Observations on the melting of Au nanoparticle deposits and alloying with Ni via in situ synchrotron radiation x-ray diffraction

Tzu-Hsuan Kao; Jenn-Ming Song; In-Gann Chen; Teng-Yuan Dong; Weng-Sing Hwang; Hsin-Yi Lee
September 2009
Applied Physics Letters;9/28/2009, Vol. 95 Issue 13, p131905
Academic Journal
Through monitoring the evolution of the x-ray diffraction peaks, the transient low temperature melting of Au nanoparticles and following alloying with the substrate were demonstrated via in situ synchrotron radiation x-ray diffraction. Upon heating, the broad diffraction peak of nanosized Au particles with the average diameter of 2.5 nm was suppressed at about 200 °C and soon became sharp due to melting and subsequent solidification. If the test was conducted on a Ni film, an unstable intermetallic compound Au3Ni appeared with crystallized Au, which resulted from the reaction between the supercooled liquid of Au and Ni. However, it decomposed at 275 °C and above.


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