Journal of Analysis and Testing
·
2021
·Vol. 5
·期 1
·40-50
·
IF 0
Tan Xiao-Hong,Huang Guo-Bin,Cai Zhi-Xiong,Li Fei-Ming,Zhou Yan-Mei,Zhang Mao-Sheng
The application of all-inorganic CsPbX 3 (X = Cl − , Br − and I − ) perovskite nanocrystals (PNCs) is hindered by their poor stability under different environments (moisture, UV light and high temperature). Herein, we demonstrate a novel in-situ growth and post-coating technique to prepare monodisperse spherical sandwiched structured SiO 2 @CsPbX 3 @SiO 2 perovskite composites. In this strategy, the environmental stability of CsPbX 3 PNCs is remarkably improved due to protecting evenly distribution in the surface of composites through the design of spherical sandwiched structure, and the negative effects of SiO 2 coating on photoluminescence property of CsPbX 3 PNCs could be reduced effectively. Furthermore, regular monodisperse spherical structure and uniform size of composites greatly benefit their application in relative fields. The experiment results indicate that the as-prepared product have outstanding abilities of water-, oxidation- and UV radiation resistance. Finally, the SiO 2 @CsPbBr 3 @SiO 2 perovskite composites are successfully used for highly sensitive detection of Fe 3+ in water sample. The results show limit of detection (LOD) is 3 µM and good linearity is between 10 and 70 µM ( R 2 = 0.9963). Furthermore, the proposed perovskite composites have been successfully applied for the analysis of Fe 3+ in real samples with satisfactory results.
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Chong Liu,Zhicheng Wang,Na Zhang,Yue Li,Shulin Li,Xia Xin
The precise synthesis and self-assembly of metal nanoclusters (NCs) featuring customized morphologies and structures, represent a crucial step in the exploration of structure-property relationships and the discovery of new functionalities. This study presents a strategy to induce the self-assembly of copper nanoclusters ( Cu-NCs , Cu 4 I 4 (PPh 3 ) 4 ) into stable and highly fluorescent regular micron level hexagonal plates by nonionic surfactant Tyloxapol and mixed solvent (DMSO/H₂O). The aggregation-induced emission (AIE) behavior markedly enhanced the fluorescence quantum yield and lifetime of Ty-Cu-NCs , from 0.57 % and 68.6 ns to 22.60 % and 2.8 μs, representing a ∼40-fold improvement in both. Kinetic studies of the assembly process have revealed a sequence involving nucleation, aggregation, oriented growth and subsequent size enlargement. When varying the types of surfactants, the formation of Ty-Cu-NCs assembly with different morphologies was observed which indicated the unique role of Tyloxapol in directing the formation of hexagonal plates. It is noteworthy that the Ty-Cu-NCs assembly exhibits high selectivity and sensitivity towards Fe³⁺ ions, with a detection limit of 1.51 μM, which is considerably lower than the maximum permissible concentration of Fe³⁺ in tap water as per health standards. The combination of high fluorescence properties and selective ion detection capabilities renders these Ty-Cu-NCs assembly promising candidates for applications in ion sensing and anti-counterfeiting technologies.
研究领域:
材料科学
·
化学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Bing Zhang,Yixin Luo,Binqiong Peng,Lisha Zhang,Ning Xie,Dan Yue,Weidong Li,Bowen Qin,Wenjing Du,Zhenling Wang,Yilei Zhang
The paper presents a green and easily prepared water-soluble fluorescent nitrogen doped carbon dots (N CDs) synthesized by one-step hydrothermal process. The N CDs displays brilliant blue fluorescence excited by UV light, with excellent water solubility, and a quantum yield of 15.7 %. The fluorescence intensity of N CDs remains unchanged after 48 h of exposure to ultraviolet light, exhibiting good photostability. Moreover, the ion sensing characteristics of these N CDs have been explored for more than a dozen anions and cations. The result reflects that this fluorescent CDs exhibits excellent sensitivity and selectivity for Fe 3+ within a range spanning of 40 ∼ 500 μΜ with a limit of detection down to 0.22 μΜ. The principle of sensor sensing is likely related to the formation of the internal filtering effect (IFE), which leads to a decline in the fluorescence intensity of N CDs in aqueous solutions containing Fe 3+ . Due to the excellent water solubility, good photostability and high yield of N CDs, the application of prepared N CDs/polyvinyl alcohol (PVA) as fluorescent materials for white LED devices was explored. The prepared N CDs/PVA (NCP) composite film can also exhibit bright blue light under 365 nm excitation, indicating good application prospects in the area of white LED devices and agricultural films.
