Construction of FeNi@graphite nanoparticles via corrosion-like transformation from NiFeO and surface graphitization in flexible carbon nanofibers to achieve strong wideband microwave absorption.

Recently, microwave absorption (MA) materials have attracted intensive research attention for their ability to counteract the effects of ever-growing electromagnetic pollution. However, conventional microwave absorbers suffer from complex fabrication processes, poor stability and different optimal thicknesses for minimum reflection loss (RL) and widest effective absorption bandwidth (EAB). To address these issues, we have used electrospinning followed by high-temperature annealing in argon to develop a flexible microwave absorber with strong wideband absorption.

Defect-induced deep red luminescence of CaGdAlO-type layered perovskites: multi-cationic sites partial/full substitution and application in pc-LED and plant lighting.

A series of CaGdAlO-type layered perovskite phosphors showing deep red luminescence ( = 711 nm, = 338 nm) were synthesized a solid-state reaction. A comprehensive analysis performed photoluminescence, X-ray photoelectron spectroscopy, thermoluminescence, and fluorescence decay revealed that the deep red luminescence is related to oxygen defects and particularly oxygen interstitials. The defect-related luminescence was effectively regulated through partial substitution of multi-cationic sites (the Ca site with Mg, Sr, and Ba; the Gd site with La, Y, and Lu) and full substitution of Gd with Y.

Non-Small Cell Lung Cancer Detection and Subtyping by UPLC-HRMS-Based Tissue Metabolomics.

Non-small cell lung cancer (NSCLC) is the prevalent histological subtype of lung cancer. In this study, we performed ultraperformance liquid chromatography-high-resolution mass spectrometry (UPLC-HRMS)-based metabolic profiling of 227 tissue samples from 79 lung cancer patients with adenocarcinoma (AC) or squamous cell carcinoma (SCC). Orthogonal partial least squares-discriminant analysis (oPLS-DA) analyses showed that AC, SCC, and NSCLC tumors were discriminated from adjacent noncancerous tissue (ANT) and distant noncancerous tissue (DNT) samples with good accuracies (91.

Lithium Diffusion in Silicon Encapsulated with Graphene.

The model of a graphene (Gr) sheet putting on a silicon (Si) substrate is used to simulate the structures of Si microparticles wrapped up in a graphene cage, which may be the anode of lithium-ion batteries (LIBS) to improve the high-volume expansion of Si anode materials. The common low-energy defective graphene (-Gr) structures of DV5-8-5, DV555-777 and SV are studied and compared with perfect graphene (-Gr). First-principles calculations are performed to confirm the stable structures before and after Li penetrating through the Gr sheet or graphene/Si-substrate (Gr/Si) slab.

Atomic Identification of Interfaces in Individual Core@shell Quantum Dots.

CdSe@CdS Core@shell quantum dots (QDs) have been widely studied in recent years, due to their architecture which allows to tailor properties by controlling structure and composition. However, since CdSe and CdS have the same crystal structure, same cations, and similar lattice parameters, it is very challenging to image the interface. Herein, high-resolution transmission electron microscopy, high-angle annular dark-field imaging, and energy-dispersive X-ray spectroscopy elemental mapping are combined to characterize the core@shell structure and identify the interface in the CdSe@CdS QDs with different CdS shell thicknesses.

Self-Assembly of CsPbBr Nanocubes into 2D Nanosheets.

All-inorganic metal halide perovskites have attracted considerable attention due to their high application potentials in optoelectronics, photonics, and energy conversion. Herein, two-dimensional (2D) CsPbBr nanosheets with a thickness of about 3 nm have been synthesized through a simple chemical process based on a hot-injection technique. The lateral dimension of CsPbBr nanosheets ranges from 11 to 110 nm, which can be tuned by adjusting the ratio of short ligands (octanoic acid and octylamine) over long ligands (oleic acid and oleylamine).

Novel superconducting structures of BH under high pressure.

The crystal structures of boron hydrides in a pressure range of 50-400 GPa were studied using the genetic algorithm (GA) method combined with first-principles density functional theory calculations. BH4 and BH5 are predicted to be thermodynamically unstable. Two new BH2 structures with Cmcm and C2/c space group symmetries, respectively, were predicted, in which the B atoms tend to form two-dimensional sheets.

Electroic and optical properties of germanene/MoS heterobilayers: first principles study.

First principles calculations have been performed to investigate the structural, electronic, and optical properties of germanene/MoS heterostructures. The results show that a weak van der Waals coupling between germanene and MoS layers can lead to a considerable band-gap opening (53 meV) as well as the preserved Dirac cone with a linear band dispersion of germanene. The applied external electric filed can not only enhance the interaction strength between two layers, but also linearly control the charge transfer between germanene and MoS layers, and consequently lead to a tunable band gap.

Micro-nanostructured δ-BiO with surface oxygen vacancies as superior adsorbents for SeO ions.

Removal of the toxic selenium compounds, selenite (SeO) and selenate (SeO), from contaminated water is imperative for environmental protection in both developing and industrialized countries. Providing high selectivity adsorbents to the target ions is a big challenge. Here we report that micro sphere-like δ-BiO (MS-δ-BiO) with surface oxygen vacancy defects can capture hypertoxic SeO anions from aqueous solutions with superior capacity and fast uptake rate.

In Situ Ligand Modification Strategy for the Construction of One-, Two-, and Three-Dimensional Heterometallic Iodides.

Three heterometallic iodides featuring the novel in situ modified ligands N,N',N″-trimethyl-2,4,6-tris(4-pyridyl)-1,3,5-triazine (Metpt), N,N'-dimethyl-2,4,6-tris(4-pyridyl)-1,3,5-triazine (Metpt), and N-monomethyl-2,4,6-tris(4-pyridyl)-1,3,5-triazine (Metpt), [PbCuI(Metpt)] (1), [PbCuI(Metpt)] (2), and [PbCuI(Metpt)] (3), were synthesized. Compound 1 exhibits a chain structure, in which the PbI units are connected by the CuI units. The negative charge of the resulting chain is balanced by the cationic Metpt groups.

Tuning and understanding the phase interface of TiO₂ nanoparticles for more efficient lithium ion storage.

We demonstrate that mixed-phase anatase-TiO2(B) nanoparticles can provide an interesting interphase interface with atomic-level contact for achieving more efficient Li ion storage with high capacity and cycle life. A novel lithium storage mode - "interfacial charge storage in allomorphs" (ICSA) - plays an important role in enhancing Li ion storage.

Structures and electronic properties of the SiAu(n) (n = 17-20) clusters.

The structures and electronic properties of the SiAu(n) (n = 17-20) clusters are systematically investigated using DFT calculations. The result shows that doping with silicon would significantly change the structures of the gold clusters. For the SiAu(n) (n = 17-20) clusters, the lowest-energy structures exhibit shell-like cage configuration in which the dopant Si atom binds to the cage surface and one Au atom skips to the top of the Si atom forming a SiAu5 or SiAu6 subunit except SiAu19, which is a tetrahedron-like structure with a protruding Au atom.