Effect of P<sub>2</sub>O<sub>5</sub> Content on Luminescence of Reduced Graphene-Oxide-Doped ZnO–P<sub>2</sub>O<sub>5</sub> Nano-Structured Films Prepared via the Sol–Gel Method
Ileana Cristina Vasiliu,
Ana Violeta Filip,
Irinela Chilibon,
Mihail Elisa,
Cristina Bartha,
Victor Kuncser,
Aurel Leca,
Lucica Boroica,
Bogdan Alexandru Sava,
Roxana Trusca,
Mihai Eftimie,
Adrian Nicoara
Affiliations
Ileana Cristina Vasiliu
National Institute for Research and Development in Optoelectronics—INOE 2000, 409 Atomistilor Str., RO-077125 Magurele, Romania
Ana Violeta Filip
National Institute for Laser, Plasma and Radiation Physics (INFLPR), 409 Atomistilor Str., RO-077125 Magurele, Romania
Irinela Chilibon
National Institute for Research and Development in Optoelectronics—INOE 2000, 409 Atomistilor Str., RO-077125 Magurele, Romania
Mihail Elisa
National Institute for Research and Development in Optoelectronics—INOE 2000, 409 Atomistilor Str., RO-077125 Magurele, Romania
Cristina Bartha
National Institute of Materials Physics, 405 A Atomistilor Str., RO-077125 Magurele, Romania
Victor Kuncser
National Institute of Materials Physics, 405 A Atomistilor Str., RO-077125 Magurele, Romania
Aurel Leca
National Institute of Materials Physics, 405 A Atomistilor Str., RO-077125 Magurele, Romania
Lucica Boroica
National Institute for Laser, Plasma and Radiation Physics (INFLPR), 409 Atomistilor Str., RO-077125 Magurele, Romania
Bogdan Alexandru Sava
National Institute for Laser, Plasma and Radiation Physics (INFLPR), 409 Atomistilor Str., RO-077125 Magurele, Romania
Roxana Trusca
Faculty of Engineering in Foreign Languages, University of Science and Technology “Politehnica” of Bucharest, 313 Splaiul Independentei Str., RO-060042 Bucharest, Romania
Mihai Eftimie
Department of Science and Engineering of Oxide Materials and Nanomaterials, National University of Science and Technology “Politehnica” of Bucharest, 1 Polizu Street, RO-011061 Bucharest, Romania
Adrian Nicoara
Department of Science and Engineering of Oxide Materials and Nanomaterials, National University of Science and Technology “Politehnica” of Bucharest, 1 Polizu Street, RO-011061 Bucharest, Romania
A convenient and low-cost sol–gel approach for the one-step synthesis of ZnO–P2O5–rGO nanostructures with tuned bandgap and fluorescence was investigated. The obtained hybrid nanostructures exploit the properties of zinc oxide, graphene oxide and phosphorous oxide as promising candidates for a wide range of optoelectronic applications. A predominant amorphous structure, ZnO–P2O5–rGO, containing ZnO nanorods was evidenced by X-ray diffraction analysis (XRD) and scanning electron microscopy (SEM). The estimated size of the ZnO nanorods in nanostructures with P2O5 was noticed to decrease when the P2O5/ZnO ratio was increased. The presence of ZnO, P2O5 and rGO was confirmed by Fourier-transform infrared spectroscopy (FTIR) and Raman investigation. P2O5 was noticed to tune the bandgap and the fluorescence emissions of the nanostructured films, as estimated by UV–Vis–NIR and fluorescence spectroscopy, respectively. The electrical measurements performed at room temperature showed that the main influence on the film’s resistivity does not come from the 1% rGO doping but from the P2O5/ZnO ratio. It was found that a 10/90 molar ratio of P2O5/ZnO decreases the resistivity almost seven-fold compared with rGO-doped ZnO films.