of the theory and practice of carbon science and technology.