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- MakaleAçık Erişim2026Scopus SJRQ2Oxidative polycondensation of phenylhydrazine-based Schiff base: structural, thermal, optical and dielectric investigations
Kaya, İsmet; Bayır, Erdal; Solmaz, Adnan
In this study, the Schiff base 3-((2-phenylhydrazono)methyl)benzene-1,2-diol (3-PHMB) was synthesized through a condensation reaction between 2,3-dihydroxybenzaldehyde (2,3-DHBA) and phenylhydrazine (PH). The obtained Schiff base was subsequently subjected to oxidative polymerization in a 10% KOH (w/v) aqueous medium using hydrogen peroxide (35% H₂O₂), sodium hypochlorite (6–14% NaOCl), and oxygen (O₂) as oxidants, yielding the oligomers o-(3-PHMB)-P, o-(3-PHMB)-H, and o-(3-PHMB)-O. The structural, morphological, thermal, optical, and electrochemical characteristics of the synthesized compounds were comprehensively investigated using FT-IR, NMR, SEM, TG-DTA, UV-Vis, CV, and GPC techniques. UV-Vis and CV analyses revealed that the optical band gaps (Eg) were 2.33 eV for 3-PHMB, 2.06 eV for o-(3-PHMB)-P, 2.16 eV for o-(3-PHMB)-H, and 2.02 eV for o-(3-PHMB)-O, while the electrochemical band gaps (Eg′) were calculated as 2.03 eV, 1.65 eV, 1.63 eV, and 1.50 eV, respectively. Thermal analysis showed that the char yields at 1000 °C were 41.43% for o-(3-PHMB)-P, 38.72% for o-(3-PHMB)-H, and 44.35% for o-(3-PHMB)-O. Dielectric measurements indicated that o-(3-PHMB)-O exhibited higher polarization capacity and energy storage ability compared to the other oligomers. Moreover, the electrical conductivity values increased steadily with frequency; at 100 kHz, the conductivity was recorded as 1.74 × 10⁻⁵ S cm⁻¹ for o-(3-PHMB)-O and 1.64 × 10⁻⁵ S cm⁻¹ for o-(3-PHMB)-P. These findings demonstrate that the synthesized Schiff base oligomers are promising candidates for dielectric and optoelectronic applications due to their high thermal stability, controlled molecular weight distribution, and semiconducting properties.
- Kitap BölümüYalnız künye2025DLC coatings for optical and optoelectronic applications
Koç, Mümin Mehmet; Aslan, Naim
Diamond-like carbon (DLC) materials, special amorphous forms of carbon, are quite stable and durable, therefore finding applications in different industries. It baffles people from both industrial and scientific communities where tribological, mechanical, chemical, optical, and optoelectronic properties were used for various applications. DLC films were used in different optical applications regarding their optical performance. Having outstanding shear and mechanical performance and high chemical inertness makes DLC thin films a suitable candidate for optical applications and devices that work under tough conditions. Thus, they were preferred in photovoltaic devices, monitors, cameras, lenses, medical devices, fiber optic cable technologies, and illumination technologies. Their absorption, emission, and transmission characteristics were also addressed in various optical applications and studies.
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