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Rhodium Nanocubes and Nanotripods for Highly Sensitive Ultraviolet Surface-Enhanced Raman Spectroscopy

Abstract

We report shape and wavelength dependent ultrasensitive label-free detection of adenine on rhodium cube and tripod star like nanoparticles (Rh NPs) using ultraviolet surface-enhanced Raman scattering (UVSERS). Rh NPs immobilized on a silane treated glass substrate probed at near-resonant and non-resonant wavelengths serve as the SERS platform for highly reproducible, stable and real-time detection of adsorbed adenine molecules in the femtomolar regime. The sensitivity of SERS active Rh NPs displaying LSPR in the UV region was exploited for 266nm (DUV), 325nm (UV) and 532nm (visible) Raman excitation wavelengths. With 266nm and 325nm DUV-UV excitation lines, for Rh tripod geometry near or pre-resonant excitation closer to analyte absorption band combined with intrinsic UV-LSPR resonant energy produces SERS enhancement factor as high as 105 and accelerated photo−induced degradations compared to 532nm for our substrates. Computational results consistent with experiment clearly demonstrate that the NP SERS enhancement is sensitive to both intrinsic optical properties of Rh in the UV region and excitation closer to LSPR peak producing larger EM enhancements. The wavelength dependent correlations between optical properties of shape tailored Rh NPs and SERS enhancements envisage the merit and demerit of DUV−UV excitation over visible excitation for Raman measurements. The as-fabricated SERS substrate can also be efficiently recycled using O2 plasma for detection of other biomolecules. The use of oxide-free transition metal Rh and DUV−UV excitation thereby extends the improved generality of SERS technique for ultrasensitive bimolecular detection and comprehensive understanding of UVSERS based applications.

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Publication details

The article was received on 22 Feb 2018, accepted on 06 Apr 2018 and first published on 06 Apr 2018


Article type: Paper
DOI: 10.1039/C8AN00341F
Citation: Analyst, 2018, Accepted Manuscript
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    Rhodium Nanocubes and Nanotripods for Highly Sensitive Ultraviolet Surface-Enhanced Raman Spectroscopy

    R. Das and R. Soni, Analyst, 2018, Accepted Manuscript , DOI: 10.1039/C8AN00341F

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