However, aspect ratio decrease was observed throughout the range of θ. A promising approach to directly visualize plasmonic hot electron deposition of secondary metal onto AuNRs was achieved through simultaneous in situ LSPR stimulation and direct imaging of nanorod growth via LP-TEM. This was achieved via delivery of Ag precursor and a sacrificial hole scavenger (IPA) in toluene, a radiolysis-resistant solvent. Complementary experiments and STEM-EDS characterization supported these observations. The observed nanorod growth dynamics were found to be consistent with a combination of hot carrier-mediated Ag deposition and Au etching/redeposition as opposed to redox by radiolytic chemical species (Figure ). Plasmonic simulations agreed with observations of accelerated growth at nanorod corners and growth rate trends as a function of electron flux and particle orientation. With continued refinement, we expect the approach established here can be extended to visualizing other plasmon-mediated phenomena, such as photocatalytic reactions that generate gaseous products.