The electron spin resonance(ESR)of purified carbon nanotubes prepared under different helium pressures from 20.0 to 80.0kPa in arc discharge has been measured.The dependence of the ESR spin density,linewidth and g val...The electron spin resonance(ESR)of purified carbon nanotubes prepared under different helium pressures from 20.0 to 80.0kPa in arc discharge has been measured.The dependence of the ESR spin density,linewidth and g value of the purified nanotubes on the helium pressure is found.The electronic properties of purified nanotubes varying with He pressure are discussed.展开更多
Stable cold-cathode electron emission at fields as low as 3 MV/m has been observed from two types of carbon-containing thin film of thickness in submicron scale,i.e.,non-doped fullerene C60 and amorphous diamond films...Stable cold-cathode electron emission at fields as low as 3 MV/m has been observed from two types of carbon-containing thin film of thickness in submicron scale,i.e.,non-doped fullerene C60 and amorphous diamond films.A transparent anode imaging technique was used to record the spatial distribution of individual sites and the total emission current-voltage characteristic of the films.It is found that supplemental measurements of optical spectra and electrical conductivity of the films can provide important evidence useful for understanding the differences in emission behaviour between two types of film.展开更多
基金Supported by Guangdong Provincial Natural Science Foundation of China(No.960029)the Foundation of Key Scientific Researches by the Higher Education Bureau of Guangdong Province(No.950011).
文摘The electron spin resonance(ESR)of purified carbon nanotubes prepared under different helium pressures from 20.0 to 80.0kPa in arc discharge has been measured.The dependence of the ESR spin density,linewidth and g value of the purified nanotubes on the helium pressure is found.The electronic properties of purified nanotubes varying with He pressure are discussed.
基金Supported by the National Natural Science Foundation for Outstanding Youth of China under Grant No.59525206,a special grant from the Foundation of Key Disciplines of the Higher Education Bureau ofGuangdong Province.
文摘Stable cold-cathode electron emission at fields as low as 3 MV/m has been observed from two types of carbon-containing thin film of thickness in submicron scale,i.e.,non-doped fullerene C60 and amorphous diamond films.A transparent anode imaging technique was used to record the spatial distribution of individual sites and the total emission current-voltage characteristic of the films.It is found that supplemental measurements of optical spectra and electrical conductivity of the films can provide important evidence useful for understanding the differences in emission behaviour between two types of film.
