Poly(vinylpyrrolidone)-encapsulated Bi2 Se3 nanosheets with a thickness of 1.7 nm and diameter 31.4 are prepared by solution method. Possessing an extinction coefficient 11.5 L g(-1) cm(-1) at 808 nm, the ultrathin boast high photothermal conversion efficiency 34.6% excellent photoacoustic performance. After systemic administration, proper size surface properties accumulate passively in tumors enabling efficient imaging entire to facilitate cancer therapy. In vivo biodistribution studies...

Abstract A three‐plasmon hybrid, in which core–shell Au@Cu 2−x S hybrids are bonded with ultrathin Ti 3 C 2 T x MXene, is prepared for high‐efficiency photothermal conversion and membrane‐based solar water evaporation the first time. The MXene/Au nanorod@Cu display excellent efficiency under irradiation of an 808 laser, causing by three‐plasmon‐induced synergistic plasmonic absorption heating effects as well multichannel charge transfer between components. Then, Au nanosphere@Cu mixed...

A novel strategy is proposed to directly synthesize water-soluble hexagonal NaYF4 nanorods by doping rare-earth ions with large ionic radius (such as La3+, Ce3+, Pr3+, Nd3+, Sm3+, Eu3+, and Gd3+), the dopantcontrolled growth mechanism studied. Based on effect, we fabricated NaYF4:(Yb,Er)/La NaYF4:(Yb,Er)/Ce nanorods, which exhibited much brighter upconversion fluorescence than corresponding cubic forms. The sizes of can be adjusted over a broad range changing dopant concentration reaction...

Abstract The synthesis of large lattice mismatch metal‐semiconductor core–shell hetero‐nanostructures remains challenging, and thus the corresponding optical properties are seldom discussed. Here, we report gold‐nanorod‐seeded growth Au–CdS hetero‐nanorods by employing Ag 2 S as an interim layer that favors CdS shell formation through a cation‐exchange process, subsequent growth, which can form complete structures with controllable thickness. Exciton–plasmon interactions observed in nanorods...

The design of new functional materials with excellent hydrogen production activity under visible‐light irradiation has critical significance for solving the energy crisis. A well‐controlled synthesis strategy is developed to prepare an Au–Pt–CdS hetero‐nanostructure, in which each component Au, Pt, and CdS direct contact other two materials; Pt on tips a layer along sides Au nanotriangle (NT), exhibits photocatalytic light ( λ > 420 nm). sequential growth surfactant‐dependent deposition...

NdF3/SiO2 nanoparticles demonstrate highly efficient fluorescence due to successful suppressions of concentration quenching and surface quenching. More interestingly, their excitation emission peaks with large frequency separation are both in the "near-infrared optical window" biotissues. In living animal studies, detecting depth can reach 1 cm by using a small dose such nanomaterials.

We theoretically investigate the plasmon coupling in metallic nanorod dimers. A pronounced dip is found extinction spectrum due to plasmonic Fano resonance, which induced by destructive interference between bright dipole of a short and dark quadrupole long nanorod. This can also be explained as modes both supported whole dimer. The resonance tuned adjusting spatial or spectral separation two nanorods

The metallic nanostructures with unique properties of tunable plasmon resonance and large field enhancement have been cooperated semiconductor to construct hetero‐nanostructures for various applications. Herein, a general facile approach synthesize uniform dumbbell‐like gold–sulfide core–shell is reported. transformation from Au nanorods (NRs) NRs coating metal sulfide shells (including Bi 2 S 3 , CdS, Cu x S, ZnS) are achieved in one‐pot reaction. Due the reshaping core deposition shell,...

For the first time, a new near-IR "turn-on" fluorescent chemosensor with high selectivity for Hg(2+) ions was designed according to twisted intramolecular charge transfer (TICT) mechanism. The selective fluorescence enhancement effect can be optimized by modulating solvent systems. And this naphthalenedimide-based sensor long wavelength absorption and emission used image intracellular in living Hela cells.

We theoretically investigated optical third-order nonlinearity of a coherently coupled exciton-plasmon hybrid system under strong control field with weak probe field. The analytic formulas exciton population and effective susceptibility the metal nanoparticle (MNP) semiconductor quantum dot (SQD) were deduced. bistable induced nonlinear absorption refraction response revealed. bistability region can be tuned by adjusting size nanoparticle, interparticle distance intensity Our results have...

As the most common nonlinear optical process, second harmonic generation (SHG) has important application value in field of nanophotonics. With rapid development metal nanomaterial processing and chemical preparation technology, various structures based on nanoparticles have been used to achieve enhancement modulation SHG. In optics, plasmonic nanostructures become potential candidates for optoelectronic devices because their highly adjustable physical characteristics. this article, first,...

