Fig. 2.
Surface functionalization of nanoneedles and loading of cargo. (A) Surface functionalization of a CNT nanoneedle with streptavidin-conjugated quantum dots (QDs) through a linker molecule containing a disulfide bond. (B) Surface functionalization of a gold-coated nanoneedle with streptavidin-conjugated quantum dots (QDs) through a stepwise procedure. (A) reproduced with permission from Ref. [27] (Copyright 2007 National Academy of Sciences, U.S.A.), (B) from Ref. [30] (Copyright 2009 American Chemical Society).