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Folded Mos2 layers with reduced interlayer coupling

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Nano Research 2014年第4期7卷 572-578页

作者： Andres Castellanos-Gomez herre s. j. van der zant Gary A. steele Kavli Institute of Nanoscience Delft University of Technology 2528 CJ Delft The Netherlands

We study molybdenum disulfide （Mos2） structures generated by folding single-layer and bilayer Mos2 flakes. We find that this modified layer stacking leads to a decrease in the interlayer coupling and an enhancement of the photoluminescence emission yield. We additionally find that folded single-layer Mos2 structures show a contribution to photoluminescence spectra of both neutral and charged excitons, which is a characteristic feature of single-layer Mos2 that has not been observed in multilayer Mos2. The results presented here open the door to fabrication of multilayered Mos2 samples with high optical absorption while maintaining the advantageous enhanced photoluminescence emission of single-layer Mos2 by controllably twisting the Mos2 layers.

关键词： molybdenum disulfide(Mos2) folded Mos2 twisted Mos2 interlayer coupling Raman spectroscopy photoluminescence

The effect of the substrate on the Raman and photoluminescence emission of single-layer Mos2

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Nano Research 2014年第4期7卷 561-571页

作者： Michele Buscema Gary A. steele herre s. j. van der zant &ndres Castellanos-Gomez Kavli Institute of Nanoscience Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands

We quantitatively study the Raman and photoluminescence （PL） emission from single-layer molybdenum disulfide （Mos2） on dielectric （siO2, hexagonal boron nitride, mica and the polymeric dielectric Gel-Film） and conducting substrates （Au and few-layer graphene）. We find that the substrate can affect the Raman and PL emission in a twofold manner. First, the absorption and emission intensities are strongly modulated by the constructive/destructive interference within the different substrates. second, the position of the Alg Raman mode peak and the spectral weight between neutral and charged excitons in the PL spectra are modified by the substrate. We attribute this effect to substrate-induced changes in the doping level and in the decay rates of the excitonic transitions. Our results provide a method to quantitatively study the Raman and PL emission from Mosa-based vertical heterostructures and represent the first step in ad hoc tuning the PL emission of 1L Mos2 by selecting the proper substrate.

关键词： molybdenum disulfide van der Waalsheterostructures Raman microscopy photoluminescenceenhancement photoluminescencequenching substrate effect

Fast and reliable identification of atomically thin layers of Tase2 crystals

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Nano Research 2013年第3期6卷 191-199页

作者： Andres Castellanos-Gomez Efren Navarro-Moratalla Guillermo Mokry jorge Quereda Elena Pinilla-Cienfuegos Nicolas Agrait herre s. j. van der zant Eugenio Coronado Gary A. steele Gabino Rubio-Bollinger Kavli Institute of Nanoscience Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands Instituto Ciencia Molecular (ICMol) Univ. Valencia C/Catedrdtico Jose Beltrdn 2 E-46980 Paterna Spain Departamento de Fisica de la Materia Condensada (C-III). UniversidadAutonoma de Madrid Campus de Cantoblanco 28049 Madrid Spain Instituto Madrileno de Estudios Avanzados en Nanociencia IMDEA-Nanociencia E-28049 Madrid Spain

Deposition of clean and defect-free atomically thin two-dimensional crystalline flakes on surfaces by mechanical exfoliation of layered bulk materials has proven to be a powerful technique, but it requires a fast, reliable and non-destructive way to identify the atomically thin flakes among a crowd of thick flakes. In this work, we provide general guidelines to identify ultrathin flakes of Tase2 by means of optical microscopy and Raman spectroscopy. Additionally, we determine the optimal substrates to facilitate the optical identification of atomically thin Tase2 crystals. Experimental realization and isolation of ultrathin layers of Tase2 enables future studies on the role of the dimensionality in interesting phenomena such as superconductivity and charge density waves.

