Measurement of local crystal lattice strain variations in dealloyed nanoporous gold

作者：Mahr Christoph; Mueller-Caspary Knut; Graf Matthias; Lackmann Anastasia; Grieb Tim; Schowalter Marco; Krause Florian F.; Mehrtens Thorsten; Wittstock Arne; Weissmueller Joerg; Rosenauer Andreas

来源：Materials Research Letters, 2018, 6(1): 84-92.

DOI：10.1080/21663831.2017.1396263

• Nanoporous gold
• lattice strain
• sensor
• actuator
• nano-beam electron diffraction

Reversible macroscopic length changes in nanoporous structures can be achieved by applying electric potentials or by exposing them to different gases or liquids. Thus, these materials are interesting candidates for applications as sensors or actuators. Macroscopic length changes originate from microscopic changes of crystal lattice parameters. In this report, we show spatially resolved measurements of crystal lattice strain in dealloyed nanoporous gold. The results confirm theory by indicating a compression of the lattice along the axis of cylindrically shaped ligaments and an expansion in radial direction. Furthermore, we show that curved npAu surfaces show inward relaxation of the surface layer.
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• 出版日期2018