Browsing Institute of Materials Science and Nanotechnology by Title

Advances in the LED Materials and Architectures fro Energy-Saving Solid State Lighting towards Lighting Revolution

Tan, S. T.; Sun, X. W.; Demir, H. V.; DenBaars, S. P. (IEEE, 2012-04)

In this paper, we review the recent developments (in years 2010–2011) of energysaving solid-state lighting. The industry of white light-emitting diodes (LEDs) has made significant progress, and today, white LED market ...

Advantages of the Blue InGaN/GaN Light-Emitting Diodes with an AlGaN/GaN/AlGaN Quantum Well Structured Electron Blocking Layer

Ju, Z. G.; Liu, W.; Zhang, Z. H.; Tan, S. T.; Ji, Y.; Kyaw, Z.; Zhang, X. L.; Lu, S. P.; Zhang, Y. P.; Zhu, B.; Hasanov, N.; Sun, X. W.; Demir, H. V. (American Chemical Society, 2014-03-21)

InGaN/GaN light-emitting diodes (LEDs) with p-(AlGaN/GaN/AlGaN) quantum well structured electron blocking layer (QWEBL) are designed and grown by a metal− organic chemical-vapor deposition (MOCVD) system. The proposed QWEBL ...

All-chalcogenide glass omnidirectional photonic band gap variable infrared filters

Kondakci, H. E.; Yaman, M.; Koylu, O.; Dana, A.; Bayindir, M. (American Institute of Physics, 2009)

We report on the design, fabrication, and characterization of spatially variable infrared photonic band gap filter that consists of thermally evaporated, high refractive index contrast, amorphous chalcogenide glass ...

Amplified Spontaneous Emission and Lasing in Colloidal Nanoplatelets

Guzelturk, B.; Kelestemur, Y.; Olutas, M.; Delikanli, S.; Demir, H. V. (American Chemical Society, 2014-07)

Colloidal nanoplatelets (NPLs) have recently emerged as favorable light-emitting materials, which also show great potential as optical gain media due to their remarkable optical properties. In this work, we systematically ...

Amyloid Inspired Self-Assembled Peptide Nanofibers

Cinar, G.; Ceylan, H.; Urel, M.; Erkal, T. S.; Tekin, E. D.; Tekinay, A. B.; Dana, A.; Guler, M. O. (American Chemical Society, 2012-09-17)

Amyloid peptides are important components in many degenerative diseases as well as in maintaining cellular metabolism. Their unique stable structure provides new insights in developing new materials. Designing bioinspired ...

Amyloid-like peptide nanofiber templated titania nanostructures as dye sensitized solar cell anodic materials

Acar, H.; Garifullin, R.; Aygun, L. E.; Okyay, A. K.; Guler, M. O. (Royal Society of Chemistry, 2013)

One-dimensional titania nanostructures can serve as a support for light absorbing molecules and result in an improvement in the short circuit current (Jsc) and open circuit voltage (Voc) as a nanostructured and high-surface-area ...

Analysis of apoplastic and symplatsic antioxidant system in shallot leaves: Impacts of weak static electric and magnetic field

Cakmak, T.; Cakmak, Z. E.; Dumlupinar, R.; Tekinay, T. (Elsevier, 2012-07-15)

Impacts of electric and magnetic fields (EFs and MFs) on a biological organism vary depending on their application style, time, and intensities. High intensity MF and EF have destructive effects on plants. However, at ...

Anisotropic Emission from Multilayered Plasmon Resonator Nanocomposites of Isotropic Semiconductor Quantum Dots

Ozel, T.; Nizamoglu, S.; Sefunc, M. A.; Samarskaya, O.; Ozel, I. O.; Mutlugun, E.; Lesnyak, V.; Gaponik, N.; Eychmuller, A.; Gaponenko, S. V.; Demir, H. V. (American Chemical Society, 2011)

We propose and demonstrate a nanocomposite localized surface plasmon resonator embedded into an artificial three-dimensional construction. Colloidal semiconductor quantum dots are assembled between layers of metal ...

