We detect electroluminescence in single layer molybdenum disulphide (MoS2) field-effect transistors built on transparent glass substrates. By comparing absorption, photoluminescence, and of the same MoS2 layer, we find that they all involve excited state at 1.8eV. The has pronounced threshold behavior is localized contacts. results show MoS2, a direct band gap semiconductor, promising for novel optoelectronic devices, such as 2-dimensional light detectors emitters.

Black phosphorus is a layered semiconductor that intensely researched in view of applications optoelectronics. In this letter, we investigate multilayer black photodetector capable acquiring high-contrast (V > 0.9) images both the visible (λVIS = 532 nm) as well infrared (λIR 1550 spectral regime. first step, by using photocurrent microscopy, map active area device and characterize responsivity gain. second deploying point-like detector confocal microsope setup, acquire diffraction-limited...

Thin film transistors (TFTs) are now poised to revolutionize the display, sensor, and flexible electronics markets. However, there is a limited choice of channel materials compatible with low-temperature processing. This has inhibited fabrication high electrical performance TFTs. Single-walled carbon nanotubes (CNTs) have very mobilities can be solution-processed, making thin CNT-based TFTs natural direction for exploration. The two main challenges facing CNT-TFTs difficulty placing aligning...

Graphene has extraordinary electronic and optical properties holds great promise for applications in photonics optoelectronics. Demonstrations including high-speed photodetectors, modulators, plasmonic devices, ultrafast lasers have now been reported. More advanced device concepts would involve photonic elements such as cavities to control light–matter interaction graphene. Here we report the first monolithic integration of a graphene transistor planar, microcavity. We find that...

Experimental measurements of the photoresponse in doped multilayer black phosphorus phototransistors show that photocurrent generation is dominated by thermoelectric and bolometric processes, not photovoltaic effect.

We report the radio-frequency performance of carbon nanotube array transistors that have been realized through aligned assembly highly separated, semiconducting nanotubes on a fully scalable device platform. At gate length 100 nm, we observe output current saturation and obtain as-measured, extrinsic gain power cut-off frequencies, respectively, 7 GHz 15 GHz. While is comparable to state-of-the-art improved. The de-embedded, intrinsic frequencies 153 30 are highest values experimentally...

We combine optical microspectroscopy and electronic measurements to study how gold deposition affects the physical properties of graphene. find that structure, electron-phonon coupling, doping level in gold-plated graphene are largely preserved. The transfer lengths for electrons holes at graphene-gold contact have values as high 1.6 μm. However, interfacial coupling causes local temperature drops up 500 K operating devices.

We demonstrate a light emitting p-i-n diode made of highly aligned film separated (99%) semiconducting carbon nanotubes, self-assembled from solution. By using split gate technique, we create p- and n-doped regions in the nanotube that are by micron-wide gap. inject n-type charge carriers into device channel opposite contacts investigate radiative recombination optical micro-spectroscopy. find threshold-less generation efficiency intrinsic segment can be enhanced increasing potential drop...

We present the first photocurrent measurements along single carbon nanotube (CNT) devices with 30 nm resolution. Our technique is based on tip-enhanced near-field optical microscopy, exploiting plasmonically enhanced absorption controlled by an nanoantenna. This allows for imaging of zero-bias caused charge separation in local built-in electric fields at contacts and close to charged particles that cannot be resolved using confocal microscopy. Simultaneously recorded Raman scattering images...

Controlled placement of nanomaterials at predefined locations with nanoscale precision remains among the most challenging problems that inhibit their large-scale integration in field semiconductor process technology. Methods based on surface functionalization have a drawback where undesired chemical modifications can occur and deteriorate deposited material. The application electric-field assisted techniques eliminates element treatment; however, it requires an incorporation conductive...

We have used laser-excited photocurrent microscopy to map the internal electrostatic potential profile of semiconducting single-walled carbon nanotube (S-SWCNT) array devices with a spatial resolution 250 nm. The measurements S-SWCNTs on optically transparent samples provide new insights into physical principles device operation and reveal performance-limiting local heterogeneities in not observable other imaging techniques. experiments deliver images from underside S-SWCNT–metal contacts...

Wettability is the affinity of a liquid for solid surface. For energetic reasons, macroscopic drops are nearly spherical away from interfaces with solids, and any local deformations due to molecular-scale surface interactions negligible. Studies wetting phenomena, therefore, typically assume that on adopts shape cap. The degree wettability then captured by contact angle where liquid-vapor interface meets solid-liquid interface. As droplet volumes shrink scale attoliters, however, become...

