Poole-Frenkel emission on functionalized, multilayered-packed reduced graphene oxide nanoplatelets

Author(s)

Jimenez, Mawin J. M. ^[1] ; de Oliveira, Rafael F. ^[2] ; Shimizu, Flavio M. ^{[2, 3]} ; Bufon, Carlos Cesar B. ^[2] ; Rodrigues, Varlei ^[1] ; Gobbi, Angelo L. ^[2] ; Piazzetta, Maria H. O. ^[2] ; Riul JR, Antonio ^[1]

Affiliation

^[1] Univ Campinas UNICAMP, Gleb Wataghin Inst Phys IFGW, Dept Appl Phys, BR-13083970 Campinas, SP - Brazil

^[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, BR-13083970 Campinas, SP - Brazil

^[3] Univ Sao Paulo, IFSC, BR-13560250 Sao Carlos, SP - Brazil

• Document type: Journal article
• Source: Nanotechnology; v. 29, n. 50 DEC 14 2018.
• Web of Science Citations: 4

Abstract

The unique electronic, mechanical and optical properties of graphene make it a remarkable 2D material, widely explored in a plethora of applications. However, graphene zero-bandgap and the production of defect-free pristine graphene in large areas still limit some applications. To circumvent these issues, graphene-derived 2D materials have arisen as attractive candidates for low-dimensional systems, which requires a better comprehension of their properties. Here, we report a detailed investigation of the conduction mechanisms of two functionalized reduced graphene oxides (rGOs) nanoplatelets, named GPAH and GPSS. The functionalized rGO nanoplatelets were bottom-up assembled via the layer-by-layer technique, enabling molecular-level thickness control of nanostructures with well-defined composition and structure. For the reported multilayered GPAH/GPSS films the charge carriers followed Mott's law, presenting a typical conduction behavior of 2D systems described by the Poole-Frenkel model. The multilayered GPAH/GPSS nanostructure presented a conductivity of 10(-4)S cm(-1), optical bandgap of similar to 3.3 eV and a relative dielectric permittivity (epsilon(r)) of 6.4. Temperature-dependent I-V measurements indicated a strong variation of er below the critical temperature (T-C = 237 K), associated with a high dipole reorientation in the formed GPAH/GPSS nanostructure. All these characteristics make the GPAH/GPSS nanocomposite attractive for graphene-oriented applications, such as electronic devices. (AU)

• FAPESP's process: 14/25979-2 - Fabrication and characterization of devices and systems based on hybrid nanomembranes
• Grantee: Carlos César Bof Bufon
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 14/03691-7 - Fabrication of microfluidic devices envisanging aplications in precision agriculture and bioenergy
• Grantee: Antonio Riul Júnior
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants