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Formation of cotton-like nanogold assembly and their fluorescence property

机译：棉状纳米金组装体的形成及其荧光性质

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A simple approach for the large-scale synthesis of cotton-like nanogold by a liquid-based process at room temperature is described. The gold fibres have diameters in the range of 15-40 nm and lengths longer than 50 mu m, entwined into a complex mass. The first step of the preparation procedure involves the formation of gold seeds by reducing HauCl_4 with NaBH_4 in a solution containing the desired quantity of cetyltrimetylammonium bromide (CTAB). In the subsequent step, the gold seeds continuously grow to form cotton-like nanogold in a solution containing HauCl_4, CTAB and L-ascorbic acid (AA) under an ultrasonic radiation field. The cotton-like nanogold has observable fluorescence, which might have great significance in biological and medical applications. HRTEM images showed that many defects and twin crystals exist in the turning junctions of as-prepared cotton fibres, which might be the reason the turning junctions in the fibres became stable.
机译：描述了在室温下通过基于液体的方法大规模合成棉状纳米金的简单方法。金纤维的直径为15-40nm，长度大于50μm，缠绕成复杂的团块。制备过程的第一步涉及通过在含有所需量的十六烷基三甲基溴化铵（CTAB）的溶液中用NaBH_4还原HauCl_4来形成金种子。在随后的步骤中，金种子在超声辐射场下在含有HauCl_4，CTAB和L-抗坏血酸（AA）的溶液中连续生长以形成棉状纳米金。棉状纳米金具有可观察到的荧光，这在生物学和医学应用中可能具有重要意义。 HRTEM图像显示，在制备的棉纤维的转向结中存在许多缺陷和双晶，这可能是纤维中转向结变得稳定的原因。

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