Monolayer tungsten disulfides (WS2) constitute a high quantum yield two-dimensional (2D) system, and can be synthesized on large area using chemical vapor deposition (CVD), suggesting promising nanophotonics applications. However, spatially nonuniform photoluminescence (PL) intensities peak wavelengths observed in single WS2 grains have puzzled researchers, with the origins of variation relative contributions excitons, trions, biexcitons to PL emission not well understood. Here, we present...

Thermodynamics drive crystalline organic molecules to be crystallized at temperatures below their melting point. Even though can form supercooled liquids by rapid cooling, materials readily undergo a phase transformation an energetically favorable upon subsequent heat treatment. Opposite this general observation, here, we report molecular design of thermally stable liquid diketopyrrolopyrrole (DPP) derivatives and intriguing shear-triggered crystallization with dramatic optical property...

One of the unique features atomically thin two-dimensional materials is strong Coulomb interactions due to reduced dielectric screening effect; this feature enables study many-body phenomena such as excitons, trions, and biexcitons. However, identification biexcitons remains unresolved owing their broad peak at room temperature. Here, we investigate multiexcitons in monolayer $\mathrm{Mo}{\mathrm{S}}_{2}$ using both electrical optical doping identify transition energies for each exciton. The...

Despite the direct band gap of monolayer transition metal dichalcogenides (TMDs), their optical gain remains limited because poor light absorption in atomically thin, layered materials. Most approaches to improve TMDs mainly involve modulation active materials or multilayer stacking. Here, we report a method enhance and emission MoS2 simply through design nanostructured substrate. The substrate consisted dielectric nanofilm spacer (TiO2) film. overall photoluminescence intensity from on was...

Two-dimensional transition metal dichalcogenides (2D TMDs) have gained great interest due to their unique tunable bandgap as a function of the number layers. Especially, single-layer tungsten disulfides (WS2) is direct band gap semiconductor with 2.1 eV featuring strong photoluminescence and large exciton binding energy. Although synthesis MoS2 layer dependent properties been studied rigorously, little attention has paid formation WS2 its properties. Here we report scalable uniform film by...

Heterostacking of layered transition-metal dichalcogenide (LTMD) monolayers (1Ls) offers a convenient way designing two-dimensional exciton systems. Here we demonstrate the simultaneous hosting positive trions and negative in heterobilayers made by vertically stacking 1L MoSe2 MoS2. The charge transfer occurring between 1Ls MoS2 converted polarity from to positive, resulting presence same heterostacked bilayer. Significantly enhanced photoluminescence (PL) bilayers compared PL alone suggests...

Alloying two-dimensional transition metal dichalcogenides (2D TMDs) is a promising avenue for band gap engineering. In addition, developing scalable synthesis process essential the practical application of these alloys with tunable gaps in optoelectronic devices. Here, we report optically uniform and single-layer Mo1–xWxS2 by two-step chemical vapor deposition (CVD) method followed laser thinning process. The amount W content (x) alloy systemically controlled co-sputtering technique....

Optoelectronics applications for transition-metal dichalcogenides are still limited by weak light absorption and their complex exciton modes easily perturbed varying excitation conditions, because they inherent in atomically thin layers. Here, we propose a method of selectively amplifying the primary (A0) among complexes monolayer MoS2 via cyclic re-excitation cavity-free exciton-coupled plasmon propagation. This was implemented partially overlapping Ag nanowire (NW) on separated SiO2...

Monolayer transition-metal dichalcogenides (1L-TMDs) are atomically thin direct band gap semiconductors, from which the emission of light is determined by optical transitions exciton complexes such as neutral excitons and trions. While quantum yields 1L-TMDs quite low, ability to control populations in through various doping processes an interesting advantage, provides ample possibilities for engineering properties these semiconductor monolayers. Here we demonstrate a simple method...

Exciton transitions are mostly responsible for the optical properties of transition metal dichalcogenide monolayers (1L-TMDs). Extensive studies and structural characterization indicated that presence local defects charge population critically influence exciton emissions 1L-TMDs. However, due to large variations sample experimental conditions, exact mechanism emission influenced by is not clearly understood. In this work using near-field scanning imaging spectroscopy, we directly visualized...

