In the recent years researchers worldwide explore alternative plasmonic material systems to go beyond gold and silver [1]. Highly doped semiconductor, e.g. Si-doped InAs, allows to exploit plasmonic resonances in the infrared. This III-V material platform, integrable with Si-photonics, allows to fabricate infrared plasmonic resonator for surface-enhanced infrared absorbtion (SEIRA) spectroscopy [2]. We could show in a recent work that phosphonic acid chemistry allows to form self-assembled monolayer (SAM) on III-V plasmonic resonators [3]. The organic-inorganic bounding which leads to the SAM is based on metal-oxide phosphonate bonding [4]. Surface enhanced Raman spectroscopy (SERS) with Ga-nanoparticles has been demonstrated [5]. Few nanometers of Gallium oxide covering these particles [6] allowing to explore phosphonic acid chemistry on Ga-nanoparticles for molecular sensing systems. We used the same molecule and the same protocol than for III-V semiconductor surfaces (mid-IR plasmonics) in the case of Ga-nanoparticles surfaces (UV/vis plasmonics). We made a comparative study between these to system notably for surface-enhanced spectroscopy, in particular, a SERS/SEIRA comparison.
References
[1] G. V. Naik, V. M. Shalaev, and A. Boltasseva, “Alternative Plasmonic Materials: Beyond Gold and Silver,” Adv. Mater., vol. 25, no. 24, pp. 3264–3294, Jun. 2013.
[2] F. B. Barho et al., “Highly doped semiconductor plasmonic nanoantenna arrays for polarization selective broadband surface-enhanced infrared absorption spectroscopy of vanillin,” Nanophotonics, vol. 7, no. 2, Dec. 2017.
[3] M. Bomers et al., “Phosphonate monolayers on InAsSb:Si and GaSb surfaces for mid-IR plasmonics,” Appl. Surf. Sci.(submitted)
[4] S. P. Pujari, L. Scheres, A. T. M. Marcelis, and H. Zuilhof, “Covalent Surface Modification of Oxide Surfaces,” Angew. Chem. Int. Ed., vol. 53, no. 25, pp. 6322–6356, Jun. 2014.
[5] Y. Yang, J. M. Callahan, T.-H. Kim, A. S. Brown, and H. O. Everitt, “Ultraviolet Nanoplasmonics: A Demonstration of Surface-Enhanced Raman Spectroscopy, Fluorescence, and Photodegradation Using Gallium Nanoparticles,” Nano Lett., vol. 13, no. 6, pp. 2837–2841, Jun. 2013.
[6] S. Catalán-Gómez et al., “The role of the oxide shell in the chemical functionalization of plasmonic gallium nanoparticles,” 2017, p. 102310D.
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