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学者姓名：方晓惠
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摘要 ：
Surface-enhanced Raman scattering (SERS) has been widely used owing to its high sensitivity and rapid response. In particular, 3D SERS-active platforms greatly extend the interaction area and ensure the ability to directly detect trace amounts of molecules in liquids. A silver-coated capillary, with the ability of liquid sampling and light guiding, provides a new platform for high-performance SERS substrates. In this paper, the silver mirror reaction was used for coating silver on the outer wall of the capillary. PDMS was used as a coating material to protect the silver film. Because of the silver coating, Mie scattering and Raman scattering in the liquid channel can be refocused and reflected back which greatly reduces the propagation loss and extends the interaction length. An enhancement factor as high as 10(8) and a detection limit of 10(-10) M of rhodamine 6G in aqueous solution have been achieved. Moreover, the SERS intensity is homogeneous across the end face of the liquid channel, with the relative standard deviation (RSD) value changing within 7%. The large area and high homogeneity greatly reduce the requirement of light coupling precision and liquid injection pressure. Using a common flange optical fiber connector, the capillary can be simply connected and aligned with a multimode fiber with a detection limit of 10(-8) M. The experiment results show great potential for the development of an optofluidic integrated system in the future.
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| GB/T 7714 | Kang, Chen , Sun, Zhoutao , Fang, Xiaohui et al. Molecular trace detection in liquids using refocusing optical feedback by a silver-coated capillary [J]. | NANOSCALE ADVANCES , 2021 . |
| MLA | Kang, Chen et al. "Molecular trace detection in liquids using refocusing optical feedback by a silver-coated capillary" . | NANOSCALE ADVANCES (2021) . |
| APA | Kang, Chen , Sun, Zhoutao , Fang, Xiaohui , Zha, Lei , Han, Yu , Liu, Hongmei et al. Molecular trace detection in liquids using refocusing optical feedback by a silver-coated capillary . | NANOSCALE ADVANCES , 2021 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
The development of Surface Enhanced Raman Scattering (SERS) promotes the wide application of Raman spectroscopy in chemical and biomolecular detection. SERS detection relies on analytes in close contact with the metallic surface, and therefore direct molecular trace detection in the liquid phase is difficult. In this paper, static liquid phase SERS detection was performed simply using a capillary without pre-functionalization. Gold nanoparticles (AuNPs) with an optimized size ensure localized surface plasmons in resonance with the exciting laser light. Grazing incidence and multimode interference in the capillary ensure that the longitudinal Raman signal is effectively excited and accumulated. An enhancement factor as high as 108 and a detection limit of 10-9 M of crystal violet in aqueous solution have been achieved. © 2021 The Royal Society of Chemistry.
关键词 ：
Chemical detection Chemical detection Gold nanoparticles Gold nanoparticles Liquids Liquids Raman scattering Raman scattering Raman spectroscopy Raman spectroscopy Surface plasmon resonance Surface plasmon resonance Surface plasmons Surface plasmons Surface scattering Surface scattering Trace analysis Trace analysis
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| GB/T 7714 | Sun, Zhoutao , Kang, Chen , Fang, Xiaohui et al. A SERS-active capillary for direct molecular trace detection in liquids [J]. | Nanoscale Advances , 2021 , 3 (9) : 2617-2622 . |
| MLA | Sun, Zhoutao et al. "A SERS-active capillary for direct molecular trace detection in liquids" . | Nanoscale Advances 3 . 9 (2021) : 2617-2622 . |
| APA | Sun, Zhoutao , Kang, Chen , Fang, Xiaohui , Liu, Hongmei , Guo, Jinxin , Zhang, Xinping . A SERS-active capillary for direct molecular trace detection in liquids . | Nanoscale Advances , 2021 , 3 (9) , 2617-2622 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
A capillary coating with a photochromic spiropyran doped polydimethylsiloxane composite for HCl vapor detection is developed. By this simple method, that is, by the waveguiding capacity of capillary, the responsive fluorescence of spiropyran is efficiently collected to the spectrometer. A rapid sensing as short as 5 s to sub-ppm levels HCl vapor concentration (0.15-3 ppm) is achieved. Furthermore, the UV-responsive properties of spiropyran doped polydimethylsiloxane composite are investigated. Intriguingly, a wide range of UV intensity (20 mu W/cm(2) to 1447 mu W/cm(2)) is able to be linearly responded through the proposed strategy. This method does not need complex fabrication processes or chemical treatments but provides a robust signal and rapid response for small acid vapor concentration detection. We envision that this research may enhance the potential of photochromism for applications in acid vapor sensing and UV dosimeter.
