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Abstract: Vertical-aligned Ag nanoflake arrays are fabricated on the surface of an anodic aluminum oxide (AAO) template under a hydrothermal condition for the first time. The porous surface of AAO templates and the precursor solution may play key roles in the process of fabricating Ag nanoflakes. The rim of pores can provide many active sites for nucleation and growth, and then nanoflake arrays gradually form through self-assembly of Ag on the surface of AAO membranes. The product is characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), and a growth mechanism of nanoflake is deduced. This work demonstrates that it is possible to make ordered nanoarrays without dissolving templates using the hydrothermal method, and this interesting Ag nanoflake arrays may provide a wider range of nanoscale applications. [Copyright &y& Elsevier]

Abstract: This paper describes a new approach to the synthesis of Ag nanorods. A solvothermal method was used to make Ag nanoparticles inside anodic aluminum oxide (AAO) templates. The nanoparticles were then annealed at 300°C to produce Ag nanorods. The size of AAO templates, which is focused on in this study, would determine the diameter of Ag nanorods. The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). In this study, a nanorod growth mechanism is deduced, and understanding of the growth of nanorods inside AAO templates is furthered. This work demonstrates that it is possible to make crystalline nanorods that the size can be varied. [Copyright &y& Elsevier]

In this research, a facile method to produce the core-shell MnO 2 @NH 4 MnF 3 nanorods of 50–80 nm in diameter from the manganese silicate particles was introduced. The α-MnO 2 and NH 4 MnF 3 samples were synthesized and their electrochemical performances were also measured for comparison. TEM and EDS results show the ∼6 nm NH 4 MnF 3 shell is well coated on the α-MnO 2 core. This novel nanocomposite has less Mn(II) and more Mn(IV) content, better conductivity, as well as moderate capacitive contribution. Besides, the specific capacitance of MnO 2 @NH 4 MnF 3 nanorods reaches 240 F g−1 and could retain 98.0% of initial after 1000 cycles galvanostatic charge/discharge. The asymmetric supercapacitor AC//MnO 2 @NH 4 MnF 3 with 1.7 V working potential range has been fabricated. It performs an energy density of 11.2 Wh kg−1 at the power density of 10 kW kg−1. [ABSTRACT FROM AUTHOR]