Nanocarbon as an eco-friendly and abundant material has strong multi-color fluorescence, which makes it a promising candidate for healthy lighting and display. However, the low fluorescence efficiency and poor stabili...Nanocarbon as an eco-friendly and abundant material has strong multi-color fluorescence, which makes it a promising candidate for healthy lighting and display. However, the low fluorescence efficiency and poor stability of multi-color carbon nanoparticle（CNP） phosphors are main hurdles that hinder their applications. This work demonstrated efficient and stable multi-color CNP phosphors through synergy between inner polar groups and outer silica matrix. The polar groups in polyethylene glycol（PEG） 6,000 are favor of high fluorescence of the CNP phosphors, and the low melting point（64℃） of PEG 6,000 helps to improve the thermal stability of the phosphors, while the silica matrix provides protection to the phosphors. Based on this design,blue, green, yellow and red CNP phosphors with photoluminescence quantum yield of 53.1%, 47.4%, 43.8% and 42.3% have been achieved, all of which are the best values in ever reported multi-color CNP phosphors. Furthermore, the fluorescence of the CNP phosphors keeps almost unchanged at 100℃ and degrades little in one month, indicating their good thermal tolerance and temporal stability. In addition, multicolor devices including white light-emitting devices（LEDs）have been realized by coating the CNP phosphors onto UV chips. The luminous efficiency, correlated color temperature,Commission Internationale de L＇Eclairage and color rendering index of the white LED can reach 12 lm W^-1, 6,107 K,（0.32, 0.33） and 89, respectively, indicating the potential applications of the CNP phosphors in lighting and display.展开更多
Biofunctional europium（Ⅲ）-doped ZnS（ZnS：Eu） nanocrystals are prepared by a sol–gel method. The characteristic luminescence of ZnS：Eu is used as a probe signal to realize sensitive immunoassay. The luminescence...Biofunctional europium（Ⅲ）-doped ZnS（ZnS：Eu） nanocrystals are prepared by a sol–gel method. The characteristic luminescence of ZnS：Eu is used as a probe signal to realize sensitive immunoassay. The luminescence intensity of the Eu^（3＋） in the ZnS matrix shows strong concentration dependence, and the optimal doping concentration is 4%. However,the emission wavelengths of the ZnS：Eu nanocrystals are not dependent on doping concentration nor the temperature（from 100 K to 300 K）. Our results show that these features allow for reliable immunoassay. Human immunoglobulin, used as a target analyte, is captured by antibody modified ZnS：Eu probe and is finally enriched on gold substrate for detection.High specificity of the assay is demonstrated by control experiments. The linear detection range is 10 nM –800 nM, and the detection limit is about 9.6 nM.展开更多
It is highly desired to improve the photoelectric property of nanosized BiOBr by promoting the photogenerated charge transfer and separation. Herein, SnO2 and Ag comodified BiOBr nanocomposites(Ag-SO-BOB) have been pr...It is highly desired to improve the photoelectric property of nanosized BiOBr by promoting the photogenerated charge transfer and separation. Herein, SnO2 and Ag comodified BiOBr nanocomposites(Ag-SO-BOB) have been prepared through a simple one-pot hydrothermal method.Surface photovoltage response of BiOBr nanoplates has 4.1-time enhancement after being modified with SnO2 nanoparticles. Transient-state surface photovoltage(TS-SPV) and the atmosphere-controlled steady-state surface photovoltage spectroscopy(AC-SPS) confirmed that this exceptional enhancement of the photovoltage response can be ascribed to the coupled SnO2 acting as platform for accepting the photoelectrons from BiOBr so as to prolong the lifetime and enhance charge separation. Remarkably, the surface photovoltage response can be further enhanced by synchronously introducing Ag nanoparticles, which is up to 15.4-times enhancement compared with bulk BiOBr nanoplates. The enhancement can be attributed to the improved O2 adsorption by introducing Ag to further enhance charge separation. Finally, the synergistic effect of SnO2 and Ag co-modification enhances the surface photovoltage response due to the enhanced charge separation and promoted O2 adsorption, which is also confirmed through photoelectrochemistry and photocatalytic experiment.展开更多
