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Orientation Sensitive SEIRA Sensors Based on Single-Walled Carbon Nanotube Near Fields

Journal Article · · Nano Letters
 [1];  [1];  [2]
  1. Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM); University of Chicago, IL (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM); University of Chicago, IL (United States); Rice University, Houston, TX (United States)
Molecular vibrations that bear information about intrinsic properties of chemical compounds are challenging to detect at submonolayer densities. Surface-enhanced infrared absorption (SEIRA) spectroscopy has been proven to be a viable approach to enhance and detect weak vibration signals. Here, in this study, we report a SEIRA sensor based on mid-infrared surface plasmon resonances supported by single-walled carbon nanotubes (SWCNTs). Due to the 1D nature of SWCNTs, their plasmon modes are highly polarized with the electromagnetic fields spatially confined to nanometer scales. Leveraging these characteristics of SWCNTs, we observe a polarization selective coupling between their surface plasmons and vibrational modes of chemical bonds introduced onto their surfaces. A maximum modulation of similar to 15% to the plasmon resonance peak is obtained for a submonolayer chemical group coverage. These findings suggest that SWCNTs may potentially serve as a highly sensitive SEIRA platform for revealing intricate information about molecular compositions and bond orientations.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2523626
Journal Information:
Nano Letters, Journal Name: Nano Letters Journal Issue: 34 Vol. 24; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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