A5047229074- Force Microscopy Techniques and Applications
- Mechanical and Optical Resonators
- Near-Field Optical Microscopy
- Advanced MEMS and NEMS Technologies
- Planetary Science and Exploration
- Integrated Circuits and Semiconductor Failure Analysis
- Nanofabrication and Lithography Techniques
- Photonic and Optical Devices
- Electron and X-Ray Spectroscopy Techniques
- Surface and Thin Film Phenomena
- Microfluidic and Bio-sensing Technologies
- Microfluidic and Capillary Electrophoresis Applications
- Advanced Surface Polishing Techniques
- Osteoarthritis Treatment and Mechanisms
- Advancements in Photolithography Techniques
- Electrowetting and Microfluidic Technologies
- Molecular Junctions and Nanostructures
- Analytical Chemistry and Sensors
- Advanced Materials Characterization Techniques
- Optical Coatings and Gratings
- Nanopore and Nanochannel Transport Studies
- Astro and Planetary Science
- Photonic Crystals and Applications
- Nanowire Synthesis and Applications
- Adhesion, Friction, and Surface Interactions
Delft University of Technology
2015-2024
Center for Biomolecular Nanotechnologies
2019
Italian Institute of Technology
2019
Institute of Photonic Sciences
2018
University of Neuchâtel
2001-2011
École Polytechnique Fédérale de Lausanne
2009
ETH Zurich
2009
University of Basel
1988-2006
Swiss Center for Electronics and Microtechnology (Switzerland)
2001
IBM (United States)
1991-1996
Phoenix Ascending The mission landed on Mars in March 2008 with the goal of studying ice-rich soil planet's northern arctic region. included a robotic arm, camera attached to it, capacity excavate through ice layer beneath scoop up and water samples, deliver them combination other instruments—including wet chemistry lab high-temperature oven combined mass spectrometer—for chemical geological analysis. Using this setup, Smith et al. (p. 58 ) found at depths 5 15 centimeters, Boynton 61...
The potentiostatic electrochemical template synthesis of nanowires (Ni, Co, Cu, Au, and polyporrole) in polycarbonate track-etched membranes with nominal pore diameters dN between 10 200 nm is studied. Along the wire cross section found to vary: diameter, which argued directly reflect observed (for all deposits) be substantially larger middle than at both ends. Therefore, pores are not cylindrical constant cross-section, general, but appear "cigarlike". Inside membrane, wider by up a factor...
The Phoenix microscopy station, designed for the study of Martian dust and soil, consists a sample delivery system, an optical microscope, atomic force microscope. combination microscopies facilitates features from millimeter to nanometer scale. Light‐emitting diode illumination allows full color imaging samples as well ultraviolet‐induced visible fluorescence. microscope uses array silicon tips can operate in both static dynamic mode.
We report the detection of protein molecules with nanofabricated pores using resistive pulse sensing method. A 20-nm-thick silicon nitride membrane a pore measuring about 55nm in diameter separated an electrolyte cell into two compartments. Current spike trains were observed when bovine serum albumin (BSA) was added to negatively biased compartment. The magnitude spikes corresponded particles 7–9nm (the size BSA molecule) passing through pore. This suggests that current blockages caused by...
Nanofabricated pores in 20 nm-thick silicon nitride membranes were used to probe various protein analytes as well perform an antigen−antibody binding assay. A two-compartment electrochemical cell was separated by a single nanopore, 28 nm diameter. Adding proteins one compartment caused current perturbations the ion flowing through pore. These correlated with both charge and size of or protein−protein complex. The potential this nanotechnology for studying interactions is highlighted...
Theoretical calculations have predicted that extreme strains (>10%) in graphene would result novel applications. However, up to now the highest reported strain reached ∼1.3%. Here, we demonstrate uniaxial >10% by pulling using a tensile-MEMS. To prevent it from slipping away was locally clamped with epoxy femtopipette. The results were analyzed Raman spectroscopy and optical tracking. Furthermore, analysis proved process be reversible nondestructive for graphene.
The Poisson's ratio and elastic modulus are two parameters determining the behavior of biomaterials. While effects on cell response is widely studied, very little known regarding ratio. micro-architecture meta-biomaterials determines not only but also several other that influence response, such as porosity, pore size, effective modulus. It is, therefore, challenging to isolate from those micro-architectural parameters. Here, we computationally design with controlled ratios, ranging between...
Phoenix, the first Mars Scout mission, capitalizes on large NASA investments in Polar Lander and Surveyor 2001 missions. On 4 August 2007, Phoenix was launched to from Cape Canaveral, Florida, a Delta 2 launch vehicle. The heritage derived canceled lander with science payload inherited MPL instruments gives significant advantages. To manage, build, test spacecraft its instruments, partnership has been forged between Jet Propulsion Laboratory, University of Arizona (home institution principal...
