CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Dong Gao,Yusheng Zhang,Amin Liu,Yuda Zhu,Suping Chen,Dan Wei,Jing Sun,Zhenzhen Guo,Hongsong Fan
Multiple-color-emissive carbon dots (CDs) is one of the hotspots due to its potential in multi-fields. However, the exploring of efficient synthetic strategies and emission mechanisms still remain challenging. Herein, we report a facile solvothermal route to prepare CDs with tunable photoluminescence (PL) from green to red via a novel PL-tuning strategy of sulfur doping and water engineering. By detailed characterizations and comparison, it is demonstrated that the S doping can significantly increase the content of graphitic nitrogen, resulting in the fluorescence shifting from green to yellow; on the other hand, water engineering is able to yield carboxyl group and enhance surface oxidation degree, which can further facilitate the PL shifting from yellow to red. Owning to multicolor emissions and S doping, the prepared PL-tunable CDs present versatility in various applications including fluorescent films, light-emitting diodes (LED), bioimaging probe and highly sensitive Fe 3+ detector.
研究领域:
材料科学
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生物医学工程
·
光学
✓ 已验证
DOI
高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2024
·
IF 3.9
Lihan Deng,Jin Li,Jiachen Chen,Jin He
Nanoporous Al 2 O 3 -SiO 2 glasses were prepared using a sol–gel method. These sintered nanoporous Al 2 O 3 -SiO 2 glasses have a transmittance greater than 85 % and possess high mechanical strength, enabling them to contain and protect RE ions. Owing to the presence of nanopores in nanoporous Al 2 O 3 -SiO 2 glasses, Eu ions can easily enter the nanoporous Al 2 O 3 -SiO 2 glasses via an ex-situ dipping method. After drying at room temperature (RT) and then heating at 400 °C, 600 °C, 800 °C, and 1200 °C, we obtained a series of Eu doped nanoporous Al 2 O 3 -SiO 2 glasses. The thermal reduction process from Eu 3+ ions to Eu 2+ ions can occur at a lower sintering temperature (400 °C), enabling a detailed analysis of the thermal reduction mechanism at both low and high temperatures in detail. Under the conditions where Al 3+ ions are present in the samples that are under calcination, Eu 2+ -doped nanoporous Al 2 O 3 -SiO 2 glasses are more easily obtained at relatively low temperatures. Owing to the adjustable composition of Eu 3+ /Eu 2+ in the nanoporous Al 2 O 3 -SiO 2 glasses, tunable emission from red-orange light to blue-violet light can be achieved in the samples. This new type of transparent Eu-doped NPGs has the advantages of high mechanical strength and good processability and is non-toxic and harmless, thereby showing great potential for use in tunable light sources and LED devices.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Qianmin Ma,Meng Zhang,Chi Yao,Yaping Du,Dayong Yang
Lanthanide (Ln)-based supramolecular hydrogels are a new category of smart optical materials, which are promising for applications in chemistry sensors, bioimaging agents and light-emitting devices. Herein, we report a supramolecular hydrogel with tunable and responsive luminescence, which is based on the assembly of Ln and deoxyguanosine (dG, one of the units of DNA). ESI-TOF-MS, NMR, FTIR, PXRD and simulation results verify the formation of dG/Ln hydrogels. dG/Tb hydrogel emits strong green luminescence, while dG/Eu hydrogel is nonluminous; when Tb is co-doped into dG/Eu, surprisingly we find that co-doped dG/Tb/Eu hydrogel displays tunable luminescence from green, orange to red by simply regulating the stoichiometric ratio of Tb and Eu. A cascade luminescence resonance energy transfer mechanism (from dG to Tb, and to Eu) is proposed in this co-doped system, which is confirmed by luminescence decay curves and emission spectra. Subsequently, luminescence switch is designed based on reversible responsiveness of hydrogel upon Ag + /L-Cys, temperature and pH stimuli via dynamic supramolecular coordination. Our work provides a new route to construct multicolor functional materials.
研究领域:
材料科学
·
生物医学工程
·
化学
✓ 已验证
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2024
·
IF 4.3
Chen Ruan,Siqi Zhou,Xinru Wu,Lina Zou,Rong Wang,Gaiping Li
Some metal ions, with inner enzyme-like catalytic activity, could be doped into lanthanide coordination polymers (Ln CPs) through coordination, which has been proved as a facile strategy to prepare the luminescent nanozymes. In this study, Cu-doped Ln CPs with laccase-mimic activity and double luminescence were rationally designed and synthesized by self-assembly of guanine monophosphate (GMP), 2-aminoterephthalic acid (ATA), Cu 2+ and Tb 3+ in buffer solution at room temperature. The obtained probes Tb/Cu-GMP/ATA CPs not only emitted green fluorescence of Tb 3+ and blue fluorescence of ATA simultaneously under irradiation at the same wavelength, but also processed enhanced laccase-like activity for catalyzing the oxidation of phenolic substrates. Upon dopamine (DA), the probes catalyzed the oxidation of DA to polydopamine (PDA), which effectively quenched the fluorescence of Tb 3+ due to the internal filtration effect. Based on this, a ratiometric fluorescent sensor for DA was constructed accordingly, and the corresponding fluorescence intensity ratio of Tb 3+ to ATA (F 547 /F 427 ) was linearly correlated with the DA concentration in the range of 1 to 400 μM, with a detection limit of 0.44 μM. Besides, this sensor could be used to detect DA in human serum samples with good recovery, which results were highly consistent with that of HPLC method. The constituent and luminescence tunability, as well as the extraordinarily facile synthesis, made Ln CPs a potential platform for designing and preparing the integrated multifunctional probe for special target in sensing applications.
研究领域:
材料科学
·
分析化学
·
生物化学
✓ 已验证
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）