Báo cáo hóa học: "Surface Plasmon Resonance from Bimetallic Interface in Au–Ag Core–Shell Structure Nanowires"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Surface Plasmon Resonance from Bimetallic Interface in Au–Ag Core–Shell Structure Nanowires | Nanoscale Res Lett 2009 4 977-981 DOI s11671-009-9344-4 NANO EXPRESS Surface Plasmon Resonance from Bimetallic Interface in Au-Ag Core-Shell Structure Nanowires Jian Zhu Received 13 October 2008 Accepted 6 May 2009 Published online 21 May 2009 to the authors 2009 Abstract 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. Keywords Surface plasmon resonance SPR Interface Bimetallic Core-shell structure Nanowires Introduction The optical properties of bimetallic Au-Ag nanoparticles are currently of considerable interest and the subject of a significant literature due to the potential uses of the tunable light absorption scattering and local field enhancement in the UV-visible region 1 2 . There are two types of J. Zhu H Non-Equilibrium Condensed Matter and Quantum Engineering Laboratory The Key Laboratory of Ministry of Education School of Science Xi an Jiaotong University Xi an 710049 China e-mail jianzhusummer@ bimetallic nanoparticles alloy particles particles with a homogeneous distribution of two kinds of metals and core-shell structure particles particles with heterogeneous arrangement of two kinds of metals leading to core-shell .

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