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Showing 1 to 20 of 22 for “"gold substrates"”.
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Colloidal Gold as Molecular Capture Devices in Hybrid Nano/microfluidic Systems for Mass-Limited Sample Analysis
Analyte capture by the colloidal gold was demonstrated in a hybrid nano/microfluidic device designed for sequential fluid manipulations in three dimensions. A nanocapillary array membrane (NCAM) was utilized to enable efficient mixing of the gold colloid and the adsorbate in-device. Fluorescence …
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Influence of Molecular Orientation and Surface Coverage of w-Functionalized Mercaptans on Surface Acidity
… self-assembled monolayers of these molecules on gold substrates, the ability of the hydroxyl group to donate its proton was shown to depend on the hydroxyl group substitution pattern on the benzene ring through contact angle titration experiments. 3-dodecyloxymercaptophenol clearly showed …
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AFM surface force measurements between hydrophobized gold surfaces
… AFM force measurements were conducted with gold substrates hydrophobized by self-assembly of alkanethiols and xanthates of different chain lengths. The results showed long-range attractions despite the fact that the hydrophobizing agents chemisorb on gold and, hence, the adsorption layer is …
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THE MODIFICATION OF ELECTROCHEMICAL AND PHOTOELECTROCHEMICAL PROPERTIES IN THIN FILMS OF TRI- AND TETRAVALENT METAL PHTHALOCYANINES
… thin films (0.05-2.0 micron thickness) on gold, optically transparent substrates. The photoelectronic properties of these electrodes could be modified either by altering the growth conditions (i.e. rate of sublimation, cleanliness of substrate) or by dosing the thin films with either …
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Assembly and functionalization of phage onto substrates patterned by dip-pen nanolithography
… at the nanoscale may lead to useful devices. Substrates patterned with dip-pen nanolithography (DPN) serve as templates for the deposition of phage. On gold substrates, 16-mercaptohexadecanoic acid (MHA) is deposited to form patterned lines. After surface passivation and activation chemistry, …
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Two-dimensional polymer synthesis : towards a two-dimensional replicating system for nanostructures
… was studied on unpatterned thermally evaporated gold films. Raman and Fourier-transform infrared spectroscopies, as well as ellipsometry and contact angle data, indicate that amide hydrogen bonding interactions are sufficient to organize an adlayer of diacetylene-containing molecules on the …
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The formation and characterisation of micro- and nanostructured surfaces through combinations of top-down and bottom-up fabrication methodologies
… beam lithography to form chemical patterns on gold surfaces. The chemical patterns on the surface then direct the self-assembly of gold nanoparticles with complementary chemistry. Chapter 3 (From the Foundations Upwards) utilises the self-assembling ability of the nanoparticles from the …
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Electrochemical and spectroscopic analysis of collagen films and lipid bilayers on biomaterial surfaces
… Collagen was chosen as the adsorbing protein and gold as the substrate material. Capacitance measurements, polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), surface plasmon resonance spectroscopy (SPR) and ellipsometry are employed to analyze the stability and …
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Scanning probe investigations of magnetic thin films and nanostructures
… molecules have been deposited on MgO covered gold substrates and entities with the size of single molecules could be isolated and AFM images have been taken. A clear phase contrast makes the entities identifiable. In the third part of this thesis the main focus lies on the measurements of the …
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Electrodeposition and characterization of metals and metal oxides for energy conversion and storage
… introduces the fabrication of nanometer-thick gold on silicon as an inexpensive and convenient alternative to single crystal gold substrates. In addition to protecting the Si from corrosion, the Au buffer layer forms a Schottky junction with n-Si and exhibits electronic properties useful for …
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Relationship between molecular structure and surface properties of self-assembled monolayers
… for use as an adhesion promoter for metal substrates, and for corrosion protectors of the metal surface. Gold substrates modified by adsorption of 3- and 4-aminothiophenol monolayers, 3- and (4-mercaptophenyl) phthalimide (MPP) monolayers, and by reaction of the 3- and 4-aminothiophenol …
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Adsorption of Biomacromolecules onto Polysaccharide Surfaces
… adsorption from citric phosphate buffer onto gold substrates. These pectin model surfaces were used for subsequent interaction studies with xyloglucan and enzymatic degradation behavior. There is a strong correlation between the degree of esterification (DE) and film resistance to degradation …
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Nanoscale device engineering and plasmon-enhanced light – matter interactions for the characterization of 2D materials
… methods are proposed. They all employ gold nanoparticles as electrical contacts, offering both nano-sized electrodes and significant optical enhancement within the biased region, enabling the first precise, non invasive concurrent optical and electrical characterization of …
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Fabrication, characterisation, and optical applications of electrochemically deposited nanostructured IrOx films
… a template made with polystyrene spheres on gold substrates. SEM pictures show that the nanostructured IrOx films have a very ordered hexagonal structure. To our knowledge, this is the first report of templated deposition of nanostructured IrOx films and only the 2nd of fabrication of …
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Electrochemical detection of chemical warfare agents
… The cystamine conjugate 12 formed films on gold substrates, which upon deprotection of the amino group, reacted with chemical warfare agents (CWAs) mimics, such as EtSCH₂CH₂Cl (MA), a simulant for the sulfur mustard HD, and (CN)(EtO)₂P(O) (NA), a simulant for the nerve agent Tabun. Their …
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Controlled Lasing in Gallium Nitride Nanowires
… by placing individual GaN nanowires onto gold substrates. The nanowire-gold contact generates a mode-dependent loss, which can strongly attenuate high-order guiding modes and ensure single-mode operation. Additionally, polarization properties of the gallium nitride nanowire lasers are …
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Functional polymer layers with protected amines
… of DNA or other bio-template on microstructured gold contacts and which then permit a coordinated cooperation of several of these nanotemplate, e.g., within a microreactor. The immobilization of such nano-objects should be realized through functional thin polymer films which provide binding …
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Characterization of Electrochemical Interfaces by INfrared Spectroscopy
… alkoxyalkanethiol monolayers were formed on gold substrates as surface modifiers of low dielectric constant designed to influence the interfacial capacitance. Polarization modulation infrared spectroscopy (PMIRS), ellipsometry, interfacial wetting, and cyclic voltammetry were conducted to …
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Novel Applications of Scanning Electrochemical Microscopy
… of tens of microns in n-alkanethiol passivated gold substrates. Upon completing construction of the instrumentation, SECM was applied to capillary electrophoresis to accurately and reproducibly place the electrode directly above a very small capillary opening. Feedback SECM was then used to …
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Controlling Surface Chemistry on the Microscopic and Nanoscopic Scale through Photopatterned Self-Assembled Monolayers
… allows for the production of highly functional substrates for biological applications. Photolithography methods have been developed that utilize either high or low irradiation doses of 325 nm ultraviolet light. Utilizing high power led to the development of photo-induced monolayer desorption in …
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