Browsing by Author "Odemis, Omer"

Now showing 1 - 6 of 6

Characterization of Silver Nanoparticles Fabricated by Green Synthesis Using Urtica Dioica and Lavandula Angustifolia and Investigation of Antimicrobial and Antioxidant
(Taylor & Francis inc, 2024) Odemis, Omer; Ozdemir, Sadin; Gonca, Serpil; Agirtas, Mehmet Salih
Silver nanoparticles (AgNPs) was synthesized from Urtica dioica (UDANP) and Lavandula angustifolia (LAANP) plants. Silver nanoparticles obtained from green synthesis were characterized by UV-Vis, FTIR, SEM, TEM. The DPPH scavenging activities of UDANP were found as 73.58, 84.61, 100, 100, and 100% at 12.5, 25, 50, 100, and 200 mg/L, respectively. On the other hand, DPPH radical scavenging abilities of LAANP were determined as 62.56, 73.07, 78.71, 86.92, and 100% at 12.5, 25, 50, 100, and 200 mg/L, respectively. The ferrous chelating activities of LAANP were found as 7.96, 17.59, 29.45, 41.63, and 59.44% at 12.5, 25, 50, 100, and 200 mg/L, respectively. Besides UDANP was showed 73.58 and 84.61% metal chelating activity at 12.5 and 25 mg/L, respectively. The antimicrobial activity of UDANP and LAANP was performed using broth-dilution method. After the cell viability test of UDANP and LAANP, E. coli cell growth inhibited as 100%.
Effect of Silver Nanoparticles Prepared by Green Chemistry on the Photovoltaic Properties of Zinc Phthalocyanine
(Springer int Publ Ag, 2024) Odemis, Omer; Agirtas, Mehmet Salih; Solgun, Derya Gungordu; Ozkartal, Abdullah
The use of silver nanoparticles (AgNPs) produced from sustainable resources to improve photovoltaic properties of dye-sensitized solar cells is gaining interest due to the growing demand for clean and green energy sources. In this study, leaf (HY) and flower (HC) extracts of Golden Grass (Helichrysum italicum) were used to produce AgNPs with a low cost and easy method. The enhancement in power conversion efficiency by adding AgNPs phthalocyanine produced from biomaterials was investigated. The formation of AgNPs is indicated by a strong surface plasmon resonance (SPR) at 441 nm for HY-AgNPs and 448 nm for HC-AgNPs. Spherical AgNPs were formed with an estimated diameter of 22.59 +/- 0.71 nm for HY-AgNPs and 21.06 +/- 0.95 nm for HC-AgNs, both with a face center cubic crystal structure. On the other hand, the zinc phthalocyanine complex designed for dye-sensitized solar cells was synthesized and characterized. At the same time, the aggregation and fluorescence properties of zinc phthalocyanine were investigated. The photovoltaic properties of the phthalocyanine compound used in the study were examined without and with silver nanoparticle additives. With this doping, the power conversion efficiency percentage increased from 2.32 to 3.41 for HY-AgNPs and from 2.32 to 2.92 for HC-AgNPs. Evaluation of the results reveals that the phthalocyanine compound gains more efficient photovoltaic properties with the doping of AgNPs for dye-sensitized solar cells.
The Study on Biological Activities of Silver Nanoparticles Produced Via Green Synthesis Method Using Salvia Officinalis and Thymus Vulgaris
(Tubitak Scientific & Technological Research Council Turkey, 2022) Odemis, Omer; Ozdemir, Sadin; Gonca, Serpil; Arslantas, Ali; Agirtas, Mehmet Salih
In the present study, Ag nanoparticles (AgNPs) were synthesized from Salvia officinalis and Thymus vulgaris, known as phytotherapy plants. The obtained silver nanoparticles were characterized using SEM, XRD, FTIR, and UV/Vis spectra. The antioxidant capacities of Salvia officinalis-mediated AgNP (SO-AgNP) and Thymus vulgaris-mediated AgNP (TV-AgNP) were analyzed in vitro using 1,1-diphenyl-2-picrylhydrazyl and iron chelating activity assays. DPPH activities were 83.74% and 57.17% for SO-AgNP and TV-AgNP at concentration 200 mg/L, respectively. Both green synthesized AgNPs exhibited good iron chelating activity. In addition, the DNA cleavage activities of SO-AgNPs and TV-AgNP were investigated with agarose gel electrophoresis technique. SO-AgNPs and TV-AgNP showed single-strand DNA cleavage activity. AgNPs showed that the SO-AgNP and TV-AgNp were effective against bacteria and fungi, and antimicrobic activities were assessed as minimal inhibition concentration (MIC). Remarkably, green synthesized AgNPs showed highly effective cell viability and biofilm inhibition effect. AgNPs also demonstrated slightly antimicrobial photodynamic activity after LED irradiation.
