The synthesis of diamond single crystal in the Fe64Ni36-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300-1400℃. The color of the obtained diamond crystals translates from ...The synthesis of diamond single crystal in the Fe64Ni36-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300-1400℃. The color of the obtained diamond crystals translates from yellow to dark green with increasing the h-BN addition. Fourier-transform infrared （FTIR） results indicate that sp2 hybridization B-N-B and B-N structures generate when the additive content reaches a certain value in the system. The two peaks are located at 745 and 1425cm-1, respectively. Fhrthermore, the FTIR characteristic peak resulting from nitrogen pairs is noticed and it tends to vanish when the h-BN addition reaches 1.1 wt%. Furthermore, Raman peak of the synthesized diamond shifts down to a lower wavenumber with increasing the h-BN ~ddition content in the synthesis system.展开更多
Carbon nanoparticles（C-dots） were prepared by refluxing the combustion soots of candles and corn stalk in nitric acid.The synthesized C-dots were characterized.The results showed a sharp increase in oxygen content a...Carbon nanoparticles（C-dots） were prepared by refluxing the combustion soots of candles and corn stalk in nitric acid.The synthesized C-dots were characterized.The results showed a sharp increase in oxygen content and a sharp decrease in carbon content after oxidation.The C-dots had-OH and-CO2H groups introduced which made them hydrophilic.However,their difference was also obvious.The C-dots from candle soot had a 10-45 nm broad particle size distribution,and those from corn stalk soot had a 6-18 nm relatively small and narrow size distribution.The C-dots were mainly of sp2 and sp3 carbon structure different from the C-dots of diamond-like structure from candle soot.Interestingly,two kinds of C-dots all exhibited unique photoluminescent properties.The obtained C-dots have potential applications in a broad range of areas.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No 51172089the Natural Science Foundation of Guizhou Province Education Department under Grant No KY[2013]183the Natural Science Foundation of Guizhou Province Science and Technology Agency under Grant Nos LH[2015]7232 and LH[2015]7228
文摘The synthesis of diamond single crystal in the Fe64Ni36-C system with h-BN additive is investigated at pressure 6.5 GPa and temperature range of 1300-1400℃. The color of the obtained diamond crystals translates from yellow to dark green with increasing the h-BN addition. Fourier-transform infrared （FTIR） results indicate that sp2 hybridization B-N-B and B-N structures generate when the additive content reaches a certain value in the system. The two peaks are located at 745 and 1425cm-1, respectively. Fhrthermore, the FTIR characteristic peak resulting from nitrogen pairs is noticed and it tends to vanish when the h-BN addition reaches 1.1 wt%. Furthermore, Raman peak of the synthesized diamond shifts down to a lower wavenumber with increasing the h-BN ~ddition content in the synthesis system.
基金Funded by the National Natural Science Foundation of China(Nos.21465019 and 21266023)the Ningxia Natural Science Founds(NZ13011)+2 种基金the Research Project for Science and Technology of Higher Education of Ningxia Provine of China(NGY2014011)the Science and Technology Planning Project of Jiangsu Entryexit Inspection Quarantine Bureauof China(2016KJ50)the Zhenjiang Social Development Project(SH2014021)
文摘Carbon nanoparticles（C-dots） were prepared by refluxing the combustion soots of candles and corn stalk in nitric acid.The synthesized C-dots were characterized.The results showed a sharp increase in oxygen content and a sharp decrease in carbon content after oxidation.The C-dots had-OH and-CO2H groups introduced which made them hydrophilic.However,their difference was also obvious.The C-dots from candle soot had a 10-45 nm broad particle size distribution,and those from corn stalk soot had a 6-18 nm relatively small and narrow size distribution.The C-dots were mainly of sp2 and sp3 carbon structure different from the C-dots of diamond-like structure from candle soot.Interestingly,two kinds of C-dots all exhibited unique photoluminescent properties.The obtained C-dots have potential applications in a broad range of areas.
