Controlling the photoconductivity: Graphene oxide and polyaniline self assembled intercalation

Vempati, Sesha
Ozcan, Sefika
UYAR, Tamer
We report on controlling the optoelectronic properties of self-assembled intercalating compound of graphene oxide (GO) and HCl doped polyaniline (PANI). Optical emission and X-ray diffraction studies revealed a secondary doping phenomenon of PANI with -OH and -COOH groups of GO, which essentially arbitrate the intercalation. A control on the polarity and the magnitude of the photoresponse (PR) is harnessed by manipulating the weight ratios of PANI to GO (viz., 1: 1.5 and 1:2.2 are abbreviated as PG1.5 and PG2.2, respectively), where +/-PR=100(R-Dark -RUV-Vis)/ R-Dark and R corresponds to the resistance of the device in dark or UV-Vis illumination. To be precise, the PR from GO, PANI, PG1.5, and PG2.2 are +34%, -111%, -51%, and +58%, respectively. (C) 2015 AIP Publishing LLC.


Tungsten(VI) oxide supported rhodium nanoparticles: Highly active catalysts in hydrogen generation from ammonia borane
Akbayrak, Serdar; Tonbul, Yalcin; Özkar, Saim (2021-04-01)
Herein, we report the use of tungsten(VI) oxide (WO3) as support for Rh0 nanoparticles. The resulting Rh0/WO3 nanoparticles are highly active and stable catalysts in H2 generation from the hydrolysis of ammonia borane (AB). We present the results of our investigation on the particle size distribution, catalytic activity and stability of Rh0/WO3 catalysts with 0.5%, 1.0%, 2.0% wt. Rh loadings in the hydrolysis reaction. The results reveal that Rh0/WO3 (0.5% wt. Rh) is very promising catalyst providing a turn...
Planar silicon-rich nitride resonators doped with neodymium
Olaosebikan, Debo; Lipson, Michal; Yerci, Selçuk; Negro, Luca Dal (2011-12-01)
We report on the characterization of neodymium doped silicon rich nitride resonators at 1550nm. We demonstrate the feasibility of use in photonic circuits and demonstrate ring resonators with quality factors of > 5,000.
Optimisation of micro-arc oxidation electrolyte for fabrication of antibacterial coating on titanium
Aydogan, Dilek Teker; Muhaffel, Faiz; Kilic, Meryem Menekse; Acar, Ozge Karabiyik; Cempura, Grzegorz; Baydoğan, Murat; Gül-karagüler, Nevin; Kose, Gamze Torun; Czyrska-Filemonowicz, Aleksandra; Çimenoğlu, Hüseyin (2018-01-01)
This study has been carried out to optimise the silver (Ag) content of the coating synthesised on commercially pure titanium (Cp-Ti, Grade 4) for biomedical applications by micro-arc oxidation (MAO) process. The MAO process has been conducted in electrolytes containing silver acetate (AgC2H3O2) at different concentrations between 0 and 0.002 mol L-1. When compared to the base electrolyte, coatings synthesised in >= 0.001 mol L-1 AgC2H3O2 added electrolytes exhibited an antibacterial efficiency of 99.8% agai...
Modeling of Magnetic Properties of Nanocrystalline La-doped Barium Hexaferrite
KÜÇÜK, İLKER; Sozeri, Huseyin; Ozkan, Husnu (Springer Science and Business Media LLC, 2011-05-01)
In this paper an artificial neural network (ANN) has been developed to compute the magnetization of the pure and La-doped barium ferrite powders synthesized in ammonium nitrate melt. The input parameters were: the Fe/Ba ratio, La content, sintering temperature, HCl washing and applied magnetic field. A total of 8284 input data set from currently measured 35 different samples with different Fe/Ba ratios, La contents and washed or not washed in HCl were available. These data were used in the training set for ...
Investigation of bismuth doped bioglass/graphene oxide nanocomposites for bone tissue engineering
Pazarçeviren, Ahmet Engin; Tezcaner, Ayşen; Keskin, Dilek; Evis, Zafer (2018-03-01)
In this study, bismuth doped 45S5 nanobioactive bioglass (nBG) and graphene oxide (GO) nanocomposites were developed and characterized in terms of microstructural, mechanical, bioactivity and biological properties. Bismuth (Bi) - doped nBG was synthesized by sol-gel method and sintered at 600 degrees C for 2 h. Nanosized GO was homogeneously mixed with Bi doped bioglass at various ratios to prepare nanocomposites. Addition of Bi increased the density of nBG samples while a considerable decrease in density w...
Citation Formats
S. Vempati, S. Ozcan, and T. UYAR, “Controlling the photoconductivity: Graphene oxide and polyaniline self assembled intercalation,” APPLIED PHYSICS LETTERS, pp. 0–0, 2015, Accessed: 00, 2020. [Online]. Available: