Fig. 1. Schematic diagram of aggregation-induced in situ photoactivated fingerprint imaging using a microgrid atomization technique

Fig. 2. Imaging effects of aggregation-induced in situ photoactivation using different visualization methods and their corresponding gray value distributions. (a1) Ink fingerprint sample and (a2) corresponding gray value distribution; (b1) fingerprint obtained by the dipping and coating method and (b2) corresponding gray value distribution; (c1) fingerprint obtained by the drop-casting method and (c2) corresponding gray value distribution; (d1) fingerprint obtained by the cotton pad dipping method and (d2) corresponding gray value distribution; (e1) fingerprints obtained by the soaking method and (e2) corresponding gray value distribution; (f1) fingerprint obtained by the microgrid atomization method and (f2) corresponding gray value distribution

Fig. 3. Imaging effects of aggregation-induced in situ photoactivation for consecutive prints and corresponding gray value distributions. (a) Ink fingerprint sample and fingerprints obtained by the microgrid atomization method; (b) distribution of gray value

Fig. 4. Imaging effects of aggregation-induced in situ photoactivation for 125‒200 times consecutive prints

Fig. 5. Imaging effects of aggregation-induced in situ photoactivation using different background colors of objects and corresponding gray value distributions. (a1)‒(a6) Imaging effects in car paint surfaces; (a7)‒(a12) imaging effects in cardboard surfaces; (b1)‒(b6) distribution of gray value for car paint surfaces imaging; (b7)‒(b12) distribution of gray values for cardboard surfaces imaging

Fig. 6. Imaging effects of aggregation-induced in situ photoactivation by different pre-processing methods and corresponding gray value distributions. (a1) black cardboard processed by the microgrid atomization method; (a2) black cardboard processed by the soaking method; (b1) red cardboard processed by the microgrid atomization method; (b2) red cardboard processed by the soaking method

Fig. 7. Variation in the average number of secondary feature points after AIE in situ photoactivated with fingerprint impression times