Photochemistry properties of silicon based materials

PAULA CAREGNATO

Teresina

Workshop; II Workshop da Pós- Graduação em Ciência e Engenharia dos Materiais / I International Conference on Materials Science of Piaui; 2018

MINISTÉRIO DA EDUCAÇÃO, UNIVERSIDADE FEDERAL DO PIAUÍ

The desirability of constructing optoelectronic and fluorescence display devices and sensors based on silicon has prompted the exponentially growing interest in the preparation and characterization of light-emitting silicon particles. Silicon is a common trace element in humans and the primary biodegradation product of porous Si, orthosilicic acid (Si(OH)4), is the form predominantly absorbed by humans and is naturally present in numerous tissues. Nanoparticles and porous silicon have low toxicity, and most importantly, they are biodegradable and biocompatible.Silicon nanoparticles of radii smaller than 4 nm (SiNPs) have received great attention, because besides being photosensitizers of singlet oxygen, they have a rich surface chemistry.Surface modifications, such as coating/linking with folate, antibodies, adjuvants, and various other substances can increase particle solubility, biocompatibility, targeting potential, and circulation time in biological systems.There are challenges to using silicon particles as sensors and photosensitizers: Particle photoluminescence and cytotoxicity depend on size and crystallinity, but also on surface structure and chemistry as well as interaction with components of biological media. Nonetheless, through careful design it is possible to develop multifunctional particles with potential applications in imaging, diagnosis, and therapy.