Thanks to biotech analyst Karen Kingston. This is the nanotechnology used on the C shot. Here is the patent. You will see at the bottom of the patent, Owner name: NATIONAL INSTITUTES OF HEALTH (NIH). From 2015. Here are two interesting parts in the patent
a) In some embodiments, the toxin is from a chemical weapon, an agent of biowarfare, or a hazardous environmental agent.
b) A nanocarrier can be lipid nanoparticles and metallic nanoparticles

https://patents.google.com/patent/US9539210B2