Mühendislik Temel BilimleriEngineering Basic Scienceshttps://hdl.handle.net/20.500.12508/1262024-03-28T22:54:13Z2024-03-28T22:54:13ZElectrochromic Insight on Electro-Deposited Copolymers of Push-Pull Conjugated Systems with 3,4-Ethylenedioxythiophene (EDOT) and Other Conjugated UnitsErgün, Emine Gül CansuHacıoğlu, Şerife Özdemirhttps://hdl.handle.net/20.500.12508/30382024-01-18T12:12:59Z2023-01-01T00:00:00ZElectrochromic Insight on Electro-Deposited Copolymers of Push-Pull Conjugated Systems with 3,4-Ethylenedioxythiophene (EDOT) and Other Conjugated Units
Ergün, Emine Gül Cansu; Hacıoğlu, Şerife Özdemir
Third generation conducting polymers (CP) are push-pull type conjugated systems, which include both electron pushing and pulling units in their chemical structure. Push-pull design enables coarse and fine tuning in the electro-optical properties of the resulting CP such as lowering the band gap and enhancing electrochromic properties. Push-pull CPs have been widely used for various applications such as electrochromic devices, displays, light emitting diodes, organic solar cells, field effect transistors, electrochemical and optical sensors etc. This review aims to collect electrochemically synthesized CPs of push-pull systems in the literature, up to 2023. Most of the studies include 3,4-ethylenedioxythiophene (EDOT) as co-monomers, but there are also other studies such as obtaining push-pull type CPs by copolymerization, and copolymerization of push-pull systems with other units. Each case is discussed in separate sections. In the scope of this review, only electrochemical copolymerization studies are selected, and the effect of monomer feed ratio and the polymerization conditions on the electrochromic properties of the resulting copolymers are discussed and summarized in tables. This collection can serve as a guide for upcoming copolymerization studies, by giving an insight into optical and electrochromic properties of various copolymers of push-pull systems so far.
2023-01-01T00:00:00ZCobalt-doped MoO3 thin films and dual-band electrochromic devices with excellent cyclic stabilityTutel, YusufDurukan, Mete BatuhanHacıoǧlu, Şerife ÖzdemirBaşköse, Ümran CerenToppare, LeventÜnalan, Hüsnü Emrahhttps://hdl.handle.net/20.500.12508/29982024-01-15T07:42:56Z2023-01-01T00:00:00ZCobalt-doped MoO3 thin films and dual-band electrochromic devices with excellent cyclic stability
Tutel, Yusuf; Durukan, Mete Batuhan; Hacıoǧlu, Şerife Özdemir; Başköse, Ümran Ceren; Toppare, Levent; Ünalan, Hüsnü Emrah
Electrochromic (EC) technology has played a pivotal role in elevating the prominence of smart windows by enabling them to alter their color and effectively manage the level of transparency. Nanostructured molybdenum trioxide (MoO3) thin films are highly promising for the development of EC technology. However, the production of uniform, crack-free and durable MoO3 thin films through conventional deposition methods is still a challenge though these properties are critical for achieving prolonged cyclic stability. In this work, we demonstrate the use of ultrasonic spray deposited bare MoO3 and cobalt-doped MoO3 (MoO3:Co) thin films for EC applications. Cobalt (Co) doping is shown to significantly improve the cyclic stability when compared to the bare MoO3 films. Furthermore, MoO3:Co films have exhibited significant performance in novel dual-band electrochromic devices (ECD). After 5000 cycles, the MoO3:Co electrodes showed significantly higher capacitance retention (92%) compared to the bare MoO3 thin film electrodes (54%). Moreover, MoO3:Co electrodes exhibited a higher maximum transmittance change than the bare MoO3 electrodes. Dual-band ECDs showed excellent cycling performance up to 5000 cycles with a capacitance retention of 99%. Obtained results demonstrated the potential of the ultrasonic spray deposition method for MoO3 thin film based EC windows and dual-band ECDs with excellent cyclic stability.
2023-01-01T00:00:00ZApplications and Properties for Bivariate Bell-Based Frobenius-Type Eulerian PolynomialsKhan, Waseem AhmadAlatawi, Maryam SalemDuran, Uğurhttps://hdl.handle.net/20.500.12508/29802024-01-12T08:14:59Z2023-01-01T00:00:00ZApplications and Properties for Bivariate Bell-Based Frobenius-Type Eulerian Polynomials
Khan, Waseem Ahmad; Alatawi, Maryam Salem; Duran, Uğur
In this study, we introduce sine and cosine Bell-based Frobenius-type Eulerian polynomials, and by presenting several relations and applications, we analyze certain properties. Our first step is to obtain diverse relations and formulas that cover summation formulas, addition formulas, relations with earlier polynomials in the literature, and differentiation rules. Finally, after determining the first few zero values of the Eulerian polynomials, we draw graphical representations of these zero values.
2023-01-01T00:00:00ZGould-Hopper Based Degenerate Truncated Bernoulli PolynomialsDuran, Uğurhttps://hdl.handle.net/20.500.12508/29502024-01-18T08:03:31Z2022-01-01T00:00:00ZGould-Hopper Based Degenerate Truncated Bernoulli Polynomials
Duran, Uğur
In this study, we consider the truncated degenerate Bernoulli polynomials based on the Gould-Hopper polynomials and examine diverse properties and formulas covering addition formulas, correlations and derivation property. Then, we derive some interesting implicit summation formulas and symmetric identities. Moreover, we define Gould-Hopper based truncated degenerate Bernoulli polynomials of order rr and give some of their properties and relations.
2022-01-01T00:00:00Z