Synthesis and NIR optical properties of hollow gold nanospheres with LSPR greater than one micrometer

Hai-nan Xie, Iain A. Larmour, Yi-Chieh Chen, Alastair W. Wark, Vasiliki Tileli, David W. McComb, Karen Faulds, Duncan Graham

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Optical analysis in the near infrared region is of significant biological importance due to better tissue penetration and reduced autofluorescence. In this work, an improved synthesis of hollow gold nanospheres (HGNs), which provides a tunable localized surface plasmon resonance (LSPR) from 610 nm up to 1320 nm, is demonstrated. The scattering properties of these nanoparticles are shown using surface enhanced Raman scattering (SERS) at 1064 nm excitation wavelength and are compared to citrate reduced gold and silver nanoparticles of similar physical sizes and surface properties. After the addition of salts, a strong signal was observed from hollow gold with a LSPR of 650 nm and a weaker, yet observable, signal from HGNs with a LSPR of 775 nm. However, no obvious signals were observed in the case of standard citrate reduced gold, silver or HGNs with a LSPR of 1080 nm. The absorption properties of HGNs were investigated by monitoring their photothermal activity. In this case, different nanoparticle suspensions including citrate reduced gold, silver, and HGNs were illuminated by a continuous laser at 785 nm excitation wavelength and the absorption efficiency of HGNs with a LSPR of 775 nm was calculated to be 0.81% which is more than 5 times higher than the absorption efficiency of citrate reduced gold nanoparticles under similar conditions.

LanguageEnglish
Pages765-771
Number of pages7
JournalNanoscale
Volume5
Issue number2
DOIs
Publication statusPublished - 2013

Fingerprint

Nanospheres
Surface plasmon resonance
Gold
Optical properties
Citric Acid
Silver
Nanoparticles
Wavelength
Surface properties
Raman scattering
Suspensions
Salts
Scattering
Tissue
Infrared radiation

Keywords

  • optical analysis
  • near infrared region
  • gold nanospheres
  • localized surface plasmon resonance

Cite this

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title = "Synthesis and NIR optical properties of hollow gold nanospheres with LSPR greater than one micrometer",
abstract = "Optical analysis in the near infrared region is of significant biological importance due to better tissue penetration and reduced autofluorescence. In this work, an improved synthesis of hollow gold nanospheres (HGNs), which provides a tunable localized surface plasmon resonance (LSPR) from 610 nm up to 1320 nm, is demonstrated. The scattering properties of these nanoparticles are shown using surface enhanced Raman scattering (SERS) at 1064 nm excitation wavelength and are compared to citrate reduced gold and silver nanoparticles of similar physical sizes and surface properties. After the addition of salts, a strong signal was observed from hollow gold with a LSPR of 650 nm and a weaker, yet observable, signal from HGNs with a LSPR of 775 nm. However, no obvious signals were observed in the case of standard citrate reduced gold, silver or HGNs with a LSPR of 1080 nm. The absorption properties of HGNs were investigated by monitoring their photothermal activity. In this case, different nanoparticle suspensions including citrate reduced gold, silver, and HGNs were illuminated by a continuous laser at 785 nm excitation wavelength and the absorption efficiency of HGNs with a LSPR of 775 nm was calculated to be 0.81{\%} which is more than 5 times higher than the absorption efficiency of citrate reduced gold nanoparticles under similar conditions.",
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Synthesis and NIR optical properties of hollow gold nanospheres with LSPR greater than one micrometer. / Xie, Hai-nan; Larmour, Iain A.; Chen, Yi-Chieh; Wark, Alastair W.; Tileli, Vasiliki; McComb, David W.; Faulds, Karen; Graham, Duncan.

In: Nanoscale, Vol. 5, No. 2, 2013, p. 765-771.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Synthesis and NIR optical properties of hollow gold nanospheres with LSPR greater than one micrometer

AU - Xie, Hai-nan

AU - Larmour, Iain A.

AU - Chen, Yi-Chieh

AU - Wark, Alastair W.

AU - Tileli, Vasiliki

AU - McComb, David W.

AU - Faulds, Karen

AU - Graham, Duncan

PY - 2013

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AB - Optical analysis in the near infrared region is of significant biological importance due to better tissue penetration and reduced autofluorescence. In this work, an improved synthesis of hollow gold nanospheres (HGNs), which provides a tunable localized surface plasmon resonance (LSPR) from 610 nm up to 1320 nm, is demonstrated. The scattering properties of these nanoparticles are shown using surface enhanced Raman scattering (SERS) at 1064 nm excitation wavelength and are compared to citrate reduced gold and silver nanoparticles of similar physical sizes and surface properties. After the addition of salts, a strong signal was observed from hollow gold with a LSPR of 650 nm and a weaker, yet observable, signal from HGNs with a LSPR of 775 nm. However, no obvious signals were observed in the case of standard citrate reduced gold, silver or HGNs with a LSPR of 1080 nm. The absorption properties of HGNs were investigated by monitoring their photothermal activity. In this case, different nanoparticle suspensions including citrate reduced gold, silver, and HGNs were illuminated by a continuous laser at 785 nm excitation wavelength and the absorption efficiency of HGNs with a LSPR of 775 nm was calculated to be 0.81% which is more than 5 times higher than the absorption efficiency of citrate reduced gold nanoparticles under similar conditions.

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