Sustainable electrochemical sensors in kraft paper modified with cobalt nanoparticles for drugs and food applications

• Grant number: 25/14609-4
• Support Opportunities: Scholarships abroad - Research
• Start date: January 01, 2026
• End date: March 31, 2026
• Field of knowledge: Physical Sciences and Mathematics - Chemistry - Analytical Chemistry
• Principal Investigator: Bruno Campos Janegitz
• Grantee: Bruno Campos Janegitz
• Host Investigator: Dario Compagnone
• Host Institution: Centro de Ciências Agrárias (CCA). Universidade Federal de São Carlos (UFSCAR). Araras , SP, Brazil
• Institution abroad: Università Degli Studi Di Teramo, Italy

Abstract

This project aims to develop low-cost, disposable, and sustainable electrochemical sensors based on paper substrates modified with cobalt nanoparticles. Two fabrication approaches will be explored: (i) screen printing of conductive inks formulated with carbon black and automotive varnish, and (ii) CO¿ laser-induced pyrolysis (LIG), applied directly onto kraft paper substrates. Both strategies will be followed by electrocatalytic modification using cobalt nanoparticles generated via laser irradiation, aiming to enhance the electrochemical activity of the devices. The proposal also highlights the importance of a deep understanding of the processes involved in the formation of conductive materials and metallic nanoparticles induced by CO¿ laser irradiation. A systematic investigation of these phenomena is essential to optimize experimental conditions and expand scientific knowledge in the field. Furthermore, it represents a strategic step in advancing human resource development, thereby strengthening their role in creating advanced and sustainable sensing technologies. The project proposes the detection of analytes of medical and food interest, with an initial focus on detecting vitamin B12 in pharmaceutical products and ochratoxin A in wheat and coffee samples, using techniques such as cyclic voltammetry and differential pulse voltammetry. Sensor development and characterization will be carried out using microscopic, spectroscopic, and electroanalytical techniques. The goal is to obtain highly efficient, functional, and biodegradable devices aligned with the principles of sustainable technological innovation. Conducting the research abroad, under the supervision of Prof. Dr. Dario Compagnone (Università degli Studi di Teramo, Italy), will allow for knowledge exchange, access to advanced infrastructure, and the consolidation of international scientific collaborations.