SENSORS AND ACTUATORS B-CHEMICAL
·
2011
·
IF 3.37
Chuanyi Tao,Xueming Li,Jianchun Yang,Yanqi Shi
An optical fiber sensing element based on luminescence quenching of cryptophane-A/silica nanowires was successfully constructed and used to dynamically monitor methane gas at low concentration below 3.5% (v/v). The optical fiber device was designed to operate via luminescence reflection. The sensing properties of optical sensing element to methane at room temperature were characterized. The sensing element shows an intensive and stable blue luminescence when excited by UV light source at wavelength of 380 nm, and it is efficiently quenched by molecular methane. The response of the sensing element demonstrates excellent linear Stern–Volmer behavior at the fixed wavelength 439 nm within the methane concentration range between 0.1% and 3.5% (v/v). A detection limit of below 0.1% (v/v) is estimated for the methane sensing element. This newly developed methane sensing element has significant advantages over the currently available methane sensors such as fast response and recovery (within seconds), good repeatability, selectivity, and long-term stability.
研究领域:
材料科学
·
光学工程
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2025
·
IF 3.1
Yan Zitao,Zhu Dachuan
A series of dual-lanthanide metal–organic frameworks (MOFs: Dy 1-x Ce x -BTC) have been successfully prepared by hydrothermal method using dysprosium (Dy 3+ ) and cerium (Ce 3+ ) ions as metal sources and 1,3,5-benzenetricarboxylic acid (H 3 BTC) as organic ligand, confirmed by XRD patterns and FT-IR spectra, and then the luminescence property, the application in detecting small organic molecules and structural stability have been discussed. Among the samples, Dy 0.8 Ce 0.2 -BTC exhibited two strongest emission peaks located at 485 nm and 578 nm under the excitation at 295 nm, which are attributed to the excited electronic transitions of Dy 3+ from 4 F 9/2 to 6 H 15/2 and 6 H 13/2 . However, Dy 0.8 Ce 0.2 -BTC immersed in the solution of acetaldehyde (AH) demonstrated an obvious luminescence quenching with the calculated quenching constant ( K sv ) and the limit of detection ( LOD ) as 7.08 × 10 3 M −1 , 5.36 × 10 –7 M and high selectivity among the other tested organic solvents. Meanwhile, it revealed that the MOF could maintain good microstructural and recycle stability in deionized water, indicating a great potential as a turn-off fluorescent sensor for AH detection. Besides, the luminescence quenching mechanism was deduced from competitive absorption.
研究领域:
材料科学
·
化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 20
·期 9
·2306758
·
IF 13.3
Chen Li,Ke Liu,Dequan Jiang,Huacai Yan,En Chen,Yingying Ma,Haoming Cheng,Ting Wen,Binbin Yue,Yonggang Wang
Polymorphic phase transition is an essential phenomenon in condensed matter that the physical properties of materials may undergo significant changes due to the structural transformation. Phase transition has thus become an important means and dimension for regulating material properties. Herein, this study demonstrates the pressure-induced multi-transition of both structure and physical properties in violet phosphorus, a novel phosphorus allotrope. Under compression, violet phosphorus undergoes sequential polymorphic phase transitions. Concomitant with the first phase transition, violet phosphorus exhibits emergent insulator–metal transition, superconductivity, and dramatic switching from positive to negative photoconductivity. Remarkably, the resistance of violet phosphorus shows a sudden drop of around 10 7 along with the phase transition. In addition, piezochromism from translucent red to opaque black and suppression of photoluminescence are observed upon compression. Of particular interest is that the sample irreversibly transforms into black phosphorus with a pronounced discrepancy in physical properties from the pristine violet phosphorus after decompression. The abundant polymorphic transitions and property changes in violet phosphorus have significant implications for designing novel pressure-responsive electronic/optoelectronic devices and exploring concealed polymorphic transition materials.
