In situ atomic force microscopy observation of hydrogen absorption/desorption by Palladium thin film

Itoko Matsumoto, Kouji Sakaki, Yumiko Nakamura, Etsuo Akiba

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Grain structure changes in Pd thin film during hydrogen absorption and desorption were observed by in situ atomic force microscopy. The as-sputtered film had a smooth flat surface with 20-30 nm grains. Film that absorbed hydrogen showed buckling, caused by the compressive stress due to lattice expansion as Pd metal reacted with hydrogen to form the hydride. Grains on the buckles were agglomerated and deformed unlike those on flat areas beside the buckles. Film that absorbed and then desorbed hydrogen still showed some buckling; however, many buckles shrank and flattened when the compressive stress of lattice expansion was released during desorption. On both the remaining and the shrunken buckles, grain agglomeration was retained; whereas, the deformed grains reverted back to their original form. X-ray diffraction indicated compressive residual stress in the as-sputtered film and tensile residual stress in the film after hydrogen absorption/desorption. These results indicate that irreversible grain agglomeration is related to residual tensile stress in the film although agglomeration occurs only on the buckled areas.

Original languageEnglish
Pages (from-to)1456-1459
Number of pages4
JournalApplied Surface Science
Volume258
Issue number4
DOIs
Publication statusPublished - Dec 1 2011

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Palladium
Hydrogen
Atomic force microscopy
Desorption
Thin films
Compressive stress
Residual stresses
Agglomeration
Tensile stress
Buckling
Crystal microstructure
Hydrides
Metals
X ray diffraction

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

In situ atomic force microscopy observation of hydrogen absorption/desorption by Palladium thin film. / Matsumoto, Itoko; Sakaki, Kouji; Nakamura, Yumiko; Akiba, Etsuo.

In: Applied Surface Science, Vol. 258, No. 4, 01.12.2011, p. 1456-1459.

Research output: Contribution to journalArticle

Matsumoto, Itoko ; Sakaki, Kouji ; Nakamura, Yumiko ; Akiba, Etsuo. / In situ atomic force microscopy observation of hydrogen absorption/desorption by Palladium thin film. In: Applied Surface Science. 2011 ; Vol. 258, No. 4. pp. 1456-1459.
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