Sensors & Catalysts
1) SERS sensors
The Surface Enhanced Raman Effect (SERS) made Raman spectroscopy, which was a low sensitivity spectroscopic technique, one of the most sensitive analysis methods, being the only one capable of reaching the detection limit of just one molecule and giving the impression digital chemistry of the molecule on the surface of nanomaterials simultaneously. Consequently, the SERS effect has become one of the most researched subjects, mainly in analytical chemistry, for the development of sensors for a variety of molecular species, from biomolecules, pesticides to heavy metals. The group has been active in the development of hybrid materials consisting of two-dimensional materials and metallic nanoparticles applied in more sensitive and stable SERS sensors for applications in real-time analysis.
2) Nanomateriais para eletro e fotocatálise
One of the most promising alternatives for a clean and renewable energy matrix is solar energy, in which photovoltaic and/or photoelectrochemical devices convert solar energy into chemical energy in the form of fuels or directly into electrical energy. In this sense, nanomaterials' differentiated properties, especially those resulting from the interaction of light with them, have a great impact on increasing the efficiency of the conversion of solar energy. Our research aims to produce, characterize, and apply nanomaterials in catalysts for the production of renewable fuels, combining experimental and theoretical studies in search of more efficient catalysts.
When supported on two-dimensional materials, such as graphene and its derivatives, the catalytic properties of metallic nanoparticles, for example, can be improved due to the high surface area, chemical and thermal stability, and the influence of adjustable bandgaps of materials such as graphene. In graphene oxide hybrid materials and metallic nanoparticles, for example, the graphene oxide sheet can act as an electron or hole receptor, increasing the number and lifetime of electron-hole pairs. These properties can be exploited for the production of renewable fuels from low energy density compounds.