研究领域:
凝聚态物理
·
材料科学
·
高压物理
·
半导体物理
·
光学材料
·
相变动力学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Adnan Khan,Xu Sang,Jiaxin Yang,Muhammad Ikram,Li Yang,Sadia Rehman,Rui Xu,Feng Song,Ming Feng
This study presents the synthesis and characterization of upconverter nanostructures consisting of a perovskite host matrix, CaZrO 3 , co-doped with trivalent ytterbium (Yb 3+ ) and europium (Eu 3+ ), denoted as CaZrO 3 :Yb 3+ /Eu 3+ . Single-doped CaZrO 3 :Eu 3+ samples were excited using a 394 nm UV source, while CaZrO 3 :Yb 3+ /Eu 3+ samples were excited with a 980 nm diode laser source. Yb 3+ ions efficiently absorb the 980 nm light and transfer the absorbed energy to the nearby ion Eu 3+ ions, leading to the emission of visible light around 590, 614, and 655 nm, respectively. The emission spectra of Eu 3+ ions exhibit an initial increase with increasing Yb 3+ concentration, peaking at 7 mol%, followed by a decrease due to luminescence quenching. The decay lifetime of Eu 3+ ions under 300 nm excitation decreases simultaneously with increasing Yb 3+ concentration, indicating energy migration between Yb 3+ and Eu 3+ . Detailed explanations of the energy transfer mechanism between Yb 3+ and Eu 3+ ions are provided, supported by equations and diagrams. This study provides valuable insights into the optimization of dopant concentrations for enhancing upconversion luminescence in CaZrO 3 :Yb 3+ /Eu 3+ nanostructures, with 3 mol% Eu 3+ concentration identified as optimal based on preliminary experiments. The findings presented in this paper contribute to the understanding of energy transfer processes in luminescence upconversion materials and highlight the potential of CaZrO 3 :Yb 3+ /Eu 3+ nanostructures for applications in lighting, displays, and bio-imaging. This work represents a significant advancement in the field of upconversion luminescence emission, particularly in the utilization of CaZrO 3 codoped with Yb 3+ and Eu 3+ , and lays the foundation for further research in this area.
研究领域:
材料科学
·
光学
·
纳米技术
·
发光材料
·
光子学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2024
·
IF 6.1
Zhi-Jie Wang,Ming-Jing Shen,Zhi-Peng Rao,Pei-Zhi Huang,Meng-Meng Lun,Bo-Wen Deng,Jun-Yi Li,Chang-Feng Wang,Hai-Feng Lu,Da-Wei Fu,Yi Zhang
Organic–inorganic metal halides (OIMHs) possessing switchable optical and electrical properties hold significant promise for applications in multifunctional sensors, switching devices, and information storage. However, the challenge lies in achieving effective regulation of optical/electric responses through structural design strategies, and materials with structural phase transition coupling photoluminescence (PL) quenching are also relatively rare. Here, by employing halogen engineering to modify the parent compound (TEMA)PbBr3 (TEMA = triethylmethylammonium), we successfully obtained two derivatives (TECA)PbBr3 and (TEBA)PbBr3 (TECA = triethylchloromethylammonium and TEBA = triethylbromomethylammonium). Halogen engineering successfully introduces halogen–halogen interactions between PbBr3n− inorganic frameworks and organic cations, which increases the stretching distortion of the PbBr6 octahedral framework of (TECA)PbBr3 and (TEBA)PbBr3, accompanied by prominent orange-red broadband emission behavior in (TECA)PbBr3 and (TEBA)PbBr3. Meanwhile, the phase transition temperatures (Tp) of (TECA)PbBr3 and (TEBA)PbBr3 have also been significantly increased compared to (TEMA)PbBr3, and two derivatives demonstrated switchable dielectric responses. Impressively, the reversible structural phase transition of (TECA)PbBr3 and (TEBA)PbBr3 dominates the outright PL quenching behavior, while still maintaining high PL emission intensity below the Tp. This represents a rare and extraordinary phenomenon in the realm of bistable responsive materials. This work provides a feasible strategy for designing and modulating photoluminescent phase transition materials and deepens understanding of the structural–performance relationship.
研究领域:
材料科学
·
光电技术
·
固体物理
·
化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）