用于纳米探针应用的SERS–SEF多功能纳米颗粒的受控设计和制备：依赖于形态的SERS现象,The Journal of Physical Chemistry C

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用于纳米探针应用的SERS–SEF多功能纳米颗粒的受控设计和制备：依赖于形态的SERS现象
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2017-03-31 00:00:00 , DOI: 10.1021/acs.jpcc.7b00688
Sehoon Chang ₁ , Shannon L. Eichmann ₁ , Ting-Yun S. Huang ₁ , Wonjin Yun ₁ , Wei Wang ₁

Affiliation

已经开发了双模表面增强拉曼散射（SERS）-表面增强荧光（SEF）复合纳米颗粒，可以用作油藏示踪剂。这些复合纳米粒子由金属银纳米结构核，特定的染料分子和SiO _2组成外壳涂料。本文中，我们显示嵌入的染料分子可通过拉曼光谱和荧光光谱法检测到，并且由于强烈的SERS-SEF现象而显着提高了可检测性，其中荧光光谱的检测限（LOD）低至1 ppb，拉曼光谱的检测限低至10 ppb 。为了确定SERS和SEF信号增强的最佳结构，我们展示了这些现象如何受到复合纳米颗粒形态的显着影响。金属点的聚集状态以及金属和染料探针分子之间的距离是增强SERS和SEF信号的关键因素。通过在微乳液介质中控制良好的一锅法反应，可以设计出具有设计形态的复合纳米颗粒，[电子邮件保护] ₂核-壳结构或[受电子邮件保护的] ₂ / Ag卫星结构已经合成，并且各种染料已编码到这些复合纳米粒子中。我们已经证明[受电子邮件保护] ₂/ Ag卫星纳米粒子通过SERS和SEF现象均显示出最高的染料分子信号增强。对这些经过特殊设计的纳米颗粒在微通道中的检测和迁移率的成像研究表明，它们在微米大小的孔中且浓度低时可进行检测。本文提出的多功能复合纳米颗粒包含表现出不同荧光发射波长和指纹拉曼信号的不同染料。因此，这些经过战略设计的纳米颗粒为将来用作带条形码的智能储层示踪剂提供了可能的途径。

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Controlled Design and Fabrication of SERS–SEF Multifunctional Nanoparticles for Nanoprobe Applications: Morphology-Dependent SERS Phenomena

Dual-mode surface-enhanced Raman scattering (SERS)–surface-enhanced fluorescence (SEF) composite nanoparticles have been developed for possible use as oil reservoir tracers. These composite nanoparticles are composed of metal Ag nanostructured cores, specific dye molecules, and a SiO₂ shell coating. Herein, we show that the embedded dye molecules are detectable by both Raman and fluorescence spectroscopies and yield dramatically enhanced detectability due to strong SERS–SEF phenomena with limits of detection (LOD) as low as 1 ppb by fluorescence spectroscopy and 10 ppb by Raman spectroscopy. To determine the optimal structures for signal enhancement for both SERS and SEF, we show how these phenomena are significantly affected by morphologies of the composite nanoparticles. The aggregation status of metal dots and the distance between the metal and dye probe molecules are the crucial factors for enhancement of SERS and SEF signals. Through well-controlled one-pot reactions in microemulsion media, composite nanoparticles with designed morphologies, [email protected]₂ core–shell structures, or [email protected]₂/Ag satellite structures have been synthesized, and various dyes have been encoded into these composite nanoparticles. We have demonstrated that the [email protected]₂/Ag satellite nanoparticles exhibit the highest dye molecule signal enhancement through both SERS and SEF phenomena. Imaging studies on the detection and mobility of these specifically designed nanoparticles in microchannels show their detection within micron-sized pores and at low concentrations. The multifunctional composite nanoparticles presented herein contain different dyes which exhibit different fluorescence emission wavelengths and fingerprinted Raman signals. Thus, these strategically designed nanoparticles provide a possible pathway for future use as barcoded smart reservoir tracers.

更新日期：2017-03-31

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