Small
·
2023
·Vol. 19
·期 33
·2301010
·
IF 13.3
Jie Chen,Yiwen Zeng,Ruifen Sun,Weiwei Zhang,Yun Huang,Jingcheng Zheng,Yuwu Chi
The intrinsic instability of halide perovskites toward to external stimulus, has created a competitive advantage for designing stimuli-responsive materials. However, the external environment tuning reversibly fluorescence emission of perovskite system is still limited. In this work, humidity is verified to act as a new option to modulate the emission properties of mixed-halide perovskite. The perovskite nanocrystals (PNCs) photoirradiated in dichloromethane are easily and stably redispersed in water, and emit bright fluorescence which is quite different from the original. Moreover, the perovskites confined on glass slide can reversibly switch their fluorescence between blue and green colors under moisture. It is demonstrated that the factors of different solubilities of CsCl and CsBr in water, the structural transformation of perovskites and the confine of glass matrix play key roles in the reversible transformation. Finally, the combination of hydrochromic CsPb(Br x Cl y ) 3 and water-resistant CsPb(Br x Cl y ) 3 -polymethyl methacrylate have been applied in advanced anti-counterfeiting, which greatly improves the information security. This work not only give an insight into the effects of humidity on fluorescence and structures of PNCs, but also offer a new class of hydrochromic PNCs materials based on reversible emission transformation for potential application in sensors, anti-counterfeiting and information encryption.
研究领域:
材料科学
·
光学
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产品关联
DOI
PubMed
高影响因子
Soft Matter
·
2022
·Vol. 18
·期 41
·8017-8023
·
IF 4.046
Shilin Yang,Bo Liao,Enxiang Liang,Shoujun Yi,Qing Liao
A novel type of aggregation-induced emission (AIE) nanoparticles, which are carbon dots (CDs) grafted with block polymer of tetraphenylethylene, spiropyran and N-isopropylacrylamide (CD-g-poly((TPE-co-SPA)-block-NIPAM)), was synthesized. The CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles can emit weak cyan fluorescence in tetrahydrofuran, while showing AIE-enhanced cyan fluorescence in water and solid film. The fluorescence of the CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles can reversibly transform cyan to red with UV/visible light irradiation, and functioned as a reversible fluorescence photoswitch. Importantly, the CD-g-poly((TPE-co-SPA)-block-NIPAM) nanoparticles have low cytotoxicity and, therefore, can be used for imaging in living cells.
研究领域:
材料科学
·
生物医学工程
·
光学成像
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qiurui Zhang,Juqing Li,Zhichao Yu,Pei Xiang,Longya Xiao,Jincheng Lei
The development of patterned metal halide perovskite quantum dots (MHP QDs) has become an important strategy to explore new functionalities and applications in optoelectronics. Herein, a laser-induced technology is developed to fabricate multicolor MHP QD patterns to achieve multiple information encryption modes. To precisely control the synthesis reactions, PbBr2 and CsBr, the precursors of CsPbBr3 QDs, are separately coated on the donor glass and target substrates and stacked into a donor-PbBr2–CsBr-target structure. A femtosecond laser is focused at the interface of PbBr2 and CsBr to induce localized ionic transportation and reaction so that CsPbBr3 QDs are precisely synthesized at the laser spot. By applying the environmental lability and low formation energy of perovskites, the PL emission of the laser-synthesized CsPbBr3 QDs can be reversibly eliminated under a moisture environment and recovered in situ by laser scanning for many cycles. This reversible PL behavior is attributed to the phase transformation between CsPbBr3 and CsPb2Br5 induced by the repeated laser irradiation and moisture treatment and is promising for applications in information encryption, anticounterfeit, and optical data storage. Furthermore, MHP patterns with multiple color emissions are synthesized by adjusting the precursors, demonstrating the flexibility of the developed technology in color tuning of MHP QDs.
