Solar illumination of broadly absorbing metal or carbon nanoparticles dispersed in a liquid produces vapor without the requirement heating fluid volume. When particles are water at ambient temperature, energy is directed primarily to vaporization into steam, with much smaller fraction resulting fluid. Sunlight-illuminated can also drive H(2)O-ethanol distillation, yielding fractions significantly richer ethanol content than simple thermal distillation. These phenomena enable important...

Organometal halide perovskites have recently emerged displaying a huge potential for not only photovoltaic, but also light emitting applications. Exploiting the optical properties of specifically tailored perovskite nanocrystals could greatly enhance efficiency and functionality applications based on this material. In study, we investigate quantum size effect in colloidal organometal nanoplatelets. By tuning ratio organic cations used, can control thickness consequently photoluminescence...

Abstract We describe the simple, scalable, single‐step, and polar‐solvent‐free synthesis of high‐quality colloidal CsPbX 3 (X=Cl, Br, I) perovskite nanocrystals (NCs) with tunable halide ion composition thickness by direct ultrasonication corresponding precursor solutions in presence organic capping molecules. High angle annular dark field scanning transmission electron microscopy (HAADF‐STEM) revealed cubic crystal structure surface termination NCs atomic resolution. The exhibit high...

Strong coupling between resonantly matched localized surface plasmons and molecular excitons results in the formation of new hybridized energy states called plexcitons. Understanding nature tunability these hybrid nanostructures is important for both fundamental studies development applications. We investigate interactions J-aggregate single plasmonic dimers report first time a unique strong regime individual plexcitonic nanostructures. Dark-field scattering measurements finite-difference...

The easily tunable emission of halide perovskite nanocrystals throughout the visible spectrum makes them an extremely promising material for light-emitting applications. Whereas high quantum yields and long-term colloidal stability have already been achieved emitting in red green spectral range, blue region currently lags behind, with low yields, broad profiles insufficient stability. In this work, we present a facile synthetic approach obtaining two-dimensional CsPbBr3 nanoplatelets...

Lead halide perovskite nanocrystals (NCs) are receiving a lot of attention nowadays, due to their exceptionally high photoluminescence quantum yields reaching almost 100% and tunability optical band gap over the entire visible spectral range by modifying composition or dimensionality/size. We review recent developments in direct synthesis ion exchange-based reactions, leading hybrid organic–inorganic (CH3NH3PbX3) all-inorganic (CsPbX3) lead (X=Cl, Br, I) NCs, consider properties related...

Aqueous solutions containing light-absorbing nanoparticles have recently been shown to produce steam at high efficiencies upon solar illumination, even when the temperature of bulk fluid volume remains far below its boiling point. Here we show that this phenomenon is due a collective effect mediated by multiple light scattering from dispersed nanoparticles. Randomly positioned both scatter and absorb are able concentrate energy into mesoscale volumes near illuminated surface liquid. The...

Carbon dots (CDs) have attracted rapidly growing interest in recent years due to their unique and tunable optical properties, the low cost of fabrication, widespread uses. However, complex structure CDs, both molecular ingredients intrinsic mechanisms governing photoluminescence CDs are poorly understood. Among other features, a large Stokes shift over 100 nm spectrally dependent on excitation wavelength so far not been adequately explained. In this Letter we investigate develop model system...

Au nanoparticles with plasmon resonances in the near-infrared (NIR) region of spectrum efficiently convert light into heat, a property useful for photothermal ablation cancerous tumors subsequent to nanoparticle uptake at tumor site. A critical aspect this process is size, which influences both and efficiency. Here, we report direct comparative study ∼90 nm diameter nanomatryoshkas (Au/SiO2/Au) ∼150 nanoshells therapeutic efficacy highly aggressive triple negative breast cancer (TNBC) mice....

When plasmonic nanostructures serve as the metallic counterpart of a metal-semiconductor Schottky interface, hot electrons due to plasmon decay are emitted across barrier, generating measurable photocurrents in semiconductor. nanostructure is atop semiconductor, only small percentage excited with wavevector permitting transport barrier. Here we show that embedding structures into semiconductor substantially increases electron emission. Responsivities increase by 25× over planar diodes for...

High-quality hybrid halide perovskite nanocrystals are fabricated through a simple, versatile, and efficient two-step process involving dry step followed by ligand-assisted liquid-phase exfoliation step. The emission wavelength of the resulting can be tuned either composition varying content or reducing their thickness.

Carbon dots (CDs) are an intriguing fluorescent material; however, due to a plethora of synthesis techniques and precursor materials, there is still significant debate on their structure the origin optical properties. The two most prevalent mechanisms explain them based polycyclic aromatic hydrocarbon domains small molecular fluorophores, for instance, citrazinic acid. Yet, how these form whether they can exist simultaneously under study. To address this, we vary hydrothermal time CDs...