Plasmon coupling and propagation between metallic nanowires (NWs) atomically thin transition-metal dichalcogenide semiconductors are demonstrated using Ag NW/MoS2 hybrids. The high exciton–plasmon efficiency with large throughput of MoS2 excitons allows quantitative assessment plasmon waveguide performance. Monolayer real-space visualization the propagating plasmons along NW via direct plasmon–exciton coupling. As a service to our authors readers, this journal provides supporting information...

Polycrystalline growth of molybdenum disulfide (MoS2) using chemical vapor deposition (CVD) methods is subject to the formation grain boundaries (GBs), which have a large effect on electrical and optical properties MoS2-based optoelectronic devices. The identification grains GBs CVD-grown monolayer MoS2 has traditionally required atomic resolution microscopy or nonlinear imaging techniques. Here, we present simple spectroscopic method for visualizing polycrystalline stacked bilayers mapping...

An n-type MoS2 monolayer grown by chemical vapor deposition method was partially hybridized with an organic semiconducting p-type tetracene thin film. The photoluminescence (PL) intensity in the hybrid region of MoS2/tetracene is clearly lower than that pristine because charge-transfer effect, which confirmed decrease exciton lifetimes. Decrease temperature led to blue-shift PL peak position layers and, consequently, intensities both and considerably increased owing phonon interaction....

In this study, single-walled carbon nanotube (SWCNT)/Cu nanocomposites were systematically synthesized from oxidized SWCNTs and Cu formate via photothermal heating.

We report the controllable nanosized local thinning of multi-layer (2 L and 3 L)-thickness MoS2 films down to monolayer (1 L) thickness using simple method annealing in a dry oxygen atmosphere. The temperature was optimized range 240 °C 270 for 1.5 h, 1 thick pits were developed on uniform film 2 grown chemical vapor deposition method. characterized formation nanoscale confocal photoluminescence (PL) Raman spectroscopy. observed that PL intensity increased frequency shifted, representative...

Stacked bilayer molybdenum disulfide (MoS2) exhibits interesting physical properties depending on the stacking orientation and interlayer coupling strength. Although optical properties, such as photoluminescence, Raman, absorption are largely dependent of stacked MoS2, origin variations in these is not clearly understood. We performed comprehensive confocal Raman mapping measurements to determine dependence spectra MoS2. The results indicated that with 532-nm laser excitation, scattering...

To translate, adapt, and test the reliability, validity, responsiveness of Korean version Shoulder Disability Questionnaire (SDQ) Rating (SRQ).The international guideline for adaptation questionnaires was referenced translation original SDQ SRQ. Correlations SDQ-K SRQ-K with Pain Index (SPADI) Numeric Scale (NRS) were assessed to determine reliability validity questionnaires. evaluate surveys performed at baseline a mean 6 days later in 29 subjects who did not undergo any treatment shoulder...

We demonstrate a simple method of stretching DNA to its full length, suitable for optical imaging and atomic force microscopy (AFM). Two competing forces on the molecules, which are electrostatic attraction between positively charged dye molecules (YOYO-1) intercalated into negatively surface glass substrate, centrifugal rotating mainly responsible effective dispersion single strands DNA. The density stretched could be controlled by concentration dye-stained solution. Stretching was...

A 50-year-old female was admitted to Pusan National University Hospital with complaints of fatigue and sweating. Echocardiography showed a small patent ductus arteriosus (PDA) highly mobile vegetations on the aortic valve. Emergency operation performed due high risk embolization severe regurgitation. When pulmonary artery opened, we found unexpected fresh vegetation. The tissue PDA fragile infected. We successfully removed infected tissue, closed patch, replaced valve mechanical prosthesis.

We demonstrate the fine control of nanoscale photoluminescence (PL) and optical waveguiding characteristics light-emitting organic rubrene nanorods (NRs) through focused electron-beam (E-beam) irradiation. Nanoscale laser confocal microscope PL intensity spectra E-beam-treated compartments NR drastically varied with E-beam dose, yellow-white light emission from those a specific dose was observed. In experiments, propagation signals along single were dependent on crystalline structure...