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We have investigated in detail the growth dynamics of gold nanorods withvarious aspect ratios in different surrounding environments. Surprisingly, ablue shift in the temporal evolution of colloidal gold nanorods in aqueousmedium has been observed during the growth of nanorods by UV visible absorptionspectroscopy. The longitudinal surface plasmon resonance peak evolves as soonas the nanorods start to grow from spheres, and the system undergoes a blueshift in the absorption spectra. Although a red-shift is expected as a naturalphenomenon during the growth process of all nanosystems, our blue shiftobservation is regarded as a consequence of competition between the parametersof growth solution and actual growth of nanorods. The growth of nanorodscontributes to the red-shift which is hidden under the dominating contributionof the growth solution responsible for the observed massive blue shift.

Understanding blue shift of the longitudinal surface plasmon resonance during growth of gold nanorods