Synthesis of (2-(4 Ethoxy)-Substituted Silicon Phthalocyanine and Novel Green Silver Nanoparticles: Dssc Targets
(Taylor & Francis inc, 2024) Agirtas, Mehmet Salih; Odemis, Omer; Ozkartal, Abdullah
In this study, designed as a dye-sensitive solar cell material which, bis-(2-(4-methylthiazol-5-yl) ethoxy) phthalocyaninato silicon (IV) compound (3) was obtained from the chemical reaction of SiPcCl2 and 4-methyl-5-thiazoleethanol. Silver nanoparticles (AgNPs) were synthesized using environmentally friendly and cost-effective green methods using leaf and flower extracts of Corydalis cava(CoV) and Nonea pulla(NP) plants. For the characterization of phthalocyanine compound and silver nanoparticles, Transmission electron microscopy (TEM), 1H NMR, 13C NMR, X-Ray Diffraction (XRD), UV-visible, FT-IR and Mass spectrum devices were used. The power conversion efficiency of without doping compound 3 is 1.20. After doping this compound with CoVAgNPs and NPAgNPs, the power conversion efficiencies increased to 1.74 and 2.10. From this it is clearly seen that silver nanoparticles are effective. It is concluded that better photovoltaic materials can be created by using phthalocyanine and silver nanoparticles together.
Synthesis of CuO Nanoparticles With Anchusa Azurea Flower Extract and Investigation of Their Effect on Photovoltaic Activity by Doping With Phthalocyanine
(Taylor & Francis inc, 2025) Odemis, Omer; Solgun, Derya Gungordu; Ozkartal, Abdullah; Agirtas, Mehmet Salih
CuO nanoparticles were prepared with the extract of Anchusa azurea flowers and characterized by TEM, XRD, FT-IR, and UV-Vis. Dye-sensitized solar cell properties of phthalocyanines can be improved by doping with nanoparticles. In this context, the effects of prepared CuO nanoparticles phthalocyanines at different ratios were investigated. On the other hand, a zinc phthalocyanine compound from the phthalocyanine group with dye-sensitized solar cell (DSSC) properties was prepared. The capacity of the phthalocyanine compound for DSSC was investigated. In the first stage, phthalocyanine was investigated without additives. In the second stage, the phthalocyanine compound was investigated after doping with CuO nanoparticles at 1:1 and 1:2 ratios. Thus, the effect of power conversion power created by CuO nanoparticles on phthalocyanine was revealed. The results demonstrate that the power conversion efficiency increased notably from 1.56% to 2.83% and 3.41% with 1:1 and 1:2 doping ratios, respectively.
Synthesis of Silver Nanoparticles Formed by Chaerophyllum Macrospermum and Eremurus Spectabilis Biomaterial and Investigation of Photovoltaic Parameters by Adding Silicon Phthalocyanine
(Taylor & Francis Ltd, 2023) Agirtas, Mehmet Salih; Odemis, Omer; Solgun, Derya Gungordu; Tanriverdi, Aslihan Aycan; Ozkartal, Abdullah
Silver nanoparticles (AgNPs) were obtained by green synthesis using Chaerophyllum macrospermum (CM) and Eremurus spectabilis (ES). These particles were characterized by TEM, XRD, IR, UV, mass, and NMR spectra. TEM images show that the mean particle size of CM-AgNPs was 30 nm and the diameter of ES-AgNPs was 14.2 nm. XRD measurements showed that CM-AgNPs were 30.85 nm and ES-AgNPs 18.80 nm in a perfect face-centered cubic crystal structure. CM-AgNP showed maximum absorption at 453 nm and ES-AgNP at 455 nm; AgNPs exhibited a strong surface plasmon resonance (SPR) and played a role in stabilization. A silicon phthalocyanine compound was synthesized and characterized. The photovoltaic properties of the axial phthalocyanine compound with and without doping of Chaerophyllum macrospermum and Eremurus spectabilis silver nanoparticles were investigated. Better dye-sensitive solar cells were formed by doping silver nanoparticles to phthalocyanine compounds with an increase in the percentage of energy conversion efficiency by 0.26 with ESAgNP doping and 0.76 with CMAgNP doping.