Elucidation of the bonding of a near infrared dye to hollow gold nanospheres - a chalcogen tripod

Chemical Science
H KearnsW Ewen Smith

Abstract

Infrared surface enhanced Raman scattering (SERS) is an attractive technique for the in situ detection of nanoprobes in biological samples due to the greater depth of penetration and reduced interference compared to SERS in the visible region. A key challenge is to understand the surface layer formed in suspension when a specific label is added to the SERS substrate in aqueous suspension. SERS taken at different wavelengths, theoretical calculations, and surface-selective sum frequency generation vibrational spectroscopy (SFG-VS) were used to define the surface orientation and manner of attachment of a new class of infrared SERS labels with a thiopyrylium core and four pendant 2-selenophenyl rings. Hollow gold nanospheres (HGNs) were used as the enhancing substrate and two distinct types of SERS spectra were obtained. With excitation close to resonance with both the near infrared electronic transition in the label (max 826 nm) and the plasmon resonance maximum (690 nm), surface enhanced resonance Raman scattering (SERRS) was obtained. SERRS indicates that the major axis of the core is near to perpendicular to the surface plane and SFG-VS obtained from a dried gold film gave a similar orientation with the major axis at an angle ...Continue Reading

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Citations

Aug 10, 2017·Royal Society Open Science·Hayleigh KearnsDuncan Graham
Mar 17, 2018·Annual Review of Analytical Chemistry·Xin GuJon P Camden
Jul 7, 2017·Physical Chemistry Chemical Physics : PCCP·Dennis ElsenbeckLuis Velarde
May 26, 2020·The Journal of Organic Chemistry·Noriyoshi NagahoraKentaro Okuma
Apr 7, 2017·The Journal of Physical Chemistry Letters·Hubert K TurleyJon P Camden
Jul 16, 2020·Organic Letters·Noriyoshi NagahoraKentaro Okuma

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Methods Mentioned

BETA
surface enhanced Raman scattering
surface enhanced resonance Raman scattering
surface plasmon resonance

Software Mentioned

SFG
Gaussian
VS

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