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Trigonal Silver Nanostructure for Single Molecule Detection with Surface Enhanced Raman Scattering
Y. Yamaguchi,M. Futamata,M. Ishikawa,Y. Maruyama 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
Silver nanostructure was fabricated by means of nanosphere lithography developed by Van Duyne et al. The nanostructure is composed of a two-dimensional (2-D) array of trigonal prisms that could form an enormous electric field at their sharp edges under localized surface plasmon resonances to provide single molecule sensitivity. In fact, it yielded the blinking of a SERS signal from adsorbed rhodamine 6G, which is an abrupt and repeated intensity fluctuation with time and has been attributed to a single molecule phenomenon. The blinking occurred on the trigonal metal nanostructure approximately 20 times as efficiently as on continuous silver films prepared with the same evaporation condition as for the trigonal structure. Accordingly, the trigonal silver nanostructure is quite promising to give single molecule sensitivity in SERS.