研究领域:
材料科学
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光学工程
·
信息加密技术
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产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Nanjun Chen,Zichen Ning,Zhuoshan Gong,Limin Zhou,Li Xu,Feiqiang He,Zhi Gao,Jerry Y. Y. Heng,Shichao Du,Jinbo Ouyang
Modulating the luminescent characteristics of solid materials via the multicomponent crystallization process to form cocrystals and hydrates poses a formidable and significant challenge. In this study, we demonstrated the aggregation-induced emission characteristics of piroxicam and synthesized four distinct cocrystals using salicylic acid, m-chlorobenzoic acid, saccharin, and 1-hydroxy-2-naphthalenecarboxylic acid as coformers. We comprehensively characterized the crystal structures and luminescent properties of these cocrystals using powder X-ray diffractometer, fluorescence microscopy, and fluorescence spectrophotometry. Moreover, the relationship between the crystal structure and fluorescence properties was established through theoretical analyses, including the calculation of intermolecular interactions, the distribution of frontier orbitals obtained based on density functional theory, and the electron density distribution derived from molecular electrostatic potential calculations. Additionally, we synthesized a novel piroxicam hydrate that exhibits a reversible fluorescence switching effect in response to acidic, basic, and thermal stimuli upon absorbing, eliminating, or replacing water molecules within the lattice, which renders it suitable for application in thermal and pH sensors, as well as information encryption. Overall, this approach offers a promising framework for precisely tuning the fluorescent properties of AIE molecules through the hydration and dehydration processes of organic crystals.
研究领域:
材料科学
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化学
·
光学
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2018
·
IF 0
Quan Xu,Rigu Su,Yusheng Chen,Sreeprasad Theruvakkattil Sreenivasan,Neng Li,Xusheng Zheng,Junfa Zhu,Haibin Pan,Weijun Li,Chunming Xu,Zhenhai Xia,Liming Dai
As a class of the heteroatom-doped carbon materials, metal charge-transfer doped carbon dots (CDs) exhibited an excellent optical performance and were widely used as fluorescent probes. To improve fluorescence quantum yield (QY) remains one of the fundamental and challenging issues in the carbon dots field. Herein, we prepared a novel manganese doped CDs (Mn-CDs), which exhibited an ultrahigh quantum yield of 54%, the highest quantum yield for metal-doped CDs. Various spectroscopic measurements revealed an in situ change of dopant oxidation state during the synthesis. Our further study indicated the presence of metal–carbonate, which served as an important component for high quantum yield. We have also studied the reversibly switchable fluorescence property of Mn-CDs by adding Hg2+/S2–, as well as elucidating the underlying mechanism of this switching fluorescence phenomenon. By using the Mn-CDs as fluorescent probes, we developed an extremely sensitive detection method for heavy metal Hg2+ detection at a nM detection limit level.
研究领域:
材料科学
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分析化学
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环境科学
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产品关联
DOI
BIOMACROMOLECULES
·
2021
·
IF 6.988
Lili Cai,Huatang Zhang,Jianwei Guo,Sa Liu,Yong-Guang Jia
Tuning the fluorescence of aggregation-induced emission (AIE)-based materials in a reversible way is essential and a requisite for their applications. The multiple host–guest interactions of polypseudorotaxanes (PPRs) could alter the aggregation state of hydrophobic AIE-based polymeric materials and consequently switch the fluorescence. Herein, tetraphenylethylene (TPE) as a typical AIE molecule has been incorporated into the main chains of the guest polyurethane via a step condensation between poly(ethylene glycol) (PEG)-based dicarbonate and TPE-diamine along with the cleavable disulfide bonds. γ-Cyclodextrins (γ-CDs) can selectively recognize the TPE units at the polyurethane chains to afford a PPR. Hydrophilic PEG segments and γ-CD molecules in the PPR could promote the disaggregation of TPE units, suppressing the fluorescence emission of TPE. To restore the aggregated state and fluorescence of TPE units, tris(2-carboxyethyl)phosphine (TCEP) and α-amylase are sequentially introduced to cleave the disulfide bonds and cut α-1,4 glycosidic bonds of γ-CD, reactivating the AIE behavior of PPR tandemly and accomplishing the reversible cycle of tuning the fluorescence of TPE. The present study provides a tandem way to switch the AIE behavior of polymeric materials reversibly.
研究领域:
材料科学
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化学
·
聚合物科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Min Gao,Jingfang Li,Ning Peng,Lijun Jiang,Sicong Zhao,Ding-Yi Fu,Guangming Li
The development of information storage materials and techniques with enhanced security level is still great challenging. Herein, the luminescent hydrogels were facilely prepared by doping luminescent lanthanide complexes into non-covalent cross-linked gelatin/poly(vinyl alcohol) hydrogels. The acquired luminescent hydrogels exhibited reversible luminescent switching behavior upon HCl/NH 3 and Fe 3+ /EDTA 2− stimuli, respectively. Remarkably, such reversible luminescent switching property of the hydrogels allows themselves as good candidates for rewritable information security storage. The written patterns were invisible under daylight, however can be clearly observed under UV light, suggesting their potential applications in information protection. Moreover, luminescent hydrogels with low toxicity possessed appealing shape memory and self-healing properties simultaneously. The combination of shape memory and self-healing properties with reversible luminescent switching property can access advanced information encryption effectively. Such encrypted information can only be decrypted by specific predesigned procedures with multi-steps. This work provides an alternative strategy to design and fabricate smart optical soft materials for advanced information encryption.
