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Figures of the Article
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(a) Transmission electron microscopy (TEM) image, (b) mapping image, (c) XRD pattern and (d) fluorescence spectra of NaGdF4:Yb,Er-Fe3O4.
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Magnetic characterizations. (a–c) The hysteresis loop of (a) Fe3O4, (b) NaGdF4:Yb,Er-Fe3O4 (t=18 h) and (c) NaGdF4:Yb,Er-Fe3O4 (N∶F=4∶1). (d) Photograph of the NaGdF4:Yb,Er-Fe3O4 (N∶F=4∶1) sample attracted by the magnet.
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Detailed characteristic images of fingerprints developed by NaGdF4:Yb,Er-Fe3O4 nanomaterials under a 980 nm infrared laser on metal substrates. (a) Complete fingerprint without IR light, (b) dustpan, (c) bifurcation, (d) ridge ends, (e) bridges and (f) islands.
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Photographs of latent fingerprints developed by NaGdF4:Yb,Er-Fe3O4 on various substrates. (a) Metal, (b) glass, (c) ceramic, (d) acrylic, (e) bank card, (f) nail clipper, (g) mobile phone screen, (h) tin foil, (i) A4 paper, (j) envelope, (k) voucher and (l) playing card.
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