The colloidal synthesis and assembly of semiconductor nanowires continues to attract a great deal interest. Herein, we describe the single-step ligand-mediated single-crystalline CsPbBr3 perovskite (NWs) directly from precursor powders. Studies reaction process morphological evolution revealed that initially formed nanocubes are transformed into NWs through an oriented-attachment mechanism. optical properties can be tuned across entire visible range by varying halide (Cl, Br, I) composition...

Carbon dots (CDs) are a versatile nanomaterial with attractive photoluminescent and photocatalytic properties. Here we show that these two functionalities can be easily tuned through simple synthetic means, using microwave irradiation, citric acid varying concentrations of nitrogen-containing branched polyethyleneimine (BPEI) as precursors. The amount BPEI determines the degree nitrogen incorporation different inclusion modes within CDs. At intermediate levels BPEI, domains grow containing...

Metal halide perovskites have emerged as a promising new class of layered semiconductor material for light‐emitting and photovoltaic applications owing to their outstanding optical optoelectronic properties. In nanocrystalline form, these exhibit extremely high photoluminescence quantum yields (PLQYs) show confinement effects analogous conventional semiconductors when dimensions are reduced sizes comparable respective exciton Bohr radii. The reduction in size leads strongly blueshifted large...

Abstract Self‐assembly of nanoscale building blocks into ordered nanoarchitectures has emerged as a simple and powerful approach for tailoring the properties opportunities using these development novel optoelectronic nanodevices. Here, one‐pot synthesis CsPbBr 3 perovskite supercrystals (SCs) in colloidal dispersion by ultrasonication is reported. The growth SCs occurs through spontaneous self‐assembly individual nanocrystals (NCs), which form highly concentrated solutions precursor powders....

Assembling nanoparticles into well-defined structures is an important way to create and tailor the optical properties of materials. Most advances in metamaterials research date have been based on fabricated two-dimensional planar geometries. Here, we show efficient method for assembling noble metal stable, three-dimensional (3-D) clusters, whose can be highly sensitive or remarkably independent cluster orientation, depending particle number geometry. Some such as tetrahedra icosahedra, could...

Current colloidal synthesis is able to produce an extensive spectrum of nanoparticles with unique optoelectronic, magnetic, and catalytic properties. In order exploit them in nanoscale devices, flexible methods are needed for the controlled integration on surfaces few-nanometer precision. technologies usually involve a combination molecular self-assembly surface patterning by diverse lithographic like UV, dip-pen, or microcontact printing.(1,2) Here we demonstrate direct laser printing...

Perovskite nanocrystals (NCs) are an important extension to the fascinating field of hybrid halide perovskites. Showing significantly enhanced photoluminescence (PL) efficiency and emission wavelengths tunable through content size, they hold great promise for light-emitting applications. Despite rapid advancement in this field, physical nature size-dependent excitonic properties have not been well investigated due challenges associated with their preparation. Herein we report spontaneous...

The development of remotely controlled nanoscopic sources heat is essential for investigating and manipulating temperature sensitive processes at the nanoscale. Here, we use single gold nanoparticles to rapidly deposit amounts in regions defined size. This allows us induce control nanoscale reversible gel-fluid phase transitions phospholipid membranes. We exploit optical over transition determine velocity fluid front into gel membrane guide specific locations. These results illustrate how...

This feature article discusses the optical trapping and manipulation of plasmonic nanoparticles, an area current interest with potential applications in nanofabrication, sensing, analytics, biology medicine. We give overview over basic theoretical concepts relating to forces, plasmon resonances heating. discuss fundamental studies particles traps temperature profiles around them. place a particular emphasis on our own work employing optically trapped nanoparticles towards biomimetic objects sensing.

For high-speed optoelectronic applications relying on fast relaxation or energy-transfer mechanisms, understanding of carrier and recombination dynamics is critical. Here, we compare the differences in photoexcited two-dimensional (2D) quasi-three-dimensional (quasi-3D) colloidal methylammonium lead iodide perovskite nanoplatelets via differential transmission spectroscopy. We find that cooling excited electron-hole pairs by phonon emission progresses much faster intensity-independent 2D...

With the demand for renewable energy and efficient devices rapidly increasing, a need arises to find optimize novel (nano)materials. sheer limitless possibilities material combinations synthetic procedures, obtaining novel, highly functional materials has been tedious trial error process. Recently, machine learning emerged as powerful tool help syntheses; however, most approaches require substantial amount of input data, limiting their pertinence. Here, three well-known machine-learning...

We investigate the optical properties of four different samples ZnO nanocrystals, with a particle size average varying from 70 up to 380nm. The photoluminescence (PL) all shows at low temperature an emission band around 3.31eV, which is several orders magnitude stronger compared PL bulk this energy. This clear dependence on surface volume ratio nanocrystals and therefore assigned states. Temperature dependent measurements reveal that plays major role room for examined powders. Additionally,...