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Figure 6. TEM (A). and HRTEM; (B) of Au-Cu Se; (C) Optical absorbance of Au NPs (red) and Au-Cu Se heterodimer NPs
2-x
2-x
(black) [87] . Copyright © American Chemical Society 2013. HRTEM: high-resolution transmission electron microscope; TEM: transmission
electron microscope.
upconversion core-shell structures of semiconductor plasmonic nanoparticles. It provided a reference for
the application of upconversion nanocrystals (UCNPs) and semiconductor plasmonic nanoparticles in
photonics . Another group, Cui et al., also designed and synthesized high-efficiency photothermal
[103]
semiconductor nanocomposites for potential fingerprint photothermal imaging . They used a novel
[104]
method to synthesize Cu S NCs with good photothermal properties and fabricated amphiphilic
7 4
nanocomposites with good affinity by coating Cu S nanoparticles with allyl thiol polymerization, as shown
7 4
in Figure 7C and D. Due to the high photothermal conversion efficiency of Cu S NCs, they were developed
7 4
as a simple and versatile photothermal latent fingerprints (LFPs) imaging method, which was demonstrated
to be effective for imaging of LFP residual on different substrates (different background colors), as shown in
Figure 7E. It would be very helpful for crime scene investigation. In addition, it was produced, and the dual-
mode fluorescence-photothermal imaging techniques were used to monitor trinitrotoluene, the integrated
photothermal image of LFPs.

In vivo imaging
Over the past few decades, nanomaterials have led to the rapid development of emerging in vivo imaging
techniques. The close collaboration between chemists and imaging scientists plays a decisive role in the
application of emerging nanomaterials to solve difficult clinical problems. The application of nanomaterials