Transparent Metal Films for Detection of Single-Molecule Optical Absorption by Scanning Tunneling Microscopy
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- 作者：Lea Nienhaus ; Gregory E. Scott ; Richard T. Haasch ; Sarah Wieghold ; Joseph W. Lyding ; Martin Gruebele
- 刊名：Journal of Physical Chemistry C
- 出版年：2014
- 出版时间：June 19, 2014
- 年：2014
- 卷：118
- 期：24
- 页码：13196-13202
- 全文大小：566K
- 年卷期：v.118,no.24(June 19, 2014)
- ISSN：1932-7455
文摘
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鈥揂u films and of the achieved morphologies. SMA-STM is detected for a quantum dot deposited by aerosol spraying onto Pt鈥揂u films, demonstrating the suitability of such films for single-molecule absorption spectroscopy studies.