Abstract
Single-crystalline gold nanoplates with a thick- ness of less than 100 nm were synthesized by the reduction of HAuCl4 in water with cetyltrimethylammonium chloride, and their structures were confirmed by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction measurements. The formation and surface structures of octanethiol (OT) self-assembled monolayers (SAMs) on gold nanoplates were examined by means of atomic force microscopy and scanning tunnelling microscopy (STM). Molecularly resolved STM observation showed that OT SAMs on gold nanoplates at 25 °C for 24 h were composed of two mixed phases containing well-ordered (√3 × √3)R30° and c(4 × 2) domains and disordered domains, which are comparable to the formation of fully covered (√3 × √3)R30° or c(4 × 2) structures on conventional Au(111) films. After thermal annealing of the precovered OT SAMs on gold nanoplates at 70 °C for 30 min, we clearly observed the structural transitions of OT SAMs from the two mixed phases to the ...
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