With major signal analytical elements situated away from the measurement environment,extended gate(EG)ion-sensitive fieldeffect transistors(ISFETs)offer prospects for whole chip circuit design and system integration o...With major signal analytical elements situated away from the measurement environment,extended gate(EG)ion-sensitive fieldeffect transistors(ISFETs)offer prospects for whole chip circuit design and system integration of chemical sensors.In this work,a highly sensitive and power-efficient ISFET was proposed based on a metal-ferroelectric-insulator gate stack with negative capacitance–induced super-steep subthreshold swing and ferroelectric memory function.Along with a remotely connected EG electrode,the architecture facilitates diverse sensing functions for future establishment of smart biochemical sensor platforms.展开更多
The two-color circularly polarized pulses scheme was proposed to generate isolated attosecond pulses in our previous work [Phys. Rev. A 87 （2013） 043406], while the polarization of the attosecond pulse was not inves...The two-color circularly polarized pulses scheme was proposed to generate isolated attosecond pulses in our previous work [Phys. Rev. A 87 （2013） 043406], while the polarization of the attosecond pulse was not investigated. We show a supplementary explanation of this scheme and present another scheme to generate linear isolated attosecond pulses by combining a circularly polarized pulse with an elliptically polarized pulse. High-order harmonic generation and quantum path control are investigated to compare these two schemes. Both schemes can obtain supercontinuum spectra plateau from about 200eV to 550eV, which belong to the water window region. It is found that the latter scheme can clearly eliminate the short quantum path and extend the harmonic plateau. A linear isolated attosecond pulse with a duration of sub-6Oas can be generated by superposing a bandwidth of 70eV.展开更多
It has been reported recently that the solids K<sub>x</sub>C<sub>60</sub> and Rb<sub>x</sub>C<sub>60</sub> （x=1→5） are conductors. If x=0 and 6, they are insulators, ...It has been reported recently that the solids K<sub>x</sub>C<sub>60</sub> and Rb<sub>x</sub>C<sub>60</sub> （x=1→5） are conductors. If x=0 and 6, they are insulators, and if x=3, they have the largest conductivities. When the temperatures go down to 18K for solid K<sub>x</sub>C<sub>60</sub> and 28K for solid Rb<sub>x</sub>C<sub>60</sub>, they are transferred into superconductors. These results are very interesting. Solids K<sub>x</sub>C<sub>60</sub> and Rb<sub>x</sub>C<sub>60</sub> are very unstable when being exposed to air, so for practical purposes, it had better be synthesized to the metal-containing fullerenes MC<sub>60</sub> in which the metal atom M is at the center of C<sub>60</sub>. It has been known for some years展开更多
C_(60) and C_(70) single crystals free from solvent contamination grew from their vapour. Large C_(60) crystals up to a size of about 5 mm × 3 mm × 3 mm and C_(70) crystals about 1 mm × 1 mm × ...C_(60) and C_(70) single crystals free from solvent contamination grew from their vapour. Large C_(60) crystals up to a size of about 5 mm × 3 mm × 3 mm and C_(70) crystals about 1 mm × 1 mm × 1 mm were obtained. C_(60) crystals with fee structure showed two types of morphological faces, namely {111} and {100 },frequently with twinning on {111} face. C_(70) crystals obtained have a hop structure with a = 10. 1 andc=16. 7 DSC and X-ray diffraction analysis indicated that C(70) crystal underwent phase transition below 100 ℃ Morphological observation suggests that the growth of C(60) and C(70) single crystals is based on layer spreading mechanism.展开更多
The spectra of Cm and Cm thin films over a wide energy range (0.6 to 6.5eV) are measured by transmission spectroscopy and photothermal deflection spectroscopy (PDS), and the optical absorption coefficients are obtaine...The spectra of Cm and Cm thin films over a wide energy range (0.6 to 6.5eV) are measured by transmission spectroscopy and photothermal deflection spectroscopy (PDS), and the optical absorption coefficients are obtained. The optical transitions for the Cm and Cw thin films are analyzed according to the molecular orbital model. The weak absorption spectra of the fullerenes are similar to that of amorphous silicon. The optical energy gaps are given by Tauc’s plots as 1.75 and 1.65eV for C60 and C70 thin films, respectively. The disorders in the fullerene films, which resulted in band-tail state or defect state, are indicated by Urbach edge and sub-gap absorption. It is the disorder that brought the difficulty in determination of the energy gap for fullerenes. The effects of the deflection medium and substrate on the weak absorption spectra of fullerene films are also discussed.展开更多
K3C60 single crystal film was prepared on the cleaved (111) surface of C60 single crystal. Synchrotron radiation angle-resolved photoemission spectra were measured at normal emission with sample temperature at - 150K....K3C60 single crystal film was prepared on the cleaved (111) surface of C60 single crystal. Synchrotron radiation angle-resolved photoemission spectra were measured at normal emission with sample temperature at - 150K. Up to four subpeaks of LUMO-derived band were observed. These sub-peaks exhibit distinct energy dispersions which resemble in general the theoretical ones calculated for K3C60 at low temperature with the so-called one-dimensional disordered structure. But there is large deviation of experimental sub-band intervals from the theoretical values. This result is meaningful for the studies of the physical properties of alkali-doped C60 solids, e.g. the mechanism for superconductivity.展开更多
Alkali metal fullerides (A<sub>n</sub>C<sub>60</sub>) are versatile reagents in synthetic chemistry ofbuckminsterfullerene, for example, controlled chemical functionalizations of buckminster-fu...Alkali metal fullerides (A<sub>n</sub>C<sub>60</sub>) are versatile reagents in synthetic chemistry ofbuckminsterfullerene, for example, controlled chemical functionalizations of buckminster-fullerene might be achieved by using precursors C<sub>60</sub><sup>n-</sup>M in a desired oxidation state.Vapor-transport technique was widely used to investigate the electron-transfer reactionsbetween C<sub>60</sub> and alkali metal. This method, however, required higher temperature condi-tions （200—400℃） and a longer period of reaction time （10—15 d）. Direct reactions of C<sub>60</sub>展开更多
基金the National Natural Science Foundation of China No.52073160the National Key Research and Development Program of China No.2020YFF01014706+1 种基金Beijing Municipal Science and Technology Commission(Z211100002421012)Key Laboratory of Advanced Materials(MOE).
