Nano Express

Nanoscale Research Letters

, Volume 4, Issue 9, pp 977-981

First online:

Open Access This content is freely available online to anyone, anywhere at any time.

Surface Plasmon Resonance from Bimetallic Interface in Au–Ag Core–Shell Structure Nanowires

  • Jian ZhuAffiliated withNon-Equilibrium Condensed Matter and Quantum Engineering Laboratory, The Key Laboratory of Ministry of Education, School of Science, Xi’an Jiaotong University Email author 


Transverse surface plasmon resonances (SPR) in Au–Ag and Ag–Au core–shell structure nanowires have been investigated by means of quasi-static theory. There are two kinds of SPR bands resulting from the outer surface of wall metal and the interface between core and wall metals, respectively. The SPR corresponding to the interface, which is similar to that of alloy particle, decreases and shifts obviously with increasing the wall thickness. However, the SPR corresponding to the outer surface, which is similar to that of pure metal particle, increases and shifts slightly with increasing the wall thickness. A mechanism based on oscillatory surface electrons under coulombic attraction is developed to illuminate the shift fashion of SPR from bimetallic core–shell interface. The net charges and extra coulombic force in metallic wall affect the SPR energy and the shift fashion.


Surface plasmon resonance (SPR) Interface Bimetallic Core–shell structure Nanowires