Abstract
A simple approach for the large-scale synthesis of cotton-like nanogoldby a liquid-based process at room temperature is described. The goldfibres have diameters in the range of 15–40 nm and lengths longer than50 µm, entwined into a complex mass. The first step of the preparationprocedure involves the formation of gold seeds by reducingHAuCl4 with NaBH4 in a solution containing the desired quantity of cetyltrimetylammonium bromide (CTAB). In thesubsequent step, the gold seeds continuously grow to form cotton-like nanogold in a solution containingHAuCl4, CTAB and L-ascorbic acid (AA) under an ultrasonic radiation field. The cotton-likenanogold has observable fluorescence, which might have great significance in biological andmedical applications. HRTEM images showed that many defects and twin crystals exist inthe turning junctions of as-prepared cotton fibres, which might be the reason the turningjunctions in the fibres became stable.
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