We report operating temperatures and heating coefficients measured in a multilayer black phosphorus device as function of injected electrical power. By combining micro-Raman spectroscopy transport measurements, we have observed linear temperature increase up to 600 K at power dissipation rate 0.896 μm(3)/mW. further increasing the bias voltage, determined threshold for breakdown analyzed fracture layer that caused failure by means scanning electron microscopy atomic force microscopy. The...

Analysis of nanoscale liquids, including wetting and flow phenomena, is a scientific challenge with far reaching implications for industrial technologies. We report the conception, development, application an integrated platform experimental characterization liquids at nanometer scale. The combines functionalities two-dimensional electronic array sensor devices in situ highly sensitive optical microspectroscopy atomic force microscopy. demonstrate performance capabilities embodiment based on...

We report on the dynamics of spatial temperature distributions in aligned semiconducting carbon nanotube array devices with submicrometer channel lengths. By using high-resolution optical microscopy combination electrical transport measurements, we observe under steady state bias conditions emergence time-variable, local maxima dimensions below 300 nm, and temperatures above 400 K. On basis time domain cross-correlation analysis, investigate how intensity fluctuations thermal radiation...

Abstract The global average Recovery Factor (RF) in oil fields is only about 20-40%. A possible reason for such a low RF might be that Enhanced Oil (EOR) techniques are not yet broadly applied. This could economic reasons, concerns regarding the effectiveness of EOR and potential damage to reservoir, or lack reservoir-specific recommendations. In this contribution, we introduce methodology selects materials specific reservoir conditions by using Artificial Intelligence (AI) methods. We...

Paper-based microfluidic devices offer great potential as a low-cost platform to perform chemical and biochemical tests. Commercially available formats such dipsticks lateral-flow test are widely popular they easy handle produce fast unambiguous results. Although these simple lack precise control over the flow enable integration of complex functionality for multistep processes or ability multiplex several tests, intense research in this area is rapidly expanding possibilities. Modeling...

Abstract Advances in enhanced oil recovery (EOR) require quantification of surface wetting phenomena on the nanometer scale under well controlled conditions. We introduce a novel measurement platform that enables optical microscopy and atomic force within dedicated, optically transparent analysis device. The entails deposition characterization extremely small amounts liquids having volumes order 10 attoliters (10–17liter). analyzed are located at well-characterized test is customizable to...

The investigation and control of liquid flow at the nanometer scale is a key area applied research with high relevance to physics, chemistry, biology. We introduce method device that allows spatial resolution by integrating an array graphene-based magnetic (Hall) sensors used for tracking movement nanoparticles immersed in under investigation. With novel concept based on standard integration processes experimentally verified material parameters, we numerically simulate performance single...

There is up to date no agreement on what the enhancement factor (f <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">e</sub> ) in tip-enhanced Raman Spectroscopy (TERS). The complexity resides both lack of a proper theoretical definition and reliable experimental procedure for measuring it. Here we propose protocol reference material characterize intrinsic f value TERS nanoantenna. based description tip-sample approach curve, which should be...

Abstract We present a lab-on-chip platform for the experimental test and evaluation of Enhanced Oil Recovery [EOR] materials that enables direct access to nanoscale pore scale flow phenomena. The chip devices with nanometer features are made based on state-of-the-art semiconductor process technology. design is highly customizable allows implementation geometrical model representations (statistical naturally occuring porosity patterns) could be tested over wide range pressures temperatures....

Cruising for parking in city centers is a problem many motorists and communities that need to reduce emissions. A widespread provision of assistance address this requires scalable system generate availability information. Existing approaches estimate the spaces use supervised learning depend on ground-truth labeling processes involving sensors or manual data collection. This dependency constraints roll-out operation such systems as collection model training, monitoring retraining...

In this paper, we present a new approach for making active carbon nanotube (CNT) electrical devices and demonstrate the first aligned CNT array field effect transistors (FET) from 99% pure separated semiconducting nanotubes. Through evaporation-driven deposition of predominantly nanotubes liquid phase, have fabricated aligned, thin-film with high on-state currents. The fabrication scheme presented here provides versatile production method translatable to other substrates such as flexible plastics.