Synthesis of small gold nanorods and their subsequent functionalization with hairpin single stranded DNA

Research output: Contribution to journalArticle

Abstract

Small gold nanorods have a significantly large absorption/scattering ratio and are especially beneficial in exploiting photothermal effects, for example in photothermal therapy and remote drug release. This work systematically investigates the influence of growth conditions on the size, growth yield and stability of small gold nanorods. The silver-assisted seed-mediated growth method was optimised to synthesize stable small gold nanorods with a high growth yield (>85%). Further study on the influence of silver ions on the growth facilitates the growth of small gold nanorods with tuneable longitudinal surface plasmon resonance from 613 nm to 912 nm, with average dimensions of 13-25 nm in length and 5-6 nm in diameter. Moreover, the small gold nanorods were successfully functionalized with thiol- modified hairpin oligonucleotides (hpDNA) labelled with Cy5. Fluorescence intensity measurements show an increase in the presence of target DNA and an enhanced signal/background ratio when the longitudinal surface plasmon resonance of small gold nanorods overlaps with the excitation and emission wavelength of Cy5. This coincides with a reduced fluorescence lifetime of Cy5 in the hairpin structure, indicating surface plasmon resonance enhanced energy transfer to the small gold nanorods. This study may provide insight on the synthesis and functionalization of small gold nanorods in biomedical sensing and therapy.
LanguageEnglish
Pages13740-13746
Number of pages7
JournalACS Omega
Volume4
Issue number9
Early online date15 Aug 2019
DOIs
Publication statusPublished - 27 Aug 2019

Fingerprint

Single-Stranded DNA
Nanorods
Gold
DNA
Surface plasmon resonance
Silver
Fluorescence
Oligonucleotides
Sulfhydryl Compounds
Energy transfer
Seed
Scattering
Ions
Wavelength
Pharmaceutical Preparations

Keywords

  • small gold nanorods
  • synthesis
  • functionalization
  • surface plasmon
  • oligonucleotide

Cite this

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title = "Synthesis of small gold nanorods and their subsequent functionalization with hairpin single stranded DNA",
abstract = "Small gold nanorods have a significantly large absorption/scattering ratio and are especially beneficial in exploiting photothermal effects, for example in photothermal therapy and remote drug release. This work systematically investigates the influence of growth conditions on the size, growth yield and stability of small gold nanorods. The silver-assisted seed-mediated growth method was optimised to synthesize stable small gold nanorods with a high growth yield (>85{\%}). Further study on the influence of silver ions on the growth facilitates the growth of small gold nanorods with tuneable longitudinal surface plasmon resonance from 613 nm to 912 nm, with average dimensions of 13-25 nm in length and 5-6 nm in diameter. Moreover, the small gold nanorods were successfully functionalized with thiol- modified hairpin oligonucleotides (hpDNA) labelled with Cy5. Fluorescence intensity measurements show an increase in the presence of target DNA and an enhanced signal/background ratio when the longitudinal surface plasmon resonance of small gold nanorods overlaps with the excitation and emission wavelength of Cy5. This coincides with a reduced fluorescence lifetime of Cy5 in the hairpin structure, indicating surface plasmon resonance enhanced energy transfer to the small gold nanorods. This study may provide insight on the synthesis and functionalization of small gold nanorods in biomedical sensing and therapy.",
keywords = "small gold nanorods, synthesis, functionalization, surface plasmon, oligonucleotide",
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AU - Edwards, Paul R.

AU - Birch, David J.S.

AU - Chen, Yu

PY - 2019/8/27

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N2 - Small gold nanorods have a significantly large absorption/scattering ratio and are especially beneficial in exploiting photothermal effects, for example in photothermal therapy and remote drug release. This work systematically investigates the influence of growth conditions on the size, growth yield and stability of small gold nanorods. The silver-assisted seed-mediated growth method was optimised to synthesize stable small gold nanorods with a high growth yield (>85%). Further study on the influence of silver ions on the growth facilitates the growth of small gold nanorods with tuneable longitudinal surface plasmon resonance from 613 nm to 912 nm, with average dimensions of 13-25 nm in length and 5-6 nm in diameter. Moreover, the small gold nanorods were successfully functionalized with thiol- modified hairpin oligonucleotides (hpDNA) labelled with Cy5. Fluorescence intensity measurements show an increase in the presence of target DNA and an enhanced signal/background ratio when the longitudinal surface plasmon resonance of small gold nanorods overlaps with the excitation and emission wavelength of Cy5. This coincides with a reduced fluorescence lifetime of Cy5 in the hairpin structure, indicating surface plasmon resonance enhanced energy transfer to the small gold nanorods. This study may provide insight on the synthesis and functionalization of small gold nanorods in biomedical sensing and therapy.

AB - Small gold nanorods have a significantly large absorption/scattering ratio and are especially beneficial in exploiting photothermal effects, for example in photothermal therapy and remote drug release. This work systematically investigates the influence of growth conditions on the size, growth yield and stability of small gold nanorods. The silver-assisted seed-mediated growth method was optimised to synthesize stable small gold nanorods with a high growth yield (>85%). Further study on the influence of silver ions on the growth facilitates the growth of small gold nanorods with tuneable longitudinal surface plasmon resonance from 613 nm to 912 nm, with average dimensions of 13-25 nm in length and 5-6 nm in diameter. Moreover, the small gold nanorods were successfully functionalized with thiol- modified hairpin oligonucleotides (hpDNA) labelled with Cy5. Fluorescence intensity measurements show an increase in the presence of target DNA and an enhanced signal/background ratio when the longitudinal surface plasmon resonance of small gold nanorods overlaps with the excitation and emission wavelength of Cy5. This coincides with a reduced fluorescence lifetime of Cy5 in the hairpin structure, indicating surface plasmon resonance enhanced energy transfer to the small gold nanorods. This study may provide insight on the synthesis and functionalization of small gold nanorods in biomedical sensing and therapy.

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