AVS 59th Annual International Symposium and Exhibition
    Nanometer-scale Science and Technology Thursday Sessions
       Session NS-ThP

Paper NS-ThP3
Integrated Ultra-High Vacuum Tip-Enhanced Raman Spectroscopy with Molecular-Resolution Microscopy of Large Polyatomic Molecular Adsorbates on Single Crystal Surfaces

Thursday, November 1, 2012, 6:00 pm, Room Central Hall

Session: Nanometer-scale Science and Technology Poster Session
Presenter: N. Jiang, Northwestern University
Authors: N. Jiang, Northwestern University
E.T. Foley, Northwestern University
J.M. Klingsporn, Northwestern University
M.D. Sonntag, Northwestern University
M.C. Hersam, Northwestern University
R.P. Van Duyne, Northwestern University
Correspondent: Click to Email
Multiple vibrational modes have been observed for copper phthalocyanine (CuPc) adlayers on Ag(111) using ultrahigh vacuum (UHV) tip-enhanced Raman spectroscopy (TERS). Several important new experimental features are introduced in this work that significantly advance the state-of-the-art in UHV-TERS. These include (1) concurrent sub-nm molecular resolution STM imaging using Ag tips with laser illumination of the tip−sample junction, (2) laser focusing and Raman collection optics that are external to the UHV-STM that has two cryoshrouds for future low temperature experiments, and (3) all sample preparation steps are carried out in UHV to minimize contamination and maximize spatial resolution. Further, density-functional theory calculations have been carried out that allow quantitative identification of eight different vibrational modes in the TER spectra. The combination of molecular-resolution UHV-STM imaging with the detailed chemical information content of UHV-TERS allows the interactions between large polyatomic molecular adsorbates and specific binding sites on solid surfaces to be probed with unprecedented spatial and spectroscopic resolution.