Browsing by Subject "Polymer thin films"
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Item Embargo Fully transparent and superhydrophobic electrodes enabled by soft interfaces(Elsevier BV, 2022-12-16) Torun, İ.; Çelik, N.; Kiremitler, N. B.; Huang, X.; Önses, Mustafa SerdarThe simultaneous achievement of transparency, electrical conductivity and superhydrophobicity is a highly challenging and rewarding task for a range of technological applications. This manuscript reports a practical and fluorine-free approach for fully transparent and superhydrophobic coatings on a transparent electrode. The first step consists of the formation of a grafted film of poly(ethylene glycol) on an indium oxide coated glass substrate. The superhydrophobicity is then achieved by spray-coating a film of alkylsilane functionalized nanoparticles. The self-assembly of the hydrophobic nanoparticles on end-grafted poly(ethylene glycol) allows for controlled formation of roughness without sacrificing the transparency and electrical conductivity. The result is a multi-functional substrate with a static contact angle of 172°, sliding angle of 1°, 90.4% transparency at a wavelength of 550 nm, and a sheet resistance of 13.05 Ω/sq. The surface has high water impact-resistance and thermal stability provided by the soft-interface composed of end-grafted poly(ethylene glycol). The reported substrate exhibits outstanding figures of merit in terms of the water repellency, optoelectronic performance, and stability. Application in transparent heaters demonstrates the promise of the presented multi-functional coatings.Item Open Access Solid substrates decorated with Ag nanostructures for the catalytic degradation of methyl orange(Elsevier, 2018) Şakır, M.; Önses, M. SerdarThere is a strong demand for development of catalytically active solid substrates for heterogeneous catalysis applications. This study reports fully solution-processable and scalable fabrication of solid substrates decorated with Ag nanostructures for the degradation of organic dyes. Ag nanostructures were prepared by direct surface-growth from Pt nanoparticles that were immobilized on Si substrates modified with a layer of end-grafted poly(2-vinylpyridine). The proper choice of the growth conditions and seed-selective growth from Pt nanoparticles were critically important in fabricating Ag nanostructures with high catalytic activity and large surface coverage. The catalytic performance of the presented platform was studied by the reduction of methyl orange by borohydride ions and monitored using UV–visible spectrometry. The substrates exhibited high catalytic activity enabling degradation of 10−5 M methyl orange solution in less than an hour with an apparent reaction rate constant of 33.5 × 10−3 min−1. The substrates can be easily removed from the degradation medium and used multiple times. Our approach presents an effective strategy for waste water management applications avoiding the agglomeration and separation issues of colloidal catalysts and overcoming the need for tedious and costly fabrication of thin films.