关键词 ：
Fluorescence Fluorescence HCl vapor sensing HCl vapor sensing Polymer composite Polymer composite Spiropyran Spiropyran
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| GB/T 7714 | Guo, Jinxin , Wei, Xiqiao , Fang, Xiaohui et al. A rapid acid vapor detector based on spiropyran-polymer composite [J]. | SENSORS AND ACTUATORS B-CHEMICAL , 2021 , 347 . |
| MLA | Guo, Jinxin et al. "A rapid acid vapor detector based on spiropyran-polymer composite" . | SENSORS AND ACTUATORS B-CHEMICAL 347 (2021) . |
| APA | Guo, Jinxin , Wei, Xiqiao , Fang, Xiaohui , Shan, Renjie , Zhang, Xinping . A rapid acid vapor detector based on spiropyran-polymer composite . | SENSORS AND ACTUATORS B-CHEMICAL , 2021 , 347 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
Surface-enhanced Raman scattering (SERS) is a molecule-specific ultra-sensitive spectroscopic technique. With the development of portable Raman equipment, it has become possible to apply the SERS technique for rapid on-site detection. Therefore, the search for materials with excellent surface plasmon resonance (SPR) activity and high stability has become an important research focus in recent years. In this study, we successfully prepared plasmonic nanostructures with a large number of SERS "hotspots" using alloy nanoparticles (NPs) with tunable gold-silver mole ratios. These structures were composed of numerous narrow gapped gold-silver alloy NPs with diameters ranging from 10 to 100 nm. SERS property evaluation showed that the prepared alloy SERS substrates had good uniformity, and the performance of the substrates rapidly improved as the Ag content increased. Gold-stabilized Au-Ag alloy SERS substrates combine the high performance of the Ag SERS substrate and the excellent stability of Au. In addition, the wavelength of the SPR can be tuned by adjusting the mole ratio of Au and Ag to satisfy different excitation wavelengths. Thus, the Au-Ag alloy SERS substrates we prepared show good comprehensive performance. The lowest concentration of rhodamine 6G that can be homogeneously detected by the prepared Au(1)Ag(8)alloy substrate is 5 x 10(-12) M, and the enhancement factor is 5.1 x 10(8). Finite-difference time-domain (FDTD) theoretical calculations further confirmed our experimental results and theoretically demonstrated the unique properties of the Au-Ag alloy SERS substrates.
