Search

As a template, mesoporous silica membranes were used to trap Ag or Au nanoparticles into their channels without aggregation, contributing to large third-order nonlinear optical susceptibilities. We compared the susceptibility values of the composite mesoporous membranes synthesized by different electrodeposition methods. Results show that differential pulse amperometry (DPA) electrodeposition method gives rise to larger susceptibilities than that by potentiostatic electrodeposition method. DPA electrodeposition provides buffer time for Ag ions to diffuse to the reaction interface to supply Ag ions concentration, resulting more in-channel Ag nanoparticles. Among the synthesized composite membranes loaded with Ag, samples synthesized by DPA method in lower electrolyte concentration possess the largest susceptibility, which agrees well with results of XRD patterns and HR-TEM images. Similarly, the synthesized composite membranes loaded with Au also show the best susceptibility using this strategy under optimal voltage of −0.2 V.

In this paper, citrate-stabilized CuS nanocrystals were modified by NH 2 -terminated aptamer of carcinoembryonic antigen to fabricate aptamer-CuS complex via carbodiimide-activated coupling. Then, the complex was conjugated with graphene oxide (GO) to form aptamer-CuS/GO conjugates via π-π stacking interactions. Finally, glucosamine (Glu) was loaded into aptamer-CuS/GO conjugates to prepare aptamer-CuS/GO/Glu composites. The composites enabled CEA-targeted and pH-sensitive Glu release. Under near-infrared light irradiation at 980 nm, the composites had photothermal-accelerated release of Glu and chemo-photothermal synergistic therapy in vitro . Due to combined advantages from tumor biomarker-targeted, pH-sensitive, photothermal-accelerated drug release, as well as chemo- photothermal therapy, the composites could be developed towards multifunctional drug-delivery systems for highly efficient treatment against tumor cells.

A new solid solution of (1−x) Bi0.5Na0.5TiO3–x BaCo0.5Nb0.5O3 (BNT-BCN; x = 0, 0.05, 0.10, 0.15, 0.20) were fabricated via the solid-state route. All the samples reflect single perovskite structure and normal ferroelectric behavior. The lowest band gap ~0.92 eV of Bi0.5Na0.5TiO3 doped with BaCo0.5Nb0.5O3 is achieved. Under simulated standard sunlight, the short-circuit photocurrent (Jsc) of ~34.15 µA/cm2 and open-circuit photovoltage (Voc) of ~10.24 V in the 0.90BNT-0.10BCN ceramic after the polarization of 60 kV/cm are obtained, which is much higher than that of the most perovskite-oxide ceramics. The power conversion efficiency of the 0.90BNT-0.10BCN is about 0.17%. The current system shows considerable advantages in the field of high-stability photovoltaic devices.

ZnS/MWCNTs composite materials with different concentrations of ZnS were prepared and their third-order nonlinear optical properties were studied through experiments and theoretical analysis. Structure and morphology characterizations of the ZnS/MWCNTs composite materials showed that ZnS quantum dots (QDs) were uniformly attached on the surface of MWCNTs. Third-order nonlinear optical properties of all the MWCNTs samples, ZnS QDs and ZnS/MWCNTs composite materials were measured by using Z-scan technique with a picosecond pulse laser. Experimental results showed that the composite materials always presented saturated absorption properties of MWCNTs and a negative nonlinear refraction effect of ZnS.

Perovskite-oxide ferroelectric semiconductors were widely concerned in photovoltaic applications due to its excellent optical absorption and thermal stability. In this work, BaxBi0.5-0.5xAg0.05-0.5xNa0.45Ti1-xNi0.5xNb0.5xO3 ceramics (abbreviation as BANT-xBNN) were successfully prepared by using a solid-state reaction method. All the ceramics illustrate perfect ferroelectric behavior. The addition of BaNi0.5Nb0.5O3 can substantially reduce the band gap of Ag doped Bi0.5Na0.5TiO3 material to ~2.3 eV. The short-circuit current (Jsc) and the open-circuit voltaic (Voc) of the selected BANT-0.04BNN ceramic poled at 2.0 kV, is 2.79 nA/cm2 and 0.54 V, respectively. The novel BANT-xBNN system has broad application prospects for ferroelectric photovoltaic devices.