Cláudio MR Almeida is a PhD student at the Department of Chemical Engineering of the University of Coimbra in Portugal. He participated in three research projects the field of electrochemistry and nanotechnology. He has about 8 years of research experience in the field of chemistry/material chemistry with an emphasis on nanotechnology, colloid chemistry, surface chemistry and sensors development. He is currently working on the development of paper-based optical and electrochemical sensors based on silica sol-gel.