Layered materials consist of molecular layers stacked together by weak interlayer interactions. They often crystallize to form atomically smooth thin films, nanotubes, and platelet or fullerene-like nanoparticles due the anisotropic bonding. Structures that predominately expose edges exhibit high surface energy are considered unstable. In this communication, we present a synthesis process grow MoS2 MoSe2 films with vertically aligned layers, thereby maximally exposing on film surface. Such...

A highly-sensitive ammonia (NH3) gas sensor based on molybdenum trioxide nanoribbons was developed in this study. α-MoO3 (MoO3 NRs) were successfully synthesized via a hydrothermal method and systematically characterized using various advanced technologies. Following simple drop-cast process, high-performance chemiresistive NH3 fabricated through the deposition of MoO3 NR sensing film onto Au interdigitated electrodes. At an optimal operation temperature 450 °C, nanoribbon-based exhibited...

Whereas single crystals of organic compounds that respond to heat or light have been reported and studied in detail, studies on crystalline elicit an extreme mechanical response upon cooling very low temperatures are relatively rare the chemical literature. A tetrafluoro(aryl)sulfanylated bicyclopentane synthesized our laboratory was discovered exhibit such behavior; i.e., jumped forcefully disintegrated below ∼193 K. Accordingly, origin this low-temperature thermosalient effect investigated...

In this paper, we report the development of rod-shaped semiconductor nanocrystals (quantum rods) as fluorescent biological labels. Water-soluble biocompatible quantum rods have been prepared by surface silanization and applied for nonspecific cell tracking well specific cellular targeting. Quantum are brighter single molecule probes compared to dots. They many potential applications labels in situations where their properties offer advantages over

We have developed a chemical method to intercalate variety of zerovalent metal atoms into two-dimensional (2D) layered Bi2Se3 chalcogenide nanoribbons. use reaction, such as disproportionation redox generate dilute in refluxing solution, which the structure. The nature intercalant allows superstoichiometric intercalation Ag, Au, Co, Cu, Fe, In, Ni, and Sn. foresee impact this methodology establishing novel fundamental physical behaviors possible energy applications.

A major goal of intercalation chemistry is to intercalate high densities guest species without disrupting the host lattice. Many intercalant concentrations, however, are limited by charge species. Here we have developed a general solution-based chemical method for intercalating extraordinarily zero-valent copper metal into layered Bi(2)Se(3) nanoribbons. Up 60 atom % (Cu(7.5)Bi(2)Se(3)) can be intercalated with no disruption lattice using solution disproportionation redox reaction.

Molybdenum trioxide (α-MoO3) is a 2D layered oxide with use in electrochromic and photochromic devices owing to its ability reversibly change color between transparent light blue electrochemical or hydrogen intercalation. Despite significant application potential, MoO3 performance largely limited by the destructiveness of these intercalation techniques, insignificant coloration, slow response. We demonstrate reversible chemochromic method, using zerovalent metals into α-MoO3 nanoribbons (Sn,...

Inorganic nanocrystals have attracted widespread attention both for their size-dependent properties and potential use as building blocks in an array of applications. A complete understanding chemical transformations is important controlling structure, composition, electronic properties. Here, we utilize situ high-resolution transmission electron microscopy to study structural morphological individual sulfide (copper sulfide, iron cobalt sulfide) they react with lithium. The experiments...

The photoluminescence of CdSe/CdS core/shell quantum dots, nanorods, and tetrapods is investigated as a function applied hydrostatic non-hydrostatic pressure. optoelectronic properties all three nanocrystal morphologies are affected by strain. Furthermore, it demonstrated that the unique morphology seeded highly sensitive to non-isotropic stress environments. Seeded can thereby serve an optical strain gauge, capable measuring forces on order nanonewtons. We anticipate gauge with readout will...

Abstract magnified image Topological insulators provide a gateway to investigate fundamental quantum behaviours of exotic quasi‐particles as well the promise revolutionize modern technology. This is due their unique surface states that are robust against time reversal perturbation and exhibit spin‐momentum locking property. Enhancing state signal in proportion bulk material critical study for future electronics applications. can be achieved by making topological into nanostructures, which...