关键词 ：
Au-Ag alloy Au-Ag alloy Finite-difference time-domain (FDTD) Finite-difference time-domain (FDTD) Surface-enhanced Raman scattering (SERS) Surface-enhanced Raman scattering (SERS) Surface plasmon resonance (SPR) Surface plasmon resonance (SPR)
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| GB/T 7714 | Li, Hang , Liu, Hongmei , Qin, Youjian et al. Gold-Stabilized Gold-Silver Alloy Nanostructures as High-Performance SERS Substrate [J]. | PLASMONICS , 2020 , 15 (6) : 2027-2032 . |
| MLA | Li, Hang et al. "Gold-Stabilized Gold-Silver Alloy Nanostructures as High-Performance SERS Substrate" . | PLASMONICS 15 . 6 (2020) : 2027-2032 . |
| APA | Li, Hang , Liu, Hongmei , Qin, Youjian , Mu, Yunyun , Fang, Xiaohui , Zhai, Tianrui et al. Gold-Stabilized Gold-Silver Alloy Nanostructures as High-Performance SERS Substrate . | PLASMONICS , 2020 , 15 (6) , 2027-2032 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统，属于激光拉曼光谱检测、光电子和光纤光学应用领域。由便携式集成激光器拉曼探头、光谱仪、全反镜、分光镜、非球面透镜、显微物镜、变焦透镜组、CCD探测器组成。本申请旨在搭建一种能够在激光耦合过程中同时对光纤前后端面实时成像的系统。提出使用CCD结合透镜组通过精细调节来实时观测耦合位置，提高耦合效率。并以此提高拉曼信号的强度，提高拉曼系统的检测精度。
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| GB/T 7714 | 方晓惠 , 牛小玉 , 张新平 . 一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统 : CN201921341325.0[P]. | 2019-08-16 . |
| MLA | 方晓惠 et al. "一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统" : CN201921341325.0. | 2019-08-16 . |
| APA | 方晓惠 , 牛小玉 , 张新平 . 一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统 : CN201921341325.0. | 2019-08-16 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统及测试方法，属于激光拉曼光谱检测、光电子和光纤光学应用领域。由便携式集成激光器拉曼探头、光谱仪、全反镜、分光镜、非球面透镜、显微物镜、变焦透镜组、CCD探测器组成。本发明旨在搭建一种能够在激光耦合过程中同时对光纤前后端面实时成像的系统。提出使用CCD结合透镜组通过精细调节来实时观测耦合位置，提高耦合效率。并以此提高拉曼信号的强度，提高拉曼系统的检测精度。
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| GB/T 7714 | 方晓惠 , 牛小玉 , 张新平 . 一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统及测试方法 : CN201910760052.1[P]. | 2019-08-16 . |
| MLA | 方晓惠 et al. "一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统及测试方法" : CN201910760052.1. | 2019-08-16 . |
| APA | 方晓惠 , 牛小玉 , 张新平 . 一种基于微结构光纤的拉曼测试辅助调节耦合的实时成像系统及测试方法 : CN201910760052.1. | 2019-08-16 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
一种钙钛矿结构RNH3PbBr3纳米晶荧光材料的制备方法，属于发光材料技术领域。该方法将RNH3Br与PbBr2溶于极性有机溶剂中并加入一定量的烷基胺类晶粒抑制剂以形成前驱体溶液，取适量前驱体溶液滴加入临界极性混合有机溶剂中，使钙钛矿纳米晶析出。本发明在常温下进行，制备过程简便，反应时间短，产率高。所获得的的钙钛矿纳米晶具有良好的稳定性和较高的荧光效率，在电致发光、显示器件、激光器件中具有潜在的应用前景。
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| GB/T 7714 | 刘红梅 , 韩佳 , 穆云云 et al. 一种钙钛矿结构RNH3PbBr3纳米晶荧光材料的制备方法 : CN201910514990.3[P]. | 2019-06-13 . |
| MLA | 刘红梅 et al. "一种钙钛矿结构RNH3PbBr3纳米晶荧光材料的制备方法" : CN201910514990.3. | 2019-06-13 . |
| APA | 刘红梅 , 韩佳 , 穆云云 , 李行 , 方晓惠 , 张新平 . 一种钙钛矿结构RNH3PbBr3纳米晶荧光材料的制备方法 : CN201910514990.3. | 2019-06-13 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
We numerically and experimentally investigate the propagation properties of dissipative soliton in single mode fiber. The M-shaped spectrum is found to evolve into a spectrum with two deep valleys. The depth of valleys is polarization dependent because of the nonlinear birefringence. The simulation results agree well with the experimental results. After a segment of fiber propagation, the input pulse can be reproduced using a bandpass filter to filter out the spectrum between the two deep valleys.
