Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film

Takei H, Bessho N, Ishii A, Okamoto T, Beyer A, Vieker H, Gölzhäuser A (2014)
Langmuir 30(8): 2297-2305.

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We report on optical properties of gold deposited on SiO2 nanospheres randomly adsorbed on a thin gold layer. Extinction peaks with optical density of more than 2 are observed in the visible as well as near-IR regimes. The peak wavelength of the latter was affected exquisitely by the thickness of the top layer. A helium ion microscope (HIM) was used for careful observation of morphological transformation accompanying the change in the deposition thickness. Growth of grain structures into a capped-dimer structure was accompanied by slight blue-shift of the visible peak and significantly greater red-shift of the near-IR peak. Our finite-difference time-domain (FDTD) calculations show that these peaks in the visible and near-IR can be respectively attributed to dipole modes associated with transverse and longitudinal oscillations of free electrons in the gold-capped dimer. To investigate the refractive index sensitivity of these peaks, we used two approaches: immersion in solutions of varying refractive index and coating with an organic layer. With the first approach that characterizes the bulk sensitivity, the visible peak shows sensitivity of 122 nm/RIU, while the near-I peak shifts at the rate of 506 nm/RIU. With the second approach that reflects the local sensitivity, the surface was saturated with alkaline phosphatase (ALP), whose subsequent reaction led to formation of a thin insoluble organic layer, causing a relatively small blue-shift, under 7 nm, of the visible peak and much larger red-shift, over 50 nm, of the near-IR peak when measured in buffer. When the same reaction was measured at end points in the air, the shift was as large as 444 nm for the near-IR peak.
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Takei H, Bessho N, Ishii A, et al. Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film. Langmuir. 2014;30(8):2297-2305.
Takei, H., Bessho, N., Ishii, A., Okamoto, T., Beyer, A., Vieker, H., & Gölzhäuser, A. (2014). Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film. Langmuir, 30(8), 2297-2305. doi:10.1021/la403407g
Takei, H., Bessho, N., Ishii, A., Okamoto, T., Beyer, A., Vieker, H., and Gölzhäuser, A. (2014). Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film. Langmuir 30, 2297-2305.
Takei, H., et al., 2014. Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film. Langmuir, 30(8), p 2297-2305.
H. Takei, et al., “Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film”, Langmuir, vol. 30, 2014, pp. 2297-2305.
Takei, H., Bessho, N., Ishii, A., Okamoto, T., Beyer, A., Vieker, H., Gölzhäuser, A.: Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film. Langmuir. 30, 2297-2305 (2014).
Takei, Hiroyuki, Bessho, Noriyuki, Ishii, Aira, Okamoto, Takayuki, Beyer, André, Vieker, Henning, and Gölzhäuser, Armin. “Enhanced Infrared LSPR Sensitivity of Cap-Shaped Gold Nanoparticles Coupled to a Metallic Film”. Langmuir 30.8 (2014): 2297-2305.
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Probing the Sulfur-Modified Capping Layer of Gold Nanoparticles Using Surface Enhanced Raman Spectroscopy (SERS) Effects.
Prado AR, Souza DO, Oliveira JP, Pereira RHA, Guimarães MCC, Nogueira BV, Dixini PV, Ribeiro MRN, Pontes MJ., Appl Spectrosc 71(12), 2017
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