Reagentless fabrication of a porous graphene-like electrochemical device from phenolic paper using laser-scribing

Agradecimentos: We acknowledge financial support from the Brazilian agencies FAPESP (Grant Numbers: 2017/10522-5, 2018/16250-0, 2018/08782-1, 2009/054066-7, and 2007/54829-5), CAPES (Grant Number 3359/2014 Pró-Forenses Edital 25/2014), CNPq (grant numbers: 444498/2014-1, 438828/2018- 6, 306690/2015-2, and 305605/2017-8) and INCTBio (573672/2008-3). Additionally, the authors are grateful to Professor Dr. Susana Torresi and A. C. Silva for contact angle measurements. We thank Central Analítica e Central Multiusuário at IQ-USP and IQ-UNICAMP for providing the infrastructure Abstract: This study fabricated a portable, high-performance, and reagentless electrochemical devices using CO2 laser-scribing process, which allowed localized carbonization of a non-conductive and low-cost polymer platform, i.e., phenolic-paper. The carbonized material was extensively characterized by Raman spectroscopy, XPS, XRD, SEM, and electrochemical impedance spectroscopy. The carbon-based electrodes were obtained from the photothermal process induced by CO2 laser radiation and subsequently subjected to electrochemical treatment to fabricate a functional material with excellent conductivity and low charge-transfer resistance. Additionally, the laser-scribed electrodes presented a porous structure with graphene-like domains, thus indicating both potential for on-site electroanalytical applications and better performance than conventional carbon electrodes FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ Fechado