title: Combination of surface- and interference-enhanced Raman scattering by CuS nanocrystals on nanopatterned Au structures.
abstract: We present the results of a Raman study of optical phonons in CuS nanocrystals (NCs) with a low areal density fabricated through the Langmuir-Blodgett technology on nanopatterned Au nanocluster arrays using a combination of surface- and interference-enhanced Raman scattering (SERS and IERS, respectively). Micro-Raman spectra of one monolayer of CuS NCs deposited on a bare Si substrate reveal only features corresponding to crystalline Si. However, a new relatively strong peak occurs in the Raman spectrum of CuS NCs on Au nanocluster arrays at 474 cm(-1). This feature is related to the optical phonon mode in CuS NCs and manifests the SERS effect. For CuS NCs deposited on a SiO2 layer this phonon mode is also observed due to the IERS effect. Its intensity changes periodically with increasing SiO2 layer thickness for different laser excitation lines and is enhanced by a factor of about 30. CuS NCs formed on Au nanocluster arrays fabricated on IERS substrates combine the advantages of SERS and IERS and demonstrate stronger SERS enhancement allowing for the observation of Raman signals from CuS NCs with an ultra-low areal density.
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia ; Novosibirsk State University, Pirogov str. 2, Novosibirsk 630090, Russia.
authors.forename: Alexander G
authors.initials: AG
authors.lastname: Milekhin
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia ; Novosibirsk State University, Pirogov str. 2, Novosibirsk 630090, Russia.
authors.forename: Nikolay A
authors.initials: NA
authors.lastname: Yeryukov
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia.
authors.forename: Larisa L
authors.initials: LL
authors.lastname: Sveshnikova
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia.
authors.forename: Tatyana A
authors.initials: TA
authors.lastname: Duda
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia ; Novosibirsk State University, Pirogov str. 2, Novosibirsk 630090, Russia.
authors.forename: Ekaterina E
authors.initials: EE
authors.lastname: Rodyakina
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia ; Novosibirsk State Technical University, pr. Karl Marx, 20, Novosibirsk, 630092, Russia.
authors.forename: Victor A
authors.initials: VA
authors.lastname: Gridchin
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia ; Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany.
authors.forename: Evgeniya S
authors.initials: ES
authors.lastname: Sheremet
authors.affiliation: A. V. Rzhanov Institute of Semiconductor Physics, pr. Lavrentieva, 13, Novosibirsk 630090, Russia ; Semiconductor Physics, Technische Universität Chemnitz, D-09107 Chemnitz, Germany.
authors.forename: Dietrich R T
authors.initials: DR
authors.lastname: Zahn
keywords: copper sulfide (CuS) nanocrystals; interference-enhanced Raman spectroscopy; phonons; surface-enhanced Raman spectroscopy