JOURNAL OF POLYMER SCIENCE
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2024
·
IF 3.9
Weijie Zhang,Yuxiang Zhang,Jingjing Xiao,Xiaowei Wang,Lei Liu,Jibin Han,Hui Wang,Anchao Feng
Lead halide perovskite has currently emerged as a research hotspot in the field of photocatalysis due to its exceptional photovoltaic characteristics. Despite its potential, the susceptibility to degradation under harsh conditions such as light, humidity, and polar solvents poses a significant challenge. To counteract this, a strategy employing silica to shield the perovskite surface is conducted, thereby enhancing its stability. The resulting composite MAPbBr 3 @SiO 2 is then deployed as a photocatalyst in the photoinduced electron/energy transfer reversible addition fragmentation chain transfer (PET-RAFT) polymerization of butyl acrylate within polar solvents. The catalytic performance across different RAFT polymerization systems including varying the RAFT reagents, catalyst concentrations, and solvent types is meticulously examined. Remarkably, with a photocatalyst loading of merely 0.004 wt% and under a blue light intensity of 6 mW/cm 2 , over 80% monomer conversion can be achieved in 4 h. Moreover, the molecular weight distribution ( Đ ) consistently remains within the narrow range of 1.0–1.2 across all experimental setups, which proves the controllable nature of the PET-RAFT process. Owning the advantages of low photocatalyst requirement, compatibility with polar solvents, and narrow molecular weight distribution, PET-RAFT polymerization mediated by MAPbBr 3 @SiO 2 holds promise for scalable manufacturing and industrial-scale applications. Graphical Silica-coated hybrid lead halide perovskite nanocrystals are prepared and applied as photocatalysts in a PET-RAFT polymerization within polar solvents. High monomer conversion rates and polymers with narrow molecular weight distribution can be achieved. The polymerization process is notably efficient and can be conducted with minimal photocatalyst amounts, underscoring the superior efficiency and broad applicability of our novel photocatalyst system.
研究领域:
材料科学
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高分子化学
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光催化领域
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DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 9
·3189-3196
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IF 4.58
Wang Bei,Chen Miao-miao,Zhang Hai-qing,Wen Wei,Zhang Xiu-hua,Wang Sheng-fu
A fluorescence assay is described for the fluorometric determination of dopamine (DA). It based on the use of silica-coated CdTe quantum dots (QD@SiO 2 ). These were fabricated through a hydrothermal process. When DA is added to a solution of the QD@SiO 2 and then oxidized by oxygen under catalytic action of tyrosinase to form dopamine quinone, the fluorescence of QD@SiO 2 (acquired at excitation/emission wavelengths of 310/525 nm) decreases due to an electron transfer quenching processes. The assay has a linear calibration plot in the 0.05 to 30 μM DA concentration range and a 12.5 nM detection limit (at an S/N ratio of 3). The method was applied to the determination of DA in spiked human serum samples.
Schematic presentation of a fluorometric dopamine (DA) assay by using silica-coated CdTe QDs (QD@SiO 2 ). DA is oxidized by oxygen under catalytic action of tyrosinase to form dopamine quinone, and this causes the quenching of fluorescence of QD@SiO 2 at excitation/emission wavelengths of 310/525 nm.
研究领域:
分析化学
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生物医学工程
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DOI
高影响因子
PHYSICA B-CONDENSED MATTER
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2020
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IF 1.902
Bo Wang,Longjin Liu,Bin Liu,Jinkai Li,Bingqiang Cao,Zhenlu Zhao,Zongming Liu
The toxicity and stability of all-inorganic perovskite quantum dots are major challenge to be addressed in its commercialization process. Here, the toxicity of lead is reduced while improving the optical properties of quantum dots via replacing Pb 2+ ions in CsPbBr 3 perovskites quantum dots with low-toxicity and cost-effectiveness Cu 2+ cations. The PL emission and absorption peaks of quantum dots appear blue shift due to lattice shrinkage caused by copper ion doping. At the same time, we also observed that with the increase of Cu 2+ doping concentration, the fluorescence lifetime of quantum dots decreased from 40.66 ns to 8.23 ns. Next, the slim CsPbBr 3 :Cu@SiO 2 core-shell QDs were synthesized via a simply one-step synthesis method. Compared with the original CsPbBr 3 :Cu QDs, the stability of the quantum dots after coated has been significantly improved. Benefiting from this effective cladding strategy, these CsPbBr 3 :Cu@SiO 2 can be well used for manufacturing high-performance perovskite LEDs.
