Direct deposition of Sn-doped CsPbBr perovskite for efficient solar cell application.

All inorganic carbon-based planar perovskites, particularly CsPbBr, have attracted considerable attention due to their excellent stability against oxygen, moisture, and heat for photovoltaic utilization. However, the power conversion efficiency of carbon-based planar CsPbBr perovskite solar cells is mostly low, primarily because of the inferior film quality with undesirable crystallization and narrow light absorbance ranges. Herein, we develop a novel direct deposition approach combined with Sn doping to achieve highly efficient and stable carbon-based Sn-doped CsPbBr perovskite solar cells.

Synthesis of SrTiO submicron cubes with simultaneous and competitive photocatalytic activity for HO splitting and CO reduction.

Single crystalline strontium titanate (SrTiO) submicron cubes have been synthesized based on a molten salt method. The submicron cubes showed superior photocatalytic activity towards both water splitting and carbon dioxide reduction, in which methane (CH) and hydrogen (H) were simultaneously produced. The average production rate of methane up to 8 h is 4.

[Research progress on chemical structures and pharmacological activities of Poria cocos polysaccharide and its derivatives].

Poria cocos is a both medicinal and edible Chinese herb variety, with the effects of diuretic, spleen-enhancing and tranquilizing. P. cocos polysaccharide(PCP) is one of the most important active substances of P.

The predictive value of serum amyloid A and C-reactive protein levels for the severity of coronavirus disease 2019.

This study was designed to assess the levels of human serum amyloid A (SAA) and C-reactive protein (CRP) in patients with coronavirus disease 2019 (COVID-19) to determine their prognostic value in predicting the severity of disease. Patients with COVID-19 who presented with acute respiratory distress syndrome (ARDS) shared distinct characteristics. For example, the patients were older, and had higher levels of inflammatory indicators [i.

First-principles study of two dimensional CN and its derivatives.

Here we have performed a comprehensive first-principles study for electronic and mechanical properties of newly synthesized CN and its derivatives. The CN monolayer is evaluated to be an indirect semiconductor with a HSE06 level bandgap of 1.09 eV, which can be effectively tuned by the number of layers, stacking order and B-doping concentration.

Facile synthesis of N, P-doped carbon dots from maize starch a solvothermal approach for the highly sensitive detection of Fe.

Nitrogen/phosphorus-doped carbon dots (N, P-CDs) with a quantum yield as high as 76.5% were synthesized by carbonizing maize starch a facile ethanol solvothermal approach. Transmission electron microscopy (TEM) measurement shows that the as-prepared N, P-CDs displayed a quasi-spherical shape with a mean size of 2.

[Study on chemical constituents of Dendrobium huoshanense stems and their anti-inflammatory activity].

Three bibenzyls 1-3 and six other compounds 4-9 were firstly isolated from Dendrobium huoshanense stems. They were identified as 3',4-dihydroxy-3,5'-dimethoxybibenzyl(1), batatasin Ⅲ(2), 3,4'-dihydroxy-5-methoxy bibenzyl(3), dihydroconiferyl dihydro-p-coumarate(4), syringaresinol(5), 3-(4-hydroxyphenyl)-propionic acid ethyl ester(6),(3-ethylphenyl)-1,2-ethanediol(7),(S)-5-hydroxy-3,4-dimethyl-5-pentylfuran-2(5H)-one(8) and loliolide(9). Anti-inflammation assay showed that bibenzyls 1-3 could significantly inhibit the production of nitric oxide(NO) and the expression of tumor necrosis factor α(TNF-α) and interleukin 1β(IL-1β) mRNA in LPS-induced RAW264.

Effect of salt mixture on flavor of reduced-sodium restructured bacon with ultrasound treatment.

Flavor loss from sodium reduction is a large challenge faced in the meat industry. The effects of salt mixture (KCl: CaCl = 1:1, w/w) content (0%-1.0%) on flavor of reduced-sodium (1.

Cu-Cd-Zn-S/ZnS core/shell quantum dot/polyvinyl alcohol flexible films for white light-emitting diodes.

We present a facile route for the synthesis of water-soluble Cu-Cd-Zn-S/ZnS core/shell quantum dots (QDs) by simple pH regulation. The PL spectra of Cu-Cd-Zn-S/ZnS core/shell quantum dots can cover the whole visible light region in the case of only two ratios of Cu/Cd/Zn. The emission wavelength of Cu-Cd-Zn-S/ZnS QDs can be conveniently tuned from 474 to 515 and 548 to 629 nm by adjusting the pH value when the ratios of Cu/Cd/Zn are fixed at 1 : 5 : 80 and 1 : 5 : 10, respectively.

