Synergetic SERS Enhancement in a Metal-Like/Metal Double-Shell Structure for Sensitive and Stable Application
Synergetic SERS Enhancement in a Metal-Like/Metal Double-Shell Structure for Sensitive and Stable Application
复制标题
类金属/金属双壳结构中的协同 SERS 增强，可实现灵敏和稳定的应用
DOI：
10.1021/acsami.6b15396
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发表时间：
2017-04-19
影响因子：
9.5
通讯作者：
Kang, Junyong
中科院分区：
文献类型：
--
作者：
Ban, Rongcheng;Yu, Yingjian;Kang, Junyong
由于贵金属纳米结构的热/化学不稳定性或高光学损耗，考虑到各种极端条件下的实际生物传感应用，寻找替代等离子体材料变得越来越紧迫。本论文将氮化钛（TiN）作为一种低损耗的类金属材料，同时具有优异的热稳定性和化学稳定性，并将其与Ag空心纳米球（HNS）纳米结构复合，作为一种有效的表面增强拉曼散射（Sers）基底，实现高灵敏度和高稳定性的分子检测。由于球形复合纳米球周围的多模局部表面等离子体共振和精确控制的等离子体阵列内的超小纳米间隙所产生的“间隙效应”，在该Sers基底上成功地诱导了强烈增强的局部场。结合Ag和TiN之间独特的电荷转移过程，实现了涉及物理和化学机制的协同增强Sers灵敏度。特别是通过TiN的隔离，实现了对TiN Ag HNS阵列的持久拉曼检测，显示出巨大的实际应用潜力。
Because of either thermal/chemical instability or high optical loss in noble metal nanostructures, searching for alternative plasmonic materials is becoming more and more urgent, considering the practical biosensing applications under various extreme conditions. In this work, titanium nitride (TiN), a low-loss metal-like material with both excellent thermal and excellent chemical stabilities, was proposed to composite with Ag hollow nanosphere (HNS) nanostructures as an effective surface-enhanced Raman scattering (SERS) substrate to realize both highly sensitive and highly stable molecular detection. Because of the multiple-mode local surface plasmon resonance around the spherical composite nanospheres and the "gap effect" derived from the ultrasmall nanogaps within the precisely controlled plasmonic arrays, an intensively enhanced local field was successfully induced on this SERS substrate. Combined with the unique charge transferring process between Ag and TiN, a synergistically enhanced SERS sensitivity involving both physical and chemical mechanisms was achieved. Especially, with the isolation of TiN, a time-durable Raman detection on these TiN Ag HNS arrays was accomplished, showing great potential for practical applications.