Abstract Semiconductor heterojunctions have garnered extensive interest in photocatalytic hydrogen generation, yet the limited light absorption and charge transfer efficiencies still restrict performance. The topological insulator has unique surface states high‐mobility electrons, demonstrating significant potential for enhancing photocatalysis. Herein, a ternary photocatalyst based on insulator, which CdS ZnS nanoparticles are grown Bi 2 Se 3 nanotube, is prepared efficient photocatalysis...

We studied theoretically the exciton coherent dynamics in hybrid complex composed of CdTe quantum dot (QDs) and rodlike Au nanoparticles (NPs) by self-consistent approach. Through adjusting aspect ratio NPs, radiative rate nonradiative energy transfer from QD to NP are tunable wide range 0.05-4 ns(-1) 4.4 x 10(-4) 2.6 ns(-1), respectively; consequently, period Rabi oscillations population is 0.6 pi-9 pi.

The self-assembled chitosan CdSe quantum dots (QDs) and CdSe-ZnS core-shell QDs films have been prepared by using layer-by-layer electrostatic technique. well-ordered nanostructure the deposition of are revealed AFM exciton absorption spectra, respectively. optical nonlinearity composite were studied Z-scan technique with femtosecond pulses at wavelength 790 nm, value third-order susceptibility measured to be about 1.1 x 10(-8) esu, which is 200% larger than that 5.3 10(-9) esu. This has...

We report on controlled synthesis of uniform LnVO4 (Ln = Ce and Nd) nanocrystals (NCs) with square-plate H-shaped morphologies in nanosized reverse microemulsion reactors, via a facile solvo/hydrothermal strategy. The NCs were thoroughly characterized by X-ray diffraction, transmission electron microscopy (TEM), atomic force (AFM), energy-dispersive spectroscopy (EDS), infrared absorption spectroscopy, photoluminescence. Possible mechanisms the rare-earth orthovanadate NC growth size shape...

We investigate the optical response of a gold nanorod array coupled with semicontinuous nanoparticle film. find that, as film is adjusted to percolating regime, nanorod-film hybrids are tuned into plasmonic Fano resonance, characterized by coherent coupling discrete modes continuum band Consequently, transmission substantially enhanced. Even more strikingly, electromagnetic fields around become much stronger, reflected 2 orders magnitude enhancement in avalanche multiphoton luminescence....

Two strategies have been explored for organic functionalizations of ZnO nanotetrapods via anchoring groups carboxylate and phosphonate. With these methods, oleyl chains were assembled on the surfaces nanotetrapods, significantly enhancing their solubility in nonpolar solvents, such as chloroform toluene. The surface functionalization extended to electroactive photoactive molecules protoporphyrin C(60) nanotetrapods. surface-modified characterized comprehensively, revealing a uniform,...

Localized surface plasmon resonances (LSPRs) of metal nanostructures are highly related to the shape, which could greatly enhance light–matter interaction at nanoscale. Here, we investigate LSPRs gold nanostars corresponding unique morphology and demonstrate surface-enhanced Raman scattering (SERS) activities nonlinear refraction properties two typical structures. By adjusting synthesis condition, main resonance be tuned from 557 760 nm. The modes intense field enhancement near sharp tips...

This paper describes a facile method for synthesis of Au–AgCdSe hybrid nanorods with controlled morphologies and spatial distributions. The involved deposition Ag tips at the ends Au nanorod seeds, followed by selenization overgrowth CdSe on these sites. By simply manipulating pH value system, AgCdSe could selectively grow one end, both or side surface nanorod, generating mike-like, dumbbell-like, toothbrush-like respectively. These three types displayed distinct localized plasmon resonance...

Nest-like CdS–reduced graphene oxide (CdS–rGO) composites were prepared through a one-pot solvothermal method in which ethylenediamine was used to reduce GO and control the morphology of CdS, L-cysteine as sulfur source, reducing agent, linker between CdS rGO. By examining morphology, structure, composition composites, it could be found that nest-like particles decorated on rGO sheet, addition did not influence crystal structure shape CdS. Compared with pure as-prepared CdS–rGO showed...

The controllable synthesis of uniform tungsten diselenide (WSe2 ) is crucial for its emerging applications due to the high sensitivity extraordinary physicochemical properties layer numbers. However, undesirable multilayer regions inevitably form during fabrication WSe2 via traditional chemical vapor deposition process resulted from lack significantly energetically favorable competition between accumulation and size expansion. This work innovatively introduces Cu occupy hexagonal site...