Open Access. Powered by Scholars. Published by Universities.®
Nanoscience and Nanotechnology Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- ATOMIC-ABSORPTION-SPECTROMETRY; GAAS SURFACE RECOMBINATION; GALLIUM-ARSENIDE; MONOLAYERS; MOLECULES; SILICON; FUNCTIONALIZATION; ALKANETHIOLS; ALUMINUM; GAP(001) (1)
- ATTACHMENT; MOLECULES; ADHESION; LIGANDS; CELLS (1)
- BUCKLING DYNAMICS; ELASTIC MEMBRANES; THERMAL-EXPANSION; GRAPHITE; SURFACE; FILMS; GRAPHITIZATION; 6H-SIC(0001); TEMPERATURE; SHEETS (1)
- FUNDAMENTAL-ASPECTS; SOLID-SURFACES; NACL; ADSORPTION; ADSORBATES (1)
- INDIUM-PHOSPHIDE; GAAS-SURFACES; PASSIVATION; MICROSCOPY; CHEMISORPTION; ACCUMULATION; ALKANETHIOLS; MOLECULES; AMMONIA; THIOLS (1)
Articles 1 - 9 of 9
Full-Text Articles in Nanoscience and Nanotechnology
Electrodeposition Study Of Odn : Swcnt Hybrids On Gold Substrates, Roya Lahiji, Bridget Dolash, Jennifer Mcdonald, Dmitry Zemlyanov, Donald Bergstrom, R. Reifenberger
Electrodeposition Study Of Odn : Swcnt Hybrids On Gold Substrates, Roya Lahiji, Bridget Dolash, Jennifer Mcdonald, Dmitry Zemlyanov, Donald Bergstrom, R. Reifenberger
Dmitry Yurievich Zemlyanov
Sonication of short single-stranded DNA (oligodeoxyribonucleotide; ODN) with Single-Walled Carbon Nanotubes (SWCNTs) greatly facilitates the dispersion of SWCNTs from entangled ropes in an aqueous solution, creating ODN:SWCNT hybrids. Electrodeposition has been investigated to determine if well-dispersed ODN :SWCNT hybrids on a metal substrate can be created. Preliminary studies indicate that electrodeposition using an Au substrate held at +0.5 V produces ODN: SWCNT hybrids that are uniformly deposited across the Au substrate. This result can be compared to samples produced by drop casting and evaporation techniques which yield a thick tangled mat of ODN :SWCNT hybrids across the substrate. The resulting …
Controllable Surface Expression Of Bioactive Peptides Incorporated Into A Silica Thin Film Matrix, Sabrina Jedlicka, Jenna Rickus, Dmitry Zemlyanov
Controllable Surface Expression Of Bioactive Peptides Incorporated Into A Silica Thin Film Matrix, Sabrina Jedlicka, Jenna Rickus, Dmitry Zemlyanov
Dmitry Yurievich Zemlyanov
Mammalian cell culture platforms often require biomolecular modification to enhance cell adhesion and proliferation, Often, these modifications are performed using self-assembled monolayers or whole protein coatings, Such its collagen. These protocols are inherently useful but generally suffer from repeatability. Undesirable conditions during self-assembly can lead to complications in the surface presentation of the biological ligands. Whole proteins are often unstable and derived from animal sources, making them less attractive for tissue engineering applications. As the biological effect of the material often depends strongly on the concentration of the integrated ligand(s), any complication due to synthesis or stability can lead to …
Dissociation Of Water On The Surface Of Organic Salts Studied By X-Ray Photoelectron Spectroscopy, Peter Guerrieri, Dmitry Zemlyanov, Lynn Taylor
Dissociation Of Water On The Surface Of Organic Salts Studied By X-Ray Photoelectron Spectroscopy, Peter Guerrieri, Dmitry Zemlyanov, Lynn Taylor
Dmitry Yurievich Zemlyanov
Water dissociation has important implications for numerous chemical processes. Although extensively studied on metals and to some extent on inorganic salts, this phenomenon has not yet been shown to occur on organic surfaces. Herein, the ability of two crystalline organic hydrochloride salts to induce water dissociation at their surface was demonstrated. Using a modified X-ray photoelectron spectroscopy setup, the oxygen lacking crystalline organic salts were exposed to high water vapor pressures within an environment sealed from ambient air. Thus, the O(1s) peak resulting from exposure to water vapor at room temperature could be unambiguously assigned to dissociated water, a phenomenon …
Assessment Of The Passivation Capabilities Of Two Different Covalent Chemical Modifications On Gap(100), David Richards, Dmitry Zemlyanov, Albena Ivanisevic
Assessment Of The Passivation Capabilities Of Two Different Covalent Chemical Modifications On Gap(100), David Richards, Dmitry Zemlyanov, Albena Ivanisevic
Dmitry Yurievich Zemlyanov
Gallium phosphide is a semiconductor material that can be used for the fabrication of optoelectronic devices. The report compares the ability of two similar organic molecules to form covalent bonds with the GaP(100) surface. Undecenoic acid (UDA) is a terminal alkene that can potentially form Ga-C bonds, and mercaptoundecanoic acid (MUA) is a thiol that can be used to generate Ga-S bonds. The chemical passivation capabilities of the functionalized surfaces exposed to different media were investigated by contact angle measurements, atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). Toxicity levels, which are important for sensing applications. were evaluated by …
