Because the size is too small to see individual copper particles, only a dense film is seen covering the silicon surface instead of agglomerated large-size copper particles
Because the size is too small to see a single copper particle, only a dense film is seen covered with a silicon surface, rather than the large copper particles that are reunited.
Because of the size is too small to see single copper particles, only a layer of dense film covered the silicon surface, rather than agglomerated large copper particles<BR>