Flexible translucent chitosan-glycerin/QD nanocomposite glue for anti-counterfeiting films with strong adhesion and stability.

With the rapid development of commodity circulation, more attention has been paid to the anticounterfeiting technology of commodities, including stability, universality and ease of distinguishing. The authors report the use of gelatin-chitosan-glycerin/QD nanocomposite-functionalized glue for luminescent anti-counterfeiting labels. As the blend and plasticizer, the addition of chitosan and glycerin effectively improved the flexibility and formability of the gelatin-chitosan-glycerin/QD composite films, which show excellent mechanical properties, including high transparency, luminescence and flexibility, and they are easy to prepare on a large scale, providing certain reference values for new anticounterfeiting technology applying a variety of morphologies.

Metal-free carbon monoxide-releasing micelles undergo tandem photochemical reactions for cutaneous wound healing.

Carbon monoxide (CO) has shown broad biomedical applications. The site-specific delivery and controlled release of CO is of crucial importance to achieve maximum therapeutic benefits. The development of carbon monoxide (CO)-releasing polymers (CORPs) can increase the stability, optimize pharmacokinetic behavior, and reduce the side effects of small molecule precursors.

Carbon electrode engineering for high efficiency all-inorganic perovskite solar cells.

Carbon-based inorganic perovskite solar cells (PSCs) have demonstrated an excellent performance in the field of photovoltaics owing to their simple fabrication techniques, low-cost and superior stability. Despite the lower efficiency of devices with a carbon electrode compared with the conventional structure, the potential applications in large scale have attracted increasing attention. Herein, we employ a mixed carbon electrode inorganic PSC by incorporating one-dimensional structure carbon nanotubes (CNTs) and two-dimensional TiC-MXene nanosheets into a commercial carbon paste.

Synthesis of lutein esters using a novel biocatalyst of lipase B covalently immobilized on functionalized graphitic carbon nitride nanosheets.

Lutein scavenges free radicals and inhibits vision damage caused by photo oxidation, while decomposing easily with light and heat. Its stability and bioavailability can be tremendously improved by lutein ester synthesis. However, green and efficient esterification preparation methods are urgently needed.

Effect of activation ratio on the characteristics of AC derived from anaerobic digester residue and its applications in supercapacitors.

Anaerobic digestion biogas residue contains a large amount of lignocellulose, and is a potential valuable biomass source. In the current study, activated carbon (AC) for supercapacitor electrodes was prepared with the anaerobic digestion residue collected from an anaerobic digester, with cow dung as the feedstock. The effects of activation ratio on the specific surface area, pore size distribution and electrochemical performance of AC were investigated.

Spray coated perylenebisimide/polymer film with controllable molecular aggregation state and emission properties.

Dye doped organic thin films with controllable molecular aggregation and emission properties are of broad interest to the scientific community owing to their large number of potential applications in physics, chemistry, and materials science. Here, a spray coating method was used to prepare perylenebisimides (PBI) doped polymer films. In this study, the effects of the dye concentration, polymer matrix, solvent, and casting process on the optical properties of the resulting films were studied.

Effect of Cu on the nucleation kinetics and crystallization of rod-shaped CaSO·2HO in aqueous solution.

In this study, a simple and efficient strategy is developed to synthesize rod-like CaSO·2HO (DH) crystals with tunable aspect ratio in aqueous solution using Cu as modifier. The aspect ratio and length of the DH crystals are effectively reduced to 5.7 : 1 and about 35 μm in the presence of Cu, respectively.

Multilayered PdSe/Perovskite Schottky Junction for Fast, Self-Powered, Polarization-Sensitive, Broadband Photodetectors, and Image Sensor Application.

Group-10 transition metal dichalcogenides (TMDs) with distinct optical and tunable electrical properties have exhibited great potential for various optoelectronic applications. Herein, a self-powered photodetector is developed with broadband response ranging from deep ultraviolet to near-infrared by combining FA Cs PbI perovskite with PdSe layer, a newly discovered TMDs material. Optoelectronic characterization reveals that the as-assembled PdSe/perovskite Schottky junction is sensitive to light illumination ranging from 200 to 1550 nm, with the highest sensitivity centered at ≈800 nm.

Reduced Local Symmetry in Lithium Compound LiSrSiO Distinguished by an Eu Spectroscopy Probe.

Research on lithium compounds has attracted much attention nowadays. However, to elucidate the precise structure of lithium compounds is a challenge, especially when considering the small ions that may be transferred between the interstitial voids. Here, the discovery of reduced local symmetry (symmetry breaking) in small domains of LiSrSiO is reported by employing Eu as a spectroscopic probe, for which X-ray, neutron, and electron diffraction have confirmed the average long-range structure with the space group 321.

