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. 2015 Jan 1;5(1):62–70. doi: 10.7150/thno.10145

Figure 2.

Figure 2

Interrogation of the interaction between ssDNA-AuNPs and GO. (a) The absorbance of ssDNA-AuNPs (NP1) mixed with GO in Tris-HCl buffer for 1 h, and the spectra are recorded at time intervals of 5 min from 0 to 60 min (from top to bottom). (b) Absorbance titration of NP1-NP6 with GO. (c) Corresponding color change of NP1-NP6 after incubation with GO. (d) The proof of reversibility of the interaction between ssDNA-AuNPs and GO resulted from dominated non-covalent binding force. Once introduction of GO, the flocculent precipitate can gradually form during 1 h, however, the formed precipitate is also easily re-dispersed with mechanical agitation.