TY - JOUR
T1 - Graphene oxide concentration effect on the optoelectronic properties of ZnO/GO nanocomposites
AU - Boukhoubza, Issam
AU - Khenfouch, Mohammed
AU - Achehboune, Mohamed
AU - Leontie, Liviu
AU - Galca, Aurelian Catalin
AU - Enculescu, Monica
AU - Carlescu, Aurelian
AU - Guerboub, Mohammed
AU - Mothudi, Bakang Moses
AU - Jorio, Anouar
AU - Zorkani, Izeddine
N1 - Funding Information:
Funding: A.C.G. and M.E. acknowledge the financial support from the Romanian Ministry of Education and Research in the framework of Core Program PN19-03 (contract no. 21 N/08.02.2019). This research was funded by UEFISCDI, project number ERANET-MANUNET-III-MINaFBioS.
Funding Information:
A.C.G. and M.E. acknowledge the financial support from the Romanian Ministry of Education and Research in the framework of Core Program PN19-03 (contract no. 21 N/08.02.2019). This research was funded by UEFISCDI, project number ERANET-MANUNET-III-MINaFBioS. M.G. acknowledges the Romanian Ministry of Foreign Affairs and the Agence Universitaire de la Francophonie for the Eugen Ionescu research and mobility grant at the National Institute of Materials Physics. This work was supported by a grant from UEFISCDI, project number ERANET-MANUNET-III-MINaFBioS. A.C.G. and M.E. acknowledge the Romanian Ministry of Education and Research in the framework of Core Program PN19-03 (contract no. 21 N/08.02.2019) for the financial support. Special thanks to the Alexandru Ioan Cuza University of Iasi (Romania), the Faculty of Physics, University of South Africa, and the Department of Physics and Africa Graphene Center (South Africa).
Funding Information:
Acknowledgments: M.G. acknowledges the Romanian Ministry of Foreign Affairs and the Agence Universitaire de la Francophonie for the Eugen Ionescu research and mobility grant at the National Institute of Materials Physics. This work was supported by a grant from UEFISCDI, project number ERANET-MANUNET-III-MINaFBioS. A.C.G. and M.E. acknowledge the Romanian Ministry of Education and Research in the framework of Core Program PN19-03 (contract no. 21 N/08.02.2019) for the financial support. Special thanks to the Alexandru Ioan Cuza University of Iasi (Romania), the Faculty of Physics, University of South Africa, and the Department of Physics and Africa Graphene Center (South Africa).
Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
PY - 2020/8
Y1 - 2020/8
N2 - In this work, the effects of graphene oxide (GO) concentrations (1.5 wt.%, 2.5 wt.%, and 5 wt.%) on the structural, morphological, optical, and luminescence properties of zinc oxide nanorods (ZnO NRs)/GO nanocomposites, synthesized by a facile hydrothermal process, were investigated. X-ray diffraction (XRD) patterns of NRs revealed the hexagonal wurtzite structure for all composites with an average coherence length of about 40–60 nm. A scanning electron microscopy (SEM) study confirmed the presence of transparent and wrinkled, dense GO nanosheets among flower-like ZnO nanorods, depending on the GO amounts used in preparation. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption spectroscopy, and photoluminescence (PL) measurements revealed the impact of GO concentration on the optical and luminescence properties of ZnO NRs/GO nanocomposites. The energy band gap of the ZnO nanorods was independent of GO concentration. Photoluminescence spectra of nanocomposites showed a significant decrease in the intensities in the visible light range and red shifted suggesting a charge transfer process. The nanocomposites’ chromaticity coordinates for CIE 1931 color space were estimated to be (0.33, 0.34), close to pure white ones. The obtained results highlight the possibility of using these nanocomposites to achieve good performance and suitability for optoelectronic applications.
AB - In this work, the effects of graphene oxide (GO) concentrations (1.5 wt.%, 2.5 wt.%, and 5 wt.%) on the structural, morphological, optical, and luminescence properties of zinc oxide nanorods (ZnO NRs)/GO nanocomposites, synthesized by a facile hydrothermal process, were investigated. X-ray diffraction (XRD) patterns of NRs revealed the hexagonal wurtzite structure for all composites with an average coherence length of about 40–60 nm. A scanning electron microscopy (SEM) study confirmed the presence of transparent and wrinkled, dense GO nanosheets among flower-like ZnO nanorods, depending on the GO amounts used in preparation. Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis) absorption spectroscopy, and photoluminescence (PL) measurements revealed the impact of GO concentration on the optical and luminescence properties of ZnO NRs/GO nanocomposites. The energy band gap of the ZnO nanorods was independent of GO concentration. Photoluminescence spectra of nanocomposites showed a significant decrease in the intensities in the visible light range and red shifted suggesting a charge transfer process. The nanocomposites’ chromaticity coordinates for CIE 1931 color space were estimated to be (0.33, 0.34), close to pure white ones. The obtained results highlight the possibility of using these nanocomposites to achieve good performance and suitability for optoelectronic applications.
KW - CIE diagram
KW - Hydrothermal method
KW - Optoelectronic properties
KW - ZnO NRs/GO nanocomposites
UR - http://www.scopus.com/inward/record.url?scp=85090628780&partnerID=8YFLogxK
U2 - 10.3390/nano10081532
DO - 10.3390/nano10081532
M3 - Article
AN - SCOPUS:85090628780
SN - 2079-4991
VL - 10
SP - 1
EP - 16
JO - Nanomaterials
JF - Nanomaterials
IS - 8
M1 - 1532
ER -