A5066678210- Terahertz technology and applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Molecular Junctions and Nanostructures
- Electrochemical Analysis and Applications
- Graphene research and applications
- Gyrotron and Vacuum Electronics Research
- 2D Materials and Applications
- Quantum Dots Synthesis And Properties
- Photonic and Optical Devices
- Carbon Nanotubes in Composites
- Semiconductor Quantum Structures and Devices
- Superconducting and THz Device Technology
- MXene and MAX Phase Materials
- Chronic Obstructive Pulmonary Disease (COPD) Research
- Quantum and electron transport phenomena
- ATP Synthase and ATPases Research
- Advanced Chemical Physics Studies
- Spectroscopy and Quantum Chemical Studies
- Cardiovascular and exercise physiology
- Protein Interaction Studies and Fluorescence Analysis
- Supramolecular Self-Assembly in Materials
- Hemoglobin structure and function
- Photoacoustic and Ultrasonic Imaging
- Mechanical and Optical Resonators
IMDEA Nanoscience
2021-2024
Madrid Institute for Advanced Studies
2022-2024
Fritz Haber Institute of the Max Planck Society
2020-2024
Hospital Universitario de Gran Canaria Doctor Negrín
2010-2023
Freie Universität Berlin
2020-2022
Max Planck Institute for Polymer Research
2016-2020
University of Applied Sciences Mainz
2017
Centre International deHautes Etudes Agronomiques Méditerranéennes
2015
Abstract Electrochemical surface activity arises from the interaction and geometric arrangement of molecules at electrified interfaces. We present a novel electrochemical tip‐enhanced Raman spectroscope that can access vibrational fingerprint less than 100 small, non‐resonant adsorbed atomically flat Au electrodes to study their adsorption geometry chemical reactivity as function applied potential. Combining experimental simulation data for adenine/Au(111), we conclude protonated physisorbed...
In situ characterization of surfaces with tip-enhanced Raman spectroscopy (TERS) provides chemical and topographic information high spatial resolution submonolayer sensitivity. To further the versatility TERS approach toward more complex systems such as biological membranes or energy conversion devices, adaptation technique to solid/liquid working conditions is essential. Here, we present a home-built side-illumination setup design based on commercial scanning tunneling microscope (STM)...
2D materials display exciting properties in numerous fields, but the development of applications is hindered by low yields, high processing times, and impaired quality current exfoliation methods. In this work we have used excellent MW absorption MoS2 to induce a fast heating that produces near-instantaneous evaporation an adsorbed, boiling point solvent. The sudden creates internal pressure separates layers with efficiency, these are kept separated action dispersion Our method (90 s) gives...
We present a computational tool to automatically analyze the Raman spectra of nanomaterials. The software manages hundreds simultaneously providing statistical information main spectral features and publication-ready figures.
Metallic spintronic terahertz (THz) emitters have become well-established for offering ultra-broadband, gapless THz emission in a variety of excitation regimes, combination with reliable fabrication and excellent scalability. However, so far, their potential high-average-power to reach strong fields at high repetition rates has not been thoroughly investigated. In this article, we explore the power scaling behavior tri-layer using an Yb-fiber source, delivering average 18.5 W (7 incident on...
Abstract Mechanically interlocked derivatives of carbon nanotubes (MINTs) are interesting nanotube products since they show high stability without altering the structure. So far, MINTs have been synthesized using ring‐closing metathesis, disulfide exchange reaction, H‐bonding or direct threading with macrocycles. Here, we describe encapsulation single‐walled within a palladium‐based metallosquare. The formation was confirmed by variety techniques, including high‐resolution transmission...
Rohit Chikkaraddy opened the discussion of Introductory Lecture: Regarding quantifying chemical enhancement, you showed a systematic change in SERS enhancement for halide substituted molecules due to charge transfer from metal. Is extra an inherent increas
Coupling phase-stable single-cycle terahertz (THz) pulses to scanning tunneling microscope (STM) junctions enables spatiotemporal imaging with femtosecond temporal and Ångstrom spatial resolution. The time resolution achieved in such THz-gated STM is ultimately limited by the subcycle variation of tip-enhanced THz field acting as an ultrafast voltage pulse, hence ability feed high-frequency, broadband into junction. Here, we report on coupling ultrabroadband (1-30 THz) from a spintronic...