We demonstrate the complete tunability of a general strategy to intercalate zero-valent atoms into two-dimensional (2D) layered materials. A chemical method was used high densities copper (up 55 atomic percent) synthesized nanomaterials such as MoO3, Sb2Te3, In2Se3, and GaSe. These materials were characterized using TEM, EDX, electron diffraction, XRD, Raman, EELS, XPS observe effects intercalation, determine concentration copper, confirm nature intercalant well unchanged structure host...

We demonstrate the intercalation of multiple zero-valent atomic species into two-dimensional (2D) layered Bi2Se3 nanoribbons. Intercalation is performed chemically through a stepwise combination disproportionation redox reactions, hydrazine reduction, or carbonyl decomposition. Traditional electrochemical thus limiting intercalant guests to single species. show that atoms can be intercalated this chemical route host lattice 2D crystal. Intermetallic exhibit unique structural ordering...

Abstract The intercalation of layered compounds opens up a vast space new host–guest hybrids, providing routes for tuning the properties materials. Here, it is shown that uniform and continuous layers copper can be intercalated within van der Waals gap bulk MoS 2 resulting in unique Cu–MoS hybrid. hybrid, which remains semiconducting, possesses plasmon resonance at an energy ≈1eV, giving rise to enhanced optoelectronic activity. Compared with high‐performance photodetectors, copper‐enhanced...

Zero-valent intercalation of atomic metals into the van der Waals gap layered materials can be used to tune their electronic, optical, thermal, and mechanical properties. Here, we report impact intercalating ∼3 atm percent zero-valent copper germanium sulfide (GeS). Advanced many-body calculations predict that introduces quasi-localized intermediate band states, time-resolved THz spectroscopy studies demonstrate those states have prominent effects on photoconductivity GeS. Cu-intercalated...

Using an angle-dispersive Fabry-Perot interferometer in a confocal backscattering geometry, we have obtained Brillouin images of several liquid and polymer materials. One- two-dimensional heterogeneous samples are presented using longitudinal frequency shifts acoustic attenuation for contrast. The experimental resolution the is 20μm.

New plasmonic materials with tunable properties are in great need for nanophotonics and metamaterials applications. Here we present two-dimensional layered, metal chalcogenides as that feature both dielectric photonic modes across a wide spectral range from the infrared to ultraviolet. The anisotropic layered structure allows intercalation of organic molecules atoms at van der Waals gap host chalcogenide, presenting chemical route create heterostructures molecular atomic precision This marks...

We report low-temperature, magnetotransport measurements of ferrocene-doped Bi(2)Se(3) nanoribbons grown by vapor-liquid-solid method. The Kondo effect, a saturating resistance upturn at low temperatures, is observed in these ribbons to indicate presence localized impurity spins. Magnetoconductances the display both weak localization and antilocalization, which contrast with those undoped that show only antilocalization. magnetoconductances are governed one-dimensional theory includes spin...

A topological insulator is a new phase of quantum matter with bulk band gap and spin-polarized surface states, which might find use in applications ranging from electronics to energy conversion. Despite much exciting progress the field, high-yield solution synthesis has not been widely used for study behavior. Here, we demonstrate that solvothermally synthesized Bi2Se3 nanoplates are attractive studies. The carrier concentration these controlled by compensational Sb doping during synthesis....

Ferroelectric semiconductors have been predicted to exhibit strong zero-bias shift current, spurring the search for ferroelectric with band gaps in visible range as candidates so-called current photovoltaics efficiencies not constrained by Schockley–Queisser limit. Recent theoretical works that two-dimensional IV–VI monochalcogenides are multiferroic and capable of generating significant currents. Here we present experimental validation this prediction, observing ultrafast currents detecting...

We report the synthesis of high-quality single-crystal two-dimensional, layered nanostructures silicon telluride, Si2Te3, in multiple morphologies controlled by substrate temperature and Te seeding. Morphologies include nanoribbons formed VLS growth from droplets, vertical hexagonal nanoplates through vapor–solid crystallographically oriented on amorphous oxide substrates, flat large-area liquid pools. show potential for doping choice conditions. Vertical grown sapphire example, can...