SENSORS AND ACTUATORS B-CHEMICAL
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2024
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IF 8
Xinyi Li,Wanqing Liang,Yawen Gao,Yongqin Shi,Cheng Zhang,Kui Zhang
Glutathione (GSH) has important physiological functions and has been implicated in several diseases. It is therefore of great physiological importance and clinical value to develop simple and efficient methods for measuring GSH levels. However, common used luminescent materials with short lifetimes inevitably generated background signal from the biological samples during light excitation. In this work, a GSH sensing method with ultralow background interference was developed using phosphorescent carbon dots (CDs). Introducing heteroatom and carbonyl group effectively activated the triplet state of phosphorescent CDs. Meanwhile, immobilization of CDs in SiO 2 (CDs@SiO 2 ) realized long-lived phosphorescent emission (lifetime of 1.54 s) in aqueous dispersion. Manganese dioxide (MnO 2 ) quenched the phosphorescence of CDs@SiO 2 via inner filter effect and triplet energy transfer, yet the phosphorescence was restored when GSH was present. The phosphorescence was recorded when the excitation source was turned off, which successfully eliminated the background fluorescence of biological samples. The work presented here will promote the fabrication of bioprobes with low background.
研究领域:
分析化学
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生物医学
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Zhanpeng Liu,Xiangbo Ding,Lin Cai,Yihan Jia,Xia Ran,Zhongzheng Guo,Dan Mo,Yatao Pan,Lijun Guo
Room-temperature phosphorescence (RTP) carbon dots (CDs) have attracted extensive attention due to their afterglow properties and promising potential in optical information and encryption fields. However, achieving tunable and broadband RTP CDs-based afterglow materials remains a great challenge for practical applications. Herein, we constructed broadly tunable afterglow CDs-based hybrid systems by employing cascade Förster resonance energy transfer (FRET) for fingerprint recognition and anticounterfeiting. The as-prepared CDs composites exhibit excellent green RTP properties with a quantum yield of 21.7 % and a lifetime of 1.05 s. Combination of the RTP CDs as the energy donor and Sulforhodamine 101 (SR101), Rhodamine B or Rhodamine 6G as the acceptor in polyvinyl alcohol (PVA) film, the afterglow spectrum of RTP CDs/dye/PVA film is markedly extended to the red region through an efficient triplet-singlet FRET. The sequential incorporation of SR101 and Oxazine 170 with RTP CDs further broadens the afterglow spectrum of CDs/SR101/Oxazine170/PVA film covering from green to near-infrared regions due to the cascade relayed FRET. The flexible FRET configuration of highly emissive RTP CDs with various dye acceptors endows the CDs/dyes/PVA hybrid films with tunable color and broadband afterglow properties for fingerprint recognition and anticounterfeiting applications.
研究领域:
材料科学
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光学
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信息加密
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2023
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IF 7.4
Yu Zheng,Xinyi Li,Caixia Wei,Yawen Gao,Guangmei Han,Jun Zhao,Cheng Zhang,Kui Zhang,Zhongping Zhang
Free radicals and their induced oxidative damage in living organisms are related to many diseases. Natural substances with antioxidant capacity are effective in scavenging free radicals, which could slow down aging and prevent diseases. However, the existing methods for the evaluation of antioxidant activity mostly required the use of complex instruments and operations. In this work, we proposed a unique method to determine the total antioxidant capacity (TAC) in real samples through a photosensitization-mediated oxidation system. N- and P-doped long-lived phosphorescent carbon dots (NPCDs) were developed, which exhibited the effective intersystem crossing from the singlet to the triplet state under UV light irradiation. Mechanism study confirmed that the energy of excited triplet state in NPCDs generated superoxide radicals and singlet oxygen through type I and type II photoreactions, respectively. On this basis, the quantitative determination of TAC in fresh fruits was achieved using 3,3′,5,5′-tetramethylbenzidine (TMB) as a chromogenic bridge in the photosensitization-mediated oxidation system. This demonstration will not only provide a facile way to analyze antioxidant capacity in practical samples but also broaden the applications of phosphorescent carbon dots.
研究领域:
生物化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
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2023
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IF 7.4
Taotao Li,Xinyi Li,Yu Zheng,Pan Zhu,Cheng Zhang,Kui Zhang,Jing-Juan Xu
Employing long-lived luminescent materials to design a chemical sensing platform can eliminate real-time excitation and background fluorescence. However, the realization of long-lived emissions in aqueous media was limited to transition-metal complexes, doped quantum dots, organic crystals, and inorganic persistent phosphors, which suffer from the drawbacks of large size, expensive elements, and poor dispersibility. In this work, phosphorescent carbon dots (CDs) were covalently immobilized in a silica matrix (CDs@SiO2) to achieve afterglow emission in an aqueous dispersion. CDs@SiO2 with long lifetime (∼1.6 s) was utilized as an energy donor to fabricate nonradiative energy transfer systems with various organic dyes through the surface micelle self-assembly method. Benefiting from the high energy transfer efficiency between CDs@SiO2 and organic dyes, multicolor afterglow emissions were successfully obtained in aqueous media. As a proof of concept, a ratiometric phosphorescent probe using CDs@SiO2 as a donor and Hg2+-responsive rhodamine derivative as an acceptor was designed. Hg2+ triggered the energy transfer process between the donor–acceptor pair, leading to the sensitive detection of Hg2+ ions. The work presented here provides opportunities to develop chemical sensors with low background interferences and easily recognizable signals.