文摘With major signal analytical elements situated away from the measurement environment,extended gate(EG)ion-sensitive fieldeffect transistors(ISFETs)offer prospects for whole chip circuit design and system integration of chemical sensors.In this work,a highly sensitive and power-efficient ISFET was proposed based on a metal-ferroelectric-insulator gate stack with negative capacitance–induced super-steep subthreshold swing and ferroelectric memory function.Along with a remotely connected EG electrode,the architecture facilitates diverse sensing functions for future establishment of smart biochemical sensor platforms.
基金Supported by the National Natural Science Foundation of China under Grant Nos 11404204 and 11447208the Key Project of Chinese Ministry of Education under Grant No 211025+1 种基金the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20111404120004the Natural Science Foundation for Young Scientists of Shanxi Province under Grant No 2009021005
文摘The two-color circularly polarized pulses scheme was proposed to generate isolated attosecond pulses in our previous work [Phys. Rev. A 87 （2013） 043406], while the polarization of the attosecond pulse was not investigated. We show a supplementary explanation of this scheme and present another scheme to generate linear isolated attosecond pulses by combining a circularly polarized pulse with an elliptically polarized pulse. High-order harmonic generation and quantum path control are investigated to compare these two schemes. Both schemes can obtain supercontinuum spectra plateau from about 200eV to 550eV, which belong to the water window region. It is found that the latter scheme can clearly eliminate the short quantum path and extend the harmonic plateau. A linear isolated attosecond pulse with a duration of sub-6Oas can be generated by superposing a bandwidth of 70eV.
基金ProJect supported by the National Natural Science Foundation of China
文摘It has been reported recently that the solids K<sub>x</sub>C<sub>60</sub> and Rb<sub>x</sub>C<sub>60</sub> （x=1→5） are conductors. If x=0 and 6, they are insulators, and if x=3, they have the largest conductivities. When the temperatures go down to 18K for solid K<sub>x</sub>C<sub>60</sub> and 28K for solid Rb<sub>x</sub>C<sub>60</sub>, they are transferred into superconductors. These results are very interesting. Solids K<sub>x</sub>C<sub>60</sub> and Rb<sub>x</sub>C<sub>60</sub> are very unstable when being exposed to air, so for practical purposes, it had better be synthesized to the metal-containing fullerenes MC<sub>60</sub> in which the metal atom M is at the center of C<sub>60</sub>. It has been known for some years
文摘C_(60) and C_(70) single crystals free from solvent contamination grew from their vapour. Large C_(60) crystals up to a size of about 5 mm × 3 mm × 3 mm and C_(70) crystals about 1 mm × 1 mm × 1 mm were obtained. C_(60) crystals with fee structure showed two types of morphological faces, namely {111} and {100 },frequently with twinning on {111} face. C_(70) crystals obtained have a hop structure with a = 10. 1 andc=16. 7 DSC and X-ray diffraction analysis indicated that C(70) crystal underwent phase transition below 100 ℃ Morphological observation suggests that the growth of C(60) and C(70) single crystals is based on layer spreading mechanism.
基金Project supported by the National Natural Science Foundation of China.
文摘The spectra of Cm and Cm thin films over a wide energy range (0.6 to 6.5eV) are measured by transmission spectroscopy and photothermal deflection spectroscopy (PDS), and the optical absorption coefficients are obtained. The optical transitions for the Cm and Cw thin films are analyzed according to the molecular orbital model. The weak absorption spectra of the fullerenes are similar to that of amorphous silicon. The optical energy gaps are given by Tauc’s plots as 1.75 and 1.65eV for C60 and C70 thin films, respectively. The disorders in the fullerene films, which resulted in band-tail state or defect state, are indicated by Urbach edge and sub-gap absorption. It is the disorder that brought the difficulty in determination of the energy gap for fullerenes. The effects of the deflection medium and substrate on the weak absorption spectra of fullerene films are also discussed.
文摘K3C60 single crystal film was prepared on the cleaved (111) surface of C60 single crystal. Synchrotron radiation angle-resolved photoemission spectra were measured at normal emission with sample temperature at - 150K. Up to four subpeaks of LUMO-derived band were observed. These sub-peaks exhibit distinct energy dispersions which resemble in general the theoretical ones calculated for K3C60 at low temperature with the so-called one-dimensional disordered structure. But there is large deviation of experimental sub-band intervals from the theoretical values. This result is meaningful for the studies of the physical properties of alkali-doped C60 solids, e.g. the mechanism for superconductivity.
基金Project supported by the National Natural Science Foundation of China and Science Foundation of Shanghai Committee of Science and Technology.
文摘Alkali metal fullerides (A<sub>n</sub>C<sub>60</sub>) are versatile reagents in synthetic chemistry ofbuckminsterfullerene, for example, controlled chemical functionalizations of buckminster-fullerene might be achieved by using precursors C<sub>60</sub><sup>n-</sup>M in a desired oxidation state.Vapor-transport technique was widely used to investigate the electron-transfer reactionsbetween C<sub>60</sub> and alkali metal. This method, however, required higher temperature condi-tions （200—400℃） and a longer period of reaction time （10—15 d）. Direct reactions of C<sub>60</sub>
