Abstract
| Language | English |
|---|---|
| Pages | 13740-13746 |
| Number of pages | 7 |
| Journal | ACS Omega |
| Volume | 4 |
| Issue number | 9 |
| Early online date | 15 Aug 2019 |
| DOIs | |
| Publication status | Published - 27 Aug 2019 |
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Keywords
- small gold nanorods
- synthesis
- functionalization
- surface plasmon
- oligonucleotide
Cite this
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Synthesis of small gold nanorods and their subsequent functionalization with hairpin single stranded DNA. / Mbalaha, Zendesha S.; Edwards, Paul R.; Birch, David J.S.; Chen, Yu.
In: ACS Omega, Vol. 4, No. 9, 27.08.2019, p. 13740-13746.Research output: Contribution to journal › Article
TY - JOUR
T1 - Synthesis of small gold nanorods and their subsequent functionalization with hairpin single stranded DNA
AU - Mbalaha, Zendesha S.
AU - Edwards, Paul R.
AU - Birch, David J.S.
AU - Chen, Yu
PY - 2019/8/27
Y1 - 2019/8/27
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.
KW - small gold nanorods
KW - synthesis
KW - functionalization
KW - surface plasmon
KW - oligonucleotide
U2 - 10.1021/acsomega.9b01200
DO - 10.1021/acsomega.9b01200
M3 - Article
VL - 4
SP - 13740
EP - 13746
JO - ACS Omega
T2 - ACS Omega
JF - ACS Omega
SN - 2470-1343
IS - 9
ER -