All of these syntheses work best if you consider a seed mediated approach. In a first step, small crystallization seeds are formed by a rapid reduction process in the presence of a shape directing surfactant, which works best under application of sodium borohydride. In a second synthesis step the desired particle shape is grown in a slower reduction process, under conditions of slow metal deposition. The final shape depends on concentration ratios as well as on used chemicals.
I would like to suggest to read the review of Prof. Xia in Angewandte International ed.
DOI: 10.1002/anie.200802248
Since your question is quite complex. You will find some answers there and in the literature given therein.
As Andrea said, Xia and co-workers are reliable references and seed-mediated syntheses could be a versatile route. More specifically, to produce triangular nanoplates, it is a good starting point.
In addition Yin and co-workers also realized a great deal of work about metallic nanoparticles synthesis.
These works are more recent and may not appear in the review written by Xia :
DOI: 10.1002/cphc.201101018
DOI: 10.1021/ja2080345
More recently, gold microplates were synthesized by Supeera Nootchanat and al (DOI: 10.1039/c3ra22830d)
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