Highly Ordered 3D-Silver Nanoring Arrays (3D-AgNRAs) for Refractometric Sensing.
writer：Xueyao Liu, Wendong Liu, and Bai Yang.
keywords：none
source：期刊
specific source：J. Mater. Chem. C
Issue time：2019年
The optical performance of two dimensional (2D) metallic nanoring arrays is inevitably a?ected by their
substrate. This problem can be solved by using three dimensional (3D) nanorings, whose height is larger.
However, most reported 3D-metallic nanoring arrays were prepared through focused ion beam
lithography, which is high cost and low e?ciency. Herein, we provided a new approach to fabricate
highly ordered 3D-silver nanoring arrays (3D-AgNRAs) over a large area through multistep colloidal
lithography combined with metal deposition. The specific structure of the 3D-AgNRAs could be facilely
tuned by modulating the etching conditions. After gradual optimization of the 3D-AgNRAs’ structural
parameters with respect to their optical and sensing performance, the optimized 3D-AgNRAs’ structural
features were finally settled to be 1 mm period, 200 nm nanoring height, 300 nm silver layer thickness,
830 nm outer diameter, and 428 nm inner diameter. The optimized 3D-AgNRAs achieved high
refractometric sensitivity of 1105.8 nm per RIU and relative sensitivity of 50.2% per RIU. Ultimately, the
optimized 3D-AgNRAs were employed as an immunoassay substrate to prove their label-free biosensing
potential in the future.