研究领域:
材料科学
·
光学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Tian-Xiang Li,Nengcui Zhang,Xu-ting Lan,Feng Wu,Yu-hui Xie,Dong Feng,Yuxin Liu,Yi Mei,Delong Xie
Nanocomposites incorporating carbon dots (CDs) and polymers have gained significant attention for various applications, including heavy metal ion detection. This study presents a novel composite that integrates CDs with amphiphilic polyurethane (PU) for enhanced fluorescence detection and absorption of Fe³⁺ ions in wastewater. The resulting nanocomposites exhibit superior mechanical stability, high sensitivity, and selectivity for Fe³⁺, with a remarkable 10 3 -fold enhancement in the limit of detection (LOD) for Fe³⁺ (from 0.38 µM to 0.98 nM) compared to CDs in solution. This enhancement is attributed to the interaction between the functional groups on the CDs and the polyethylene glycol segments of the PU matrix, leading to a red shift in fluorescence emission and improved stability. Additionally, the composite hydrogels show a 4.2-fold increase in Fe³⁺ absorption capacity compared to pure PU, due to the formation of stable complexes between the CDs and Fe³⁺ ions. Mechanistic insights into the absorption process are discussed using various modeling approaches. This hybrid fluorescent hydrogel platform presents a portable, cost-effective solution for Fe³⁺ detection and absorption in wastewater, with potential applications in bio-imaging, light-emitting diodes, and anti-counterfeiting.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
SPECTROSCOPY LETTERS
·
2025
·
IF 1.6
Ju Wei,Bingyu Luo,Jiao Fu,Shunli Zhou,E. Li,Xiaodong Su,Xiaotong Gao,Zhenfu Jia,Xiaojiang Li
To overcome the interference caused by the inner filter effect, this study optimally selected red fluorescence carbon dots as the signal source and constructed a novel dual-mode Ag@Red-CDs nanoprobe for the highly selective detection of Fe³+ using fluorescence and colorimetry. This probe is based on a unique reaction between Fe3+ and silver nanoparticles (AgNPs) that weakens the static quenching effect of AgNPs on R-CDs; at the same time, the depletion of AgNPs induces a change in the absorbance of the system. Under optimal conditions, the probe exhibited a linear fluorescence response in the Fe³+ concentration range of 0.10–25.00 μg/mL and a linear colorimetric response of 0.18–8.00 μg/mL. The detection limits for fluorescence and colorimetry were 0.31 μg/mL and 0.56 μg/mL, respectively. In spiked real samples, the fluorescence method achieved Fe³+ recovery rates of 99.10–102.34%, while the colorimetric method showed recovery rates of 99.83–101.42%. Overall, this research significantly broadened the potential applications of R-CDs-based materials for the quantitative detection of heavy metal ions in water bodies.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Kexing Chen,Qifeng Chen,Min Zhu
Detection of Fe 3+ is essential for environmental and food safety monitoring. However, conventional detection methods often require costly equipment and lengthy processes, limiting their on-site applications. To address these challenges, a fluorescent sensor was developed using carboxymethylated nanocellulose (CMCNF) and collagen fiber-based carbon quantum dots (CCQDs). The CCQDs, with a fluorescence quantum yield of 25.04 %, were synthesized via a microwave hydrothermal method using secondary collagen fibers. A selective and sensitive CMCNF/CCQDs sensor was fabricated by incorporating CCQDs into a CMCNF matrix through a simple solution-casting method. The CMCNF matrix ensured uniform dispersion and stability of the CCQDs, optimizing sensor performance. The sensor exhibited a linear detection range for Fe 3+ between 0 μM and 180 μM, with a corresponding linear equation of y = 0.3532 x + 0.6496 R 2 = 0.9932 . The limit of detection (LOD) for Fe 3+ was determined to be 3.84 μM. Excellent detection performance was demonstrated in real water samples, achieving recoveries from 99.45 % to 105.23 % and an RSD below 2 %. The fluorescence quenching mechanism underlying CCQDs and Fe 3+ interactions was systematically explored. This study provides a sustainable strategy for the high-value utilization of biomass waste and offers a portable approach for Fe 3+ detection.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2018
