Mechanical characterization of pristine and hydrogen-exposed palladium nanowires by in situ TEM

Changes in the crystal lattice of palladium nanowires (Pd NWs) upon hydrogen exposure by absorption and interstitial introduction of hydrogen atoms within the matrix can induce swelling of the nanostructure and generate dislocations through the solid that may alter the overall mechanical performance...

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Bibliographic Details
Published in:Nanotechnology 2013-01, Vol.24 (3), p.035701-035701
Main Authors: Carpena-Núñez, Jennifer, Yang, Dachi, Kim, Jae-Woo, Park, Cheol, Fonseca, Luis F
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Dislocations
Exact sciences and technology
Hydrogen embrittlement
Hydrogen storage
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Materials science
Mechanical and acoustical properties of condensed matter
Mechanical properties of nanoscale materials
Nanoscale materials and structures: fabrication and characterization
Nanostructure
Nanowires
Palladium
Physics
Plastic deformation
Quantum wires
Sensing devices
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:Changes in the crystal lattice of palladium nanowires (Pd NWs) upon hydrogen exposure by absorption and interstitial introduction of hydrogen atoms within the matrix can induce swelling of the nanostructure and generate dislocations through the solid that may alter the overall mechanical performance of the material. Understanding the mechanical behavior of Pd NW-based hydrogen sensors may provide crucial information regarding material changes where the integrity of the sensing device can be compromised. The plastic behavior of hydrogen sensing Pd NWs was studied prior to-and subsequently to-hydrogen exposure via in situ transmission electron microscope-atomic force microscope (TEM-AFM) experiments to understand the role of hydrogenation in the NWs mechanical performance simultaneous to real-time observation. Quantitative and qualitative analysis was performed for deformed NWs upon compression and tension. Large plastic deformation was observed for pristine Pd NWs whereas little plastic deformation was observed for hydrogen-exposed Pd NWs. Tested pristine NWs behaved in a ductile manner, and necking events were observed for all tested specimens upon tension. Lowered ductility was observed for the hydrogen-exposed specimen, in accordance with hydrogen embrittlement observed in bulk palladium.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/24/3/035701