| AVS 63rd International Symposium & Exhibition | |
| 2D Materials Focus Topic | Thursday Sessions |
| Session 2D-ThA |
| Session: | Surface Chemistry, Functionalization, Bio and Sensor Applications of 2D Materials |
| Presenter: | Karsten Hinrichs, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Germany |
| Authors: | C. Kratz, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Germany D. Gkogkou, Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof (SALSA), Germany F. Rösicke, Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof (SALSA), Germany T. Shaykhutdinov, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Germany T. Oates, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Germany A. Furchner, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Germany J. Rappich, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany K. Hinrichs, Leibniz-Institut für Analytische Wissenschaften - ISAS - e.V., Germany |
| Correspondent: | Click to Email |
Metallic island covered substrates for Surface Enhanced Infrared Absorption (SEIRA) [1] and Surface Enhanced Raman Scattering (SERS) [2] are excellent candidates for enhancement templates in biosensing applications. The specific enhancement behavior of the surfaces is due to their effective optical properties as well as localized and coupled surface plasmon effects. For a detailed understanding of this behavior Au and Ag silver island films on SiO2/Si with a lateral gradient in size distribution were characterized by IR laser ellipsometry [3] and VIS ellipsometry [4] in combination with numerical and analytical calculations. Along the gradient of the metallic island film, measurements of the IR enhancement of vibrational bands of a Self-Assembling Monolayer adsorbed on the surface as well as a band of the SiO2 below the island film were performed. The metallic island substrates increase the detection limit and enable new applications, anisotropic substrates allow to separate signals from solvated molecules from adsorbed ones. [2] On the way towards applications as biosensors, the effective and reliable functionalization of these surfaces is an important step. For this we studied a direct electrochemical functionalization of the metal particles from diazonium compounds [5-6] and an indirect route by transferring pre-functionalized graphene sheets to our substrates. [7] For quantitative evaluation the surfaces were characterized in a multi-method approach using UV-VIS ellipsometry, IR ellipsometry, IR microscopy, Raman spectroscopy and IR-AFM.
References
[1] C. Kratz, T. W. H. Oates, K. Hinrichs, Thin Solid Films (2016) in press.
[2] D. Gkogkou, B. Schreiber, T. Shaykhutdinov, H.K. Ly, U. Kuhlmann, U. Gernert, S. Facsko, P. Hildebrandt, N. Esser, K. Hinrichs, I.M. Weidinger, T.W.H. Oates, ACS Sensors, 1 (2016) 318-323.
[3] A. Furchner et al, submitted to Appl. Surface Science.
[4] D. Gkogkou et al, submitted to Appl. Surface Science
[5] P. Kanyong, G. Sun, F. Rösicke, V. Syritski, U. Panne, K. Hinrichs, and J. Rappich; Electrochem. Commun. 51, 103 (2015).
[6] X. Zhang, A. Tretjakov, M. Hovestaedt, G. Sun, V. Syritski, J. Reut, R. Volkmer, K. Hinrichs, and J. Rappich; Acta Biomaterialia 9, 5838 (2013).
[7] F. Rösicke et al, to be submitted.