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Bordonal, A. C. “ Hybrid Materials Based on Layered Compounds and Active Redox Molecules”. 131 p. Tese de DoutoradoPrograma de Pós-Graduação em Química, Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto, 2016. Layered Double Hydroxides (LDH) constitute a class of materials with a layered structure consisting of positively charged layers of a double hydroxide and hydrated anions intercalated in the interlayer domain. These materials have received much attention lately because they offer many advantages: they display acidic and basic properties, “memory effect”, and high surface area; are inexpensive and easy to prepare; and can combine with a variety of cations and anions. Combination of LDH with materials like graphene oxide affords composites with improved properties as compared to the starting organic component. Heat treatment of LDH intercalated with a monomer such as 4-vinyl-benzene sulfonate (VBS), followed by “in situ” polymerization and carbonization, produces composites and/or carbon replica. The materials described above could be applied as support to immobilize enzymes and may provide an alternative platform for biosensor devices. In this study, we aimed to prepare and characterize LDH, composites and/or carbon replica derived from LDH, and LDH/graphene oxide composites and support glucose oxidase enzyme (GOx) on these matrixes. We investigated the electrochemical properties of the resulting materials and evaluated their potential application as biosensors. More specifically, we prepared and characterized Mg-Al and Zn-Al LDH systems intercalated with carbonate ion by the coprecipitation method; composites and/or carbon replica derived from a precursor LDH Mg-Al-VBS by coprecipitation at constant pH; and Mg-Al/graphene composites by coprecipitation at constant pH. We used these materials to immobilize GOx on modified electrodes and assessed the electrochemical activity and potential application of the immobilized enzyme as biosensor. Mg-Al-CO3, Zn-Al-CO3, Mg-Al-VBS LDH and Mg-Al/graphene oxide composite were crystalline, thermally stable, and porous and exhibited positively charged surface, which favored immobilization and electrochemical investigation of the GOx enzyme. The modified electrodes displayed good catalytic response to glucose, as substrate, and improved the activity of the enzyme as compared to GOx alone. Additionally, the modified electrodes were sensitive, stable, and reproducible, paving the way for their use in the design of biosensors.

Materiais híbridos baseados em compostos lamelares e moléculas redox ativas