Dialkylated dibenzo[,]anthracenes for solution-processable organic thin-film transistors.

Here, two alkylated dibenzo[,]anthracene (DBA) derivatives with linear -dodecyl (C12-DBA-C12) and ring-containing pentyl-cyclohexyl (Cy5-DBA-Cy5) moieties were successfully synthesized. Their chemical and thermal stability were both notably high, with the molecular arrangement of C12-DBA-C12 and Cy5-DBA-Cy5 being greatly influenced by the alkyl groups. C12-DBA-C12 formed a 2D lamellar herringbone packing structure and its blade-coated film exhibited high layered crystallinity and high carrier mobility up to 2.

Sediment contamination alters the submersed macrophyte Vallisneria natans and root-associated microbiome profiles during phytoremediation.

The submerged plant Vallisneria natans plays an important role in the remediation of polycyclic aromatic hydrocarbon (PAH)-contaminated sediments. In this study, V. natans and sediments were collected from different V.

Giant tunnel resistance effect in (SrTiO)/(BaTiO)/(CaTiO) asymmetric superlattice with enhanced polarization.

In this work, we report the effectively enhanced tunneling electroresistance effect in Au/(SrTiO)/(BaTiO)/(CaTiO)/Nb:SrTiO superlattice ferroelectric tunnel junction (FTJ). The stable polarization switching and enhanced ferroelectricity were achieved in the nanoscale thickness high-quality epitaxial superlattice. A high ON/OFF current ratio of more than 10 was obtained at room temperature, which is an order of magnitude larger than the BaTiO FTJ with the same structure.

Enhanced photoluminescence of double perovskite CsSnI nanocrystals via Na doping.

Double perovskites without lead element have attracted great attention in recent years. Further increasing the photoluminescence quantum yield of lead-free double perovskites is necessary for their potential applications. In this work, Na doped CsSnI nanocrystals were synthesized by hot injection method.

Study on the Up-Conversion Luminescence and Conductivity Behavior of p-Type NiO:Yb,Er Thin Films.

In this work, Li-doped NiO:Yb,Er thin films are obtained via pulsed laser deposition. It was found that the films exhibit high transparency in the visible region and clearly red up-conversion luminescence under 980 nm excitation. Doping with Li can adjust the up-conversion emission intensity of the films.

Asymmetric liquid crystalline dibenzo[,]anthracenes for organic semiconductors with high mobility and thermal stability.

A series of asymmetric organic semiconductors based on N-shaped dibenzo[,]anthracene (DBA), Ph-DBA-C ( = 8, 10, 12), were developed. All Ph-DBA-C compounds had good chemical stability and smectic LC qualities, and thermally stable crystal phase can be maintained under 190 °C due to the suppressed molecular motions by the bent DBA core. High-quality crystalline films can be fabricated using a blade-coating technique.

New Approach to Low-Power-Consumption, High-Performance Photodetectors Enabled by Nanowire Source-Gated Transistors.

Power consumption makes next-generation large-scale photodetection challenging. In this work, the source-gated transistor (SGT) is adopted first as a photodetector, demonstrating the expected low power consumption and high photodetection performance. The SGT is constructed by the functional sulfur-rich shelled GeS nanowire (NW) and low-function metal, displaying a low saturated voltage of 0.

Modifying Jahn-Teller distortion by epitaxial stress in LaMnOfilms for tunning electron localization.

The effect of epitaxial stress on Jahn-Teller (JT) distortion in epitaxial LaMnO(LMO) films has been investigated. Both-scans and reciprocal space maps (RSMs) indicate that LMO samples are subjected to compressive stress. Obvious Laue oscillations can be detected in-scans, indicating the high quality of samples.

Enhanced photoluminescence of CsPbBrI nanocrystals via plasmonic Au nanoarrays.

Large scale ordered Au nanoarrays are fabricated by nanosphere lithography technique. The photoluminescence improvement of CsPbBrI nanocrystals by more than three times is realized in the CsPbBrI nanocrystal/Au nanoarray/Si structure. Time-resolved photoluminescence decay curves indicate that the lifetime is decreased by introducing the Au nanoarrays, which results in a increasing radiation recombination rate.

Enhanced upconversion red light emission of TiO:Yb,Er thin film via Mn doping.

TiO:Yb,Er films with different concentrations of Mn are grown on SiO glass substrates by pulsed laser deposition. It is found that the introduction of Mn enhanced the intensity of upconversion emission. In particular, TiO:Yb,Er thin film with 5% Mn ions exhibits the brightest upconversion emission.

Enhancing the bulk photovoltaic effect by tuning domain walls in epitaxial BiFeOfilms.

In this letter, the role of domain wall (DW) on bulk photovoltaic effect (BPV) effect in BiFeO(BFO) films was studied by x-ray reciprocal space mapping and conductive atomic force microscope. It was found that the domain structure and DW can be tuned by controlling the epitaxial orientation of BFO film. Remarkably, under 1 sun AM 1.

Highly Conductive P-Type MAPbI Films and Crystals via Sodium Doping.

To regulate the optical and electrical properties of the crystals and films of the intrinsic methylammonium lead iodide (CHNHPbI), we dope them with sodium (Na) by selecting sodium iodide (NaI) as a dopant source. The highly conductive p-type sodium-doped CHNHPbI (MAPbI: Na) perovskite single crystals and thin films are successfully grown using the inverse temperature crystallization (ITC) method and antisolvent spin-coating (ASC) method, respectively. With the increase of Na doping concentration, the grain size of the film increases, the surface becomes smoother, and the crystallinity improves.

