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Influenze OF Ag-dopant ratio on photocatalytic performance of laser-synthesized ZnO nanoparticles

In this work, Ag-doped ZnO nanoparticles are synthesized by using two-step laser synthesis. First, pulsed laser deposition (PLD) is used for deposition of Ag films on ZnO substrate. Such synthesized ZnO substrate covered with Ag layer is than put in the water in order to produce colloidal solution of Ag-doped ZnO nanoparticles by pulsed laser ablation in liquid (PLAL). Nd:Yag laser (pulse repetition 5 Hz, pulse duration 5 ns pulse duration, wavelength 1064 nm, single laser shot energy 300 mJ) was used for irradiation of targets in PLD and PLAL process [1]. In order to vary the Ag ratio in ZnO nanoparticles with different Ag ratio, different number of pulses (50, 200, 500, 1000, 2000 and 3000) were used in PLD for Ag deposition. The ratio of Ag dopant in ZnO nanoparticles strongly depends on the thickness of Ag layer at ZnO target. In each of six synthesized colloidal solutions Ag weight ratio is calculated using the data obtained by two various techniques, ICP-OES and XPS, while their photocatalytic performance is tested for degradation of Methylene Blue under UV irradiation. Various experimental techniques (XRD, XPS, SEM, UV-Vis) were used to determine the crystall structure, size- distribution and optical properties of Ag-doped ZnO nanoparticles. In this work we discuss the dependence of MB photodegradation rate on Ag-dopant ratio calculated from both methods, ICP-OES and XPS. Ag- doping is shown to increase the MB photodegradation rate about two times twice at 0.32 wt% of Ag in ZnO (calculated from ICP-OES). [1] Blažeka, D. ; Car, J. ; Klobučar, N. ; Jurov, A. ; Zavašnik, J. ; Jagodar, A. ; Kovačević, E. ; Krstulović, N. Photodegradation of Methylene Blue and Rhodamine b Using Laser-Synthesized ZnO Nanoparticles. Materials (Basel). 2020, 13, 1–15, doi:10.3390/ma13194357.

laser synthesized nanoparticles ; ZnO ; photocatalysis ; doped nanoparticles ; Ag doped ZnO

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