Template synthesis and structural characteristics of metal nanowires in organic-inorganic hybrid mesoporous material

摘要

Precise control of size and shape of nanostructured material has been an attractive goal in materials science and catalysis. In particular, metal nanowires have attracted much attention in the field of nanotechnology due to their potential magnetic, optical, electrical, and catalytic properties based on their low-dimensionality. In the present work, we report template synthesis, characterization, and applications of transition metal nanowires in organic-inorganic hybrid HMM-1. Pt, Rh Pt-Rh, and Pt-Pd nanowires (3 nm x 10-300 nm) are synthesized in HMM-1 by the photoreduction of impregnated metal chlorides. In the TEM images, the nanowires in HMM-1 are observed as an array of nanoparticles connected like a nanonecklace in the one-dimensional channel of HMM-1. The HRTEM and EDX studies suggest that the bimetallic nanowires are alloy crystallites. The Pt-Pd wire/HMM-1 shows higher magnetic susceptibility at low temperature than the Pt wire/HMM-1. The metal nanowires were extracted by dissolving HMM-1 with diluted hydrofluoric acid.