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Gold coin

Related publications (19)

Thin-Wall Single-Crystal Gold Nanoelectrodes toward Advanced Chemical Probing and Imaging

Thin-wall metal ultramicro- and nanoelectrodes (UMEs/NEs), especially gold-based ones, are key probes for high-resolution electrochemical microscopy, biosensing, and nanoscale interfacial studies. Yet, their broader use remains limited by fragility, low detection sensitivity, and the lack of scalable fabrication methods. Here, we present a template-assisted, non-self-limited polyol-based growth strategy that realizes single-crystalline, thin-walled Au UMEs/NEs, as well as multifunctional probes, with high y

2026

High-Power Ku-Band Narrowband Subwavelength Locally Resonant Metamaterial Filter for Space Applications

This paper presents a high-power Ku-band subwavelength bandpass filter based on a volumetric locally resonant metamaterial (LRM) waveguide topology, targeting compact narrowband filters for space applications. The structure consists of a rectangular waveguide loaded with a small number of periodically arranged metallic pins operating below the cutoff frequency of the host guide. Hybridization between the evanescent TE10 mode and the local resonances creates a slow, subwavelength guided mode and a hybridizat

IEEE2026

Synthesis and host-guest chemistry of molecular cages containing gold or zirconium

The kinetic inertness and low solubility of Au3(pyrazolate)3 complexes have made it difficult to integrate them into supramolecular assemblies. In this thesis, an investigation into the dynamic combinatorial chemistry of these complexes is presented, followed by strategies for their incorporation into molecular cages and a study of the host - guest chemistry of the resulting assemblies. The first research chapter, Chapter 2, describes the constitutional dynamic chemistry of Au3(pyrazolate)3 complexes. Liga

EPFL2026

How not to get lost in the quest to publish an Open Access article?

Upon attending this training, participants should have a clear understanding of what OA is; which are the most used models (Gold, Hybrid, Green...); what are the policies at national and institutional levels and how to comply with funders’ requirements; how to recognize a predatory journal.

2022

Que Sera Consensus: Simple Asynchronous Agreement with Private Coins and Threshold Logical Clocks

It is commonly held that asynchronous consensus is much more complex, difficult, and costly than partially-synchronous algorithms, especially without using common coins. This paper challenges that conventional wisdom with que sera consensus QSC, an approach to consensus that cleanly decomposes the agreement problem from that of network asynchrony. QSC uses only private coins and reaches consensus in O(1) expected communication rounds. It relies on "lock-step" synchronous broadcast, but can run atop a thresh

2020

Deriving Brain Myelin Water Fraction Maps from Relaxometry: a Data-Driven Approach

Jean-Philippe Thiran, Jonas Richiardi

Currently, one of the gold-standard methods to obtain brain myelin water fraction (MWF) maps is the multi-echo spin-echo sequence. To overcome some of its limitations (e.g. long acquisition times), a data-driven approach for deriving MWF maps is proposed here. A general linear model (GLM) and a conditional generative adversarial network (cGAN) were trained to learn the reference MWF from T1 and T2 maps acquired in a healthy cohort. While GLM-derived maps exhibited MWF overestimation, especially in WM tissue

2019

Recovery and refining of precious metals alloys by oxi-nitrogen leaching

In recent years the demand for gold and other precious metals has increased dramatically, insomuch as in the last decade gold prices have quintupled. In the contest of the lack of trust in the traditional financial market, recovery and refining of precious metals from e-waste, automotive catalysts, and scrap jewellery and waste generated by jewellery manufacture have become increasingly more important. Controlled recovery of precious metals reduces additional waste production and helps prevent the need for

Villigen PSI, World Resources Forum, printed by Paul Scherrer Institute2015

Soft metal constructs for large strain sensor membrane

Stéphanie Lacour, Hadrien Olivier Michaud, Joan Teixidor

Thin gold films on silicone display large reversible change in electrical resistance upon stretching. Eutectic liquid metal conductors maintain bulk metal conductivity, even upon extensive elongation. When integrated together, the soft metals enable multid ...

Iop Publishing Ltd2015

Biosensor based on chemically-designed anchorable cytochrome c for the detection of H2O2 released by aquaticcells

Christian Santschi

A novel third generation biosensor was developed based on one-shot adsorption of chemically-modified cytochrome c (cyt c) onto bare gold electrodes. In contrast to the classic approach which consists of attaching cyt c onto an active self-assembled monolayer (SAM) priory chemisorbed on gold, here short-chain thiol derivatives (mercaptopropionic acid, MPA) were chemically introduced on cyt c protein shell via its lysine residues enabling the very fast formation ( < 5 min) of an electroactive biological self-

Elsevier2013

Influence of gold particle size on the photocatalytic activity for acetone oxidation of Au/TiO2 catalysts prepared by dc-magnetron sputtering

Francis Lévy

Two series of Au/TiO2 materials with different gold content have been prepared by dc-magnetron sputtering on ceramic shaped pure anatase or Degussa P25 TiO2. The time of deposition was varied between 1 and 20 min in order to obtain different thickness and ...