Efficient operation of electronic nanodevices at ultrafast speeds requires understanding and control the currents generated by femtosecond bursts light. Ultrafast laser-induced in metallic nanojunctions can originate from photoassisted hot electron tunneling or lightwave-induced tunneling. Both processes drive localized photocurrents inside a scanning microscope (STM) on femto- to attosecond time scales, enabling STM with atomic spatial resolution. Femtosecond laser excitation nanojunction,...
In this work, we evaluate the dependence of tip-enhanced Raman (TER) spectra a monolayer thiophenol at Au(111) electrode on scanning tunneling microscope’s current set-point and bias voltage parameters. We find an increase TER intensity upon or decrease as expected from gap-distance reduction. The relations obtained follow theoretical model considering simple change when tuning mentioned that value affects to larger extent than set-point. Therefore it is advisable work in low-bias regime...
George Schatz opened a general discussion of the paper by Zhong-Qun Tian: The dependence Raman intensities with angle incidence and scattering is an important issue. This was described for flat surfaces long ago (before SERS) Greenler Schlager.1 How do your results dif
Lead chalcogenide quantum dots (QDs) are promising candidates for the use as sunlight absorbers in sensitized solar cells. While conversion efficiencies of QD cells have reached potentially commercially interesting values order 10%, devices prone to fast oxidative degradation whose mechanism is not understood detail yet. Furthermore, O2 and/or H2O present during fabrication has been observed strongly influence device performance. Analytical tools monitor chemical state QDs situ and on-line,...
Abstract Electrochemical surface activity arises from the interaction and geometric arrangement of molecules at electrified interfaces. We present a novel electrochemical tip‐enhanced Raman spectroscope that can access vibrational fingerprint less than 100 small, non‐resonant adsorbed atomically flat Au electrodes to study their adsorption geometry chemical reactivity as function applied potential. Combining experimental simulation data for adenine/Au(111), we conclude protonated physisorbed...
Spintronic terahertz emitters (STEs) are powerful sources of ultra-broadband single-cycle (THz) field transients. They work with any pump wavelength, and their polarity polarization direction easily adjustable. However, at high powers repetition rates, STE operation is hampered by a significant increase in the local temperature. Here, we resolve this issue rotating few 100 Hz, thereby distributing absorbed power over larger area. Our approach permits stable fluence ∼1 mJ/cm2 up to 18 W...
Ashish Tripathi opened a discussion of the paper by Volker Deckert: TERS imaging triangular shaped nanoparticle with D3ATP monolayer is shown in Fig. 3 your paper.1 The chemical map 1438 cm−1 band suggests that signal intensities are higher at e
We show that microemulsions can be used as a simple, cheap and scalable template for the covalent patterning of graphene.
We discuss the successful and reliable operation of spintronic Terahertz (THz) emitters at high pump powers up to $\sim 18$ Watt MHz repetition rates for THz-field-driven scanning tunneling microscopy (THz-STM). A rotating design emitter (STE) allows us operate STE fluences close 1$ mJ/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> using 10's ${\mu} \mathrm{J}$ pulse energies rates. This enables average power densities 1 kW/\mathrm...
Tip-enhanced Raman spectroscopy (TERS) provides the sensitivity required to obtain vibrational fingerprint of few molecules. While single molecule detection has been demonstrated in UHV experiments, technique ambient, liquid and electrochemical conditions is still limited. In this work, we present a new strategy increase signal-to-noise TERS by spatial light modulation. We iteratively optimize phase excitation beam employing two different feedback mechanisms. one optimization protocol,...
Abstract The front cover artwork is provided by the Domke group from Max Planck Institute for Polymer Research. image shows a cartoon association with Raman under water, depicting an underwater scene where molecule‐plants attached to nearfield‐generating particles are illuminated spotlight of submarine and studied through periscope. Read full text Minireview at 10.1002/celc.201700293 .
Abstract Patterning of graphene (functionalizing some areas while leaving others intact) is challenging, as all the C atoms in basal plane are identical, but it also desirable for a variety applications, like opening bandgap electronic structure graphene. Several methods have been reported to pattern graphene, most them very technologically intensive. Recently, we use microemulsions templates at μm scale. This method simple and principle tunable, emulsions different droplet size composition...
Spintronic terahertz emitters (STEs) are powerful sources of ultra-broadband single-cycle (THz) field transients. They work with any pump wavelength, and their polarity polarization direction easily adjustable. However, at high powers repetition rates, STE operation is hampered by a significant increase in the local temperature. Here, we resolve this issue rotating few 100 Hz, thereby distributing absorbed power over larger area. Our approach permits stable fluence ~1 mJ/cm$^2$ up to 18 W...