Surface-enhanced infrared spectroscopy using nanometer-sized gaps

• Verfasst von: Huck, Christian [VerfasserIn]
• Verfasst von: Neubrech, Frank [VerfasserIn]
• Verfasst von: Vogt, Jochen [VerfasserIn]
• Verfasst von: Toma, Andrea [VerfasserIn]
• Verfasst von: Gerbert, David [VerfasserIn]
• Verfasst von: Katzmann, Julia [VerfasserIn]
• Verfasst von: Härtling, Thomas [VerfasserIn]
• Verfasst von: Pucci, Annemarie [VerfasserIn]
• Titel: Surface-enhanced infrared spectroscopy using nanometer-sized gaps
• Verf.angabe: Christian Huck, Frank Neubrech, Jochen Vogt, Andrea Toma, David Gerbert, Julia Katzmann, Thomas Härtling, and Annemarie Pucci
• E-Jahr: 2014
• Jahr: April 11, 2014
• Umfang: 7 S.
• Fussnoten: Gesehen am 01.09.2020
• Titel Quelle: Enthalten in: American Chemical SocietyACS nano
• Ort Quelle: Washington, DC : Soc., 2007
• Jahr Quelle: 2014
• Band/Heft Quelle: 8(2014), 5, Seite 4908-4914
• ISSN Quelle: 1936-086X
• DOI: doi:10.1021/nn500903v
• Datenträger: Online-Ressource
• Sprache: eng
• K10plus-PPN: 1728502144

Abstract

We report on the near-field coupling of individual gold nanoantennas arranged in tip-to-tip dimer configuration, leading to strong electromagnetic field enhancements in the infrared, which is of great interest for sensing applications such as surface-enhanced infrared spectroscopy. We quantitatively evaluated the enhancement of vibrational excitations of a 5 nm thick test layer of 4,4′-bis(N-carbazolyl)-1,1′-biphenyl as a function of different gap sizes. The dimers with the smallest gaps under investigation (∼3 nm) lead to more than 1 order of magnitude higher signal enhancement with respect to gaps of 50 nm width. The comparison of experimental data and finite-difference time-domain simulations reveals a nonperfect filling of the gaps with sizes below 10 nm, which means that morphological information on the nanoscale is obtained additionally to chemical information.