Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
The Raman spectra of silica (1), silicon (2), and graphene on silicon (3). Spectra are not normalized but only shifted along the vertical axis for clarity. Inset: microscopic image of a dried micro-droplet of adenine solution deposited on the graphene surface
