Department of Chemistry

Band-Bending at Buried SiO2/Si Interface as Probed by XPS

Copuroglu, M.; Sezen, H.; Opila, R. L.; Suzer, S. (American Chemical Society, 2013)

X-ray photoelectron spectroscopy is used to probe the photoinduced shifts in the binding energies of Si2p, O1s, and C1s of the SiO2/Si interfaces of a number of samples having oxide and/or thin organic layers on top of ...

Spectroscopic investigation of species arising from CO chemisorption on titania-supported manganese

Kantcheva, M.; Kucukkal, M. U.; Suzer, S. (Elsevier, 2000-02-15)

The nature of manganese species on the surface of TiO2 (anatase) has been investigated by means of XPS, visible absorption spectroscopy, and FTIR spectroscopy of adsorbed CO. The catalysts were prepared by ion-exchange ...

The effect of anions of transition metal salts on the structure of modified mesostructured silica films and monoliths

Demirors, A. F.; Arslan, M.; Dag, O. (Elsevier, 2007-01-05)

The structure of the preformed LC mesophase of water:transition metal salt ([M(H2O)6]X2):acid (HX):oligo(ethylene oxide) (or Pluronics):tetramethylorthosilicate (TMOS) mixture during hydrolysis and partial polymerization ...

Gate-Tunable Photoemission from Graphene Transistors

Copuroglu, M.; Aydogan, P.; Polat, E. O.; Kocabas, C.; Suzer, S. (American Chemical Society, 2014)

In this Letter, we report gate-tunable X-ray photoelectron emission from back-gated graphene transistors. The back-gated transistor geometry allows us to study photoemission from graphene layer and the dielectric substrate ...

Designing Excited States: Theory-Guided Access to Efficient Photosensitizers for Photodynamic Action

Cakmak, Y.; Kolemen, S.; Duman, S.; Dede, Y.; Dolen, Y.; Kilic, B.; Kostereli, Z.; Yildirim, L. T.; Dogan, A. L.; Guc, D.; Akkaya, E. U. (Wiley Online Library, 2011-01-19)

The in silico design of tetraradical S 1 states was validated experimentally through synthesis, followed by characterization including phosphorescence measurements, use of trap molecules, and cell culture studies, leading ...

Tunable surface plasmon resonance on an elastomeric substrate

Olcum, S.; Kocabas, A.; Ertas, G.; Atalar, A.; Aydinli, A. (Optical Society of America, 2009)

In this study, we demonstrate that periods of metallic gratings on elastomeric substrates can be tuned with external strain and hence are found to control the resonance condition of surface plasmon polaritons. We have ...

Non-radiative resonance energy transfer in bi-polymer nanoparticles of fluorescent conjugated polymers

Ozel, I. O.; Ozel, T.; Demir, H. V.; Tuncel, D. (Optical Society of America, 2010-01-18)

his work demonstrates the comparative studies of non-radiative resonance energy transfer in bi-polymer nanoparticles based on fluorescent conjugated polymers. For this purpose, poly[(9,9-dihexylfluorene) (PF) as a donor ...

An experimental and theoretical examination of the effect of sulfur on the pyrolytically grown carbon nanotubes from sucrose-based solid state precursors

Kucukayan, G.; Ovali, R.; Ilday, S.; Baykal, B.; Yurdakul, H.; Turan, S.; Gulseren, O.; Bengu, E. (Elsevier, 2011-02)

Multi-walled carbon nanotubes (MWCNTs) were synthesized through pyrolysis of the sulfuric acid-carbonized byproduct of sucrose. While the presence of sulfur in the reaction media has a key role in the formation and population ...

Identification, Stability, and Reactivity of Nox Species Adsorbed on Titania-Supported Manganese Catalysts

Kantcheva, M. (Elsevier, 2001-12-10)

The nature of the NOx species obtained on NO adsorption and its coadsorption with O2 at room temperature on TiO2 and MnOx/TiO2 catalysts with two different manganese loadings has been studied by means ofin situFourier ...

Towards Unimolecular Luminescent Solar Concentrators: Bodipy-Based Dendritic Energy-Transfer Cascade with Panchromatic Absorption and Monochromatized Emission

Bozdemir, O. A.; Erbas Cakmak, S.; Ekiz, Okan O.; Dana, A.; Akkaya, E. U. (Wiley, 2011)

A polymer-embedded dendritic, bodipy-based panchromatic absorber with a built-in energy gradient concentrates incident solar radiation at a terminal chromophore, resulting in a monochromatized emission directed to the sides ...

Designing Bodipy-based Probes for Fluorescence Imaging of beta-amyloid Plaques

Sozmen, F.; Kolemen, S.; Kumada, H. O.; Ono, M.; Saji, H.; Akkaya, E. U. (Royal Society of Chemistry, 2014)

Styryl-congutated BODIPY dyes which are structurally similar to known A beta peptide binding dyes, were designed and synthesized. The binding is accompanied by a large increase in the emission intensity in all cases, ...

NOx storage and reduction pathways on zirconia and titania functionalized binary and ternary oxides as NOx storage and reduction (NSR) systems

Say, Z.; Tohumeken, M.; Ozensoy, E. (Elsevier, 2014-08-01)

Binary and ternary oxide materials, ZrO2/TiO2 (ZT) and Al2O3/ZrO2/TiO2 (AZT), as well as their Pt-functionalized counterparts were synthesized and characterized via XRD, Raman spectroscopy, BET, in situ FTIR and TPD ...

Periodic Mesoporous Hydridosilica-Synthesis of an "Impossible" Material and its Thermal Transformation into Brightly Photoluminescent Periodic Mesoporous Nanocrystal Silicon-Silica Composite

Xie, Z.; Henderson, E. J.; Dag, O.; Wang, W.; Lofgreen, J. E.; Kubel, C.; Scherer, T.; Brodersen, P. M.; Gu, Z. Z.; Ozin, G. A. (American Chemical Society, 2011)

There has always been a fascination with "impossible" compounds, ones that do not break any rules of chemical bonding or valence but whose structures are unstable and do not exist. This instability can usually be rationalized ...