TR – TechConnect Briefs

Graphene based core–shell additives for increasing the thermal conductivity of epoxy nanocomposites

Eksik O., Bartolucci S.F., Gupta T., Fard H., Tasciuca T.B., Koratkar N., Istanbul Technical University, TR

We studied novel technique to enhance the thermal conductivity of epoxy nanocomposites using graphene coated poly-methyl-methacrylate (PMMA) balls. PMMA balls with a diameter in the range of 200–300 nm were synthesized using suspension polymerization. These [...]

Indium Nitride Nanowire Growth by Chemical Vapor Deposition and Electrical Characterization

Teker K., Moussa O., Ali Y.A., Otto J., Istanbul Sehir University, TR

The III-nitrides have been intensely studied due to their wide range of applications from high efficiency solid-state lighting and photovoltaics to high-power and high temperature electronics. InN has received great attention due to its unique [...]

A model for an Optical Ring Microresonator towards Nanoparticle Detection

Ahmeti F., Teker K., Istanbul Sehir University, TR

Optical resonators have shown great potential as fundamental building blocks, in a wide range of photonic devices and applications including filters, optical multiplexers, logic gates, switches and sensors. A microresonator is defined by a micron-scale [...]

Optical-base pressure sensing ability of Yb3+:Y2Si2O7 nanoparticles

Erdem M., Eryurek G., Dibartolo B., Marmara University, TR

We report the the drastic dependence on pressure of the spectral output of Yb3+:Y2Si2O7 nanoparticles under IR excitation. The spectrum obtained at atmospheric pressure consisted of an intense blue band. At low pressure the spectrum [...]

Effect of Pressure and Excitation Power on Up-conversion Assisted White Light Emission in Yttrium Oxide and Silicate Nanophosphors

Eryurek G., Erdem M., Bilir G., Istanbul Technical University, TR

The production of warm artificial white light (WL) become a big challenge of engineers and scientists after the revolutionary introduction of incandescent lamp by Thomas Edison. Although several strategies have been developed in past, none [...]

Upconversion emission properties and un-expected white light emission from Er3+/Yb3+ doped Gd2O3 nano – phosphors

Bilir G., Erguzel O., Eryurek G., Istanbul Technical University, TR

Gd2O3 nano-powders doped with Er3+ and Yb3+ were synthesized using the combustion method. X-ray diffraction and the scanning electron microscope techniques were used to estimate the crystalline sizes and the morphologies of the materials. The [...]

Fourier Transform Infrared Spectroscopy of Silicon Carbide Nanowires

Teker K., Abdurazik D., Istanbul Sehir University, TR

Silicon carbide is a wide band-gap semiconductor material with many superior properties, such as high electron mobility, high thermal conductivity, high mechanical strength, and high radiation resistance. These superior properties make SiC an excellent material [...]

Automated Continuous Flow Reactor for the Mass Production of Photoluminescent Nanoparticles

Simsek E., V. Akgun O., Heves E., Dogan L., Hocaoglu I., Dagtepe P., Sezen N., T. Ruzgar H., Kuantag Nanoteknolojiler Gelistirme ve Uretim A. S., TR

Batch and flow reactors are two most common production methods employed widely in various chemical industries. The main advantage of flow reaction systems over batch reactors is the continuous production capability. Besides, particularly for the [...]

Structural and Optical Properties of Rare Earth Nano-Crystalline Oxides Embedded in Polymethyl Methacrylate

Tabanli S., Bilir G., Erdem M., Eryurek G., Istanbul Technical University, TR

In this study, various ratio and sizes of Nd2O3, Yb2O3 and Er2O3 nano-crystalline oxides were doped into polymethyl methacrylate (PMMA) host material. PMMA is an amorphous, thermoplastic polymer with an optical transparency region from 300 [...]

Controlled Synthesis of Near IR Emitting Metal Chalcogenide Quantum Dots for the Opto-electronic Applications

Hocaoglu I., Eral Dogan L., Dagtepe P., Kuantag Nanotechnologies Development and Production Inc., TR

Studies on the synthesis of Near IR emitting Quantum Dots have increased due to their potential in fiber optic communication systems, in photovoltaic cells, in NIR detectors-cameras, in biological applications including in vitro and in [...]