关键词： atomically thin layer metal dichalcogenide layered superconductor Tase2 optical microscopy Raman spectroscopy

High-quality-factor tantalum oxide nanomechanical resonators by laser oxidation of Tase2

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Nano Research 2015年第9期8卷 2842-2849页

作者： santiago j. CartamiI-Bueno Peter G. steeneken Frans D. Tichelaar Efren Navarro-Moratalla Warner j. Venstra Ronald van Leeuwen Eugenio Coronado herre s.j. van der zant Gary A. steele Andres Castellanos-Gomez Kavli Institute of Nanoscience Delft University of Technology Lorentzweg 1 2628 CJ Delft The Netherlands Kavli Institute of Nanoscience Delft University of Technology National Centre for HREM Lorentzweg 1 2628 CJ Delft The Netherlands Instituto Ciencia Molecular (ICMol) Univ. Valencia C/Catedrdtico Jos@ Beltrdn 2 E-46980 Paterna Spain

Controlling the strain in two-dimensional （2D） materials is an interesting avenue to tailor the mechanical properties of nanoelectromechanical systems. Here, we demonstrate a technique to fabricate ultrathin tantalum oxide nanomechanical resonators with large stress by the laser oxidation of nano-drumhead resonators composed of tantalum diselenide （Tase2）, a layered 2D material belonging to the metal dichalcogenides. Before the study of their mechanical properties with a laser interferometer, we verified the oxidation and crystallinity of the freely suspended tantalum oxide using high-resolution electron microscopy. We demonstrate that the stress of tantalum oxide resonators increases by 140 MPa （with respect to pristine Tase2 resonators）, which causes an enhancement in the quality factor （14 times larger） and resonance frequency （9 times larger） of these resonators.

关键词： Tase2,tantalum oxide,mechanical resonators,laser oxidation,optical interferometer,high quality factor

Characterization of Nanometer-spaced Few-Layer Graphene Electrodes

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Graphene 2012年第2期1卷 26-29页

作者： Enrique Burzurí Ferry Prins herre s. j. van der zant Kavli Institute of Nanoscience Delft University of Technology Delft The Netherlands

We study graphene electrodes that can be used for contacting single molecules. The nanometer-scale gap is made by feedback controlled electroburning in few-layer graphene sheets. We analyze the time stability, and the influence of the temperature and gate voltage on the current flowing through the empty gaps. The electrodes are stable at room temper- ature for long periods of time. We show statistics of the relation between the initial resistance of the few-layer graphe- ne flakes and the final size of the gaps. We find that thicker flakes are more suitable for the fabrication of the elec-trodes.

关键词： Graphene spintronics Three-Terminal Transistors

Nanoelectromechanical sensors Based on suspended 2D Materials

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Research 2020年第1期2020卷 1612-1636页

作者： Max C.Lemme stefan Wagner Kangho Lee Xuge Fan Gerard j.Verbiest sebastian Wittmann sebastian Lukas Robin j.Dolleman Frank Niklaus herre s.jvan der zant Georg s.Duesberg Peter G.steeneken Chair of Electronic Devices RWTH Aachen UniversityOtto-Blumenthal-Str.252074 AachenGermany AMO GmbH Advanced Microelectronic Center Aachen(AMICA)Otto-Blumenthal-Str.2552074 AachenGermany Institute of Physics Faculty of Electrical Engineering and Information TechnologyUniversität der Bundeswehr MünchenWerner-Heisenberg-Weg 3985577 NeubibergGermany Division of Micro and Nanosystems KTH Royal Institute of TechnologyMalvinas Vag 1010044 StockholmSweden Department of Precision and Microsystems Engineering Delft University of TechnologyMekelweg 22628 CD DelftNetherlands Infineon Technologies AG Wernerwerkstraße 293049 RegensburgGermany nd Institute of Physics RWTH Aachen UniversityOtto-Blumenthal-Str.52074 AachenGermany Kavli Institute of Nanoscience Delft University of TechnologyLorentzweg 12628 CJ DelftNetherlands

