Abstract
Gold nanorods with the longitudinal surface plasmon resonance (LSPR) wavelength up to 1245 nm are obtained by using an improved seed-mediated wet chemistry growth method where gallic acid is used as a reductant in the presence of a binary surfactant system. The effects of the gallic acid and the seed on the synthesised gold nanorods are investigated by ultraviolet–visible–near infrared spectroscopy and transmission electron microscopy (TEM). It is found that by increasing the gallic acid amount from 200 to 600 μL, the LSPR wavelength shifts from 975 to 1170 nm; at the same time, the absorption intensity of both the transverse surface plasmon resonance and LSPR increases, indicating a more complete reduction of chloroauric acid. To achieve a longer wavelength of the gold nanorods’ LSPR peak, the seed amount was changed to a condition of 600 μL gallic acid. A redshift of the LSPR wavelength from 1135 to 1245 nm can be obtained as the seed amount increases from 30 to 70 μL. Furthermore, it was found that the redshift of the LSPR peak with increasing seed amount is in accordance with the increase trend of the aspect ratio obtained by analysing the dimensions of the gold nanorods through the TEM images. The method offers a new strategy to obtain gold nanorods with tunable LSPR wavelengths, which have wide application in many areas, such as biosensing and ultrafast optical information.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