[1] The particle size distribution (PSD) of a Martian soil sample, useful indicator the underlying formation processes, has been determined using optical and atomic-force microscopy data acquired by Phoenix Mars lander. In particular, presence fraction clay-sized particles in PSD reflects extent aqueous interaction with soil. Two populations have identified for sample: Larger, mostly rounded grains; small reddish fines, notably very low mass proportion clay-size range below 2μm. These fines...
Nanometer scale structures have been produced on atomically flat surfaces of metallic glasses using the scanning tunneling microscope in mode with enhanced local current densities and strong electric fields. Depending field diffusion, crystallization glassy state or Taylor cone formation locally molten surface can occur. These provide a potential means studying behavior matter at nanometer dimensions.
The size-dependent elastic behavior of silicon nanocantilevers and nanowires, specifically the effective Young's modulus, has been determined by experimental measurements theoretical investigations. size dependence becomes more significant as devices scale down from micro- to nano-dimensions, which mainly attributed surface effects. However, discrepancies between computational investigations show that there could be other influences besides In this paper, we try determine what extent...
The optical microscope onboard the Phoenix spacecraft has returned color images (4 μ m pixel −1 ) of soils that were delivered to and held on various substrates. A preliminary taxonomy soil particles, based color, size, shape, identifies following particle types [generic names in brackets]: (1) reddish fines, mostly unresolved, are spectrally similar (though slightly darker than) global airborne dust [ red fines ], (2) silt‐ sand‐sized brownish grains brown sand (3) black (4) small amounts...
There is a high demand for novel flexible micro-devices energy harvesting from low-frequency and random mechanical sources. The research of new functional designs required to strategically enhance the performances increase control on flexibility. In this work we report fabrication characterization bi-stable statically balanced thin-film piezoelectric transducers based Aluminum Nitride (AlN). device consists layer sandwiched between two thin Molybdenum electrodes that were deposited Kapton...
Dynamic atomic force microscopy (AFM) is a key platform that enables topological and nanomechanical characterization of novel materials. This achieved by linking the nanoscale forces exist between AFM tip sample to specific mathematical functions through modeling. However, main challenge in dynamic quantify these without use complex models are routinely used explain physics tip-sample interaction. Here, we make machine learning data science characterize purely from experimental with...
We have studied superconductor/normal-metal/superconductor $(\mathrm{SNS})$ junctions consisting of short Au or Cu wires between Nb Al banks. The based display inherent electron heating effects induced by the high thermal resistance $\mathrm{NS}$ boundaries. show in addition subharmonic gap structures differential conductance $dI/dV$ and a pronounced peak excess noise at very low voltages V. suggest that is caused fluctuations supercurrent onset Josephson coupling superconducting At...
High-resolution near-field optical imaging with microfabricated probes is demonstrated. The are made from solid quartz tips fabricated at the end of silicon cantilevers and covered a 60-nm-thick aluminum film. Transmission electron micrographs indicate continuous layer tip apex. A specially designed instrument combines advantages beam-deflection force microscopy. Near-field data latex bead projection patterns in transmission single fluorophores have been obtained constant-height mode. An...
This paper describes the characterization and application of electrically insulated conductive tips mounted on a cantilever for use in an atomic force microscope operated liquid. These multifunctional probes were microfabricated designed measurements biological samples buffer solution, but they can also be employed electrochemical applications, particular scanning microscopy. The silicon nitride based cantilevers had spring constant ≤0.1 N m−1 tip, which was except at apex. core tip...
A combined atomic force and scanning electrochemical microscope probe is presented. The electrically insulated except at the very apex of tip, which has a radius curvature in range 10−15 nm. Steady-state cyclic voltammetry measurements for reduction Ru(NH3)6Cl3 feedback experiments showed distinct reproducible response electrode. These experimental results agreed with finite element simulations corresponding diffusion process. Sequentially topographical studies Pt lines deposited onto Si3N4...
Ar+ ion milling reduces the roughness of surface a glassy Rh25Zr75 sample to rms value <1 Å as proven by studies with scanning tunneling microscope (STM). Therefore, such metallic glasses provide ideal substrates for nanometer-scale structure fabrication. Here we present new method modify, in reproducible way, STM. The resulting structures are shown STM well. high local current density can raise temperature very small volume near glass. An increase and electric field lead either...
Four different conductive supports are analysed regarding their suitability for combined atomic force and scanning electrochemical microscopy (AFM-SECM) on biological membranes. Highly oriented pyrolytic graphite (HOPG), MoS(2), template stripped gold, platinum compared as high resolution imaging of reconstituted membrane proteins or native membranes, electrodes transferring electrons from to a redox molecule. We demonstrate that topographs the bacterial outer protein F can be recorded by...