Antibacterial electrospun nanofibers from triclosan cyclodextrin inclusion complexes

Celebioglu, A.; Umu, O. C. O.; Tekinay, T.; Uyar, T. (Elsevier, 2014-04-01)

The electrospinning of nanofibers (NF) from cyclodextrin inclusion complexes (CD-IC) with an antibacterial agent (triclosan) was achieved without using any carrier polymeric matrix. Polymer-free triclosan/CD-IC NF were ...

Arrays of indefinitely long uniform nanowires and nanotubes

Yaman, M.; Khudiyev, T.; Ozgur, E.; Kanik, M.; Aktas, O.; Ozgur, E. O.; Deniz, H.; Korkut, E.; Bayindir, M. (Nature Publishing Group, 2011-06-12)

Nanowires are arguably the most studied nanomaterial model to make functional devices and arrays(1,2). Although there is remarkable maturity in the chemical synthesis of complex nanowire structures(3,4), their integration ...

Assembly Kinetics of Nanocrystals via Peptide Hybridization

Seker, U. O. S.; Zengin, G.; Tamerler, C.; Sarikaya, M.; Demir, H. V. (American Chemical Society, 2011-03)

The assembly kinetics of colloidal semiconductor quantum dots (QDs) on solid inorganic surfaces is of fundamental importance for implementation of their solid-state devices. Herein an inorganic binding peptide, silica ...

Asymmetric transmission of linearly polarized waves and polarization angle dependent wave rotation using a chiral metamaterial

Mutlu, M.; Akosman, A. E.; Serebryannikov, A. E.; Ozbay, E. (Optical Society of America, 2011-07-18)

An electrically thin chiral metamaterial structure composed of four U-shaped split ring resonator pairs is utilized in order to realize polarization rotation that is dependent on the polarization of the incident wave at ...

Atomic layer deposition of GaN at low temperatures

Ozgit, C.; Donmez, I.; Alevli, M.; Biyikli, N. (American Vacuum Society, 2012-01/02)

The authors report on the self-limiting growth of GaNthin films at low temperatures. Films were deposited on Si substrates by plasma-enhanced atomic layer deposition using trimethylgallium (TMG) and ammonia (NH3) as the ...

Attractive versus Repulsive Excitons Interactions of Colloidal Quantum Dots Control Blue- to Red-Shifting (and Non-shifting) Amplified Spontaneous Emission

Cihan, A. F.; Kelestemur, Y.; Guzelturk, B.; Yerli, O.; Kurum, U.; Yaglioglu, H. G.; Elmali, A.; Demir, H. V. (American Chemical Society, 2013-11-21)

Tunable, high-performance, two-photon absorption (TPA)-based amplified spontaneous emission (ASE) from near-unity quantum efficiency colloidal quantum dots (CQDs) is reported. Besides the absolute spectral tuning of ASE, ...

Au/TiO2 nanorod-based Schottky-type UV photodetectors

Karaagac, H.; Aygun, L. E.; Parlak, M.; Ghaffari, M.; Biyikli, N.; Okyay, A. K. (Wiley, 2012-11)

TiO2 nanorods (NRs) were synthesized on fluorine-doped tin oxide (FTO) pre-coated glass substrates using hydrothermal growth technique. Scanning electron microscopy studies have revealed the formation of vertically-aligned ...

A baseball-bat-like CdTe/TiO<sub>2</sub> nanorods-based heterojunction core-shell solar cell

Karaagac, H.; Parlak, M.; Aygun, L. E.; Ghaffari, M.; Biyikli, N.; Okyay, A. K. (Elsevier, 2013-08)

Rutile TiO2 nanorods on fluorine-doped thin oxide glass substrates via the hydrothermal technique were synthesized and decorated with a sputtered CdTe layer to fabricate a core–shell type n-TiO2/p-CdTe solar cell. Absorbance ...

Bifunctional Highly Fluorescent Hollow Porous Microspheres Made of BaMoO4:Pr3+ Nanocrystals via a Template-Free Synthesis

Yang, X.; Zhou, Y.; Yu, X.; Demir, H. V.; Sun, X. W. (The Royal Society of Chemistry, 2011-04-20)

We report a bifunctional hollow porous microsphere composed of single-component BaMoO4 : Pr3+ nanocrystals by a facile template-free synthesis. All the as-synthesized hollow microspheres are well-dispersed with a diameter ...