Quantum Dots as CdSe, CdS, and CdSe are commonly obtained by colloidal synthetic methods in organic or aqueous media.1 The organic medium method was first described in literature.2 The aqueous methodology was described later in order to reduce synthetic steps and toxicity.3 An electrochemical method for reducing elemental Te in an alkaline medium, without using chemical reducing agents was also reported.4 The silica is an inorganic polymer having silanol groups on its surface, which allow the reaction with silylating agents that act as a bridge between the silica and the adsorbed compound. Silica is often quoted in the literature for its ability to adsorb solids, liquids and vapors, among other characteristics.5 With the aim of developing a method for QDs anchoring, the silica surface was modified with the silylating agent N-β-aminoethyl-γ-aminopropyl-trimethoxysilane, and characterized by elemental analysis (C = 16.16%, N = 5.20 and H = 4.71) showing the presence of organic matter on the surface of silica even after washing processes with different solvents. From the infrared spectrum it was possible to observe O-H silanol group at 3434 cm-1, the C-H of the N-β-aminoethyl-γ-aminopropyl-trimethoxysilane at 2985-2840 cm-1, C-C at 1622 cm-1, C-H at 1487 cm-1 and the stretching siloxanes Si-O-Si at 1095 cm-1, indicating the presence of the silylating agent on the silica surface. Quantum dots solution, prepared via electrochemical method in an aqueous medium,4 was heated to temporal tracking (collecting aliquots), which were adsorbed on silica silylating agent modified by N-β-aminoethyl-γ-aminopropyl trimethoxysilane, resulting a luminescent silica material at different colors. After anchoring, these silicas were characterized by the emission spectrum, showing that the greatest intensity of luminescence occurred at the QD silica heated for 60 minutes. Characterization was also carried out by XRD analysis. References 1. Mansur, H. S., Nanomed. Nanobiotechnol. 2010, 2, 113. 2. C. Murray, D. Norris, M. Bawendi, J. Am. Chem. Soc., 1993, 115, 8706. 3. Rogach, A. L.; Franzl, T.; Klar, T. A.; Feldmann, J.; Gaponik, N.; Lesnyak, V.; Shavel, A.; Eychmüller, A.; Rakovich, Y. P.; Donegan, J. F.; J. Phys. Chem. C, 2007, 111, 14628. 4. Ribeiro, R. T.; Dias, J. M. M.; Pereira, G. A.; Freitas, D. V.; Monteiro, M.; Cabral Filho, P. E.; Raele, R. A.; Fontes, A.; Navarro, M.; Santos, B. S., Green Chem. 2013, 15, 1061. 5. FARIAS, R. F.; Airoldi, C.; Química Nova, 2000, 23, 1.

Preparation of CdTe quantum dots supported on modified silica gel

251st National Meeting (2016)

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