This paper reports that the thermochromic vanadium dioxide films were deposited on various transparent substrates by radio frequency magnetron sputtering, and then aged under circumstance for years. Samples were chara...This paper reports that the thermochromic vanadium dioxide films were deposited on various transparent substrates by radio frequency magnetron sputtering, and then aged under circumstance for years. Samples were characterized with several different techniques such as x-ray diffraction, x-ray photoelectron spectroscopy, and Raman, when they were fresh from sputter chamber and aged after years, respectively, in order to determine their structure and composition. It finds that a small amount of sodium occurred on the surface of vanadium dioxide films, which was probably due to sodium ion diffusion from soda-lime glass when sputtering was performed at high substrate temperature. It also finds that aging for years significantly affected the nonstoichiometry of vanadium dioxide films, thus inducing much change in Raman modes.展开更多
A double-potential-well model is proposed to describe the core-shell thickness-dependent photoluminescence peaks and energy relaxations in semiconductor quantum dots (QDs). The surface effect plays an important role i...A double-potential-well model is proposed to describe the core-shell thickness-dependent photoluminescence peaks and energy relaxations in semiconductor quantum dots (QDs). The surface effect plays an important role in the formation of new states-polaronic states around the surface of QDs. The polaronic states formed emit light due to the strong interaction between the core state (confined state) and the surface state with an enhanced participation of the size effect.展开更多
A fast melting release method for the free-fall equivalence principle test using laser interferometry is discussed.The primary experiment result shows that the uncertainty of the differential release time could be con...A fast melting release method for the free-fall equivalence principle test using laser interferometry is discussed.The primary experiment result shows that the uncertainty of the differential release time could be controlled at the level of 1ms by this release system,which satisfies the requirement of the expected experimental precision.展开更多
基金supported by the National Natural Science Foundation of China (Grant No 60776039)China Agricultural University Foundation (Grant No 2007037)
文摘This paper reports that the thermochromic vanadium dioxide films were deposited on various transparent substrates by radio frequency magnetron sputtering, and then aged under circumstance for years. Samples were characterized with several different techniques such as x-ray diffraction, x-ray photoelectron spectroscopy, and Raman, when they were fresh from sputter chamber and aged after years, respectively, in order to determine their structure and composition. It finds that a small amount of sodium occurred on the surface of vanadium dioxide films, which was probably due to sodium ion diffusion from soda-lime glass when sputtering was performed at high substrate temperature. It also finds that aging for years significantly affected the nonstoichiometry of vanadium dioxide films, thus inducing much change in Raman modes.
基金Supported by the Bairen Project of the Chinese Academy of Sciences.
文摘A double-potential-well model is proposed to describe the core-shell thickness-dependent photoluminescence peaks and energy relaxations in semiconductor quantum dots (QDs). The surface effect plays an important role in the formation of new states-polaronic states around the surface of QDs. The polaronic states formed emit light due to the strong interaction between the core state (confined state) and the surface state with an enhanced participation of the size effect.
基金Supported by the Ministry of Science and Technology of China under Grant No.95-Yu-34the National Natural Science Foundation of China under Grant No.19835040.
文摘A fast melting release method for the free-fall equivalence principle test using laser interferometry is discussed.The primary experiment result shows that the uncertainty of the differential release time could be controlled at the level of 1ms by this release system,which satisfies the requirement of the expected experimental precision.
