RT Journal Article
T1 Nanostructural characterization of luminescent polyvinyl alcohol/graphene quantum dots nanocomposite films
A1 Elumalai, Dhanumalayan
A1 Rodríguez Fernández, Beatriz
A1 Kovtun, Ganna
A1 Hidalgo Alcalde, Pedro
A1 Méndez Martín, María Bianchi
A1 Kaleemulla, Shaik
A1 Joshi, Girish M
A1 Cuberes, M. Teresa
AB This study focuses on the fabrication of polymer nanocomposite films using polyvinyl alcohol (PVA)/graphene quantum dots (GQDs). We investigate the relationship between the structural, thermal, and nanoscale morphological properties of these films and their photoluminescent response. Although according to X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and differential thermal analysis (DTA), the incorporation of GQDs does not significantly affect the percentage crystallinity of the PVA matrix, for a range of added GQD concentrations, atomic force microscopy (AFM) showed the formation of islands with apparent crystalline morphology on the surface of the PVA/GQD films. This observation suggests that GQDs presumably act as nucleating agents for island growth. The incorporation of GQDs also led to the formation of characteristic surface pores with increased stiffness and frictional contrast, as indicated by ultrasonic force microscopy (UFM) and frictional force microscopy (FFM) data. The photoluminescence (PL) spectra of the films were found to depend both on the amount of GQDs incorporated and on the film morphology. For GQD loads >1.2%wt, a GQD-related band was observed at similar to 1650 cm(-1) in FT-IR, along with an increase in the PL band at lower energy. For a load of similar to 2%wt GQDs, the surface morphology was characterized by extended cluster aggregates with lower stiffness and friction than the surrounding matrix, and the PL signal decreased.
PB MDPI
YR 2023
FD 2023-12-19
LK https://hdl.handle.net/20.500.14352/102671
UL https://hdl.handle.net/20.500.14352/102671
LA eng
NO 2023 Descuentos MDPI
NO Universidad de Castilla La Mancha
NO Fondo Europeo de Desarrollo Regional (Unión Europea)
NO Ministerio de Ciencia e Innovación (España)
NO Unión Europea
NO Comunidad de Madrid
DS Docta Complutense
RD 8 abr 2025