We have synthesized Ag nanoplates with strong absorption in the near-infrared region (NIR) using a modification of the seed-mediated method. Ag nanoplate seeds having in-plane dipole plasmonic peaks in the range of 550 – 800 nm were used to grow nanoplates with in-plane dipole plasmonic peaks resonating in NIR from 800 to 1660 nm. We investigated the role of citrate as capping agent for Ag nanoplate seeds and its effect on the growth rate. The structural morphologies and the in-plane dipole resonance plasmonic peaks were characterized by transmission electron microscopy (TEM) and UV-Visible-NIR spectroscopy, respectively. These results demnostrated that the nanoplates had the {111} surface atomically flat. Through this method, we are able to synthesize Ag nanoplates with lateral dimensions from 100 to 600 nm. Importantly, compared to the existing photoinduced methods, our approach is simple and fast and does not require any post-synthesis purification processes. In addition, these plasmonic Ag nanoplates resonating in the NIR have potential applications in biological systems, communication devices, and glass coatings.

Synthesis of near-infrared light absorbing Ag nanoplates through multiple seed-mediated steps

254th National Meeting (2017)

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