关键词 ：
Dissipative soliton Dissipative soliton Nonlinear fiber optics Nonlinear fiber optics Polarization dependent Polarization dependent
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| GB/T 7714 | Liu, Jianwu , Fang, Xiaohui , Niu, Xiaoyu et al. M-shaped dissipative solitons with polarization-dependent evolution dynamics [J]. | OPTICS COMMUNICATIONS , 2019 , 438 : 102-105 . |
| MLA | Liu, Jianwu et al. "M-shaped dissipative solitons with polarization-dependent evolution dynamics" . | OPTICS COMMUNICATIONS 438 (2019) : 102-105 . |
| APA | Liu, Jianwu , Fang, Xiaohui , Niu, Xiaoyu , Zhang, Xinping . M-shaped dissipative solitons with polarization-dependent evolution dynamics . | OPTICS COMMUNICATIONS , 2019 , 438 , 102-105 . |
| 导入链接 | NoteExpress RIS BibTex |
摘要 ：
CsPbBr3 nanocrystals have attracted great interest owing to their high fluorescence quantum efficiency, adjustable photoluminescence wavelength, and good stability. We report a device that consists of disordered gold nanorods underneath a film of CsPbBr3 nanocrystals. Two-photon pumping using femtosecond laser pulses at 800 nm enables amplified spontaneous emission (ASE) at about 523 nm. In this work, a narrow peak with linewidth of 5 nm is observed when the pump fluence reaches a low threshold of 0.65 mJ/cm(2). The results show that plasmonic resonance of gold nanorods improves the emission transition rate and enables low threshold ASE.
关键词 ：
Femtosecond pulses Femtosecond pulses Inorganic perovskite nanocrystals Inorganic perovskite nanocrystals Plasmonic scattering Plasmonic scattering Random laser Random laser Two-photon pumping Two-photon pumping
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| GB/T 7714 | Liu, Shaoying , Fang, Xiaohui , Wang, Yimeng et al. Two-photon pumped amplified spontaneous emission based on all-inorganic perovskite nanocrystals embedded with gold nanorods [J]. | OPTICAL MATERIALS , 2018 , 81 : 55-58 . |
| MLA | Liu, Shaoying et al. "Two-photon pumped amplified spontaneous emission based on all-inorganic perovskite nanocrystals embedded with gold nanorods" . | OPTICAL MATERIALS 81 (2018) : 55-58 . |
| APA | Liu, Shaoying , Fang, Xiaohui , Wang, Yimeng , Zhang, Xinping . Two-photon pumped amplified spontaneous emission based on all-inorganic perovskite nanocrystals embedded with gold nanorods . | OPTICAL MATERIALS , 2018 , 81 , 55-58 . |
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摘要 ：
Plasmonic nanocavity arrays were achieved by producing isolated silver semi-cylindrical nanoshells periodically on a continuous planar gold film. Hybridization between localized surface plasmon resonance (LSPR) in the Ag semi-cylindrical nanoshells (SCNS) and surface plasmon polaritons (SPP) in the gold film was observed as split bonding and anti-bonding resonance modes located at different spectral positions. This led to strong local field enhancement and confinement in the plano-concave nanocavites. Narrow-band optical extinction with an amplitude as high as 1.5 OD, corresponding to 97% reduction in the transmission, was achieved in the visible spectrum. The resonance spectra of this hybrid device can be extended from the visible to the near infrared by adjusting the structural parameters.
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| GB/T 7714 | Liu, Feifei , Zhang, Xinping , Fang, Xiaohui . Plasmonic plano-semi-cylindrical nanocavities with high-efficiency local-field confinement [J]. | SCIENTIFIC REPORTS , 2017 , 7 . |
| MLA | Liu, Feifei et al. "Plasmonic plano-semi-cylindrical nanocavities with high-efficiency local-field confinement" . | SCIENTIFIC REPORTS 7 (2017) . |
| APA | Liu, Feifei , Zhang, Xinping , Fang, Xiaohui . Plasmonic plano-semi-cylindrical nanocavities with high-efficiency local-field confinement . | SCIENTIFIC REPORTS , 2017 , 7 . |
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