The unique properties and atomic thickness of two-dimensional(2D)materials enable smaller and better nanoelectromechanical sensors with novel *** the last decade,many studies have successfully shown the feasibility of using suspended membranes of 2D materials in pressure sensors,microphones,accelerometers,and mass and gas *** this review,we explain the different sensing concepts and give an overview of the relevant material properties,fabrication routes,and device operation ***,we discuss sensor readout and integration methods and provide comparisons against the state of the art to show both the challenges and promises of 2D material-based nanoelectromechanical sensing.

关键词： sensors enable accelerometer

Flexible Graphene Devices with an Embedded Back-Gate

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Graphene 2013年第1期2卷 13-17页

作者： jasper van Veen Andres Castellanos- Gomez herre s. j. van der zant Gary A. steele Kavli Institute of Nanoscience Delft University of Technology Delft The Netherlands

We show the fabrication of flexible graphene devices with an embedded backgate. The resistance of these devices can be tuned by changing the strain through the bending of the substrate. These devices can be useful for applications requiring a flexible graphene-based field effect transistor in where the graphene channel is not covered (such as biological or chemical sensors and photo-detectors).

关键词： Graphene Device Flexible Electronics Back-Gate strain Engineering

Women in visual neural regeneration research

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Neural Regeneration Research 2025年第2期20卷 489-490页

作者： Tonia s.Rex David j.Calkins vanderbilt Eye Institute Vanderbilt University Medical CenterNashvilleTNUSA

The year 2024 marks the 60^(th)anniversary of Title IX and 25 years since the New York Times revealed bias against female faculty members at the Massachusetts Institute of *** take an opportunity here to examine the state of gender bias in a relatively new yet already prominent field,neural regeneration in the visual system,for which there is a well-defined context useful for this *** National Eye Institute(NEI)provided the first round of research funding for its Audacious Goals Initiative(AGI)on visual neural regeneration in 2013 and the last round in ***,we focus on this *** sources included PubMed,the National science Foundation(NsF),the NEI,the Blue Ridge Institute for Medical Research and data from the major professional organization for eye and vision research,the Association for Research in Vision and Ophthalmology(ARVO).

关键词： neural visual Times

Cost projections for microwave plasma CO production using renewable energy

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journal of Energy Chemistry 2022年第8期31卷 507-513,I0014页

作者： Remko j.Detz Bob van der Zwaan Netherlands Organisation for Applied scientific Research(TNO) Amsterdam 1043 NTThe Netherlands Faculty of science(HIMs and IAs) University of AmsterdamAmsterdam 1090 GDThe Netherlands school of Advanced International studies(sAIs) Johns Hopkins UniversityBologna 40126Italy

successful deployment of renewable fuel production requires substantial cost reduction along the entire value chain of the underlying manufacturing *** improve their performance,renewable fuel production technologies should follow a cost-reducing learning *** this article,we adopt recent evidence that learning-by-doing is directly influenced by the technology unit size and explore three scenarios for microwave plasma CO_(2)conversion in which the learning rate varies between 10%,15%,and 20%.Our projections reveal that the total investments required to deploy this CO_(2)conversion technology at an exajoule scale decline from 83 down to 23 billion euros under a 10%increase in the value of the learning *** CO_(2) production costs in 2050 amount to 247–346€(2019)/t CO_(2),in which the range is determined by the value of the learning *** under substantial learning until 2050 the levelized CO production cost is unlikely to become competitive with conventional natural gas-based CO_(2) production processes,except when a CO_(2)tax is applied of up to 150€(2019)/t CO_(2).To optimally exploit effects of learning-by-doing,we recommend developing several CO production technologies simultaneously with multiple unit sizes,so as to improve the chance of ultimately selecting the process with the highest learning rate.

关键词： CO_(2)utilization synthetic fuels Renewable chemicals Learning curves Unit size