fig6
![Recent advances in heavily doped plasmonic copper chalcogenides: from synthesis to biological application](https://image.oaes.cc/553510e7-6758-40d0-97d1-4515ea225056/5754.fig.6.jpg)
Figure 6. TEM (A). and HRTEM; (B) of Au-Cu2-xSe; (C) Optical absorbance of Au NPs (red) and Au-Cu2-xSe heterodimer NPs (black)[87]. Copyright © American Chemical Society 2013. HRTEM: high-resolution transmission electron microscope; TEM: transmission electron microscope.