Continuous, Ultra-lightweight, and Multipurpose Super-aligned Carbon Nanotube Tapes Viable over a Wide Range of Temperatures.

In extreme environments, such as at ultrahigh or ultralow temperatures, the amount of tape used should be minimal so as to reduce system contamination and unwanted residues. However, tapes made from conventional materials typically lose their adhesiveness or leave residues difficult to remove under such conditions. Thus, the development of more versatile, lightweight, and easily removable tapes for applications in such extreme environments has received considerable attention.

Laser-Induced Flash-Evaporation Printing CHNHPbI Thin Films for High-Performance Planar Solar Cells.

Organic-inorganic hybrid perovskites have been emerging as promising light-harvesting materials for high-efficiency solar cells recently. Compared to solution-based methods, vapor-based deposition technologies are more suitable in preparing compact, uniform, and large-scale perovskite thin films. Here, we utilized flash-evaporation printing (FEP), a laser-induced ultrafast single source evaporation method employing a carbon nanotube evaporator, to fabricate high-quality methylammonium lead iodide perovskite thin films.

Crystalline multiwall carbon nanotubes and their application as a field emission electron source.

Using super-aligned carbon nanotube (CNT) film, we have fabricated van der Waals crystalline multiwall CNTs (MWCNT) by adopting high pressure and high temperature processing. The CNTs keep parallel to each other and are distributed uniformly. X-ray diffraction characterization shows peaks at the small angle range, which can be assigned to the spacing of the MWCNT crystals.

Design, synthesis and in vitro biological evaluation of novel [1,2,3]triazolo[4,5-d]pyrimidine derivatives containing a thiosemicarbazide moiety.

A series of hybrid molecules containing [1,2,3]triazolo[4,5-d]pyrimidine and thiosemicarbazide moieties were designed, synthesized and evaluated for their antiproliferative activities against MGC-803, NCI-H1650 and PC-3 human cancer cells. Some of the synthesized compounds showed moderate to good activity against three selected cancer cell lines. Among these compounds, compound 29 displayed the most potent antiproliferative activity as well as good selectivity between cancer cells and normal cells.

Design, synthesis, and biological evaluation of new thiazolo[5,4-]pyrimidine derivatives as potent antiproliferative agents.

A series of thiazolo[5,4-]pyrimidine derivatives were synthesized and evaluated for their antiproliferative activities against several human cancer cell lines. Structure-activity relationship studies were carried out, showing that most of the target compounds had good inhibition against the tested cell lines. Among them, compound exhibited potent inhibition against human gastric cancer cells MGC-803 and HGC-27 with IC values of 4.

Identification of thiazolo[5,4-d]pyrimidine derivatives as potent antiproliferative agents through the drug repurposing strategy.

A series of thiazolo[5,4-d]pyrimidine derivatives were synthesized and evaluated for their antiproliferative activities on three cancer cell lines. The structure-activity relationship studies were conducted through the variation in the three regions of the thiazolo-pyrimidine core. Substitution with morpholine led to compound 24, which exerted the most potent antiproliferative activity as well as good selectivity between cancer and normal cells (IC values of 1.

Epitaxial Growth of Aligned and Continuous Carbon Nanofibers from Carbon Nanotubes.

Exploiting the superior properties of nanomaterials at macroscopic scale is a key issue of nanoscience. Different from the integration strategy, "additive synthesis" of macroscopic structures from nanomaterial templates may be a promising choice. In this paper, we report the epitaxial growth of aligned, continuous, and catalyst-free carbon nanofiber thin films from carbon nanotube films.

Design, synthesis and biological evaluation of [1,2,3]triazolo[4,5-d]pyrimidine derivatives possessing a hydrazone moiety as antiproliferative agents.

A series of [1,2,3]triazolo[4,5-d]pyrimidine derivatives bearing a hydrazone moiety were designed, synthesized and evaluated for their antiproliferative activity against several cancer cell lines of different origins by MTT assay. Most of the synthesized compounds demonstrated moderate to good activity against the cancer cell lines selected. Especially, compound 43 showed the most potent antiproliferative activity as well as good selectivity between cancer and normal cells (IC values of 0.

Observation of Charge Generation and Transfer during CVD Growth of Carbon Nanotubes.

Carbon nanotube (CNT) is believed to be the most promising material for next generation IC industries with the prerequisite of chirality specific growth. For various approaches to controlling the chiral indices of CNTs, the key is to deepen the understanding of the catalytic growth mechanism in chemical vapor deposition (CVD). Here we show our discovery that the as-grown CNTs are all negatively charged after Fe-catalyzed CVD process.

Ice-assisted transfer of carbon nanotube arrays.

Decoupling the growth and the application of nanomaterials by transfer is an important issue in nanotechnology. Here, we developed an efficient transfer technique for carbon nanotube (CNT) arrays by using ice as a binder to temporarily bond the CNT array and the target substrate. Ice makes it an ultraclean transfer because the evaporation of ice ensures that no contaminants are introduced.

Vapor-condensation-assisted optical microscopy for ultralong carbon nanotubes and other nanostructures.

Here we present a simple yet powerful approach for the imaging of nanostructures under an optical microscope with the help of vapor condensation on their surfaces. Supersaturated water vapor will first form a nanometer-sized water droplet on the condensation nuclei on the surface of nanostructures, and then the water droplet will grow bigger and scatter more light to make the outline of the nanostructure be visible under dark-field optical microscope. This vapor-condensation-assisted (VCA) optical microscopy is applicable to a variety of nanostructures from ultralong carbon nanotubes to functional groups, generating images with contrast coming from the difference in density of the condensation sites, and does not induce any impurities to the specimens.