Hunting black color via absorption engineering: EDOT and thiophene-benzothiadiazole based black-to-transmissive copolymer and its electrochromic device application

Ergün, Emine Gül Cansu
Akbayrak, Merve
Neutral state black electrochromics are prominent materials for smart applications such as displays, car rear views, e-papers etc. This work has aimed to obtain a neutral state black electrochromic polymer, by tuning the optical absorbance to whole visible region. Two monomers, 4,7-bis(5-(thiophen-2-yl)thiophen-2-yl)benzo[c] [1,2,5]thiadiazole (TTBTT) and 3,4-ethylenedioxythiophene (EDOT), were selected according to their complementary absorbance behaviors, and they were combined in the same polymer backbone via electrochemical copolymerization technique. Copolymerization was performed using three different monomer feed ratios (2:1, 1:1 and 1:2 (EDOT: TTBTT)). Even though all the copolymers exhibited dark to transmissive colors from neutral to oxidized states, changing the monomer feed resulted in different optical contrast, switching response and color hues for each copolymer. The higher optical contrast (from 17% to 27%) and faster switching response (from 3.6s to 1.8s) were recorded as EDOT unit increase in the copolymer chain. A dual type electrochromic device was also constructed using the copolymer and the resulting device was successfully changed its color from black to transmissive.


Water Impact Resistant and Antireflective Superhydrophobic Surfaces Fabricated by Spray Coating of Nanoparticles: Interface Engineering via End-Grafted Polymers
Torun, Ilker; Celik, Nusret; Hancer, Mehmet; Es, Fırat; Emir, Cansu; Turan, Raşit; Önses, Mustafa Serdar (American Chemical Society (ACS), 2018-12-11)
Fully transparent and water impact resistant superhydrophobic coatings are of great importance for a range of applications including photovoltaics, photonics, automotive windshields, and building windows. A widely utilized approach to fabricate such coatings involves solution-based deposition of hydrophobic nanoparticles. A central challenge is that these coatings do not simultaneously offer high levels of water repellency, perfect transparence, and water impact resistance. Here we demonstrate that end-graf...
Passive flow control in boundary layer ingesting semi submerged inlet
Küçük, Umut Can; Uzol, Oğuz; Baran, Özgür Uğraş; Department of Aerospace Engineering (2015)
Submerged intake designs with high compactness provide lower radar cross sectional area, less noise, higher packaging e ffciency and lower drag compared to the conventional designs. However, in such an intake fl ow exposed to strong adverse pressure gradients both in streamwise and circumferential directions due to the centerline curvature and high diff usion rate through the intake. Since, flow inside submerged intakes is very sensitive to the upcoming flow quality, it is very common to encounter with hi...
Ünlüsoy, Yavuz Samim; Tümer, Sami Turgut (Elsevier BV, 1994-01-20)
The dynamic behavior of overhead cam mechanisms, commonly used in automotive applications, is strongly influenced by the Coulomb friction at the rocker arm pivot. In this study, a non-linear one-degree-of-freedom model of such a mechanism including Coulomb friction has been developed. An exact quasi-linear solution to the equations representing the non-linear behavior has been obtained. The effects of Coulomb friction at different cam speeds are investigated using typical parameter values. A critical examin...
Identification of low order vehicle handling models from multibody vehicle dynamics models
Sağlam, Ferhat; Ünlüsoy, Yavuz Samim; Department of Mechanical Engineering (2010)
Vehicle handling models are commonly used in the design and analysis of vehicle dynamics. Especially, with the advances in vehicle control systems need for accurate and simple vehicle handling models have increased. These models have parameters, some of which are known or easily obtainable, yet some of which are unknown or difficult to obtain. These parameters are obtained by system identification, which is the study of building model from experimental data. In this thesis, identification of vehicle handlin...
Experimental determination of transfer functions for a car body-in-white
Şentürk, Sabri; Ünlüsoy, Yavuz Samim; Department of Mechanical Engineering (2004)
Vibration generated from various sources (engine, road surface, tires, exhaust, etc.) should be considered in the design of a car body. These vibrations travel through transfer systems (drivetrain, suspension, body, etc.) to the steering wheel, seats and other areas where it is detected by the passengers of the vehicle. Transmission routes must be studied and efforts made to keep transfer systems from amplifying vibration and to absorb it instead. Since the superior vibration transfer system is the car body...
Citation Formats
E. G. C. Ergün and M. Akbayrak, “Hunting black color via absorption engineering: EDOT and thiophene-benzothiadiazole based black-to-transmissive copolymer and its electrochromic device application,” POLYMER, vol. 264, pp. 125565–125565, 2022, Accessed: 00, 2023. [Online]. Available: