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Au@Ag Core-shell Nanorods Self-assembled on polyelectrolyte multilayers for Ultra-High Sensitivity SERS Fiber Probes

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Journal of Wuhan University of Technology(Materials Science) 2023年第3期38卷 505-513页

作者：王文博 XIONG Wenhao LONG Yuting 李宏 State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China School of Science School of Chip IndustryHubei University of TechnologyWuhan 430068China

We demonstrated a chemical process in the fabrication of a SERS fiber probe with an ultrahigh *** synthesis was carried out by preparing Au@Ag core-shell nanorods (Au@Ag-NRs) selfassembled on polyelectrolyte (PE) multilayers,for which Au@Ag-NRs were controlled by adjusting the silver layer *** effect of silver layer thickness of Au@Ag-NRs on the SERS performance of the fiber probe was *** SERS fiber probe shows the best performance when the silver layer thickness is controlled at 8.57 *** the condition of optimizing silver layer thickness,the fiber probe exhibits ultra-high sensitivity (i e,10^(-10) M crystalline violet,CV),good reproducibility (i e,RSD of 3.5%) and ***,electromagnetic field distribution of the SERS fiber probe was also *** strongest enhancement is found within the core of fiber,whereas a weakened electromagnetic field exists in the fiber cladding *** SERS fiber probe can be a good candidate in ultra-trace detection for biomedical and environmental areas.

关键词： surface-enhanced Raman scattering(SERS) optical fiber probe self-assembly Au@Ag core-shell nanorods(Au@Ag-NRs) polyelectrolyte multilayers

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Probing surface interactions of underwater oleophobic polyelectrolyte multilayers

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Petroleum Science 2021年第1期18卷 307-321页

作者： Kai Li Wei Wang Zhi-Peng Yu Hang Jin Yun-Tong Ge Wei-Wei Gao Fan Xiao Hui-Rong Huang Ze-Heng Peng Jing Gong National Engineering Laboratory for Pipeline Safety MOE Key Laboratory of Petroleum EngineeringBeijing Key Laboratory of Urban Oil and Gas Distribution TechnologyChina University of PetroleumBeijing 102249China Key Laboratory of Environmental Protection Technology on Water Transport Tianjin Research Institute for Water Transport EngineeringTianjin 300456China

In the present work,the interaction mechanism of specific polyelectrolyte multilayers(PEMs),fabricated by layer-by-layer deposition of polydiallyldimethylammonium chloride(PDDA)and poly(sodium 4-styrenesulfonate)(PSS),is studied using atomic force *** underwater oil-repellency of PS S-capped PEMs was further explored by measuring the interaction forces between tetradecane droplets and PEMs-coated silica substrates under various *** force curves were analyzed following the Stokes-Reynolds-Young-Laplace theoretical *** consistency was achieved between the experimental and theoretical calculations at low NaCl concentrations(0.1 mM and 1 mM);however,underestimation of the attractive force was found as the NaCl concentration increases to moderate(10 mM)and high(100 mM)*** analyses and incorporated features toward a reduced surface charge density were considered based on the previous findings of the orientation of anionic benzenesulfonate moieties(Liu et *** Angew Chem Int Ed 54(16):4851-4856,***://***/10.1002/anie.201411992).Short-range steric hindrance interactions were further introduced to simulate"brush"effect stemming from nanoscale surface *** is demonstrated in our work that the PSS-capped PEMs remains a stable underwater lipophobicity against high salinity,which renders it potential application in surface wetting modification and anti-fouling.

关键词： Lipophobicity Salinity AFM polyelectrolyte multilayers Surface roughness

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Layer-by-layer self-assembly of polyelectrolyte multilayers on silica spheres as reversed-phase/hydrophilic interaction mixed-mode stationary phases for high performance liquid chromatography

Layer-by-layer self-assembly of polyelectrolyte multilayers ...

