title: Immobilization of Distinctly Capped CdTe Quantum Dots onto Porous Aminated Solid Supports.
abstract: Immobilization of quantum dots (QDs) onto solid supports could improve their applicability in the development of sensing platforms and solid-phase reactors by allowing the implementation of reusable surfaces and the execution of repetitive procedures. As the reactivity of QDs relies mostly on their surface chemistry, immobilization could also limit the disruption of solution stability that could prevent stable measurements. Herein, distinct strategies to immobilize QDs onto porous aminated supports, such as physical adsorption and the establishment of chemical linking, were evaluated. This work explores the influence of QD capping and size, concentration, pH, and contact time between the support and the QDs. Maximum QD retention was obtained for physical adsorption assays. Freundlich and Langmuir isotherms were used to analyze the equilibrium data. Gibbs free energy, enthalpy, and entropy were calculated and the stability of immobilized QDs was confirmed.
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal).
authors.forename: S Sofia M
authors.initials: SS
authors.lastname: Rodrigues
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal).
authors.forename: David S M
authors.initials: DS
authors.lastname: Ribeiro
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal).
authors.forename: Christian
authors.initials: C
authors.lastname: Frigerio
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal).
authors.forename: Susana P F
authors.initials: SP
authors.lastname: Costa
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal).
authors.forename: João A V
authors.initials: JA
authors.lastname: Prior
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal).
authors.forename: Paula C A G
authors.initials: PC
authors.lastname: Pinto
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal). joaolms@ff.up.pt.
authors.forename: João L M
authors.initials: JL
authors.lastname: Santos
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal). lsaraiva@ff.up.pt.
authors.forename: M Lúcia M F S
authors.initials: ML
authors.lastname: Saraiva
authors.affiliation: LAQV, REQUIMTE, Department of Chemical Sciences, Laboratory of Applied Chemistry, Faculty of Pharmacy, Porto University, Rua de Jorge Viterbo Ferreira, 228, 4050-313 Porto (Portugal). marietapassos@gmail.com.
authors.forename: Marieta L C
authors.initials: ML
authors.lastname: Passos
keywords: covalent linking; kinetics; physical adsorption; quantum dots; thermodynamics