Morphological and spectroscopic studies on enlargement of Pd nanoparticle in L-cysteine aqueous solution by AFM and XPS

作者：Tsukada C^*; Ogawa S; Niwa H; Nomoto T; Kutluk G; Namatame H; Taniguchi M; Yagi S

来源：Applied Surface Science, 2013, 267: 48-52.

DOI：10.1016/j.apsusc.2012.05.123

• Pd nanoparticle
• SiO2/Si
• L-Cysteine
• Enlargement
• Migration
• XPS

We have revealed the enlargement mechanism of Pd nanoparticles (NPs) on SiO2/Si by the AFM observation and the XPS measurement, when the Pd NPs react with the L-cysteine under water environment. Furthermore, the adsorbates on the Pd NPs/SiO2/Si have been confirmed by the XPS measurement. The Pd NPs with clean surface are fabricated and deposited on the SiO2/Si substrate by the gas evaporation method. In that aspect, the Pd NPs possess an interaction with the SiO2/Si surface. When the Pd NPs/SiO2/Si is reacted into the L-cysteine aqueous solution, the adsorbates originated from the L-cysteine exist on the Pd NPs surface. On the contrary, the L-cysteine hardly adsorb on the SiO2/Si. The enlargement of the Pd NPs is stimulated by the contributions of the H2O and/or the L-cysteine molecules because the Pd NPs can be more easily migrated on the SiO2/Si surface due to those contributions.

• 出版日期2013-2-15