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学者姓名：方晓惠
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Abstract ：
Wearable sweat sensors provide real-time monitoring of biomarkers, enabling individuals to gain real-time insight into their health status. Current sensors primarily rely on electrochemical mechanisms, limiting their capacity for the concurrent detection of multiple analytes. Surface-enhanced Raman scattering spectroscopy offers an alternative approach by providing molecular fingerprint information to facilitate the identification of intricate analytes. In this study, we combine a wearable Janus fabric for efficient sweat collection and a grapefruit optical fiber embedded with Ag nanoparticles as a sensitive SERS probe. The Janus fabric features a superhydrophobic side in contact with the skin and patterned superhydrophilic regions on the opposite surface, facilitating the unidirectional flow of sweat toward these hydrophilic zones. Grapefruit optical fibers feature sharp tips with the ability to penetrate transparent dressings. Its microchannels extract sweat through capillary force, and nanoliter-scale volumes of sweat are sufficient to completely fill them. The Raman signal of sweat components is greatly enhanced by the plasmonic hot spots and accumulates along the fiber length. We demonstrate sensitive detection of sodium lactate and urea in sweat with a detection limit much lower than the physiological concentration levels. Moreover, the platform shows its capability for multicomponent detection and extends to the analysis of real human sweat.
Keyword ：
sweat sensing sweat sensing microstructuredoptical fiber microstructuredoptical fiber wearable wearable surface-enhanced Raman scattering (SERS) surface-enhanced Raman scattering (SERS) Janus textiles Janus textiles
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| GB/T 7714 | Han, Yu , Fang, Xiaohui , Li, Hanlin et al. Sweat Sensor Based on Wearable Janus Textiles for Sweat Collection and Microstructured Optical Fiber for Surface-Enhanced Raman Scattering Analysis [J]. | ACS SENSORS , 2023 , 8 (12) : 4774-4781 . |
| MLA | Han, Yu et al. "Sweat Sensor Based on Wearable Janus Textiles for Sweat Collection and Microstructured Optical Fiber for Surface-Enhanced Raman Scattering Analysis" . | ACS SENSORS 8 . 12 (2023) : 4774-4781 . |
| APA | Han, Yu , Fang, Xiaohui , Li, Hanlin , Zha, Lei , Guo, Jinxin , Zhang, Xinping . Sweat Sensor Based on Wearable Janus Textiles for Sweat Collection and Microstructured Optical Fiber for Surface-Enhanced Raman Scattering Analysis . | ACS SENSORS , 2023 , 8 (12) , 4774-4781 . |
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Abstract ：
Rapid trace gas identification is challenging due to the low adsorptivity of gaseous molecules on solid substrates under ambient conditions. In this article, we present a gas sensor utilizing a capillary serving as a surface-enhanced Raman scattering (SERS) probe. The capillary is decorated with densely distributed Ag/ZnO nanocomposites within its microchannel, resulting in an enlarged specific surface area that enhances gas adsorption and chemical enhancement and provides abundant SERS hotspots. The introduction of gas into the capillary leads to the immediate appearance of distinctive Raman characteristic peaks, and the entire measurement process can be performed under ambient conditions. The detection limit for gases of NO2 and SO2 reaches as low as 0.1 ppb. Furthermore, the sensor exhibits the capability to identify components of mixed gases as well as effectively detect NO2 in vehicle exhaust emissions. With all of these advantages, the SERS-active capillary demonstrates promising potential for practical applications, particularly in the rapid and accurate identification of trace-level gases.
Keyword ：
surface-enhanced Raman scattering surface-enhanced Raman scattering nanocomposites nanocomposites nitrogen dioxide nitrogen dioxide gas sensor gas sensor capillary capillary
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| GB/T 7714 | Li, Hanlin , Fang, Xiaohui , Kang, Chen et al. Ag/ZnO Nanocomposite-Decorated Capillary for Rapid Trace Gas Identification Based on Surface-Enhanced Raman Scattering under Ambient Conditions [J]. | ACS APPLIED NANO MATERIALS , 2023 , 6 (23) : 22222-22230 . |
| MLA | Li, Hanlin et al. "Ag/ZnO Nanocomposite-Decorated Capillary for Rapid Trace Gas Identification Based on Surface-Enhanced Raman Scattering under Ambient Conditions" . | ACS APPLIED NANO MATERIALS 6 . 23 (2023) : 22222-22230 . |
| APA | Li, Hanlin , Fang, Xiaohui , Kang, Chen , Sun, Zhoutao , Liu, Hongmei , Zhang, Xinping . Ag/ZnO Nanocomposite-Decorated Capillary for Rapid Trace Gas Identification Based on Surface-Enhanced Raman Scattering under Ambient Conditions . | ACS APPLIED NANO MATERIALS , 2023 , 6 (23) , 22222-22230 . |
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Abstract ：
Photonic crystal fibers (PCFs), providing ingenious microfluidic channels and intense light guidance, have many advantages in the detection of three-dimensional surface-enhanced Raman scattering (SERS). In solid-core PCFs, the light interacts with the sample in the form of an evanescent field, which is weak and limits the SERS detection performance. In this paper, we propose a new mechanism based on avoided crossings between the fiber core mode and the surface mode, which greatly enhances the laser power ratio in the liquid channels and improves the SERS sensitivity. Numerical results show that the intensity in the liquid channels can be increased from 2.8 % to 42 %. To realize this avoided-crossing effect in PCFs experimentally, the silver mirror reaction was optimized which can decorate discrete and densely distributed silver nanoparticles on the hydroxylated surface of the microfluidic channels in less than 15 min. The resulting SERS-active suspended-core PCF has ultra-high sensitivity, with a detection limit of 10(-12) M, and an enhancement factor of 10(10) for crystal violet solution. It also provides good stability and reproducibility with a relative standard deviation of 4.8 %. This ultra-sensitive and highly reproducible PCF-SERS probe has great potential for application in rapid in-situ detection.