研究领域:
材料科学
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光学
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DOI
高影响因子
Nanoscale
·
2022
·Vol. 15
·期 2
·631-643
·
IF 8.307
Yanqiao Xu,Xiaobo Hu,Huidong Tang,Qing Hu,Sanhai Wang,Ting Chen,Xiaojun Zhang,Weihui Jiang,Lianjun Wang,Wan Jiang
Given the inherent characteristics of defect-tolerant, tunable emission performance, and high extinction coefficient, lead halide perovskite nanocrystals (NCs) have attracted widespread attention as a promising material in optoelectronic fields. However, their poor structural stability greatly impedes their practical applications. Herein, a novel strategy for synthesizing stable CsPbBr3@SiO2 NCs via the hydrolytic polycondensation of (3-aminopropyl)triethoxysilane (APTES) in the presence of ionic liquids (ILs) is deliberately designed. The problems of fluorescence quenching and undesirable agglomeration of NCs resulting from ligand loss and surface erosion existing in common encapsulation methods can be effectively resolved. The fast and controllable growth of the SiO2 shell around the CsPbBr3 NCs is realized owing to the high polarity and hygroscopicity of the IL. Moreover, the dual effects of the IL for passivating the surface defects and avoiding the structural degradation of NCs during the hydrolysis process of APTES are demonstrated. As a result, CsPbBr3@SiO2 NCs with a high photoluminescence quantum yield of 85.7% and excellent stability are realized. Furthermore, this method proves to be a versatile tool to obtain CsPbX3@SiO2 NCs with different halide compositions, realizing a broad tunable wavelength from 421.2 nm to 651.6 nm. A warm white LED with a high color rending index was assembled through packaging CsPbBr3@SiO2 NCs and Cu–In–Zn–S/ZnS/PVP composites on a commercial blue chip. These findings are expected to facilitate the development of perovskite NCs, which provides access to their optoelectronic applications.
研究领域:
材料科学
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光学工程
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DOI
PubMed
高影响因子
TALANTA
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2024
·
IF 5.6
Junhui Xiao,Wen Yao,Dongxu Yan,Jie Yang,Ziyin Qiu,Lishi Wang,Xinrong Guo
In this study, a core-shell structural nano-composite material, namely CdTeS@SiO 2 , is synthesized by a simple silanization of Te-doped CdS quantum dots (CdTeS QDs). Through SiO 2 capping, CdTeS QDs not only improve the fluorescence performance effectively, but also greatly enhance the anti-interference ability in the environment. Based on its excellent optical properties , a novel fluorescence sensor is constructed for the ultramicro detection of Ag + . The fluorescence of CdTeS@SiO 2 is strongly quenched in the presence of Ag + and shows good linearity in the range of 0.005–5.0 μmol L −1 with a detection limit as low as 1.6 nmol L −1 . This is mainly due to its unique quenching mechanism: Ag + destroys the spherical structure of SiO 2 and promotes the formation of non-radiative electron-hole pairs through electron transfer , leading to fluorescence quenching . At the same time, it competes with Cd for Te, S and MPA on the CdTeS surface, forming Ag–Te, Ag–S and Ag–MPA complexes attached to the CdTeS surface leading to wavelength red-shift. The feasibility of the proposed sensor is demonstrated through spiking experiments, which confirmed the potential value of the constructed fluorescence probe for real-world applications in detecting Ag + in environmental water.
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Jiandong Cui,Yuxiao Feng,Shiru Jia
Metal-organic frameworks (MOFs) have recently emerged as a promising candidate for the immobilization of enzymes due to their diversified structures and porosity. However, it is difficult to handle and fully recover the enzyme-MOF composites from the reaction medium due to their nanometer size and good dispersity in solvents, which limits their practical applications. Here, a novel enzyme-MOF composite with both highly stable and easily reusable features was prepared via encapsulating catalase/ZIF-8 nanocrystals into large mesoporous silica layer (silica@CAT/ZIF-8). This immobilized system exhibited high activity recovery (81%). The silica layer around the catalase/ZIF-8 particles provided a “shield” to protect from biological and chemical degradation for enzyme. As a result, the silica@CAT/ZIF-8 composites exhibited higher stability against proteolytic agent and extreme conditions (such as low pH) than that of conventional catalase/ZIF-8 composites. More importantly, the micrometer-sized silica@CAT/ZIF-8 can be easily repeatedly used without obvious activity loss. The silica@CAT/ZIF-8 composites still remained 50% of their original activity after 10 cycles, whereas the conventional catalase/ZIF-8 composites only retained 7% of their original activity after 5 cycles. These results demonstrated that this approach could be an efficient strategy to prepare enzyme-ZIF-8 composite with both high stability and excellent recyclability.
