Spectroscopic determination of the melting energy of a gold nanorod

Journal of Chemical Physics

Volumn 114, Issue 5, 2001, Pages 2362-2368

  Link, S ^a   Ei Sayed, M A ^a  

^a GEORGIA INSTITUTE OF TECHNOLOGY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

ASPECT RATIO; ATOMIC SPECTROSCOPY; COLLOIDS; EMISSION SPECTROSCOPY; LASER PULSES; LIGHT ABSORPTION; METAL MELTING; NANOSTRUCTURED MATERIALS; PARTICLE SIZE ANALYSIS; TRANSMISSION ELECTRON MICROSCOPY; ULTRAFAST PHENOMENA;

ATOMIC EMISSION SPECTROSCOPY (AES); GOLD NANORODS; NANOPARTICLES;

GOLD;

EID: 0034825157     PISSN: 00219606     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.1336140     Document Type: Article

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45. An error analysis with error propagation was carried out assuming that the error for the energy threshold as determined from Fig. 3 is about ± 0.5 μJ (or 10%) for excitation with 820 nm femtosecond pulses. The error in the absorbance was taken to be 5% of the measured value due to the inaccu" racy of the absorbance reading of the spectrophotometer and a possible error regarding the wavelength scale on this instrument as well as for the excitation pulse. For the size of the beam diameter, an error of 5% was assumed. Due to the presence of spherical nanoparticles the nanorod concentration is associated with a considerably larger error. For this analysis an error of 20% was used. This yields an error of about ± 20 fJ or roughly 30% for the energy required to melt a nanorod.
46. The absorbence at the excitation wavelength of 820 nm is composed of the contribution from all the nanorods with absorption maxima at different wavelength according to their aspect ratios. The fact that the longitudinal surface plasmon absorption is not homogeneously broadened can be concluded from the observation that it is possible to selectively destroy a part of the nanorod distribution and burn an optical hole into the longitudinal surface plasmon absorption band as seen in Figs. 1(b) and 1(c).