Figure 19.

(a) Pristine and functionalized QDs. Surface functionalization occurs by the use of thiols bearing a benzene at the antipode. (b) Scheme of ON-OFF protocol utilized to improve the array performances. Three consecutive steps were performed consisting of NACs interaction, addition of a quencher (Q.A.) and finally addition of a masking agent (M.A.) to recover the signal of fluorescence. (c) PLS-DA projection using nine channels (three sensing QDS × three measurement steps). (d) Classification performances after NACs addition (three channels), NACs + Q.A. (six channels), and NACs + Q.A. + M.A. (nine channels). The histograms report both Jackknifed classification accuracy and unknown detection accuracy. Image is rearranged from Figures 1, 5 and 6 of [109].