title: Charge-selective Raman scattering and fluorescence quenching by "nanometal on semiconductor" substrates.
abstract: Ag nanoparticles synthesized on n and p-type Si were shown to exhibit charge-selective surface-enhanced Raman scattering and fluorescence quenching. As revealed by electric force microscopy, the polarity and magnitude of the nanoparticle charge is controllable with the metal-semiconductor Fermi level difference and nanoparticle size. It is inferred that the Fermi level alignment is dominantly contributed by the charge-induced nanoparticle voltage. Nanoparticle charging also accounts for self-inhibition of coalescence during chemical reduction, allowing strong plasmon hybridization.
authors.affiliation: School of Mechanical and Aerospace Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
authors.forename: Karthik
authors.initials: K
authors.lastname: Bhatt
authors.forename: Susheng
authors.initials: S
authors.lastname: Tan
authors.forename: Sriharsha
authors.initials: S
authors.lastname: Karumuri
authors.forename: A Kaan
authors.initials: AK
authors.lastname: Kalkan