研究领域:
分析化学
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材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
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2025
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IF 7.2
Yueyue Wu,Zifan Li,Zhe Zhou,Zicheng Zhang,Duoyi Zhu,Xuemei Dong,Fei Xiu,Wei Huang,Juqing Liu
Developing matrix-free phosphorescent carbon dots (CDs) with tunable color emission and exceptionally long lifetimes is highly desirable for sophisticated information encryption. However, the majority of reported matrix-free CDs demonstrate only single-color emission and short lifetimes, restricting their practical applications. Herein, dual-emission self-protective room temperature phosphorescent CDs (DE-CDs) with ultra-long lifetimes and time-dependent afterglow colors are prepared. These DE-CDs are synthesized through a microwave heating process involving 1-butylamine and phosphoric acid aqueous solution. By adjusting excitation wavelength, they display green and yellow phosphorescence with ultra-long lifetimes of up to 1.25 and 1.74 s, respectively, representing the longest lifetime among matrix-free green and yellow CDs to date. The dual emission is attributed to the coexistence of a high-energy state within the carbon core and a low-energy state associated with C─N/C═N bonds on DE-CDs surface. The ultra-long lifetimes originate from the self-protective internal hydrogen bonds formed between P and N heteroatom-containing functional groups on the dot surface, which stabilize the emissive species. Intriguingly, under 365 nm irradiation, the afterglow color transitions from yellow to green due to differing triplet-state decay rates. Leveraging these time-dependent afterglow colors, a triple-code mode is achieved for advanced dynamic encryption.
研究领域:
材料科学
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光学
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信息加密技术
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2022
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IF 4.171
Xin Bao,Enshan Liu,Xi Yuan,Hui Wang,Haibo Li,Songnan Qu
The development of anti-water phosphorescent carbon dots (CDs) based materials is of great practical interest. Herein, we report a rational design of CDs based composite with anti-water phosphorescence by controlling a one-step microwave assisted heating of green fluorescent CDs and urea. Upon increasing the microwave-heating temperature, urea was gradually converted to C 3 N 4 , in which the CDs were uniformly embedded in the C 3 N 4 matrix. The fluorescence/phosphorescence intensity of these CDs based composites are determined by the morphologies of the C 3 N 4 , which can be adjusted by controlling the microwave heating time. More importantly, the combining CDs in C 3 N 4 not only promote the phosphorescence emission but also prevent the phosphorescence quenching by water, leading to stable phosphorescence emission in aqueous environment. Based on the anti-water phosphorescence properties of these CDs based composites, a concept of multiple data encryption was demonstrated.
研究领域:
材料科学
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化学
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光电
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数据安全
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2023
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IF 4.4
Feng Lu,Xinhuan Xu,Xingdong Zhu,Linxin Shen,Weizheng Wan,Min Hu
Room temperature phosphorescent (RTP) Carbon Dots have been capturing increasing attention in recent years, while building a general method to adjust the emission color of RTP carbon dots is still a big challenge. Herein we report a simple method that combine the carbon nanodots and dyes (R6G and DCF) in SiO 2 nanosphere to get a series of multicolor RTP nanodots (CD@SiO 2 @dye) with long lifetime in aqueous solution. Leverage on chitosan quaternary ammonium as matrix and diethylenetriamine as N-doping resource to form a cross-linked skeleton as a luminescent center (namely CD), and a rigid network is formed by silica encapsulation (CD@SiO 2 ) to restrict the non-radiative transition process to generate the phosphorescence. The CD-based composites, with 1.10 s green (503 nm) phosphorescence emission, serve as activator to stimulate the corresponding luminescence of organic dyes. Then, based on Förster resonance energy transfer (FRET) process from CDs (as donor) to organic dyes (as acceptor) under UV excitation, the CD@SiO 2 @R6G emit ultra-long lifetime (1.13 s) orange-yellow (570 nm) afterglow, and CD@SiO 2 @DCF emit ultra-long lifetime (1.20 s) yellow-green afterglow (530 nm). Furthermore, it also achieves RTP colors control when the ratio of CDs and the dyes changes, the ratio of green emission and dye’s emission activated by CDs will gradually change as well. These kinds of materials keep the inherent advantages of low toxicity and luminous stability, and achieve adjustable RTP color in aqueous solution. Our research provides a strategy to synthesize water-soluble long-life RTP CDs with adjustable color and lifetime.
研究领域:
材料科学
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纳米技术
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光化学
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分析化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）