Keyword ：
Avoid crossing, in-situ detection Avoid crossing, in-situ detection Photonic crystal fiber Photonic crystal fiber Surface-enhanced Raman scattering Surface-enhanced Raman scattering
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| GB/T 7714 | Sun, Zhoutao , Fang, Xiaohui , Zha, Lei et al. Surface mode enhanced by avoided crossing in microstructure fibers for improved SERS sensing [J]. | SENSORS AND ACTUATORS B-CHEMICAL , 2022 , 368 . |
| MLA | Sun, Zhoutao et al. "Surface mode enhanced by avoided crossing in microstructure fibers for improved SERS sensing" . | SENSORS AND ACTUATORS B-CHEMICAL 368 (2022) . |
| APA | Sun, Zhoutao , Fang, Xiaohui , Zha, Lei , Cheng, Tonglei , Kang, Chen , Han, Yu et al. Surface mode enhanced by avoided crossing in microstructure fibers for improved SERS sensing . | SENSORS AND ACTUATORS B-CHEMICAL , 2022 , 368 . |
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Abstract ：
Three-dimensional surface-enhanced Raman scattering (SERS) platform based on microstructure fibers has many advantages for rapid liquid detection due to its microfluidic channels and light guidance. The fiber mode field distribution determines the light-analyte interaction strength but has rarely been studied in SERS applications. In this paper, we numerically and experimentally investigate the mode field distribution in suspended-core fibers decorated with gold nanoparticles. The interaction between the core mode and surface mode is controlled by changing the density of gold nanoparticles on the inner surface. The avoided crossing wavelength shifts linearly to red with the decrease of the nanoparticle spacing. With an optimized nanoparticle spacing of 20 nm, the avoided crossing occurs near the laser wavelength of 633 nm, which greatly increases the power ratio in the liquid channels and hence improves the SERS performance. The detection limit for crystal violet was 10-9 M, and the enhancement factor was 108. The avoided crossing mechanism can be applied to all fiber SERS probes for sensitivity improvement.
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| GB/T 7714 | Zha, Lei , Fang, Xiaohui , Han, Yu et al. Controlled fiber core mode and surface mode interaction for enhanced SERS performance [J]. | OPTICS EXPRESS , 2022 , 30 (25) : 44827-44836 . |
| MLA | Zha, Lei et al. "Controlled fiber core mode and surface mode interaction for enhanced SERS performance" . | OPTICS EXPRESS 30 . 25 (2022) : 44827-44836 . |
| APA | Zha, Lei , Fang, Xiaohui , Han, Yu , Zhang, Xinping . Controlled fiber core mode and surface mode interaction for enhanced SERS performance . | OPTICS EXPRESS , 2022 , 30 (25) , 44827-44836 . |
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Abstract ：
Surface-enhanced Raman scattering (SERS) is a rapid and nondestructive spectroscopic method for trace detection. The enhancement based on both electromagnetic and chemical mechanism requires the molecules to be in close contact with the SERS-active material. Therefore, it is difficult to detect trace amounts of molecules in liquid directly. In this paper, graphene oxide (GO) and Ag nanoparticles (AgNPs) are uniformly modified on the inner wall of the capillary. GO can provide chemical enhancement by adsorbing the analyte onto its flat surface and producing efficient charge transfer resonance with the analyte. AgNPs can provide strong localized surface plasmon resonance for electromagnetic enhancement, while capillary can shorten the molecular enrichment time and provide long light-analyte interaction length. The synergism of GO, AgNPs, and capillary makes the optofluidic platform have the ability of ultrasensitive and real-time detection. The detection limit of Rhodamine 6G and thiram is as low as 10(-12) and 10(-10) M, respectively, and the enhancement factor is as high as 0.9 x 10(10) and 10(8), which indicates that the SERS-active capillaries have great potentials in real-time ultratrace detection of water environment pollutants.
