科研之友
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摘要
Uniform multiply twinned particles (MTP) of nanosilver were synthesized in polyvinylpyrrolidone (PVP) and sodium dodecyl sulfate (SDS) aggregations soft template solution by using ammoniacal silver ions as reaction precursor and glucose as reducing agent. Subsequently, the MTP which were (50 +/- 5) nm in diameter spontaneously grew into silver nanorods. The surface plasma resonance peak of these silver MTP appeared at 441 nm and their XRD diffraction pattern revealed that they were face-centric structure (fcc) with the strongest diffraction peak at the (111) lattice plane. The lattice fringes and twin planes of the MTP were observed by the high-resolution transmission electron microscopy (HRTEM) and the quintuple twinned structure of the MTP was further validated by the selected area electron diffraction (SAED). It is deduced that the as-prepared MTP of nanosilver with high growth activities could further grow induced by the PVP-SDS template. Eventually, anisotropy silver nanorods were simply prepared in one-pot by virtue of the restricted Ostwald ripening assisted by PVP-SDS soft template at normal temperature. This is a novel route instead of the conventional polyol-assisted and crystal seed-induced hyperthernal methods, which could evidently increase the applicability of the wet-chemical methods and markedly reduce the cost to prepare one-dimensional nanosilver materials.
