In Situ Synthesis of SERS-Active Au@POM Nanostructures in a Microfluidic Device for Real-Time Detection of Water Pollutants

Lafuente, M. (Universidad de Zaragoza) ; Pellejero, I. ; Clemente, A. ; Urbiztondo, M.A. ; Mallada, R. (Universidad de Zaragoza) ; Reinoso, S. ; Pina, M.P. (Universidad de Zaragoza) ; Gandía, L.M.

Resumen: We present a simple, versatile, and low-cost approach for the preparation of surface-enhanced Raman spectroscopy (SERS)-active regions within a microfluidic channel 50 cm in length. The approach involves the UV-light-driven formation of polyoxometalate-decorated gold nanostructures, Au@POM (POM: H3PW12O40 (PW) and H3PMo12O40 (PMo)), that self-assemble in situ on the surface of the polydimethylsiloxane (PDMS) microchannels without any extra functionalization procedure. The fabricated LoCs were characterized by scanning electron microscopy (SEM), UV-vis, Raman, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) techniques. The SERS activity of the resulting Au@POM-coated lab-on-a-chip (LoC) devices was evaluated in both static and flow conditions using rhodamine R6G. The SERS response of Au@PW-based LoCs was found to be superior to Au@PMo counterparts and outstanding when compared to reported data on metal@POM nanocomposites. We demonstrate the potentialities of both Au@POM-coated LoCs as analytical platforms for real-time detection of the organophosphorous pesticide paraoxon-methyl at 10-6 M concentration level.

Idioma: Inglés

DOI: 10.1021/acsami.0c06725

Año: 2020

Publicado en: ACS Applied Materials and Interfaces 12, 32 (2020), 36458-36467
ISSN: 1944-8244

Factor impacto JCR: 9.229 (2020)

Categ. JCR: NANOSCIENCE & NANOTECHNOLOGY rank: 21 / 106 = 0.198 (2020) - Q1 - T1
Categ. JCR: MATERIALS SCIENCE, MULTIDISCIPLINARY rank: 44 / 333 = 0.132 (2020) - Q1 - T1

Factor impacto SCIMAGO: 2.535 - Materials Science (miscellaneous) (Q1) - Nanoscience and Nanotechnology (Q1) - Medicine (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/ES/MINECO/CTQ2016-79419-R

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Ingeniería Química (Dpto. Ing.Quím.Tecnol.Med.Amb.)