·Vol. 219
·期 24
·1800403
·
IF 2.492
Chunyan Zhang,Jianxin Luo,Wenjun Li,Lijuan Ou,Guipeng Yu,Chunyue Pan
An environment-friendly synthesis of a covalently bonded terbium(Tb)-complex-containing monodispersed fluorescent porous copolymer microspheres, and their highly selective detection of Fe 3+ are described. The as-made copolymer microspheres exhibit intense green fluorescence originating from Tb ions and high photostability in water. Encouragingly, the fluorescence of the copolymer microspheres can be selectively quenched by trace Fe 3+ due to the interaction between Fe 3+ and the ligands, which disturbs the coordination structure of Tb-complexes and inhibits the energy transfer from ligands to Tb ions. The intense fluorescence intensity, high fluorescence stability, together with the nanoscale and porous nature of the copolymer microsphere endows them with wide detection range (0–1500 µ m ) and low detection limit (2.1 µ m ) for selective recognition of Fe 3+ in aqueous environment. This study paves a new pathway for the function of porous copolymer microspheres being used as targeting for biological detection and environmental issues.
研究领域:
材料科学
·
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Analytical Methods
·
2025
·
IF 2.6
Nanhai Zhang,Deyan Liu,Rui Zhang,Qinghe Song,Guangjun He,Shixing Wang,Libo Zhang
The design and preparation of fluorescent sensors for detecting toxic ions in aqueous environments are of paramount importance. In this study, a europium metal–organic framework (Eu-MOF), constructed from Eu3+, the rigid 2,2′-biphenyldicarboxylic acid (2,2′-H2bpdc) ligand, and the auxiliary 1,10-phenanthroline (Phen) ligand, was synthesized through hydrothermal synthesis. The synthesized Eu-MOF demonstrated remarkable water stability, pH stability, thermal stability, and photostability. It showed a high quantum yield of 42.6%, along with an average fluorescence lifetime of 0.9002 ms, which could enhance its sensitivity when employed as a fluorescent probe. The Eu-MOF could function as a fluorescent probe to quantitatively detect trace amounts of Fe3+, CrO42− and Cr2O72− via fluorescence quenching. Their detection sensitivities are 1.527 × 104 M−1, 1.378 × 104 M−1 and 1.463 × 104 M−1 respectively, with detection limits as low as 0.28 μM, 0.19 μM and 0.09 μM. Additionally, the Eu-MOF sensor exhibited excellent selectivity, anti-interference ability, repeatability (after undergoing five cycles) and practical feasibility. Furthermore, a detailed investigation of its fluorescence properties and sensing mechanisms was carried out. Based on density functional theory calculations, two energy transfer pathways in the process of Eu3+ ion luminescence sensitized by the double ligands 2,2′-H2bpdc and Phen were identified. The fluorescence sensing mechanism of the Eu-MOF for detecting Fe3+, CrO42− and Cr2O72− involved photoinduced electron transfer from the antenna ligand to the organic molecules and competitive absorption of excitation energy. Owing to its high stability and sensitivity, the Eu-MOF holds great potential for practical applications as a sensor for Fe3+, CrO42− and Cr2O72− in aqueous environments.
研究领域:
分析化学
·
环境监测
·
材料科学
·
荧光探针
·
无机化学
·
传感器技术
✓ 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）