title: A turn-on fluorescent solid-sensor for Hg(II) detection.
abstract: A rhodamine organosilane derivative (Rh-UTES) has been obtained by one-pot synthesis. The chemical structure of Rh-UTES was confirmed by nuclear magnetic resonance (NMR) and infrared (FTIR) techniques. To obtain an inorganic-organic hybrid sensor, Rh-UTES was covalently immobilized on a porous silicon microcavity (PSiMc) via triethoxysilane groups. The attachment of the organic derivative into PSiMc was confirmed by FTIR, specular reflectance, and scanning electron microscopy (SEM). The optical performance of Rh-UTES receptor for Hg(2+) detection was investigated by fluorescent spectroscopy and microscopy. Upon the addition of increasing amounts of Hg(2+) ions, a remarkable enhancement in emission intensity was produced in both systems. In the solid phase, an increase of integrated fluorescent emission of 0.12- and 0.15-fold after Hg(2+) receptor coordination was observed. The light harvesting capability of PSiMc devices allowed obtaining an enhanced fluorescent emission after Rh-UTES immobilization (277-fold). The fluorescence microscopy of hybrid PSiMc sensor provided an optical qualitative test for Hg(2+) detection.
authors.affiliation: Biopolymers and Nanostructures Laboratory, Faculty of Chemical Sciences, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 6, San Luis Potosí, San Luis Potosí 78210, México.
authors.forename: Mayela
authors.initials: M
authors.lastname: De la Cruz-Guzman
authors.affiliation: Biopolymers and Nanostructures Laboratory, Faculty of Chemical Sciences, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 6, San Luis Potosí, San Luis Potosí 78210, México.
authors.forename: Angelica
authors.initials: A
authors.lastname: Aguilar-Aguilar
authors.affiliation: Biopolymers and Nanostructures Laboratory, Faculty of Chemical Sciences, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 6, San Luis Potosí, San Luis Potosí 78210, México.
authors.forename: Luis
authors.initials: L
authors.lastname: Hernandez-Adame
authors.affiliation: Colloids and Interfaces Laboratory, Institute of Physics, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 6, San Luis Potosí, San Luis Potosí 78210, México.
authors.forename: Alan
authors.initials: A
authors.lastname: Bañuelos-Frias
authors.affiliation: Materials Laboratory, Faculty of Chemical Sciences, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 6, San Luis Potosí, San Luis Potosí 78210, México.
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Medellín-Rodríguez
authors.affiliation: Biopolymers and Nanostructures Laboratory, Faculty of Chemical Sciences, Universidad Autónoma de San Luis Potosí, Av. Manuel Nava No. 6, San Luis Potosí, San Luis Potosí 78210, México.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Palestino
keywords: Chemosensor; Fluorescence; Heavy metal; Porous silicon; Rhodamine derivative