研究领域:
材料科学
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光学
·
生物医学工程
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 27
·11983-11991
·
IF 3.591
Wen Lu,Jiuzhou Shi,Jichao Chen,Lu Sun,Lingcen Shao,Hongyu Ren,Mengmeng Huang,Yanqin Wang,Shilong Yang,Xu Li
This study describes the synthesis of a coumarin-based reversible fluorescent probe BuCAC for the detection of Cu2+ and S2− in CH3CN : PBS (v/v = 8 : 2, pH = 7.4) solution. The resulting BuCAC exhibited high sensitivity (detection limit = 3.03 × 10−7 M) and selectivity towards Cu2+ through a 2 : 1 binding mode. In the presence of S2−, the BuCAC–Cu2+ recovered to BuCAC and CuS, which in turn perform the function of a sensitive probe with a lower detection limit of about 1.7 × 10−7 M. This “on–off–on” process can easily occur in 1 min with a repetition of at least 5 times. The sensing mechanism was confirmed by Job's plot analysis, MS, and density theory calculation. Besides, fluorescence imaging in zebrafish, HeLa cells, and soybean root tissue revealed that the probe BuCAC could serve as a valuable tool for monitoring and tracking intracellular Cu2+ and S2− while benefiting from its excellent fluorescence performance and lower cytotoxicity.
研究领域:
分析化学
·
生物化学
·
生物医学工程
·
细胞生物学
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Yu Zhong,Zhiqi Wang,Lingqi Quan,Yiqiang Wu,Dongying Hu,Jun Cheng,Yanjie Zheng,Fangchao Cheng
The rapid development of anti-counterfeiting technology has brought new challenges to the repeatability and stability of reversible fluorescence/photochromic switching hydrogels. To address this issue, a series of chemical cross-linked cellulose-based intelligent responsive hydrogels were synthesized by free-radical graft copolymerization in a hydrothermal process. This strategy allows for the creation of a chemical cross-linked three-dimensional structure that anchors photochromic ammonium molybdate and fluorescent carbon dots together, resulting in enhanced stability and mechanical properties. Especially, the tensile and compressive strength of hydrogel reached a maximum value of 280 kPa and 560 kPa, respectively, which far exceeds that of some reported hydrogels. The resultant hydrogels exhibited desired reversible fluorescence/photochromic switching, reversible printing and erasing of patterns, and information encryption/decryption. Notably, the change of photochromism from yellow to green can be realized, and the self-fading process can be shortened to 25 min at 60 °C instead of 6 h at room temperature. More importantly, the fluorescence quenching phenomenon of the hydrogel occurs gradually after 2 min of continuous irradiation, and it can be recovered by selective treatment with ethanol. Overall, this study provides a simple strategy for the preparation of environmentally friendly reversible fluorescence/photochromic switching cellulose-based hydrogels for information encryption.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 18
·10979-10989
·
IF 4.22
Wang Jing,Wang Tao,Hu Yimeng,Zhang Xiaonan,Ma Yanyan,Lv Hongmin,Xu Shanshan,Wang Yinglong,Jiang Zike
In this work, novel β -cyclodextrin-enhanced Eu 3+ luminescence aggregates (CELAs) with bright red fluorescence of Eu 3+ are prepared. These CELAs exhibit the quick response and highly selective sensitivity at the concentration of 50 µM Fe 3+ . A series of ligands (such as TTA, phen, β -cyclodextrin) sensitizes the luminescence of Eu 3+ (the “antenna effect”), and metal ions–ligands interactions can differentially alter the antenna effect of ligands toward Eu 3+ . Addition of EDTA to chelate Fe 3+ restores the fluorescence, indicating that the fluorescence quenching in the presence of Fe 3+ is reversible. This research provides that CELAs integrate these merits of superior lanthanide fluorescence and the amphiphilia property of β -cyclodextrin ( β -CD). It is a unique system with enhancement Eu 3+ luminescence in ethanol–water system and will be applied for aqueous solution detection sensor with high selectivity and reversibility for Fe 3+ . On the other hand, the on-off fluorescence property of the CELAs is convenient for environmental detection system.
研究领域:
材料科学
·
分析化学
·
传感器
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）