It was no noble metal, only yellow mica!

This work demonstrates a bottom-up self-assembly approach for noble metal nanoparticle formation and the subsequent silicon wet etching.

The first worked is the north-eastern corner-infact, the Nile-valley and its adjacencies, where Fayzoghlú still supplies the noble metal.

A natural alloy of gold containing 20 per cent silver, termed electrum, is the lowest grade of the noble metal.

Recent studies have further demonstrated that the conjugation of noble metal helical nanostructures could alter their optical and catalytic activities.