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Combining sonicated cold development and pulsed electrodeposition for high aspect ratio sub-10 nm gap gold dimers for sensing applications in the visible spectrum†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-07 00:00:00 , DOI: 10.1039/c7nr09410h Aaron D. Mueller 1, 2, 3 , Landobasa Y. M. Tobing 1, 2, 3 , Dao Hua Zhang 1, 2, 3
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-07 00:00:00 , DOI: 10.1039/c7nr09410h Aaron D. Mueller 1, 2, 3 , Landobasa Y. M. Tobing 1, 2, 3 , Dao Hua Zhang 1, 2, 3
Affiliation
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Strong interactions between localized surface plasmons and nanoscale objects have led to the development of highly sensitive biochemical sensing in planar metallic nanostructures with sensing performance mainly dependent on the interaction volume and the local electric field. However, the sensitivity and the interaction volume of these planar structures have been limited by the achievable aspect ratios based on the standard lift-off process. We propose a new technique which involves cold sonicated development and pulsed electrodeposition to overcome this limitation, and demonstrate robust gold square dimers with sub-10 nm gaps and a gap aspect ratio of ∼8. We show that smooth gold surfaces can be achieved by growing the gold film directly on a transparent ITO substrate without a gold seed layer, and demonstrate a significant improvement in Q factors and resonance contrast in electrodeposited dimers compared to dimers fabricated by physical vapor deposition. We demonstrate that the electrodeposited dimers exhibit near 50% higher bulk refractive index sensitivity than their planar counterparts. The technique may be used to grow a variety of metals of arbitrary geometries and spatial arrangements.
中文翻译：
将超声冷显影和脉冲电沉积相结合以形成高纵横比低于10 nm的间隙金二聚体，用于可见光谱中的传感应用†
局部表面等离子体激元与纳米尺度物体之间的强相互作用导致平面金属纳米结构中高度灵敏的生物化学传感的发展，其传感性能主要取决于相互作用体积和局部电场。然而，这些平面结构的灵敏度和相互作用体积已经受到基于标准剥离工艺的可达到的纵横比的限制。我们提出了一种新技术，该技术涉及冷超声处理和脉冲电沉积来克服这一局限性，并展示了具有小于10 nm的间隙和约8的间隙长宽比的稳健的金方二聚体。我们表明，可以通过在不具有金晶种层的透明ITO衬底上直接生长金膜来获得光滑的金表面，并证明该工艺具有显着的改善与物理气相沉积制备的二聚体相比，电沉积二聚体的Q因子和共振对比度。我们证明，电沉积的二聚体比其平面对应物具有更高的近50％的整体折射率灵敏度。该技术可用于生长具有任意几何形状和空间排列的各种金属。
更新日期：2018-02-07
中文翻译：
将超声冷显影和脉冲电沉积相结合以形成高纵横比低于10 nm的间隙金二聚体，用于可见光谱中的传感应用†
局部表面等离子体激元与纳米尺度物体之间的强相互作用导致平面金属纳米结构中高度灵敏的生物化学传感的发展，其传感性能主要取决于相互作用体积和局部电场。然而，这些平面结构的灵敏度和相互作用体积已经受到基于标准剥离工艺的可达到的纵横比的限制。我们提出了一种新技术，该技术涉及冷超声处理和脉冲电沉积来克服这一局限性，并展示了具有小于10 nm的间隙和约8的间隙长宽比的稳健的金方二聚体。我们表明，可以通过在不具有金晶种层的透明ITO衬底上直接生长金膜来获得光滑的金表面，并证明该工艺具有显着的改善与物理气相沉积制备的二聚体相比，电沉积二聚体的Q因子和共振对比度。我们证明，电沉积的二聚体比其平面对应物具有更高的近50％的整体折射率灵敏度。该技术可用于生长具有任意几何形状和空间排列的各种金属。
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