Materials Literature
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Sequential boronate esterification of benzene-1,4-diboronic acid with pentaerythritol induced hierarchical molecular self-assembly to produce mono-dispersed flower-like microparticles. ATR-FT-IR, PXRD, 13C-CP-MAS and 11B-DD-MAS NMR spectra indicate that the particles consist of zigzag-shaped packing structures of poly…
Solvent vapour annealing (SVA), which consists of exposing the active layer of organic films to a vapour of solvent directly after deposition, has been used in small molecule bulk heterojunction (SM-BHJ) solar cell devices whose active layer consisted of 3,6-bis(5-(benzofuran-2-yl)thiophen-2-yl)-2,5-bis(2-ethylhexyl)p…
Dendritic materials are attractive as catalysts due to their highly ordered structure and high surface area. Herein, we report a NiFe dendritic nanostructure obtained by a simple electrodeposition without template. The control of concentration, potential, and pH plays an important role in the formation of the dendriti…
An amenable method for improving rate performance of Li4Ti4.85Al0.15O12 electrode by post-synthesis treatment in formaldehyde aqueous solution at room temperature is introduced. The as-prepared samples are characterized by XRD, BET, SEM, HR-TEM, XPS and electronic conductivity measurement. The treatment causes no noti…
International audience
A novel one-dimensional (1D) V2O3@carbon nanocomposite has been successfully synthesized for the first time. In the synthesis procedure, the previously obtained V2O5·xH2O nanobelts act as template. By coating the nanobelts with a layer of polymerized C species under hydrothermal conditions followed by a calcination tr…
Two new oligothiophene derivatives of the acceptor–donor–acceptor type, incorporating double rhodanine or 1,3-dimethylpyrimidine-2,4,6(1H,3H,5H)-trione units as the terminal acceptor groups, D2R(8 + 2)7T and DTDMP7T, have been designed and synthesized for solution-processable small molecule BHJ solar cells. The impact…
Replacing benzodithiophene (BDT) with a naphthodithiophene (NDT) building block, PNDTDPP exhibited enhanced photovoltaic performance with a PCE of 5.37% when compared with BDT-based copolymer PBDDPP, which gave a PCE of 2.91% in conventional device structures. Encouragingly, the obtained inverted PSC with PBDDPP achie…
The oxime click reaction is shown to be a straightforward methodology for the synthesis of poly(ethylene glycol) (PEG)-polysaccharide diblock copolymers. The method is applicable to unmodified polysaccharides with a reductive end as demonstrated for dextran, hyaluronic acid and chitosan. Notably the oxime click reacti…
A flexible, dye-sensitized solar cell based on low-cost metal fibers as the substrates is designed. This cell provides a breakthrough on the traditional sandwich-type flat-cell structure. It has good flexibility even without a transparent conductive oxide. Moreover, the new solar cell can generate electric power with…
A strategy is proposed and developed to promote Li+ diffusion in polyanion cathode materials such as 0.8Li2FeSiO4/0.4Li2SiO3/C with the incorporation of Li2SiO3 as a lithium ionic conductive matrix. It is shown that the presence of Li2SiO3 separates the Li2FeSiO4 particles into small domains of a few nanometres and pr…
In conjunction with environmentally benign ionic liquid electrolytes, vertically-aligned carbon nanotubes (VA-CNTs) sheathed with and without a coaxial layer of vanadium oxide (V(2)O(5)) were used as both cathode and anode, respectively, to develop high-performance and high-safety lithium-ion batteries. The VA-CNT ano…
A series of ordered photoanodic architectures (including ordered TiO(2) nanotube arrays (TNT), ZnO nanorods, ZnO/TiO(2) core/shell nanostructures) for CdS/CdSe sensitized solar cells (QDSCs), were fabricated directly on transparent conductive oxide glasses by a facile sol-gel assisted template process. The morphologie…
Although a multitude of microporous coordination polymers (MCPs) with ultrahigh surface area have been reported in the last decade, none of these can come close to matching the cost/performance ratio of conventional sorbents such as zeolites and carbons for most applications. There is a need to drastically reduce the…
It is demonstrated that the power conversion efficiency (PCE) of organic photovoltaic devices can be increased by inserting an ultrathin film of a ferroelectric co-polymer, poly(vinylidenefluoride-trifluoroethylene) (P(VDF-TrFE)), at the metal–organic interface, due to an enhancement of the charge extraction efficienc…
A graphene-based nanostructure with expanded Li(+) transport channels is reported, which is characterized by high capacity and excellent rate performance as an anode material for Li-ion batteries. The expanded structure is obtained by employing linear polymers as the spacers in the stacking process of graphene nanoshe…
We have developed 4-(bis(9,9-dimethyl-9H-flouren-2-yl)amino)benzoic acid (HC-Acid) to use as an alternative co-adsorbent to deoxycholic acid (DCA) in organic dye-sensitized solar cells (DSSCs). It has dual functioned effects, that is, the prevention effect of the π–π stacking of organic dye molecules like DCA and the…
Free-standing, flexible V 2 O 5 -graphene composite films were prepared by simple filtration of aqueous dispersions of V 2 O 5 nanowires and graphene sheets. V 2 O 5 nanowires were preferentially oriented along the plane of the film as they were sandwiched between stacked graphene sheets in the composite film. The V 2…
A novel direct-write approach is presented, which relies on area-selective atomic layer deposition on seed layer patterns deposited by electron beam induced deposition. The method enables the nanopatterning of high-quality material with a lateral resolution of only ∼10 nm. Direct-write ALD is a viable alternative to l…
Porphyrins bearing a polyaromatic or a heterocyclic group are prepared to study their fundamental and photovoltaic properties. Solar cells sensitized with a fluorene-modified porphyrin outperform other dyes in the series, reaching ~90% efficiency of N719 dye.