Controllable Preparation of Core–Shell Au–Ag Nanoshuttles with Improved Refractive Index Sensitivity and SERS Activity

2014 ◽  
Vol 6 (5) ◽  
pp. 3331-3340 ◽  
Author(s):  
Tingting Bai ◽  
Jianfei Sun ◽  
Renchao Che ◽  
Lina Xu ◽  
Chenyue Yin ◽  
...  
RSC Advances ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 1700-1705 ◽  
Author(s):  
Hailong Zhang ◽  
Pengfei Cao ◽  
Jie Dou ◽  
Lin Cheng ◽  
Tiaoming Niu ◽  
...  

We present a new type of localized surface plasmon resonance (LSPR) sensor whose refractive index sensitivity can be improved by greatly increasing the plasmon wavelength red-shift of metal–semiconductor core–shell nanoparticles (CSNs).


RSC Advances ◽  
2018 ◽  
Vol 8 (61) ◽  
pp. 35005-35013 ◽  
Author(s):  
Pengfei Cao ◽  
Huizhen Chen ◽  
Hailong Zhang ◽  
Lin Cheng ◽  
Tiaoming Niu

A high refractive index sensitivity of Au@Cu2−xS core–shell nanorods working in the near-infrared is theoretically demonstrated.


2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Anthony Lim ◽  
Wen Bin Ji ◽  
Swee Chuan Tjin

A new structure of Long-Period Gratings (LPGs) sensor is introduced as a sensitive ambient RI sensor. This structure consists of creating periodic corrugations on the cladding of the LPG. The experimental results show that this LPG structure has good performances in terms of linearity and sensitivity and serves as a highly sensitive and cost-effective sensor. It also has the advantage of portability as the corrugation can also serve as the reservoir for the specimen collection to be tested.


2021 ◽  
Author(s):  
Jianjun LI ◽  
Qiu-Xiang Qin ◽  
Guo-Jun Weng ◽  
Jian Zhu ◽  
Jun-Wu Zhao

Abstract In this study, the nanoboxes is converted into Au-Ag alloy nanocages by increasing the hole size. Discrete dipole approximation (DDA) is used to study the extinction spectrum and the refractive index sensing characteristics of Au-Ag alloy nanocages with different geometric parameters. With the increase of Au component, the local surface plasmon resonance (LSPR) peak shows approximately linear redshift and the sensitivity factor shows approximately linear decrease. The refractive index sensitivity can be effectively controlled by the Au-Ag ratio at large hole size because the hole and cavity surfaces distribute more environmental dielectric components. Therefore, increasing the hole size and decreasing the Au-Ag ratio can improve the refractive index sensitivity. To explain the effect of alloy composition on the LSPR characteristics and the refractive index sensitivity, the local electric field distributions with different geometric parameters are plotted. We find that the electric field direction on the hole and cavity surfaces are controlled by the Au-Ag ratio and environmental dielectric constant. Moreover, the field vector on the hole and cavity surfaces are formed by the superposition of the incident field, the electric field generated by the oscillating electrons on the outer surface, and the polarized field in the environmental dielectric constant.


2013 ◽  
Vol 210 (10) ◽  
pp. 2100-2105 ◽  
Author(s):  
Mateusz Śmietana ◽  
Mariusz Dudek ◽  
Marcin Koba ◽  
Bartosz Michalak

2004 ◽  
Vol 229 (1-6) ◽  
pp. 65-69 ◽  
Author(s):  
Joo Hin Chong ◽  
Ping Shum ◽  
H Haryono ◽  
A Yohana ◽  
M.K Rao ◽  
...  

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