Keyword ：
surface-enhanced Raman scattering surface-enhanced Raman scattering real-time detection real-time detection graphene oxide graphene oxide capillary capillary optofluidic platform optofluidic platform
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| GB/T 7714 | Han, Yu , Fang, Xiaohui , Sun, Zhoutao et al. Ag Nanoparticle-Decorated Graphene Oxide Coatings on the Inner Walls of Optofluidic Capillaries for Real-Time Trace SERS Detection [J]. | ACS APPLIED NANO MATERIALS , 2022 , 5 (2) : 2445-2450 . |
| MLA | Han, Yu et al. "Ag Nanoparticle-Decorated Graphene Oxide Coatings on the Inner Walls of Optofluidic Capillaries for Real-Time Trace SERS Detection" . | ACS APPLIED NANO MATERIALS 5 . 2 (2022) : 2445-2450 . |
| APA | Han, Yu , Fang, Xiaohui , Sun, Zhoutao , Kang, Chen , Zha, Lei , Zhang, Xinping . Ag Nanoparticle-Decorated Graphene Oxide Coatings on the Inner Walls of Optofluidic Capillaries for Real-Time Trace SERS Detection . | ACS APPLIED NANO MATERIALS , 2022 , 5 (2) , 2445-2450 . |
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Abstract ：
Microstructure fibers, integrating microfluidic channels and light guidance in one fiber, enable three-dimensional surface-enhanced Raman scattering (SERS) detection for large signal accumulation. However, the available fiber SERS probes are complicated to prepare and they are not reusable. In addition, light interacts with analytes in a form of an evanescent field, which is very weak. In this paper, we developed a SERS platform based on suspended-core photonic crystal fibers decorated with Ag/ZnO nanocomposites on the inner surface for direct, ultrasensitive, and reusable analyte detection. The unique configuration not only transfers a core localized field to the liquid interface to greatly enhance the light-analyte interaction but also facilitates charge transfer to further improve the SERS detection sensitivity and degradation efficiency. The detection limit of crystal violet solution is 10-13 M, and the enhancement factor reaches 1011. The relative standard deviation is as low as 5.4%, ensuring the reproducibility of SERS detection. The probe has good photocatalytic performance and can degrade molecules under ultraviolet-light illumination within 20 min. This ultrasensitive and reusable SERS probe shows great application potential in rapid and in situ liquid detection.
Keyword ：
surface-enhanced Raman scattering surface-enhanced Raman scattering recyclable recyclable photodegradation photodegradation photonic crystal fiber photonic crystal fiber in situ detection in situ detection nanocomposite nanocomposite
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| GB/T 7714 | Sun, Zhoutao , Fang, Xiaohui , Kang, Chen et al. Plasmonic Ag/ZnO Nanoscale Villi in Microstructure Fibers for Sensitive and Reusable Surface-Enhanced Raman Scattering Sensing [J]. | ACS APPLIED NANO MATERIALS , 2022 , 6 (1) : 714-719 . |
| MLA | Sun, Zhoutao et al. "Plasmonic Ag/ZnO Nanoscale Villi in Microstructure Fibers for Sensitive and Reusable Surface-Enhanced Raman Scattering Sensing" . | ACS APPLIED NANO MATERIALS 6 . 1 (2022) : 714-719 . |
| APA | Sun, Zhoutao , Fang, Xiaohui , Kang, Chen , Han, Yu , Zha, Lei , Zhang, Xinping . Plasmonic Ag/ZnO Nanoscale Villi in Microstructure Fibers for Sensitive and Reusable Surface-Enhanced Raman Scattering Sensing . | ACS APPLIED NANO MATERIALS , 2022 , 6 (1) , 714-719 . |
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Abstract ：
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 , 3 (24) : 6934-6939 . |
| MLA | Kang, Chen et al. "Molecular trace detection in liquids using refocusing optical feedback by a silver-coated capillary" . | NANOSCALE ADVANCES 3 . 24 (2021) : 6934-6939 . |
| 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 , 3 (24) , 6934-6939 . |
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Abstract ：
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.
Keyword ：
Polymer composite Polymer composite Spiropyran Spiropyran HCl vapor sensing HCl vapor sensing Fluorescence Fluorescence
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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 . |
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Abstract ：
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.
Keyword ：
Surface plasmon resonance Surface plasmon resonance Raman spectroscopy Raman spectroscopy Trace analysis Trace analysis Chemical detection Chemical detection Gold nanoparticles Gold nanoparticles Surface plasmons Surface plasmons Raman scattering Raman scattering Surface scattering Surface scattering Liquids Liquids
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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 . |
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Abstract ：
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.
Keyword ：
Surface plasmon resonance (SPR) Surface plasmon resonance (SPR) Finite-difference time-domain (FDTD) Finite-difference time-domain (FDTD) Surface-enhanced Raman scattering (SERS) Surface-enhanced Raman scattering (SERS) Au-Ag alloy Au-Ag alloy
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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 . |
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