title: Surface-enhanced Raman scattering for 2-D WSe2hybridized with functionalized gold nanoparticles.
abstract: Two-dimensional (2-D) transition metal dichalcogenides, such as MoS2, WSe2, and WS2, are promising materials for application in field effect transistors, optoelectronics, and sensing devices. In this study, 2-D WSe2samples with various numbers of layers were hybridized with functionalized gold nanoparticles (Au-NPs) to achieve surface-enhanced Raman scattering (SERS). The nanoscale Raman and photoluminescence spectra of the WSe2layers and WSe2/Au-NP hybrids were measured using a high-resolution laser confocal microscope. The WSe2exhibited distinct optical characteristics depending on the number of WSe2layers. The intensities of the Raman characteristic modes of the WSe2layers were significantly enhanced after hybridization with functionalized Au-NPs, indicating the SERS effect. The SERS effect weakened with increasing the number of WSe2layers. The SERS effect was more pronounced for mono- and bi-layer WSe2systems compared with the multi-layer WSe2systems.
authors.forename: Jun Young
authors.initials: JY
authors.lastname: Kim
authors.forename: Jeongyong
authors.initials: J
authors.lastname: Kim
authors.forename: Jinsoo
authors.initials: J
authors.lastname: Joo