In situ observation of structural transformation of gold nanorods under pulsed laser irradiation in an HVEM

Nao Sumimoto, Koichiro Nakao, Tomokazu Yamamoto, Kazuhiro Yasuda, Syo Matsumura, Yasuro Niidome

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A pulsed laser light illumination system was attached to a high-voltage electron microscope (HVEM) for in situ observation of light-induced behaviors of nano objects. The wavelength λ of emitted laser pulses was 1064, 532 or 266 nm, and the pulse duration was 6-8 ns. Using this combined HVEM system, we observed the deformation behavior of gold nanorods irradiated by a pulsed laser (λ = 1064 nm) at an intensity of 310 J m-2 pulse or higher. A single shot of pulsed laser reduced the aspect ratio of the gold nanorods from 5 to a much smaller value. The extent of the reduction increased at higher laser intensities. However, at 310 J m-2 pulse-1, additional pulsed shots induced limited further deformation. The mean aspect ratio approximated to 2.5 even after irradiation with 7 pulses (total fluence exceeding 2 MJ m-2). In situ high resolution transmission electron microscopy (HRTEM) observation revealed that deformation was accompanied by total atomic restructuring of the nanorod interiors.

Original languageEnglish
Pages (from-to)261-268
Number of pages8
JournalMicroscopy
Volume63
Issue number4
DOIs
Publication statusPublished - Jan 1 2014

Fingerprint

Nanotubes
Laser beam effects
Nanorods
Pulsed lasers
Gold
nanorods
high voltages
pulsed lasers
Lasers
Electron microscopes
electron microscopes
Observation
Electrons
gold
irradiation
Aspect ratio
Laser pulses
Electric potential
pulses
shot

All Science Journal Classification (ASJC) codes

  • Structural Biology
  • Instrumentation
  • Radiology Nuclear Medicine and imaging

Cite this

In situ observation of structural transformation of gold nanorods under pulsed laser irradiation in an HVEM. / Sumimoto, Nao; Nakao, Koichiro; Yamamoto, Tomokazu; Yasuda, Kazuhiro; Matsumura, Syo; Niidome, Yasuro.

In: Microscopy, Vol. 63, No. 4, 01.01.2014, p. 261-268.

Research output: Contribution to journalArticle

Sumimoto, Nao ; Nakao, Koichiro ; Yamamoto, Tomokazu ; Yasuda, Kazuhiro ; Matsumura, Syo ; Niidome, Yasuro. / In situ observation of structural transformation of gold nanorods under pulsed laser irradiation in an HVEM. In: Microscopy. 2014 ; Vol. 63, No. 4. pp. 261-268.
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