Abstract
Size controlled CTAB-capped AuNRs with various aspect ratios (ARs) ranging from 1.63±0.13 to 4.12±0.25 were synthesized following a modified seed-mediated method. Their thermal stability was examined by in-situ TEM heating. The results revealed a structural change from rods to spheres with increasing temperature. At lower temperatures < 300ºC, the AR decreased rapidly and, for temperatures >600ºC, particles became increasingly spherical. This behaviour occurred at temperatures lower than the melting point of bulk gold supporting a surface diffusion mechanism with material diffusing from the tips and redepositing at the middle of the rods. The rate of change in AR appeared to increase for thinner AuNRs.
Highlights
Gold nanorods (AuNRs) play an important role in various applications due to their shape-dependent optical properties which can be tuned into the near infrared (NIR) region for the purposes of in-vivo photothermal therapy and ultrasound imaging which take advantage of the NIR window in biological tissue [1]
The longitudinal plasmon resonance has been found to be very sensitive to the aspect ratio (AR) of the rods, controlling the aspect ratios (ARs) via a facile synthesis procedure is of importance
The longitudinal plasmon resonances of the synthesized rods ranged from the visible region (575 nm) to the NIR (800 nm) according to their AR
Summary
Gold nanorods (AuNRs) play an important role in various applications due to their shape-dependent optical properties which can be tuned into the near infrared (NIR) region for the purposes of in-vivo photothermal therapy and ultrasound imaging which take advantage of the NIR window in biological tissue [1]. AuNRs exhibit two surface plasmon resonances: transverse and longitudinal [1, 2]. The longitudinal plasmon resonance has been found to be very sensitive to the aspect ratio (AR) of the rods, controlling the AR via a facile synthesis procedure is of importance. There are reports of a decrease in the AR of AuNRs during exposure to ultrafast pulsed laser radiation and thermal heating [3]. The thermal stability study of AuNRs is of interest both fundamentally and for their use in specific medical applications
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