Author, as appears in the article.: Aguilar-Pujol M; Ramírez-Jiménez R; Xifre-Perez E; Cortijo-Campos S; Bartolomé J; Marsal LF; Andrés Ad

Department: Enginyeria Electrònica, Elèctrica i Automàtica

URV's Author/s: Marsal Garví, Luis Francisco / Xifré Pérez, Elisabet

Keywords: Surface Sers Sem Optical simulations Nanoparticles Interference Graphene Enhanced raman scattering Alumina membrane Afm sem nanoparticles interference graphene enhanced raman scattering alumina membrane afm

Abstract: © 2020 by the authors. Licensee MDPI, Basel, Switzerland. T. The detection of Raman signals from diluted molecules or biomaterials in complex media is still a challenge. Besides the widely studied Raman enhancement by nanoparticle plasmons, interference mechanisms provide an interesting option. A novel approach for amplification platforms based on supported thin alumina membranes was designed and fabricated to optimize the interference processes. The dielectric layer is the extremely thin alumina membrane itself and, its metallic aluminum support, the reflecting medium. A CVD (chemical vapor deposition) singlelayer graphene is transferred on the membrane to serve as substrate to deposit the analyte. Experimental results and simulations of the interference processes were employed to determine the relevant parameters of the structure to optimize the Raman enhancement factor (E.F.). Highly homogeneous E.F. over the platform surface are obtained, typically 370 ± (5%), for membranes with ~100 nm pore depth, ~18 nm pore diameter and the complete elimination of the Al2O3 bottom barrier layer. The combined surface enhanced Raman scattering (SERS) and interference amplification is also demonstrated by depositing ultra-small silver nanoparticles. This new approach to amplify the Raman signal of analytes is easily obtained, low-cost and robust with useful enhancement factors (~400) and allows only interference or combined enhancement mechanisms, depending on the analyte requirements.

Thematic Areas: Physics, applied Nanoscience & nanotechnology Materials science, multidisciplinary Materials science (miscellaneous) Materials science (all) General materials science General chemical engineering Engenharias ii Chemistry, multidisciplinary Chemical engineering (miscellaneous) Chemical engineering (all)

licence for use: https://creativecommons.org/licenses/by/3.0/es/

ISSN: 2079-4991

Author's mail: lluis.marsal@urv.cat elisabet.xifre@urv.cat

Author identifier: 0000-0002-5976-1408 0000-0001-6072-9889

Record's date: 2023-02-19

Journal volume: 10

Papper version: info:eu-repo/semantics/publishedVersion

Link to the original source: https://www.mdpi.com/2079-4991/10/5/830

Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/

Papper original source: Nanomaterials. 10 (5):

APA: Aguilar-Pujol M; Ramírez-Jiménez R; Xifre-Perez E; Cortijo-Campos S; Bartolomé J; Marsal LF; Andrés Ad (2020). Supported ultra-thin alumina membranes with graphene as efficient interference enhanced raman scattering platforms for sensing. Nanomaterials, 10(5), -. DOI: 10.3390/nano10050830

Article's DOI: 10.3390/nano10050830

Entity: Universitat Rovira i Virgili

Journal publication year: 2020

Publication Type: Journal Publications