In this paper, we explore a two-step treatment method to modify the Ti wires which are used as anode substrates of fiber dye sensitized solar cells (FDSSCs). A special kind of network nanoporous ...structure is formed on the surface of Ti wire substrates through sodium hydroxide hydrothermal reaction and titanium tetrachloride (TiCl sub(4)) assistant treatment. Nanoporous structures with different sizes are in-situ grown on the Ti wire substrates by changing the hydrothermal reaction condition. Then, TiO sub(2) network nanoporous structures with branch-like nano-structure or 2D nanoflakes are obtained after TiCl sub(4) treatment. The effects of these network nanoporous structures on the FDSSC performances are investigated intensively. It is found that these special network nanoporous structures between TiO sub(2) nanoparticle active layer and Ti wire substrate are beneficial to the connection of the nanoparticle layer and fiber-shaped substrate, thus improving the electron transport rate and prolonging electron lifetime. As a result, the power conversion efficiency of this parallel assembled FDSSC increases to 4.64% from 2.56% after this two-step treatment.
Jong Hak Kim and co-workers report a unique, effective design structure for a photoanode, consisting of an SnO sub(2) nanotube-TiO sub(2) nanosheet core-shell (SNTNS), interdispersed in an organized ...mesoporous TiO sub(2) film. The high efficiency results from the effects of combining the well-organized structure of the TiO sub(2) film and the excellent electron transport, as well as the good light scattering of SNTNS.
In this work, we prepare the TiO sub(2) nanoparticle film and anatase TiO sub(2) nanoarray film, and we achieve the polymerizations of thiophene using the photoexcited TiO sub(2) film as the ...initiators. It is measured that the in situ polymerizations of thiophene take place on the surfaces of the two films. The growth of polythiophene (PTh) on the TiO sub(2) nanoarray is monitored using Fourier-transform Raman spectroscopy. The TiO sub(2) nanoarray is found to strongly interact with the PTh polymers. It is observed using scanning electron microscope that the microspores in the nanoarray are filled by the polymers after the reaction of 3 h, and the nanoarray is fully covered by the polymer layer when the polymerization lasts for 5 h. The PTh-TiO sub(2) nanoarray composite films are measured for the transient photocurrents and photocurrent-voltage characteristics. The dependence of the photocurrents on the reaction time is revealed and discussed. copyright 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40187.
La parte fundamental para producir nanocompuestos es tener un mezclado que permita la total interacción de las nanopartículas con la matriz polimérica, sin esto se tendrán las propiedades de un ...microcompuesto con pobre dispersión. La gran área de superficie de las nanopartículas crea en el nanocompuesto un gran volumen de material interfacial con propiedades diferentes al del polímero virgen. Sin embargo, estos materiales abren nuevas posibilidades de aplicación en la áreas de biomedicina, almacenamiento de energía, barrera a los gases, antimicrobiales, biodegradables, magnéticas, ópticas, biosensores, propiedades térmicas, etc., seguramente la investigación en este campo seguirá creciendo de manera sostenida durante algunas décadas más.
Novel K3V2(PO4)3 and three-dimensional conductive network K3V2(PO4)3/C nanocomposites are successfully fabricated and further evaluated as cathode materials for potassium-ion batteries for the first ...time. The K3V2(PO4)3/C nanocomposite exhibits a high-potential platform of 3.6-3.9 V and a good capacity retention of at least 100 cycles. This work may provide new insight into developing cathode materials for potassium-ion batteries.
Orthorhombic titanic acid nanotubes (TAN) have large BET surface area and small-diameter one-dimensional nanotubular morphology, so they can work as a good supporter and a precursor of TiO sub(2). ...However, in our former research, we found that calcination of TAN to anatase TiO sub(2) would destroy the nanotubular structure and decrease the BET surface area sharply. In this work, we utilized the pillar effect of the foreign nanoparticles (La sub(2)O sub(3)) to keep the nanotubular morphology of TiO sub(2), and obtained the anatase TiO sub(2) nanotubes with large BET surface area. For improving the photocatalytic activity, Pd nanoparticles were loaded as the electron traps on the surface of La-doped TiO sub(2) by photo-deposition method. The photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, diffuse reflectance spectra, and N sub(2) adsorption-desorption isotherms measurement. Their photocatalytic activities were evaluated by the removal of propylene under visible light irradiation ( lambda greater than or equal to 420 nm). The results showed that the photocatalytic activity of Pd-loaded La-doped TiO sub(2) nanotubes improved effectively compared with that of La-doped TiO sub(2) and pure TiO sub(2).
Display omitted
•Sonication-assisted deposition-precipitation and hydrothermal method have been used to fabricate AgI/g-C3N4 nanocomposites.•Different preparation procedures affected the morphology, ...purity, and size of the product.•The as-prepared AgI/g-C3N4 nanocomposites possessed higher photocatalytic activity than the pure AgI and g-C3N4.•AgI/g-C3N4 nanocomposites could be a great antimicrobial agent.
Silver iodide/graphitic carbon nitride nanocomposites have been successfully fabricated through sonication-assisted deposition-precipitation route at room temperature and hydrothermal method. Varied mass ratios and preparation processes can modify the structure, purity, shape, and scale of specimens. The purity of the product was confirmed by Energy Dispersive X-Ray Spectroscopy (EDS) and X-ray crystallography. The morphology and size of specimens could be observed with transmission electron microscopy (TEM) and field emission scanning electron microscopy (FESEM). The bandgap was evaluated around 2.82 eV for pure g-C3N4. The bandgap has reduced to 2.70 eV by increasing the quantity of silver iodide in the nanocomposites. The photocatalytic activity of AgI/C3N4 has been studied over the destruction of rhodamine B (RhB) and methyl orange (MO) through visible radiation due to their suitable bandgap. The as-prepared AgI/C3N4 nanocomposites photocatalyst revealed better photocatalytic behavior than the genuine AgI and C3N4 which ascribed to synergic impacts at the interconnection of C3N4 and AgI. Furthermore, these nanocomposites have great potential for being a great antibacterial agent.
PDF
