Strong Inhibition of Silver-doped TiO2 Nanoparticles Against P. palmivora in Visible Light

• Published in: BioNanoScience 2022-06, Vol.12 (2), p.351-358
• Main Authors: Nurdin, Muhammad, Watoni, Abdul Haris, Arham, Zul, Yanti, Nur Arfa, Marlini, Sri, Maulidiyah, Maulidiyah, Salim, La Ode Agus, Irwan, Irwan
• Format: Article
• Language: English
• Subjects: Antifungal activity; Biological and Medical Physics; Biomaterials; Biophysics; Circuits and Systems; Colonies; Energy gap; Engineering; Fungicides; Light irradiation; Nanoparticles; Nanotechnology; Particle size distribution; Radiation; Silver; Titanium dioxide
• ISSN: 2191-1630; 2191-1649
• DOI: 10.1007/s12668-022-00963-5

In this study, Ag-doped TiO 2 nanoparticles (NTA) were synthesized and tested for their activity against the fungus Phytophthora palmivora ( P. palmivora ). The synthesis of NTA was carried out by sonification method at a frequency of 40 kHz and an ultrasonic intensity of 0.96 kWm −2 . The antifungal activity test was carried out with two treatments, namely without and with visible light radiation on P. palmivora colonies grown on PDA-NTA-mixed media. Based on SEM analysis, the morphology of NTA was composed of spherical grains with uniform particle size and uneven distribution on the NTA surface. The selection of Ag + ions as dopants effectively reduces the TiO 2 energy gap from 3.20 to 2.85 eV. This decrease is equivalent to a wavelength of 435 nm. The test of NTA activity against P. palmivora showed a significant difference in inhibition between the treatment with irradiation and without visible light irradiation. At a concentration of 0.05%, the inhibitory power of NTA against P. palmivora increased significantly. The minimum inhibitory level (%) of NTA in the treatment without irradiation was 40.62%, while with radiation it was 86.50%. P. palmivora colonies were totally killed at 0.50% NTA concentration.