2011

Mechanistic studies on two dinuclear organogold(III) compounds showing appreciable antiproliferative properties and a high redox stability

Angela Casini

Two dinuclear oxo-bridged organogold(III) compounds, namely [(N,N,C)(2)Au-2(mu-O)]PF6 (with N,N,CH = 6-(1-methylbenzyl)-2,2'-bipyridine, Au(2)O1; or 6-(1,1-dimethylbenzyl)-2,2'-bipyridine, Au(2)O2), were previously prepared and characterised. Their so ...

2011

Optical transmission properties of corrugated nanoscale hole arrays in thin gold films

We present the characterization of short-range ordered hexagonal arrays of subwavelength holes in thin gold films. The hole arrays are fabricated by a low-cost technique using convectively self-assembled polystyrene beads as an initial pattern template. Our results suggest that corrugated, short-range ordered hole arrays allow the excitation of resonant surface plasmons. This opens the door to inexpensive, large- scale and high throughput fabrication of nanophotonic devices.

2010

Large area hole arrays fabricated by a templating method for refractive index sensing

Subwavelength hole arrays in thin gold films were fabricated in a low-cost and parallel fabrication process on 2" wafers. Polystyrene beads were used as an initial pattern template which is transferred into a thin gold film by sputter etching. Hole arrays with two different periodicities were characterized in optical transmission measurements in air and in liquids of varying refractive index. Despite the conical hole shape and long-range disorder of the arrays, the optical transmission spectra are similar t

2009

Reversible immobilization of peptides: Surface modification and in situ detection by attenuated total reflection FTIR spectroscopy

Horst Arthur Vogel, Patrik Willi Hoffmann, Wolf-Peter Ulrich, Per Rigler, Michael Mayer

A generic method is described for the reversible immobilization of polyhistidine-bearing polypeptides and proteins on attenuated total reflecting (ATR) sensor surfaces for the detection of biomol. interactions by FTIR spectroscopy. Nitrilotriacetic acid (NTA) groups are covalently attached to self-assembled monolayers of either thioalkanes on gold films or mercaptosilanes on silicon dioxide films deposited on germanium internal reflection elements. Complex formation between Ni2+ ions and NTA groups activate

2003

Focused electron beam induced deposition of gold

Elyahou Kapon, Patrik Willi Hoffmann, Benjamin Dwir, Klaus Leifer, Ivo Utke

Codeposition of hydrocarbons is a severe problem during focused electron beam writing of pure metal nanostructures. When using organometallic precursors, a low metal content carbonaceous matrix embedding and separating numerous nanosized metal clusters is formed. In this work, we present a new and easy approach to obtain high purity gold lines: the use of inorganic PF3AuCl as a precursor. Electrical resistivities as low as 22 µOhms cm at 295 K (ten times the bulk Au value) were obtained. This is to our know

American Vacuum Society2000

Mineralization of gold in block copolymer micelles

Ultrasmall gold particles have been prepared inside the micelles of polystyrene-block-poly(ethylene oxide) and polystyrene-block-poly(2-vinylpyridine) in toluene. Starting point was the formation of a thermodynamically stable dispersion of HAuCl4 or LiAuCl4 in the inverse micelles of the block copolymer which were treated with hydrazine or pyrrole. Analysis of the effect of the reduction agent on the stability of the micelles yielded a simple model for the transformation process involv

1997

Direct Observation of Self-Assembled Monolayers, Ion Complexation, and Protein Conformation at the Gold/Water Interface: An FTIR Spectroscopic Approach

Horst Arthur Vogel

A simple approach to the in situ measurement of IR spectra of self-assembled monolayers (SAMs) on gold in an aq. environment is described. A thin gold film (3-5 nm) on the surface of a germanium internal reflection element is used as a substrate for the self-assembly of a monolayer of a chelating thioalkane. High signal-to-noise spectra are obtained, allowing identification of the chem. groups present in the SAM. Complexation of ions by the SAM can be monitored, and the secondary conformation of His-tagged

1997

Surface engineering: optimization of antigen presentation in self-assembled monolayers

Horst Arthur Vogel

The formation of self-assembled monolayers (SAMs) on gold surfaces contg. an antigenic peptide (NANP)6 and HS(CH2)11OH, and the specific binding of a monoclonal antibody to these layers were investigated by surface plasmon resonance (SPR). Peptides were synthesized by solid-state phase synthesis and were linked either to cysteine or to an alkyl-thiol to allow covalent attachment to gold. The content of the peptide in the SAMs was systematically varied, and the binding properties of the monoclonal antibody w

1996

Scanning Force Microscopy Characterization of Langmuir-Blodgett Films of Sulfur-Bearing Lipids on Mica and Gold

Horst Arthur Vogel

Physisorbed and covalently bound Langmuir-Blodgett (LB) monolayers of sulfur-bearing lipids on mica and on gold substrates, resp., have been studied. Scanning force microscopy, in topog. and friction modes as well as in contact and non-contact modes have been used to investigate these films in the region of coexisting phases. For the first time, a detailed and complex internal structure of solid-analogous monolayer domains, reflecting their sym. morphol., has been obsd. Comparisons of physisorbed monolayers

1995

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