Huaqing Yu

The ZrSnO ₂ alloys may achieve a full-component solid solution above the critical temperature of 979 K. The Zr doping strategy is expected to realize the bandgap regulation of SnO ₂ from visible light-blind UV-B band to solar-blind deep UV band.

The micro-channel heat sink (MCHS) is an excellent choice due to its exceptional cooling capabilities, surpassing those of its competitors. In this research paper, a computational fluid dynamics analysis was performed to investigate the laminar flow and heat transfer characteristics of five different configurations of a variable geometry rectangular fin. The study utilized a water-cooled smooth MCHS as the basis. The results indicate that the micro-channel heat sink with a variable geometry rectangular fin has better heat dissipation capacity than a straight-type micro-channel heat sink, but at the same time, it has larger pressure loss. Based on the analysis of various rectangular fin shapes and Reynolds numbers in this study, the micro-channel heat sink with rectangular fins exhibits Nusselt numbers and friction factors that are 1.40–2.02 and 2.64–4.33 times higher, respectively, compared to the smooth heat sink. This significant improvement in performance results in performance evaluation criteria ranging from 1.23–1.95. Further, it is found that at a relatively small Reynolds number, the micro-channel heat sink with a variable geometry rectangular fin has obvious advantages in terms of overall cooling performance. Meanwhile, this advantage will decrease when the Reynolds number is relatively large.

A heterogeneous trilayer CsPbI₃/PbS/ZnO architecture was constructed to promote the efficient space separation of carriers for flexible wide spectrum photodetection.

为了减小器件尺寸、实现超快速响应和动态可调谐, 研究了基于石墨烯纳米条波导边耦合矩形腔的单波段和双波段的等离子体诱导透明(PIT)效应, 通过耦合模式理论和时域有限差分法从数值计算和模拟仿真两方面分析了模型的慢光特性. 通过调节石墨烯矩形腔的化学势, 同时实现了单波段、双波段PIT模型的谐振波长和透射峰值的可调谐性. 当石墨烯的化学势增加时, 各个波段PIT窗口的谐振波长逐渐减小, 发生蓝移. 此外, 通过动态调谐石墨烯矩形腔的谐振波长, 当石墨烯矩形腔的化学势为0.41—0.44 eV时, 单PIT系统的群折射率控制在79.2—28.3之间, 可调谐带宽为477 nm; 当石墨烯矩形腔1, 2, 3的化学势分别为0.39—0.42 eV, 0.40—0.43 eV, 0.41—0.44 eV时, 双PIT系统的群折射率控制在143.2—108.6之间. 并且, 整个系统的尺寸小于0.5 μm². 研究结果对于超快速、超紧凑型和动态可调谐的光传感、光滤波、慢光和光存储器件的设计和制作具有一定的参考意义.

The rich physical properties of metal-intercalated polycyclic aromatic hydrocarbon materials have recently attracted considerable attention. Crystals of potassium-intercalated 2,7-dimethylnaphthalene were synthesized via solid phase reaction. The combination of XRD measurements and first-principles calculations indicated that each unit cell contains two potassium atoms and four organic molecules. Magnetization measurements revealed that the samples show a Curie paramagnetism. Theoretical calculations showed that the intercalated structure becomes metallic and has local magnetic moment. Raman spectroscopy confirmed the migration of electron from potassium 4s to carbon 2p orbital, which is the source of magnetism. Our research on naphthalene derivatives is helpful for expanding the range of novel organic magnetic materials and organic superconducting materials.

In metal-semiconductor hybrid nanostructures, metal absorbs incident photons and generates hot carriers. The hot carriers are injected into the adjacent semiconductor and subsequently contribute to photocurrent. This process increases the conversion efficiency of optoelectronic devices and provides a new path of photodetectors. In this work, we report an enhanced photodetector by hot holes transfer, which is based on Au nanoparticles decorated p-type Cu ₂ O nanowires. The photodetector achieves an enhanced photo-responsivity up to 0.314 A W ⁻¹ , a higher detectivity of 3.7 × 10 ¹⁰ Jones. The response time and external quantum efficiency of the Cu ₂ O–Au nanowires photodetector are 3.7 times faster and 18.2 times higher than that of the Cu ₂ O nanowires, respectively. The findings indicate that Cu ₂ O–Au nanowires would be a promising candidate in developing novel plasmonic hot carrier devices.

Size-controlled synthesis and size-dependent antibacterial activity of Cu₂O nanoparticles with high efficiency for H₂O₂ evolution.