laser generated metal nanoparticle colloids - from left to right:
gold, silvber, copper, titanium

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Comment by MAJID DARROUDI on June 22, 2010 at 8:45am
Dear Stephan,

Thank you for your nice answer


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Comment by Dr. Stephan Barcikowski on June 22, 2010 at 1:41am
Dear Majid,
as you correctly mentioned, all plasmon resonant materials show size-dependent colour, especially with sizes above 20 nm; clearly visible for sizes above 40 nm. In the case of Cu and Ti, it is more complicated, since oxide shell contributes to the colour (e.g., Ti in Acetone is gray, whereas blue in water).
Regards, Stephan

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Comment by MAJID DARROUDI on June 19, 2010 at 12:04am
Dear Stephan,

This difference between colours of Au, Ag, Cu, and Ti solutions is only depend to their size or nature of metals?
because some times one metal nanoparticles e.g. Au show different colour at different size.

Thank you,

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