Optical Quantification of Metal Ions Using Plasmonic Nanostructured Microbeads Coated with Metal-Organic Frameworks and Ion-Selective Dyes

Tolga Zorlu; Begoña Puértolas; I Brian Becerril-Castro; Luca Guerrini; Vincenzo Giannini; Miguel A Correa-Duarte; Ramon A Alvarez-Puebla

doi:10.1021/acsnanoscienceau.2c00063

Optical Quantification of Metal Ions Using Plasmonic Nanostructured Microbeads Coated with Metal-Organic Frameworks and Ion-Selective Dyes

ACS Nanosci Au. 2023 Mar 6;3(3):222-229. doi: 10.1021/acsnanoscienceau.2c00063. eCollection 2023 Jun 21.

Authors

Tolga Zorlu^{1

2}, Begoña Puértolas², I Brian Becerril-Castro¹, Luca Guerrini¹, Vincenzo Giannini^{3

4}, Miguel A Correa-Duarte², Ramon A Alvarez-Puebla^{1

5}

Affiliations

¹ Department of Physical and Inorganic Chemistry, Universitat Rovira i Virgili, Carrer de Marcel·lí Domingo s/n, 43007 Tarragona, Spain.
² Department of Physical Chemistry, Center for Biomedical Research (CINBIO), Southern Galicia Institute of Health Research (IISGS) and Biomedical Research Networking Center for Mental Health (CIBERSAM), Universidade de Vigo, 36310 Vigo, Spain.
³ Technology Innovation Institute, Masdar City, 9639 Abu Dhabi, United Arab Emirates.
⁴ Centre of Excellence ENSEMBLE3 sp. z o.o., Wolczynska 133, 01-919 Warsaw, Poland.
⁵ ICREA, Passeig Lluís Companys 23, 08010 Barcelona, Spain.

Abstract

Herein, we designed and synthesized a hybrid material comprising polystyrene submicrobeads coated with silver nanospheres. This material provides a dense collection of electromagnetic hot spots upon illumination with visible light. The subsequent coating with a metal-framework and the adsorption of bathocuproine on it yield an optical sensor for SERS that can specifically detect Cu(II) in a variety of aqueous samples at the ultratrace level. Detection limits with this method are superior to those of induced coupled plasma or atomic absorption and comparable with those obtained with induced coupled plasma coupled with a mass detector.