A nearly free sustained copper （Cu） film system has been successfully fabricated by thermal evaporation deposition of Cu atoms on silicone oil surfaces, and a characteristic ordered pattern has been systematically s...A nearly free sustained copper （Cu） film system has been successfully fabricated by thermal evaporation deposition of Cu atoms on silicone oil surfaces, and a characteristic ordered pattern has been systematically studied. The ordered pattern, namely, band, is composed of a large number of parallel key-formed domains with different width w but nearly uniform length L; its characteristic values of w and L are very susceptible to the growth period, deposition rate and nominal film thickness. The formation mechanism of the ordered patterns is well explained in terms of the relaxation of the internal stress in the films, which is related to the nearly zero adhesion of the solid-liquid interface. By using a two-time deposition method, it is confirmed that the ordered patterns really form in the vacuum chamber.展开更多
Several metal (such as aluminum, iron etc.) film systems deposited on liquid (silicone oil) substrates have been successfully fabricated by a thermal evaporation method, and the special me- chanical properties and com...Several metal (such as aluminum, iron etc.) film systems deposited on liquid (silicone oil) substrates have been successfully fabricated by a thermal evaporation method, and the special me- chanical properties and complex ordered surface structures have been systematically studied. The experimental results show that there exists a com- pressive stress gradient in these films, making cracks nucleate at the film edges and then extend to the central regions gradually. Because the interaction between solid films and liquid substrates in the tan- gent direction is very small, the metal films can mo- tion freely on the oil surfaces as a whole. In order to release the compressive stress, the broken film pieces collide, crush and superpose each other, which finally results in the formation of ordered band- shaped structures with an anti-symmetric character- istic. Based on the special mechanical properties of these nearly free sustained films, the morphologies and growth behaviors of the ordered structures are analyzed and discussed in detail.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No 10574109)the Zhejiang Provincial Science and Technology Department (Grant No 2005C24008)the Zhejiang Provincial Natural Science Foundation (Grant No.Y604064)
文摘A nearly free sustained copper （Cu） film system has been successfully fabricated by thermal evaporation deposition of Cu atoms on silicone oil surfaces, and a characteristic ordered pattern has been systematically studied. The ordered pattern, namely, band, is composed of a large number of parallel key-formed domains with different width w but nearly uniform length L; its characteristic values of w and L are very susceptible to the growth period, deposition rate and nominal film thickness. The formation mechanism of the ordered patterns is well explained in terms of the relaxation of the internal stress in the films, which is related to the nearly zero adhesion of the solid-liquid interface. By using a two-time deposition method, it is confirmed that the ordered patterns really form in the vacuum chamber.
基金This work was supported by the National Natural Science Foundation of China （Grant No. 211571067） the Foundation of Zhejiang Pruvincital Education Department in China （Grant No.20040373）.
文摘Several metal (such as aluminum, iron etc.) film systems deposited on liquid (silicone oil) substrates have been successfully fabricated by a thermal evaporation method, and the special me- chanical properties and complex ordered surface structures have been systematically studied. The experimental results show that there exists a com- pressive stress gradient in these films, making cracks nucleate at the film edges and then extend to the central regions gradually. Because the interaction between solid films and liquid substrates in the tan- gent direction is very small, the metal films can mo- tion freely on the oil surfaces as a whole. In order to release the compressive stress, the broken film pieces collide, crush and superpose each other, which finally results in the formation of ordered band- shaped structures with an anti-symmetric character- istic. Based on the special mechanical properties of these nearly free sustained films, the morphologies and growth behaviors of the ordered structures are analyzed and discussed in detail.
