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- Acetylcholinesterase (1)
- Antioxidants (1)
- Copper/graphene oxide (1)
- Core-shell (1)
- M-doped TiO2 (1)
- Nanopesticides (1)
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- Rhipicephalus rutilus (1)
- Rhipicephalus turanicus (1)
Organisationseinheit der BAM
Nanopesticides have been recently introduced as novel pesticides to overcome the drawbacks of using traditional synthetic pesticides. The present study evaluated the acaricidal activity of Copper/Graphene oxide core-shell nanoparticles against two tick species, Rhipicephalus rutilus and Rhipicephalus turanicus. The Copper/Graphene oxide core-shell nanoparticles were synthetized through the solution plasma (SP) method under different conditions. The nanoparticles synthesized at 180 W and 45 min were highly toxic to Rh. rutilus and Rh. turanicus, with 50% lethal concentration (LC50) values of 248.1 and 195.7 mg ml−1, respectively, followed by those which were synthesized at 120 W/30 mins (LC50 = 581.5 and 526.5 mg ml−1), 120 W/15 mins (LC50 = 606.9 and 686.7 mg ml−1), and 100/45 mins (LC50 = 792.9 and 710.7 mg ml−1), after 24 h of application. The enzyme assays revealed that 180 W/45 min treatment significantly inhibited the activity of acetylcholinesterase (115 ± 0.81 and 123 ± 0.33 U/ mg protein/min) and superoxide dismutase (290 ± 0.18 and 310 ± 0.92 U/ mg protein/min) in Rh. rutilus and Rh. turanicus, respectively, as compared with the negative control. The results also revealed a significantly increased catalase activity (895 ± 0.37 and 870 ± 0.31 U/ mg protein/min) in Rh. rutilus and Rh. turanicus, respectively. The above results indicated that Copper/Graphene oxide core-shell nanoparticles could be a promising alternatives for the management of ticks.
Plasma-liquid interaction, as a unique technique, was successfully employed to fabricate M-doped Fe₃O₄@SiO₂@TiO₂ (FST) core-shell nanostructures (M = Ag, Au, Zn, Pt, Cu, and C). Plasma enables effective dopant incorporation without phase segregation. Elemental mapping and transmission electron microscopy (TEM) confirmed the hierarchical architecture of the TiO₂ lattice, revealing a well-defined core-shell shape with uniform dopant dispersion. Extensive X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV–Vis), and Mott-Schottky investigations show that metal doping alters the electrical structure of TiO₂, resulting in bandgap narrowing, the formation of mid-gap states, and favorable band-edge alignment. Furthermore, adding interstitial nitrogen during plasma production enhances charge-carrier separation and light absorption.
Electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) evaluations reveal enhanced interfacial kinetics and lower charge transfer resistance. FST-Zn and FST-Ag presented the highest applied bias photon-to-current efficiency (∼0.60 and 0.65 %, respectively) and photocurrent densities (87 and 67 μA/cm² at 1.23 V vs. RHE). The superior photoelectrochemical performance of FST-Ag reflects the synergistic interplay among plasmonic effects, defect engineering, and the Schottky junction barrier. This work highlights how well plasma-assisted doping can tailor the optoelectronic features of semiconductor nanostructures, providing an achievable route for the development of highly effective, magnetically recoverable photo-electrocatalysts for environmental remediation and solar-driven water splitting.