Dna Immobilization On Gap(100) Investigated By Kelvin Probe Force Microscopy, David Richards, Dmitry Zemlyanov, Rafay Asrar, Yena Chokshi, Emily Cook, Thomas Hinton, Xinran Lu, Viet Nguyen, Neil Patel, Jonathan Usher, Sriram Vaidyanathan, David Yeung, Albena Ivanisevic
Dna Immobilization On Gap(100) Investigated By Kelvin Probe Force Microscopy, David Richards, Dmitry Zemlyanov, Rafay Asrar, Yena Chokshi, Emily Cook, Thomas Hinton, Xinran Lu, Viet Nguyen, Neil Patel, Jonathan Usher, Sriram Vaidyanathan, David Yeung, Albena Ivanisevic
Dmitry Yurievich Zemlyanov
Understanding changes in the properties of semiconductor materials after immobilization of biomolecules on the surface is essential for the fabrication of well-tuned and programmable devices. The work examines changes in the properties of gallium phosphide (GaP) after modification with an organic linker, a single stranded DNA, and its complementary strand. We investigated changes in surface potential with Kelvin probe force microscopy (KPFM). Analysis revealed that a more ordered adlayer of ssDNA was present when a lower concentration of linker molecule was used. KPFM data combined with coverage data obtained from X-ray photoelectron spectroscopy (XPS) further confirmed this result. Successful hybridization …
Electron Spectroscopy A New Window Opens, Dmitry Zemlyanov
Electron Spectroscopy A New Window Opens, Dmitry Zemlyanov
Dmitry Yurievich Zemlyanov
No abstract provided.
Afm Study Of Ridges In Few-Layer Epitaxial Graphene Grown On The Carbon-Face Of 4h-Sic(000(1)Over-Bar), Gyan Prakash, Michael Capano, Michael Bolen, Dmitry Zemlyanov, R. Reifenberger
Afm Study Of Ridges In Few-Layer Epitaxial Graphene Grown On The Carbon-Face Of 4h-Sic(000(1)Over-Bar), Gyan Prakash, Michael Capano, Michael Bolen, Dmitry Zemlyanov, R. Reifenberger
Dmitry Yurievich Zemlyanov
A characterization of the graphitic overlayer that forms on 4H-SiC(000 (1) over bar) substrates heated for ten minutes to temperatures T > 1350 degrees C under vacuum conditions has been performed. X-ray photoelectron spectroscopy of the C-face reveals the presence of graphitic carbon with a thickness that increases with growth temperature. Parallel atomic force microscope (AFM) studies find a mesh-like network of ridges with high curvature that bound atomically flat, tile-like facets of few-layer graphene (FLG). By imaging the network that develops on FLG, it is possible to map out the regions where the elastic energy is concentrated.
Temperature-Induced Modifications Of Pdzn Layers On Pd(111), W Stadlmayr, Ch Rameshan, C Weilach, H Lorenz, M Haevecker, R Blume, T Rocha, D Teschner, A Knop-Gericke, Dmitry Zemlyanov, S Penner, R Schloegl, G Rupprechter, B Kloetzer, N Memmel
Temperature-Induced Modifications Of Pdzn Layers On Pd(111), W Stadlmayr, Ch Rameshan, C Weilach, H Lorenz, M Haevecker, R Blume, T Rocha, D Teschner, A Knop-Gericke, Dmitry Zemlyanov, S Penner, R Schloegl, G Rupprechter, B Kloetzer, N Memmel
Dmitry Yurievich Zemlyanov
Ultrathin PdZn surface alloys on Pd(111) are model systems well-suited for obtaining a microscopic understanding of the mechanisms of Pd/Zn-based catalysis for methanol steam reforming. The temperature-induced compositional and structural changes of these alloy films are investigated in the catalytically relevant temperature range. Heating of multilayer Zn films to 500 K results in the formation of multilayer PdZn alloy films with surface and near-surface composition close to 1:1. In the temperature regime above 550 K the subsurface layers deplete quickly in Zn due to diffusion of Zn atoms into the Pd bulk. In contrast, the composition of the surface layer …
Characterization Of Amino Acid Adlayers On Inas Surfaces Using X-Ray Photoelectron Spectroscopy, John Slavin, Upasana Jarori, Dmitry Zemlyanov, Albena Ivanisevic
Characterization Of Amino Acid Adlayers On Inas Surfaces Using X-Ray Photoelectron Spectroscopy, John Slavin, Upasana Jarori, Dmitry Zemlyanov, Albena Ivanisevic
Dmitry Yurievich Zemlyanov
Removal of surface oxide layers and the prevention of their reformation is an essential step in the use of Ill-V semiconductor technologies. Highlighted here are data exploring the use of amino acid (AA) self-assembled monolayers (SAMs) to block the pre-growth of oxides on indium arsenide surfaces. Three different AAs were used: lysine, aspartic acid, and cysteine. The adlayers were characterized by atomic force microscopy (AFM), Raman, and angle resolved X-ray photoelectron spectroscopy (ARXPS). AFM data suggest that the AA functional groups affect the packing and orientation of the molecules on the surfaces, reinforced by contact angle data. Raman data provide …