Seeing through walls at the nanoscale: microwave microscopy of enclosed objects and processes in liquids
Alexander Tselev, Jeyavel Velmurugan, Anton Ievlev, Sergei Kalinin, Andrei Kolmakov
Noninvasive in situ nanoscale imaging in liquid environments is a current imperative in analysis of delicate bio-medical objects and electrochemical processes at reactive liquid-solid interfaces. Microwaves of a few gigahertz frequency offer photons of energies 10 μeV, which can affect neither electronic states, nor chemical bonds in condensed matter. Here, we describe an implementation of scanning near-field microwave microscopy for imaging in liquids using ultrathin molecular impermeable membranes separating scanning probes from samples enclosed in environmental cells. We imaged a model electroplating reaction as well as individual live cells. Through a side-by-side comparison of the microwave imaging with scanning electron microscopy, we demonstrate the advantage of microwaves for artifact-free imaging.
, Velmurugan, J.
, Ievlev, A.
, Kalinin, S.
and Kolmakov, A.
Seeing through walls at the nanoscale: microwave microscopy of enclosed objects and processes in liquids, ACS Nano, [online], https://doi.org/10.1021/acsnano.5b07919, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=919781
(Accessed December 9, 2023)