A turn-on fluorescent solid-sensor for Hg(II) detection

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 silic...

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Bibliographic Details
Authors: De la Cruz Guzmán, Mayela, Aguilar Aguilar, Angelica, Hernandez Adame, Luis, Bañuelos Frías, Alan, Medellin Rodriguez, Francisco J, Palestino, Gabriela
Format: article
Status:Published version
Publication Date:2014
Country:México
Institution:Universidad Autónoma de Zacatecas
Repository:Repositorio Institucional Caxcán
Language:English
OAI Identifier:oai:http://ricaxcan.uaz.edu.mx:20.500.11845/1673
Online Access:http://ricaxcan.uaz.edu.mx/jspui/handle/20.500.11845/1673
Access Level:Open access
Keyword:INGENIERIA Y TECNOLOGIA [7]
Chemosensor
Porous silicon
Rhodamine derivative
Fluorescence
Heavy metal
Description
Summary: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 Hg2+ detection was investigated by fluorescent spectroscopy and microscopy. Upon the addition of increasing amounts of Hg2+ 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 Hg2+ 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 Hg2+ detection.

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