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Abstract: NiO-doped p-type AZO (Al/Zn=1.5at.%) films were synthesized on glass substrates using a simple and low cost sol–gel solution method. p-type conductivity could be achieved by annealing the NiO:AZO films in N2/H2 forming gas at 550°C. The real Al/Zn and Ni/Zn ratio, hole concentration, hole mobility and resistivity of the 1.5–2mol% NiO-doped AZO films were 0.26–0.29, 0.06–0.09, 3.15×1018–2.18×1020 cm−3, 2.33–12.76cm2/Vs, and 2.39×10−1–1.24×10−2 Ωcm, respectively. I–V measurements of the p–n junction (ITO/NiO:AZO) revealed rectifying I–V characteristics, confirming that these NiO:AZO films exhibit p-type conductivity. This study opens the possibility of developing highly conductive p-type composite transparent conducting oxides for optoelectronic devices. [Copyright &y& Elsevier]

Abstract: A proof-of-concept of applying laser micro-machining to fabricate high performance GaN light-emitting diode (LED) was presented in this study. Laser micro-machining was applied to fabricate GaN LED chip with angled sidewalls (ALED). The inclined sapphire sidewalls were coated with highly reflective silver film which functions as an efficient light out-coupling medium for photons within the LED structure. Thus, more laterally-propagating photons can be redirected to the upward direction of the ALED with silver coating (Ag-ALED). Performances of the Ag-ALED, ALED and conventional planar GaN LED were evaluated. At an injection current of 30mA, the light output intensity of Ag-ALED was significantly improved by 97% and 195% as compared to ALED and conventional planar LED, respectively. The corresponding wall-plug efficiency of Ag-ALED was remarkably increased by 95% and 193% as compared to ALED and conventional planar LED, respectively. The results of this study demonstrated that the Ag-ALED showed a pronounced increase in light output intensity compared to conventional planar LED, which may have many potential applications in the field of display engineering. [Copyright &y& Elsevier]

Highlights: [•] A single mat having varieties of performance for water treatment is simply introduced. [•] Cost effective Ag-doped fly ash/PU nanofibers are fabricated in one-step. [•] Solvent reduction of AgNO3 could produce Ag-loaded spider-web nets. [•] Size of Ag NPs on fiber surface can be controlled by controlling stirring time. [•] Fabrication of nanocomposite using pollutant material to control other pollutents. [Copyright &y& Elsevier]

Highlights: [•] We designed a new metal dry bioelectrode with novel construction. [•] Laser micromachining was used to fabricate dry bioelectrode with microstructure array. [•] The impedance values of electrode-skin were recorded using the two-electrode method. [•] Smaller variations and better stability of dry bioelectrode were observed. [Copyright &y& Elsevier]

Abstract: A novel porous metal fiber sintered sheet (PMFSS) with high porosity was fabricated by the solid-state sintering method of copper fibers. In this study, the shear experiments were conducted to investigate the effect of porosity and sintering parameter on the shear properties of PMFSS. The typical shear stress–strain plot of PMFSS was obtained based on a larger number of shear test results. The shear fracture process of PMFSS was then divided into three steps: linear elastic stage, plastic deformation stage, and shear fracture stage. The shear strength was found to be decreased with increasing porosity ranging from 70% to 90% when the PMFSS was produced under the same sintering parameter. Moreover, the influence of sintering parameter on shear strength of PMFSS was also investigated. Our experimental results showed that the increase of the sintering temperature or holding time would give rise to the increase of shear strength of PMFSS. [Copyright &y& Elsevier]

Abstract: A novel porous metal fiber sintered sheet (PMFSS) with three-dimensional reticulated structure was fabricated by using solid-state sintering method of copper fibers. Uniaxial compressive test was carried out to investigate the effects of porosity and manufacturing parameters on the compressive properties of PMFSS. During the compressive process, it was found that the PMFSS initially exhibited short-term elastic deformation, and then quickly entered into the compact densification deformation stage. The stress–strain plots showed no obvious yield stage in the whole uniaxial compressive process. Under given stress, the PMFSS with higher porosity exhibited higher strain, hence implying lower effective stiffness. Additionally, our results showed that higher sintering temperature or longer sintering time would soften the PMFSS. [Copyright &y& Elsevier]