We present the full thermoelectric characterization of nanostructured bulk PbTe and PbTe-PbSe samples fabricated from colloidal core-shell nanoparticles followed by spark plasma sintering. An unusually large thermopower is found in both materials, and the possibility of energy filtering as opposed to grain boundary scattering as an explanation is discussed. A decreased Debye temperature and an ...

In the title mol-ecule, C(22)H(23)O(4)PSe, the P atom has a distorted tetra-hedral environment formed by the selenide atom [P=Se = 2.1219 (5) Å] and three aryl rings. The orientations of the meth-oxy groups in the two 2,4-dimeth-oxy-phenyl ligands are distinct, as seen from the torsion angles: C-C-O-C = 14.7 (3) and 175.97 (17)° in one ligand, and -9.1 (2) and 5.1 (3)° in the other. In the crys...

In the title mol-ecule, C(26)H(22)P(2)Se(2), both P atoms have distorted tetra-hedral environments, resulting in effective cone angles of 177 and 174°. Inversion twinning was detected and refined to a ratio of 0.35:0.65. Weak inter-molecular C-H⋯Se inter-actions are observed.

In the title mol-ecule, C(20)H(32)NPSe, the P atom has a distorted tetra-hedral environment resulting in an effective cone angle of 172°. Weak inter-molecular C-H⋯Se inter-actions are observed.

PbSe/CdSe core/shell nanocrystals with quantum yield of 70% were obtained by the "successive ion layer adsorption and reaction" technology in solution. The thickness of the CdSe shell was exactly controlled. A series of spectral red shifts with the CdSe shell growth were observed, which was attributed to the combined effect of the surface polarization and the expansion of carriers' wavefunction...

2D layered materials have recently attracted tremendous interest due to their fascinating properties and potential applications. The interlayer interactions are much weaker than the intralayer bonds, allowing the as-synthesized materials to exhibit different stacking sequences, leading to different physical properties. Here, we show that regardless of the space group of the 2D materials, the Ra...

Low-energy collective electronic excitations exhibiting sound-like linear dispersion have been intensively studied both experimentally and theoretically for a long time. However, coherent acoustic plasmon modes appearing in time-domain measurements are rarely observed due to Landau damping by the single-particle continua. Here we report on the observation of coherent acoustic Dirac plasmon (CAD...

Topological phase transition is accompanied with a change of topological numbers. According to the bulk-edge correspondence, the gap closing and the breakdown of the adiabaticity are necessary at the phase transition point to make the topological number ill-defined. However, the gap closing is not always needed. In this paper, we show that two topological distinct phases can be continuously con...

Two phase reactions are the analogy of biomembranes, which polarized by Galvani potential difference at interface between two immiscible electrolyte solutions. Energy conversion such as oxygen reduction reaction or hydrogen evolution have been great drawn attention soft interfaces due to similarity natural biochemical reactions. In this study, copper-based ternary metal selenide (copper tungste...