3. Results
3.1. Identification of the colloidal gold particles
The colloidal gold solution was deep red and had high light transmission. Fig. 2A shows the UV/Vis spectrum of the colloidal gold between 400 and 600 nm. A peak at about 529 nm resulted from surface resonance of the colloidal gold particles. A TEM image shows that the colloidal gold particles were almost of the same diameter, which provided the best basis for preparation of the ICS(Fig. 2B).