Verma Mrigank Singh, Chandra Manabendra
Department of Chemistry, Indian Institute of Technology, Kanpur, Uttar Pradesh, 208016, India.
Phys Chem Chem Phys. 2021 Nov 24;23(45):25565-25571. doi: 10.1039/d1cp04546f.
Here, we demonstrate the utility of the second harmonic generation (SHG) for refractometric sensing in the solution phase. We employ an aqueous colloid of gold nanorods as our sensors, and modulation in their SHG with the surrounding refractive index (RI) is mirrored using second-harmonic light scattering (SHLS). A limit of detection (LOD) as low as 9 × 10 RIU is achieved. The RI sensitivity of our SHLS-based approach is two orders of magnitude higher than that obtained using linear Rayleigh scattering. Most importantly, we show that the particle size plays a crucial role in controlling the nonlinear plasmonic sensing performance of gold nanorods.
在此，我们展示了二次谐波产生（SHG）在溶液相中用于折射传感的实用性。我们使用金纳米棒的水性胶体作为传感器，并利用二次谐波光散射（SHLS）来反映其SHG随周围折射率（RI）的调制情况。实现了低至9×10 -6 RIU的检测限。我们基于SHLS的方法的RI灵敏度比使用线性瑞利散射获得的灵敏度高两个数量级。最重要的是，我们表明粒径在控制金纳米棒的非线性等离子体传感性能方面起着关键作用。
