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银/金刚石微粉复合材料对硝酸盐红外吸收特性的影响 被引量:4
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作者 汪洁生 徐明婵 +1 位作者 李春 元光 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2017年第9期2737-2742,共6页
中国海洋环境的污染日趋严重,其中大部分是由无机氮和磷酸盐导致。有效快速的监测海洋营养盐,尤其是硝酸盐,已成为一个显要的问题。传统的检测方法主要是利用化学分析法,更适合实验室测试之用。红外吸收光谱对海洋营养盐的实时监测具有... 中国海洋环境的污染日趋严重,其中大部分是由无机氮和磷酸盐导致。有效快速的监测海洋营养盐,尤其是硝酸盐,已成为一个显要的问题。传统的检测方法主要是利用化学分析法,更适合实验室测试之用。红外吸收光谱对海洋营养盐的实时监测具有重要意义,能够弥补传统方法的不足,并具有快速、同步监测多种营养盐等优点。但海水中的营养盐浓度极低,使得红外光谱检测极限难以满足要求。纳米材料能产生表面增强红外吸收(SEIRA)效应,利用此效应,使红外光谱检测海洋营养盐技术成为可能,优点得以发挥。纳米银(Ag)具有显著的表面等离子体共振效应,可以帮助实现SEIRA。金刚石具有过强的抗腐蚀性和其他特殊的性能,如高硬度和高光透射率,是理想的红外窗口材料。具体来说,利用热分解硝酸银的方法在硅基底(Si substrate)上制备了银/金刚石微粉(Ag/DP)复合材料,研究了银与金刚石微粉的不同比例对NaNO_3(一种主要海洋营养盐)的水溶液红外吸收的影响。结果表明,Ag/DP复合材料使NO_3^-的两种反对称伸缩振动νhigh和νlow的红外吸收有较大幅度提高;银与金刚石微粉比例为2∶1时,硝酸钠水溶液的红外吸收增强效果最佳。该实验结果将对海洋营养盐进行实时、长期、连续的检测提供重要信息,为海洋灾害预防、海洋环境污染治理等海洋领域提供有力的数据支持。 展开更多
关键词 海水污染 海水营养盐 SEIRA Ag/DP COMPOSITES
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多孔硅上银纳米粒薄膜的制备及其表面增强红外光谱(英文)
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作者 周小会 颜红 肖守军 《无机化学学报》 SCIE CAS CSCD 北大核心 2011年第11期2291-2297,共7页
通过简便的化学沉积法在多孔硅上制备银纳米粒薄膜用于表面增强红外光谱检测。通过Ag+与多孔硅表面的SiHx发生氧化还原反应将银纳米粒子沉积在多孔硅表面。红外探针分子溶解于无水乙醇中进而被均匀分散在多孔硅表面,实验结果显示:对氨... 通过简便的化学沉积法在多孔硅上制备银纳米粒薄膜用于表面增强红外光谱检测。通过Ag+与多孔硅表面的SiHx发生氧化还原反应将银纳米粒子沉积在多孔硅表面。红外探针分子溶解于无水乙醇中进而被均匀分散在多孔硅表面,实验结果显示:对氨基苯硫酚、对氨基苯甲酸和对氟苯硫酚3个探针分子的红外峰分别最大增强了10、85和21倍。银纳米粒的大小和形状等物理特性、探针分子是否有与银表面进行强结合的基团和芳烃结构、以及表面选律等因素影响表面增强红外的吸收效应。 展开更多
关键词 多孔硅 银纳米粒 表面增强红外光谱 SEIRA
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Revealing the kinetics of ionophore facilitating ion transport across lipid bilayers by surface enhanced infrared absorption spectroscopy
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作者 Qianwen Zhang Yang Liu +1 位作者 Jian Li Xinghua Xia 《Chinese Chemical Letters》 SCIE CAS CSCD 2020年第2期479-481,共3页
Ionophore can prominently improve the ion permeability of cell membrane and disrupt cellular ion homeostasis.Most studies regarding ionophore facilitating ion transmembrane transport focus on artificial liquid-liquid ... Ionophore can prominently improve the ion permeability of cell membrane and disrupt cellular ion homeostasis.Most studies regarding ionophore facilitating ion transmembrane transport focus on artificial liquid-liquid interfaces,which have large difference from the actual environment of cell membrane.Here,we construct a supported lipid bilayeron a gold nanoparticles film modified ZnSe prism as an appropriate model of cell membrane to investigate the dynamic of the ion transport facilitated by ionophore using surface enhanced infrared absorption spectroscopy(SEIRAS).We find that the ion transmembrane transport consists of two steps:The ion transmembrane transport starts with the association/disassociation between ion and ionophore at the edge of lipid bilayer;The second step is the transfer of ion-ionophore complex across lipid bilayer.Our results show that the complex transfer across the lipid bilayer is the rate determining step. 展开更多
关键词 seiras Ion TRANSMEMBRANE transport IONOPHORE KINETICS Supported LIPID BILAYERS
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Boron nitride nanoresonators for phonon-enhanced molecular vibrational spectroscopy at the strong coupling limit
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作者 Marta Autore Peining Li +10 位作者 Irene Dolado Francisco J Alfaro-Mozaz Ruben Esteban Ainhoa Atxabal Fèlix Casanova Luis E Hueso Pablo Alonso-González Javier Aizpurua Alexey Y Nikitin Saül Vélez Rainer Hillenbrand 《Light(Science & Applications)》 SCIE EI CAS CSCD 2017年第1期55-62,共8页
Enhanced light-matter interactions are the basis of surface-enhanced infrared absorption(SEIRA)spectroscopy,and conventionally rely on plasmonic materials and their capability to focus light to nanoscale spot sizes.Ph... Enhanced light-matter interactions are the basis of surface-enhanced infrared absorption(SEIRA)spectroscopy,and conventionally rely on plasmonic materials and their capability to focus light to nanoscale spot sizes.Phonon polariton nanoresonators made of polar crystals could represent an interesting alternative,since they exhibit large quality factors,which go far beyond those of their plasmonic counterparts.The recent emergence of van der Waals crystals enables the fabrication of highquality nanophotonic resonators based on phonon polaritons,as reported for the prototypical infrared-phononic material hexagonal boron nitride(h-BN).In this work we use,for the first time,phonon-polariton-resonant h-BN ribbons for SEIRA spectroscopy of small amounts of organic molecules in Fourier transform infrared spectroscopy.Strikingly,the interaction between phonon polaritons and molecular vibrations reaches experimentally the onset of the strong coupling regime,while numerical simulations predict that vibrational strong coupling can be fully achieved.Phonon polariton nanoresonators thus could become a viable platform for sensing,local control of chemical reactivity and infrared quantum cavity optics experiments. 展开更多
关键词 boron nitride phonon polaritons strong coupling surface-enhanced infrared absorption spectroscopy SEIRA
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