Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 106: Scanning Probe Microscopy: Light Matter Interaction at Atomic Scales IV

O 106.1: Talk

Friday, March 22, 2024, 10:30–10:45, MA 041

Probing Local Structural and Chemical Properties of Borophene via Tip-Enhanced Raman Spectroscopy — Linfei Li and •Nan Jiang — University of Illinois Chicago, Chicago, IL, 60607

Two-dimensional boron (i.e., borophene) has recently been synthesized and computationally predicted to have promising physical properties for a variety of electronic and energy technologies. However, the fundamental chemical properties of borophene that form the foundation of practical applications remain unexplored. Here, we present atomic-level chemical characterization of borophene materials using ultrahigh vacuum tip-enhanced Raman spectroscopy (UHV-TERS). Atomic-level chemical characterization of SL and BL borophene was achieved by TERS with an angstrom-scale vibrational fingerprint observation. Following that, we measure the interfacial interactions of a vertical Van der Waals heterostructure of borophene with tetraphenyldibenzoperiflanthene (DBP) molecules. TERS reveals subtle ripples and compressive strains of the borophene lattice underneath the molecular layer. The induced interfacial strain is demonstrated to extend in borophene by ~1 nm beyond the molecular region. Furthermore, we use our method to probe the local chemical properties of oxidized borophene. The results show that single oxygen adatoms on borophene can be identified and mapped with ~4.8 Å spatial resolution and single bond (B-O) sensitivity.

Keywords: tip-enhanced Raman spectroscopy; Borophene; scanning tunnelling microscopy; 2D materials; plasmonics