Signal size and resolution of scanning thermal microscopy in air and vacuum

Published

April 1, 2025

Author(s)

Jabez McClelland, Evgheni Strelcov, Ami Chand

Abstract

We present measurements comparing scanning thermal microscopy in air and vacuum. Signal levels are compared and resolution is probed by scanning over the edge of a nanofabricated Ag square embedded in SiO2. Signals measured in air were seen to be 2.5 to 40 times larger than in vacuum. Furthermore, the air signals were stable while the vacuum signals varied significantly. Edge widths measured in air were approximately 39 % larger than those measured in vacuum. Our observations are consistent with the air measurements experiencing heat transfer from the surrounding sample via conduction and convection as well as the formation of a water meniscus at the tip-sample interface. These results contribute to the understanding of the complex heat exchange effects that can occur in scanning thermal microscopy when it is conducted in an ambient atmosphere.

Citation

Nature - Scientific Reports

Volume

15

Issue

1

Pub Type

Journals

Download Paper

https://doi.org/10.1038/s41598-025-95648-w

Local Download

Keywords

SThM, scanning thermal miscocopy, thermal measurements, thermocoouple tip, air vs vacuum

Citation

McClelland, J. , Strelcov, E. and Chand, A. (2025), Signal size and resolution of scanning thermal microscopy in air and vacuum, Nature - Scientific Reports, [online], https://doi.org/10.1038/s41598-025-95648-w, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=959087 (Accessed October 13, 2025)