Fig. 3
From: Nanomaterial enabled sensors for environmental contaminants
![Fig. 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12951-018-0419-1/MediaObjects/12951_2018_419_Fig3_HTML.png)
(Reprinted with permission from Weerathunge et al. [95]. Copyright 2014 American Chemical Society)
Schematic representation of acetamiprid detection. Schematic representation of the reversible inhibition of the nanozyme activity of GNPs using an acetamiprid-specific S-18 ssDNA aptamer. Step A shows intrinsic peroxidase-like activity of GNPs that gets inhibited after shielding of the GNP surface through conjugation of S-18 aptamer molecules (step B). In the presence of acetamiprid target, the aptamer undergoes target-responsive structural changes and forms a supramolecular complex with acetamiprid resulting in free GNP to resume its peroxidase like activity (step C)