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Design of Ag nanorods for sensitivity and thermal stability of surface-enhanced Raman scattering

机译：表面增强拉曼散射敏感性和热稳定性Ag纳米棒设计

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The technology of surface-enhanced Raman scattering (SERS) has found many applications and may find more if it can possess both sensitivity and thermal stability. This paper reports a rational design of Ag nanorods to simultaneously achieve two competing goals: the sensitivity and the thermal stability of SERS substrates. The Ag nanorods are designed and synthesized using physical vapor deposition under the condition of glancing angle incidence. The working pressure of the vacuum chamber is controlled so the mean free path of depositing atoms is comparable to the dimension of the chamber, so as to grow Ag nanorods with small diameter, and small but clear separation for optimal SERS sensitivity. Such Ag nanorods are further capped with Al2O3 on their top surfaces to reduce the diffusion-induced coarsening at high temperatures, and thereby to improve the thermal stability for SERS detections. Meanwhile, since the side surfaces of Ag nanorods are not coated with oxides in this approach, the SERS sensitivity is largely preserved while good thermal stability is achieved.
机译：表面增强拉曼散射（SERS）的技术已经发现了许多应用，并且如果它可以具有敏感性和热稳定性。本文报告了AG纳米棒的合理设计，同时实现了两个竞争目标：SERS基材的敏感性和热稳定性。在瞥见角度入射条件下，使用物理气相沉积设计和合成Ag纳米棒。控制真空室的工作压力，使得沉积原子的平均自由路径与腔室的尺寸相当，以便为具有小直径的Ag纳米棒，但对于最佳的SERS敏感性而微小但清晰分离。这种Ag纳米棒在其顶表面上进一步用Al 2 O 3封盖，以减少高温下的扩散诱导，从而提高SERS检测的热稳定性。同时，由于Ag纳米棒的侧表面未在这种方法中涂覆氧化物，因此均大量保存，而良好的热稳定性是良好的热稳定性。

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