研究领域:
生物化学
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材料科学
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2023
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IF 3.6
Ya Chu,Weiqiang Zhang,Yurong Guo,Guangjiu Zhao
Silica-coated perovskite quantum dots (QDs), which exhibit exceptional photophysical properties, hold great promise for various optoelectronic applications. Nonetheless, the issue of insufficient stability poses a significant challenge to their continued advancement and widespread adoption. Herein, we present a novel approach for the synthesis of silica-coated CH 3 NH 3 PbBr 3 (CH 3 NH 3 = MA) QDs with exceptional stability and luminescence, which utilized hydrophobic ionic liquids (ILs) with unlike alkyl chain lengths as surface ligands. As the alkyl chain length of the hydrophobic ILs increased, we observed a blue-shift in the wavelength and a reduction in the time required to reach maximum fluorescence for the silica-coated perovskite QDs . It not only effectively prevents QD aggregation but also accelerates the formation rate of the SiO 2 shell. The introduction of ILs generated the enhancement of photoluminescence quantum yield (PLQY) from 85% for the pristine sample to 92.83% for ILs treated C 16 -QDs@SiO 2 . Furthermore, the stability of the ILs-treated C 16 -QDs@SiO 2 was notably enhanced, with the fluorescence intensity retaining 80.5% after 40 days of storage. The as-prepared white light emitting diode (LED) displayed a high color rendering index (CRI) of 75.3 and a correlated color temperature (CCT) of 7529 K. This work provides an alternative strategy to solve the challenging stability issue of silica-coated perovskite QDs and promote the silica-coated perovskite QDs to the practical application in solid-state LEDs.
研究领域:
材料科学
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光学
·
电子工程
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DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2020
·
IF 3.28
Chunxia Wu,Hongxiang Zhang,Shouzhi Wang,Wei Wang,Jun Dai
In this paper, we report a simple one-pot strategy to synthesize highly stable SiO 2 -coated orange-yellow CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots with strong orange-yellow photoluminescence . The microstructure characterization indicates that the CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots were effectively encapsulated by the SiO 2 . The SiO 2 -coated CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots show higher humidity stability and thermal stability than the CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 quantum dots without SiO 2 coating. The white light-emitting diodes (WLEDs) were obtained by coating orange-yellow CsPb 0.7 Mn 0.3 Br 0.75 Cl 2.25 @SiO 2 and blue CsPbBrCl 2 @SiO 2 quantum dots on the ultraviolet gallium nitride light-emitting diode chip. The as-prepared white light-emitting diodes show bright white light emission with a color coordinate of (0.3347, 0.2825), color rendering index of 82 and correlated color temperature of 5329 K. The results provide a simple method to fabricate stable orange-yellow luminescent material for white light-emitting diodes.
研究领域:
材料科学
·
光学工程
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DOI
高影响因子
Geoscience Frontiers
·
2020
·Vol. 12
·期 2
·957-963
·
IF 4.202
Ruijing Fu,Yaping Chen,Lingrui Wang,Zhiwei Ma,Pengfei Lv,Ying Song,Songrui Yang,Guanjun Xiao,Bo Zou
SiO 2 is the major mineral substance in the upper mantle of the earth. Therefore, studies of the silica-coated materials under high-pressure are essential to explore the physical and chemical properties of the upper mantle. The silica-confined CsPbBr 3 nanocrystals (NCs) have recently attracted much attention because of the improved photoluminescence (PL) quantum yield, owing to the protection of silica shell. However, it remains considerable interest to further explore the relationship between optical properties and the structure of CsPbBr 3 @SiO 2 NCs. We systemically studied the structural and optical properties of the CsPbBr 3 @SiO 2 NCs under high pressure by using diamond anvil cell (DAC). The discontinuous changes of PL and absorption spectra occurred at ∼1.40 GPa. Synchrotron X-ray diffraction (XRD) studies of CsPbBr 3 @SiO 2 NCs under high pressure indicated an isostructural phase transformation at about 1.36 GPa, owing to the pressure-induced tilting of the Pb-Br octahedra. The isothermal bulk moduli for two phases are estimated about 60.0 GPa and 19.2 GPa by fitting the equation of state. Besides, the transition pressure point of CsPbBr 3 @SiO 2 NCs is slightly higher than that of pristine CsPbBr 3 NCs, which attributed to the buffer effect of coating silica shell. The results indicate that silica shell is able to enhance the stabilization without changing the relationship between optical properties and structure of CsPbBr 3 NCs. Our results were fascinated to model the rock metasomatism in the upper mantle and provided a new ‘lithoprobe’ for detecting the upper mantle.
