介孔SiO<sub>2</sub>薄膜增敏SERS基底在消逝波激励下的特性表征

引用本文: 赵乔, 逯丹凤, 陈晨, 祁志美. 介孔SiO₂薄膜增敏SERS基底在消逝波激励下的特性表征[J]. 物理化学学报, 2014, 30(12): 2335-2341. doi: 10.3866/PKU.WHXB201410131 shu

Citation: ZHAO Qiao, LU Dan-Feng, CHEN Chen, QI Zhi-Mei. Characterization of Mesoporous Silica Film Sensitized SERS Substrates Based on Evanescent-Wave Excitation[J]. Acta Physico-Chimica Sinica, 2014, 30(12): 2335-2341. doi: 10.3866/PKU.WHXB201410131 shu

介孔SiO₂薄膜增敏SERS基底在消逝波激励下的特性表征

赵乔 ^1, ,
逯丹凤 ^1, ,
陈晨 ^1, ,
祁志美 ^1,2,

基金项目:
国家重大科学仪器设备开发项目(2011YQ0301240802) (2011YQ0301240802)

国家自然科学基金(61377064) (61377064)

中国科学院科研装备研制项目(YZ201106) (YZ201106)

国民核生化灾害防护国家重点实验室开放基金项目(SKLNBC2014-11)资助 (SKLNBC2014-11)

摘要:

采用溶胶-凝胶分子模板法在50 nm 厚金膜表面制备约40 nm 厚介孔二氧化硅(MPS)薄膜, 然后在MPS薄膜表面静电自组装金纳米粒子(GNP)单层膜, 形成的多层膜结构用作表面增强拉曼散射(SERS)基底.利用扫描电镜观测到MPS薄膜具有表面开口多孔结构, 有助于小分子向薄膜内快速扩散. 基于时域有限差分(FDTD)方法对电场分布的仿真结果指出, 在表面等离子体共振(SPR)条件下分布于金膜与GNP之间的消逝场显著增强. 由于空间重叠, 该增强场能够高效激发MPS内富集的小分子拉曼信号, 产生的拉曼信号还可免受金属作用的干扰. 利用Kretschmann 结构和尼罗蓝(NB)拉曼活性分子测试了Au/MPS/GNP基底在785 nm激发波长下的SERS效果, 并与Au/GNP基底进行了比较. 结果表明, 在SPR条件下, Au/MPS/GNP基底能够导致较强的定向和背向拉曼信号, 而且在586 cm^-1处的背向拉曼信号强度是Au/GNP基底的40 倍, 这归功于MPS薄膜. 进一步测试表明背向拉曼信号强度与NB浓度成正相关. 这意味着Au/MPS/GNP基底具有良好的半定量检测本领.

关键词:

English

Characterization of Mesoporous Silica Film Sensitized SERS Substrates Based on Evanescent-Wave Excitation

1.
1. State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, P. R. China;
2. State Key Laboratory of NBC Protection for Civilian, Beijing 102205, P. R. China
Received Date: 28 July 2014
Available Online: 27 November 2014
Fund Project:
国家重大科学仪器设备开发项目(2011YQ0301240802)

国家自然科学基金(61377064)

中国科学院科研装备研制项目(YZ201106)

国民核生化灾害防护国家重点实验室开放基金项目(SKLNBC2014-11)资助

Abstract:

Sol-gel copolymer templated mesoporous silica (MPS) films of ~40 nm thickness were fabricated on the 50-nm-thick ld films sputtered on glass substrates. A top monolayer of ld nanoparticles (GNPs) was subsequently self-assembled on the MPS film to form an Au/MPS/GNPmultilayer structure for surface-enhanced Raman scattering (SERS) spectroscopy based on evanescent wave excitation. The open-pore structure of the MPS films, which was conducive to the rapid diffusion of small molecules into the film, was observed by scanning electron microscopy. Simulation using finite difference time domain (FDTD) solutions indicates that the evanescent field between the Au film and GNP layer of the Au/MPS/GNP substrate can be significantly enhanced under the surface plasmon resonance (SPR) condition. Owing to the complete spatial overlap, this enhanced field enables to superefficiently excite SERS signals from small molecules adsorbed in the MPS film. Moreover, the MPS film can effectively prevent the direct metal-molecule interaction, making the SERS signal immune to the interference by the metal. The SERS effect of the Au/MPS/GNP substrate loaded with Raman-active Nile blue (NB) molecules was investigated at 785 nm excitation wavelength with the Kretschmann configuration, and the experimental results were compared with those obtained using theAu/GNP substrate.With theAu/MPS/ GNP substrate very strong Raman signals were detected on the prism and air sides, respectively, under the SPR condition. The air-side Raman peak at 586 cm^-1 is 40 times as high as that with the Au/GNP substrate. This enhancement is attributed to the open-pore MPS film. The further measurements reveal a positive correlation between the air-side Raman peak intensity and the NB concentration of the solution sample, giving a sign that the Au/MPS/GNP substrate could be used for quasi-quantitative analysis.

Key words:

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沈阳化工大学材料科学与工程学院沈阳 110142

介孔SiO₂薄膜增敏SERS基底在消逝波激励下的特性表征

English

Characterization of Mesoporous Silica Film Sensitized SERS Substrates Based on Evanescent-Wave Excitation

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

介孔SiO2薄膜增敏SERS基底在消逝波激励下的特性表征

English

Characterization of Mesoporous Silica Film Sensitized SERS Substrates Based on Evanescent-Wave Excitation

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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