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第21届全国色谱学术报告会及仪器展览会

作者： Wenjie Zhao Xiuming Jiang Shujiao Ni Yun Guo Lijun He Guoqiang Xiang Henan University of Technology

＜正＞A series of stationary phases, comprising silica spheres and polyelectrolyte multilayers （PEMs） as the core and surface coating, respectively, were prepared via a layer-by-layer self-assembly approach for use in high-performance liquid chromatography. PEMs coatings were formed by the alternate deposition of positively charged poly（allylamine hydrochloride） and negatively charged poly（ethylene-alt-maleate）

关键词： Stationary phase Layer-by-layer self-assembly polyelectrolyte multilayers Reversed-phase/hydrophilic mixed-mode chromatography Poly(ethylene-alt-maleate)

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Dynamic modification of poly(dimethylsiloxane) microfluidic channels with self-assembly polyelectrolyte multilayers

Dynamic modification of poly(dimethylsiloxane) microfluidic ...

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第五届上海国际分析化学研讨会

作者： Peng Youyuan~* (Department of Chemistry,Quanzhou Normal University,362000,Quanzhou,Fujian province,362000

A hydrophilic poly(dimethylsiloxane)(PDMS) microchip with stable electroosmotic flow(EOF) was prepared by a simple and reproducible coating procedure with polyelectrolyte *** microchannel of PDMS chip was coated with a layer of poly-(allylamine hydrochloride)(PAH) and then poly(arylic acid)(PAA).The assembly was followed by electroosmotic flow(EOF) measurements and electrophoretic separation *** coated channel had an excellent stability and reproducibility,RSD of EOF values(n=6) on coated PDMS microchip was below 3%in two *** of BSA and insulin was performed on the coated chip,which generated 4.99×10,1.69×10 theoretical plates/m compared with the native PDMS/glass chip of 4.64×10,4.13×10,high resolution of 2.17 was achieved.

关键词： Microfluidic chip polyelectrolyte multilayers poly-(allylamine hydrochloride)(PAH) poly(arylic acid)(PAA)

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Controllable Synthesis of Au NRs and Its Flexible SERS Optical Fiber Probe with High Sensitivity

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Journal of Wuhan University of Technology(Materials Science) 2024年第1期39卷 7-16页

作者：熊文豪 WANG Wenbo LONG Yuting 李宏 State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China National 111 Research Center Microelectronics and Integrated Circuits School of ScienceHubei University of TechnologyWuhan 430068China

The surface-enhanced Raman scattering(SERS) optical fiber probes were successfully prepared by self-assembling on polyelectrolyte multilayers. Gold nanorods(Au NRs) were used as SERS enhancement material to give excellent biological affinity and stability to the SERS optical fiber probes. Au NRs were synthesized by seed growth method. The synergistic effect between AgNO_(3) and surfactant was investigated, and the highest yield was found when AgNO_(3) was 500 uL. Meanwhile, different SERS optical fiber probes were obtained by selecting silane coupling agent, polyelectrolyte multilayer and graphene oxide(GO) to treat quartz fiber. It was found that the SERS optical fiber probes obtained by the self-assembled on polyelectrolyte multilayers method performed better than those by other methods. In addition, Mapping was combined with finite element simulation to analyze the electromagnetic field distribution at the fiber end *** electromagnetic field distribution of Au NRs was investigated, the difference of electromagnetic field intensity around the Au NRs with different arrangements was compared, the strongest signal was obtained when the Au NRs were head-to-head. Finally, sensitivity of the optimized SERS optical fiber probes could reach 10^(-9)mol/L, with excellent stability and repeatability.

关键词： surface-enhanced Raman scattering(SERS) optical fiber probe gold nanorods(Au NRs) polyelectrolyte multilayers controllable synthesis

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QCM-D technology

QCM-D technology

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2009年全国高分子学术论文报告会

作者： Hans Uddenberg Q-sense AB Sweden

＜正＞The QCM-D technology as a means to characterise material properties of soft thin films:the advantage of combining techniques in situ and in real time.

关键词： QCM-D quartz crystal microbalance polymer brush hydrogel polyelectrolyte multilayers

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