论文期刊

Etching-dependent uorescence quenching of Ag-dielectric-Au fl three-layered nanoshells: The effect of inner Ag nanosphere




作者: Jian Zhu, Zai-jie Xu, Guo-jun Weng, Jing Zhao, Jian-jun Li, Jun-wu Zhao ⁎
发表/完成日期: 2018-04-10
期刊名称: Spectrochimica Acta Part A
期卷: 200 (2018)
相关文章:
论文简介
In this report,Ag-dielectric-Au three-layered nanoshells with controlled inner core size were synthesized.The
fluorescence emissionofthe rhodamine 6G(R6G) could be quenched bythe three-layered nanoshells distinctly.
What's more,the uorescence quenchingef fl ficiencycould be further improved by tuningthe etchingofinner Ag
nanosphere. The maximum uorescence quenchingef ciency is obtained when the separate layer just appears fl fi
between the inner Ag core and the outer Au shell. Whereas the uorescence quenching ef ciency is weakened fl fi
when no gaps take place around the inner Ag core or the separate layer is too thick and greater than 13 nm.
The uorescence quenching properties of the Ag-dielectric-Au three-layered nanoshells with different initial fl
sizes of the Ag nanoparticles are also studied. The maximum uorescence quenching ef ciency is obtained fl fi
when the three-layered nanoshells are synthesized based on the Ag nanoparticles with 60 nm, which is better
thanothers two sizes (42and 79 nm).Thus we believe that the size ofinitialAgnanospheres also greatlyaffects
the optimized uorescence quenchingef ciency. These results about uorescence quenching properties of Ag- fl fi fl
dielectric-Authree-layered nanoshells presentapotentialfor designand fabricationof uorescence nanosensors fl
based on tuningthe geometry of the inner core and the separate layer.
© 2018 Published by Elsevier B.V.