采用分子动力学方法模拟了碳在晶体硅基底上的沉积过程,并分析计算了所沉积的类金刚石薄膜的面向及法向热导率.对沉积过程的模拟表明,薄膜密度及sp^3杂化类型的碳原子所占比例均随沉积高度的增加而减小,在碳原子以1 e V能量垂直入射的...采用分子动力学方法模拟了碳在晶体硅基底上的沉积过程,并分析计算了所沉积的类金刚石薄膜的面向及法向热导率.对沉积过程的模拟表明,薄膜密度及sp^3杂化类型的碳原子所占比例均随沉积高度的增加而减小,在碳原子以1 e V能量垂直入射的情况下,在硅基底上沉积的薄膜密度约为2.8 g/cm^3,sp^3杂化类型的碳原子所占比例约为22%,均低于碳在金刚石基底上沉积的情况.采用Green-Kubo方法,计算了所沉积类金刚石薄膜的热导率,其面向热导率可以达到相同尺寸规则金刚石晶体的50%左右,并且随着薄膜密度与sp^3杂化类型碳原子所占比例的升高而升高.展开更多
The hydrogenated diamond like carbon(DLC) films were formed on conductive glass substrate by deposition in DMF using a pulse modulated source. The X ray photoelectron spectroscopy results of the films showed that the ...The hydrogenated diamond like carbon(DLC) films were formed on conductive glass substrate by deposition in DMF using a pulse modulated source. The X ray photoelectron spectroscopy results of the films showed that the main composition of the films are carbon. The Raman and IR spectra indicated the existence of hydrogen in form of sp 3 C in the film. From the Raman spectra indicated the formation of DLC in most regions of the film and also possible diamond deposits. The films showed high transmission ratio (>70%) in 330～2000 nm and electrical resistivity of 10 10 Ω·cm.展开更多
Thin films of titanium carbide and amorphous hydrogenated carbon have been synthesized on titanium aluminium alloy substrates by PSII assisted MW-ECRCVD with a mirror field. The microstructure, chemical composition an...Thin films of titanium carbide and amorphous hydrogenated carbon have been synthesized on titanium aluminium alloy substrates by PSII assisted MW-ECRCVD with a mirror field. The microstructure, chemical composition and mechanical property were investigated. Using XPS and TEM, the films were identified to be a-C：H film containing TiC nanometre grains （namely, the so-called nanocomposite structure）. The size of TiC grains of nanocomposite TiC/DLC film is about 5 nm. The nanocomposite structure has obvious improvement in the mechanical properties of DLC film. The hardness of a-C：H film with Ti is enhanced to 34 G Pa~ while that of a-C：H film without Ti is about 12 G Pa, and the coherent strength is also obviously enhanced at the critical load of about 35N.展开更多
文摘采用分子动力学方法模拟了碳在晶体硅基底上的沉积过程,并分析计算了所沉积的类金刚石薄膜的面向及法向热导率.对沉积过程的模拟表明,薄膜密度及sp^3杂化类型的碳原子所占比例均随沉积高度的增加而减小,在碳原子以1 e V能量垂直入射的情况下,在硅基底上沉积的薄膜密度约为2.8 g/cm^3,sp^3杂化类型的碳原子所占比例约为22%,均低于碳在金刚石基底上沉积的情况.采用Green-Kubo方法,计算了所沉积类金刚石薄膜的热导率,其面向热导率可以达到相同尺寸规则金刚石晶体的50%左右,并且随着薄膜密度与sp^3杂化类型碳原子所占比例的升高而升高.
文摘The hydrogenated diamond like carbon(DLC) films were formed on conductive glass substrate by deposition in DMF using a pulse modulated source. The X ray photoelectron spectroscopy results of the films showed that the main composition of the films are carbon. The Raman and IR spectra indicated the existence of hydrogen in form of sp 3 C in the film. From the Raman spectra indicated the formation of DLC in most regions of the film and also possible diamond deposits. The films showed high transmission ratio (>70%) in 330～2000 nm and electrical resistivity of 10 10 Ω·cm.
文摘Thin films of titanium carbide and amorphous hydrogenated carbon have been synthesized on titanium aluminium alloy substrates by PSII assisted MW-ECRCVD with a mirror field. The microstructure, chemical composition and mechanical property were investigated. Using XPS and TEM, the films were identified to be a-C：H film containing TiC nanometre grains （namely, the so-called nanocomposite structure）. The size of TiC grains of nanocomposite TiC/DLC film is about 5 nm. The nanocomposite structure has obvious improvement in the mechanical properties of DLC film. The hardness of a-C：H film with Ti is enhanced to 34 G Pa~ while that of a-C：H film without Ti is about 12 G Pa, and the coherent strength is also obviously enhanced at the critical load of about 35N.
