TY - GEN
T1 - In situ HREM study on sublimation-induced phase change in nanometer-sized gold and silver particles
AU - Lee, Jung Goo
AU - Chien, Chunrin
AU - Choi, Chul Jin
AU - Mori, Hirotaro
PY - 2010/9/10
Y1 - 2010/9/10
N2 - The Phase stabilities of nanometer-sized materials are quite different from those of the corresponding bulk materials. Among the phase stabilities, melting point suppression is one of the most fundamentally important issues. Until now, the melting point suppression was studied with nanoparticles supported by solid substrates. However, the substrate effect on melting point of the nanoparticles has not been taken into consideration. In this work, real-time, atomic-scale direct observation of melting point suppression in nanometer-sized gold and silver particles on graphite substrate, along with simple size reduction, was conducted by in-situ high resolution electron microscopy. Namely, it was confirmed that a crystalline-to-liquid transition occurred when the size of gold particle, being placed on graphite substrate maintained at 1100 K, decreased down to 5 nm during diminution. However, no crystalline-to-liquid transition, only a crystalline-to-gas transition, took place in graphite-supported silver nanoparticles prior to the complete disappearance of the particles.
AB - The Phase stabilities of nanometer-sized materials are quite different from those of the corresponding bulk materials. Among the phase stabilities, melting point suppression is one of the most fundamentally important issues. Until now, the melting point suppression was studied with nanoparticles supported by solid substrates. However, the substrate effect on melting point of the nanoparticles has not been taken into consideration. In this work, real-time, atomic-scale direct observation of melting point suppression in nanometer-sized gold and silver particles on graphite substrate, along with simple size reduction, was conducted by in-situ high resolution electron microscopy. Namely, it was confirmed that a crystalline-to-liquid transition occurred when the size of gold particle, being placed on graphite substrate maintained at 1100 K, decreased down to 5 nm during diminution. However, no crystalline-to-liquid transition, only a crystalline-to-gas transition, took place in graphite-supported silver nanoparticles prior to the complete disappearance of the particles.
KW - Gold
KW - In-situ TEM
KW - Nanoparticles
KW - Silver
KW - Sublimation
UR - http://www.scopus.com/inward/record.url?scp=77956309491&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77956309491&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:77956309491
SN - 9781880653777
T3 - Proceedings of the International Offshore and Polar Engineering Conference
SP - 530
EP - 533
BT - Proceedings of the 20th (2010) International Offshore and Polar Engineering Conference, ISOPE-2010
T2 - 20th International Offshore and Polar Engineering Conference, ISOPE-2010
Y2 - 20 June 2010 through 25 June 2010
ER -