研究领域:
材料科学
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高压物理
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纳米材料
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光学性质
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地球物理学
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DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2024
·
IF 3.1
Jiao Ziyue,Wang Xinli,Gao Jie,Huang Xiao,Wang Yi
Perovskite quantum dots (PQDs) have demonstrated great promise in bioimaging applications owing to their outstanding photophysical properties. Nonetheless, their practicality is seriously limited by the instability of PQDs against moisture. Here we develop a post-synthetic ligand exchange strategy to construct silica-coated PQD (PQD@SiO 2 ) nanocrystals, which results in the simultaneous improvement of photoluminescence efficiency and moisture stability. More importantly, compared to the classical in-situ ligand exchange method of fabricating PQD@SiO 2 , the issues of chemical etching and resultant photoluminescence degradation are judiciously overcome. Employing the proposed PQD@SiO 2 , we showcase their robust usefulness in labeling chlorella, paving the way for PQD-based in-vivo photoluminescence bioimaging methodology.
研究领域:
生物成像
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材料科学
·
纳米医学
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DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Rui Tian,Jiamin Chai,Yuhui Yang,Rui Zhang,Hua Yang,Xuehua Sun,Haoyu Li
The confinement effect of silica nanoparticles (SNPs) can significantly enhance the fluorescence and sensing performance of metal nanoclusters. In this study, silver nanoclusters (Ag NCs) were encapsulated within silica nanoparticles (SNPs) via a reverse microemulsion method to form a silver nanoclusters/silica nanoparticles (Ag NCs/SNPs) composite. The composite exhibited superior fluorescence properties compared to bare Ag NCs. It was found that cefixime (Cfx) could effectively quench the fluorescence of Ag NCs/SNPs (λex = 265 nm; λem = 298 nm). Based on this, a novel fluorescence method was developed for the detection of Cfx. Under optimal conditions, the probe showed a linear response to Cfx concentrations ranging from 0.77 to 24.4 µmol L−1, with a limit of detection (LOD) of 0.37 µmol L−1 (LOQ = 1.23 µmol L−1). The method demonstrates high selectivity for Cfx against common interferents. When applied to the analysis of pharmaceutical samples and human serum sample, the method yielded satisfactory recovery rates of 92.57–109.83% and 93.73–102.05%, respectively, with relative standard deviations (RSD) below 6.51%. These results confirm that the proposed sensing system is robust and reliable, indicating its great potential for application in pharmaceutical quality control and the detection of Cfx in biological samples.
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DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
·
2018
·
IF 9.89
Ying Liu,Fei Li,Quanlin Liu,Zhiguo Xia
All inorganic cesium lead halide CsPbX3 (X = Cl, Br, I) perovskite nanocrystals (NCs) are generally considered to be sensitive and even decompose when exposed to ambient humidity. Herein, we perform a well-controlled investigation of the effect of postsynthetic water treatment of the as-prepared CsPbX3 NCs on the photoluminescence quantum yields (PLQYs) and stability, and one can find that the surface defective layer of CsPbX3 NCs can be dissolved into water and we can further separate the supernatant CsPbX3 NCs hexane solution from the water, which improves the PLQYs of CsPbCl3, CsPbBr3, CsPbI3 from 5%, 69.3%, 68.1% to 78.5%, 95.5%, 91%, respectively. As a synergetic effect, a trace amount of residual water facilitated the hydrolysis of tetramethyl orthosilicate, leading to the formation of SiO2-coated CsPbX3 NCs with high stability. The stable green-emitting CsPbBr3/SiO2 composite is used as an example to combine with red K2SiF6:Mn4+ to fabricate the light-emitting diodes device on the blue InGaN chip, which displays wide color gamut (128% of National Television Standard Committee standard), providing the possibility for liquid-crystal display backlight utilization.
研究领域:
材料科学
·
光学工程
·
化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）