Fabrication of silica-coated gold nanorods and investigation of their property of photothermal conversion

Tomoya Inose, Takahiro Oikawa, Kyosuke Shibuya, Masayuki Tokunaga, Keiichiro Hatoyama, Kouichi Nakashima, Takashi Kamei, Kohsuke Gonda, Yoshio Kobayashi

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


This study described the preparation of silica-coated Au nanorods (AuNR/SiO2) in a colloidal solution, assessed their property of photothermal conversion, and investigated their ability to kill cancer cells using photothermal conversion. Au-seed nanoparticles were produced by reducing hydrogen tetrachloroaurate (HAuCl4) with sodium borohydride (NaBH4) in aqueous n-hexadecyltrimethylammonium bromide (CTAB) solution. AuNRs were then fabricated by reducing HAuCl4 and silver nitrate (AgNO3) with L-ascorbic acid in the aqueous CTAB solution in the presence of Au-seed nanoparticles. The as-prepared AuNRs were washed by a process composed mainly of centrifugation to remove the CTAB. The washed AuNRs were coated with silica by mixing the AuNR colloidal solution, an aqueous solution of (3-aminopropyl)trimethoxysilane, and tetraethylorthosilicate/ethanol solution with a water/ethanol solution. We found that the addition of AuNR/SiO2 in water, in mice, and in a culture medium with cancer cells, followed by irradiation with a laser, cause an increase in temperature, demonstrating that AuNR/SiO2 have the ability of photothermal conversion. In addition, the cancer cells in the culture medium were found to be killed due to the increase in temperature caused by the photothermal conversion.

Original languageEnglish
Pages (from-to)318-322
Number of pages5
JournalBiochemical and biophysical research communications
Issue number2
Publication statusPublished - 2017 Mar 4


  • Au
  • Core-shell
  • Nanorod
  • Photothermal conversion
  • Silica
  • Sol-gel

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology


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