Browsing by Author "Peksoz, Ahmet"
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Publication Energy storage and semiconducting properties of polyaniline/graphene oxide hybrid electrodes synthesized by one-pot electrochemical method(Elsevier, 2021-07-06) Tokgoz, Seyit Rıza; Firat, Yunus Emre; Akkurt, N.; Pat, S.; Peksoz, Ahmet; TOKGÖZ, SEYİT RIZA; Firat, Yunus Emre; PEKSÖZ, AHMET; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0003-0510-6640; 0000-0001-9135-1508; IXW-9711-2023; AAK-5283-2021; HRA-2244-2023; AAG-9772-2021Polyaniline/graphene oxide composites are produced by the one-pot electrochemical deposition method and are used as an electrode for supercapacitor energy storage. The electrochemical tests related to the energy storage performance of the PANI/GO electrodes at different mass loading of GO are successfully studied. The biggest specific capacitance for all of the electrodes is observed at a specific current of 0.3 A g(-1). Pure PANI electrode has a specific capacitance of 158.0 F g(-1), a specific energy of 18.2 W h kg(-1), and a corresponding specific power of 118.8 W kg(-1). After the loading of graphene oxide into PANI, the best specific capacitance measured at a current density of 0.3 A g(-1) is 295.9 F g(-1), and the corresponding specific energy and specific power are 34.0 Wh kg(-1) and 126.9 W kg(-1), respectively. The PANI/GO hybrid materials also exhibit a remarkably cycling stability with a capacitance retention range of 62.3%-83.7% after 5000 charge-discharge cycles. Charge transfer resistance of the PANI electrode desreases as GO loading increases. This means that electroactive surface area of the electrode increases due to the addition of GO into PANI. The enhancement in energy storage capability is supported by the increase in electroactive surface area. The high energy storage performance and easy production of PANI/GO materials make them promising electrodes for supercapacitor devices.Item Influence of oxide layer coating on giant magneto-impedance response in amorphous ribbons(Amer Scientific Publishers, 2013-01) Meydan, Turgut; Taysioğlu, Asli Ayten; Peksoz, Ahmet; Derebaşı, Naim; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Anabilim Dalı.; AAI-2254-2021; AAG-9772-2021; 18038658800; 23100976500; 11540936300Cobalt-rich amorphous ribbon (Fe5.85Co72.15Mo2B15Si5) 13 mm in length and 5 mm in width were coated with different oxide layers in order to improve their GMI response. The coating process was performed using a chemical Successive Ionic Layer Adsorption and Reaction (SILAR) technique at room temperature. Oxide layer coated ribbons were imaged by an Atomic Force Microscopy (AFM). The variations in oxide layers and their roughness were studied to elucidate the cause of the improvements in GMI ratios in amorphous ribbons.Item Investigation of giant magneto-impedance effect in inorganic nickel coated amorphous ribbons(American Scientific Publishers, 2013-01-01) Meydan, Turgut; Tayşioğlu, Aslı Ayten; Peksoz, Ahmet; Derebaşı, Naim; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; AAG-9772-2021; AAI-2254-2021; 18038658800; 23100976500; 11540936300Co-based amorphous ribbon Fe5.85Co70.15Mo4B15Si5 (Metglas 2705X) was coated by Nickel complexes in order to increase the giant magneto-impedance response. Influence of inorganic nickel complex coating on giant-magneto impedance (GMI) effect was investigated under varied applied dc fields (-8 kA/m).Item Magnetic responses of divinylbenzene-Fe3O4 composite film deposited by free radical polymerization method(Springer, 2018-03) Akay, Sertan Kemal; Peksoz, Ahmet; Kara, Ali; Uludağ Üniversitesi/Fen - Edebiyat Fakültesi/Fizik Bölümü.; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Kimya Bölümü.; 0000-0003-2457-6314; R-7260-2016; AAG-9772-2021; AAG-6271-2019; 24801954600; 23100976500; 7102824859The study reports some novel information on both production and characterization for the poly [DVB/Fe3O4] composite film deposited by free radical polymerization method. The composite film consists of a combination of organic phase and magnetite nanoparticles. The magnetization behavior of the poly [DVB/Fe3O4] composite film was analyzed with both vibrating sample magnetometers (VSM) and a technique of electron spin resonance (ESR). It was found that the ESR study performed at room temperature showed the poly [DVB/Fe3O4] composite film had strong transition of g (eff) similar to 2.5 (254 mT) due to the Fe3+ S-state ions. This g (eff) value indicated that the composite film behavior was near superparamagnetism. The VSM results also supported the ESR results.