Transparent metal films for detection of single-molecule optical absorption by scanning tunneling microscopy

Lea Nienhaus, Gregory E. Scott, Richard T. Haasch, Sarah Wieghold, Joseph W. Lyding, Martin Gruebele

Research output: Contribution to journalArticle

Abstract

Atomically flat, conductive, and transparent noble metal films are produced to extend the wavelength range of room-temperature single-molecule optical absorption detected by scanning tunneling microscopy (SMA-STM). Gold films grown on a platinum underlayer to 15 nm total thickness, deposited by electron beam evaporation onto c-plane sapphire substrates, show sufficient light transmission for backside illumination for laser-assisted STM experiments. Low resistance, transparency, and the atomically flat island surfaces make these good substrates for SMA-STM studies. Monte Carlo lattice kinetics were simulated to allow for a better understanding of the growth modes of the Pt-Au films and of the achieved morphologies. SMA-STM is detected for a quantum dot deposited by aerosol spraying onto Pt-Au films, demonstrating the suitability of such films for single-molecule absorption spectroscopy studies.

Original languageEnglish (US)
Pages (from-to)13196-13202
Number of pages7
JournalJournal of Physical Chemistry C
Volume118
Issue number24
DOIs
StatePublished - Jun 19 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Fingerprint Dive into the research topics of 'Transparent metal films for detection of single-molecule optical absorption by scanning tunneling microscopy'. Together they form a unique fingerprint.

  • Cite this