Investigation of Electronic Transport in Multiflake Films of 2D Materials Processed in Liquid Phase

• Grant number: 25/06550-0
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: August 01, 2025
• End date: December 31, 2025
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Rafael Furlan de Oliveira
• Grantee: Marcella Fernanda Damaceno Neves
• Host Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brazil
• Associated research grant: 21/06238-5 - Functionalized solution-processed 2D materials: development of prototyping electric sensors and biosensors, AP.JP

Abstract

Since the isolation of a monoatomic layer of carbon called graphene in 2004 and the observation of its unique electronic properties, the research area in 2D materials has attracted great scientific interest. Among the variety of existing 2D materials, reduced graphene oxide (rGO) emerges as a material whose properties are controllable by different reduction methods (such as thermal, electrochemical and chemical reduction) and which can be processed by means of aqueous suspensions of graphene oxide (GO), resulting in a material whose properties are dependent on the remaining functional groups. In this work, we aim to investigate the electrical transport characteristics in two-dimensional materials processed in liquid phase, especially rGO, by means of resistance measurements as a function of temperature and applied magnetic fields. As preliminary results, we observed in magnetoresistance (MR) measurements at low temperatures (< 25K) the presence of characteristic signatures of quantum interference phenomena, such as weak localization (WL), typical of disordered systems, and weak antilocalization (WAL), the latter rarely observed in rGO samples. Thus, this project aims to systematically investigate rGO multiflake samples in order to elucidate the origin of the observed phenomena and possible implications for the performance of new electronic devices. (AU)