Figure 7From: Conditionally activating optical contrast agent with enhanced sensitivity via gold nanoparticle plasmon energy transfer: feasibility study An issue in designing two-spacer NanoPPET. (A) Idealistic two spacer conjugation for Cypate-dual spacer–GNP complex and (B) the product likely formed during the Cypate and GNP reacting with two spacers: GNP cross-linking and precipitation.Back to article page