Hollow and nanoporous Ag sub-microcubes as SERS substrates

Fabricating Ag(NH 3 ) 2 NO 3 microcubes by directly evaporating silver ammonia solution. In Na 3 Cit solution, Ag(NH 3 ) 2 NO 3 microcubes were converted into Ag 3 Cit sub-microcubes, which could be reduced to Ag sub-microcages with excellent SERS performances.