Papers by Keyword: Cluster Beam Deposition

Abstract: Substoichiometric germanium oxide nanoparticles were synthesized through gas aggregation process with a careful control on the size, composition and crystallinity of the nanoparticles. The nanoparticles show broad room temperature photoluminescence (PL) in the 470nm to 600nm wavelength region. The microstructure and optical properties of the nanoparticles were investigated. We found that the photoluminescence behavior of the nanoparticles is critically influenced by their compositions. Through temperature-dependent photoluminescence and time-resolved photoluminescence spectroscopy, we concluded that the broad PL band originated from the defects in the GeOx shell layers, rather than the quantum-confinement effect.

Abstract: We report on a simple method for the fabrication of metalized tips by depositing gas-phase synthesized silver nanoparticles onto atomic force microscope (AFM) tips. The method enables fabricating tips suitable for AFM based tip-enhanced Raman spectroscopy (TERS) with high yield. The performance of the fabricated silver nanoparticle decorated tips is examined by detecting low concentration BPE molecules using a transmission mode TERS setup. An 30-fold enhancement of the Raman signal is shown. The net TERS enhancement factor is calculated to be about 1000.