High-sulfur coal-derived nitrogen, sulfur dual-doped carbon as an economical metal-free electrocatalyst for oxygen reduction reaction.

The search for an economical electrocatalyst for oxygen reduction reaction (ORR) is a worldwide issue for fuel cells and metal-air batteries. Herein, we used cheap and available high-sulfur inferior coal as the single precursor to synthesize an N, S dual-doped carbon (NSC) metal-free electrocatalyst for the ORR. The N, S dual-doped carbon (NSC), prepared at 800 °C (NSC800), possessed a large specific surface area of 942 m g, with an amorphous carbon structure and more defects than the others.

Graphene Oxide: From Tunable Structures to Diverse Luminescence Behaviors.

Since the first discovery of luminescent graphene oxide (GO), exponentially increasing investigations on the tunable structures and surfaces for modulating its optical properties have struggled to expand applications in imaging, sensing, biomedical diagnostics, and so on. Here, the latest works on reconstructing or modifying the structures and surfaces of GO to achieve diverse luminescence are systematically reviewed, including fluorescence, electroluminescence, and chemiluminescence. Moreover, the fundamental difficulties of the investigations and applications of luminescent GO nanomaterials are clarified to inspire more constructive thoughts for expanding their application boundaries.

[Therapeutic effect and mechanism of three kinds of Dendrobium on constipation in rats with spleen Yin deficiency].

Books on Chinese herbal medicines have shown that Dendrobium has the effect of nourishing Yin and reinforcing Yin,usually used for constipation induced by spleen Yin deficiency in clinical application. D. huoshanense,as an independent species among many species of Dendrobium,has no experimental studies about its effects on spleen Yin deficiency-type constipation.

Preparation of monoethyl fumarate-based molecularly imprinted polymers and their application as a solid-phase extraction sorbent for the separation of scopolamine from tropane alkaloids.

Molecularly imprinted polymers (MIPs) prepared using conventional functional monomers exhibit poor specific extraction of scopolamine from tropane alkaloids, which hinders their application in separation and purification. In this paper, a novel molecularly imprinted polymer (MIP) was prepared by precipitation polymerization using scopolamine as the template, monoethyl fumarate (MFMA) as a functional monomer, and ethylene dimethacrylate (EGDMA) as a cross-linker. The advantages of the supercritical fluid technology for the removal of the template were verified by comparing the efficiency of the swelling method and the Soxhlet extraction method.

A new methodology for sensory quality assessment of garlic based on metabolomics and an artificial neural network.

This study has established a new method for the sensory quality determination of garlic and garlic products on the basis of metabolomics and an artificial neural network. A total of 89 quality indicators were obtained, mainly through the metabolomics analysis using gas chromatography/mass spectrometry (GC/MS) and high performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS). The quality indicator data were standardized and fused at a low level, and then seven representative indicators including the a* (redness) value, and the contents of -methyl-l-cysteine, 3-vinyl-1,2-dithiacyclohex-5-ene, glutamic acid, l-tyrosine, d-fructose and propene were screened by partial least squares discriminant analysis (PLS-DA), analysis of variance (ANOVA) and correlation analysis (CA).

An amorphous MoS modified g-CN composite for efficient photocatalytic hydrogen evolution under visible light.

In this work, an MoS /g-CN composite photocatalyst was successfully fabricated by a sonochemical approach, where amorphous MoS was synthesized using a hydrothermal method with NaMoO·HO, HSiO(WO) and CHCSNH as precursors, and g-CN nanosheets were produced using a two-step thermal polycondensation method. The hydrogen-evolution performance of the MoS /g-CN composite was tested under visible light. The results show that the H-evolution rate of the MoS /g-CN (7 wt%) photocatalyst reaches a maximum value of 1586 μmol g h, which is about 70 times that of pure g-CN nanosheets.

Nitrogen, sulfur-codoped micro-mesoporous carbon derived from boat-fruited sterculia seed for robust lithium-sulfur batteries.

The diverse textures and tunable surface properties of abundant bioresources offer great opportunities to utilize biochar materials as sulfur hosts for naturally boosting the electrochemical performances of Li-S batteries. Herein, a N, S-codoped micro-mesoporous carbon was synthesized from boat-fruited sterculia seed, and used as a sulfur host matrix for Li-S batteries. After sulfur infiltration (≈62% sulfur) and cell assembly, the obtained S/NSBC cathode shows outstanding discharge-charge performance, good rate capability, and especially long cycling stability.