基金supported by the National Natural Science Foundation of China (21601159, 61604132, 61505033, 11374296, 61404039)the National Science Fund for Distinguished Young Scholars (61425021)
文摘Nanocarbon as an eco-friendly and abundant material has strong multi-color fluorescence, which makes it a promising candidate for healthy lighting and display. However, the low fluorescence efficiency and poor stability of multi-color carbon nanoparticle（CNP） phosphors are main hurdles that hinder their applications. This work demonstrated efficient and stable multi-color CNP phosphors through synergy between inner polar groups and outer silica matrix. The polar groups in polyethylene glycol（PEG） 6,000 are favor of high fluorescence of the CNP phosphors, and the low melting point（64℃） of PEG 6,000 helps to improve the thermal stability of the phosphors, while the silica matrix provides protection to the phosphors. Based on this design,blue, green, yellow and red CNP phosphors with photoluminescence quantum yield of 53.1%, 47.4%, 43.8% and 42.3% have been achieved, all of which are the best values in ever reported multi-color CNP phosphors. Furthermore, the fluorescence of the CNP phosphors keeps almost unchanged at 100℃ and degrades little in one month, indicating their good thermal tolerance and temporal stability. In addition, multicolor devices including white light-emitting devices（LEDs）have been realized by coating the CNP phosphors onto UV chips. The luminous efficiency, correlated color temperature,Commission Internationale de L＇Eclairage and color rendering index of the white LED can reach 12 lm W^-1, 6,107 K,（0.32, 0.33） and 89, respectively, indicating the potential applications of the CNP phosphors in lighting and display.
基金Supported by Key Project of National Natural Science Foundation of China(50532050)National Natural Science Foundation of China for Youth(60506014)"973" National Basic Research Program of China(2006CB604906)~~
基金Project supported by the National Natural Science Foundation of China(Grant No.61205193)the Project of Science and Technology of Jilin Province,China(Grant No.20140520107JH)+1 种基金the Technology Foundation of Jilin Provincial Department of Human Resources and Social Security,China(Grant No.RL201306)the Science Foundation for Young Scientists of Changchun University of Science and Technology,China(Grant No.XQNJJ-2015-03)
文摘Biofunctional europium（Ⅲ）-doped ZnS（ZnS：Eu） nanocrystals are prepared by a sol–gel method. The characteristic luminescence of ZnS：Eu is used as a probe signal to realize sensitive immunoassay. The luminescence intensity of the Eu^（3＋） in the ZnS matrix shows strong concentration dependence, and the optimal doping concentration is 4%. However,the emission wavelengths of the ZnS：Eu nanocrystals are not dependent on doping concentration nor the temperature（from 100 K to 300 K）. Our results show that these features allow for reliable immunoassay. Human immunoglobulin, used as a target analyte, is captured by antibody modified ZnS：Eu probe and is finally enriched on gold substrate for detection.High specificity of the assay is demonstrated by control experiments. The linear detection range is 10 nM –800 nM, and the detection limit is about 9.6 nM.
基金financial support from the National Natural Science Foundation of China (U1401245, 21501052 and 91622119)the Program for Innovative Research Team in Chinese Universities (IRT1237)+2 种基金China Postdoctoral Science Foundation (2015M570304)the Special Funding for Postdoctoral of Heilongjiang Province (LBH-TZ06019)UNPYSCT-2016173
文摘It is highly desired to improve the photoelectric property of nanosized BiOBr by promoting the photogenerated charge transfer and separation. Herein, SnO2 and Ag comodified BiOBr nanocomposites(Ag-SO-BOB) have been prepared through a simple one-pot hydrothermal method.Surface photovoltage response of BiOBr nanoplates has 4.1-time enhancement after being modified with SnO2 nanoparticles. Transient-state surface photovoltage(TS-SPV) and the atmosphere-controlled steady-state surface photovoltage spectroscopy(AC-SPS) confirmed that this exceptional enhancement of the photovoltage response can be ascribed to the coupled SnO2 acting as platform for accepting the photoelectrons from BiOBr so as to prolong the lifetime and enhance charge separation. Remarkably, the surface photovoltage response can be further enhanced by synchronously introducing Ag nanoparticles, which is up to 15.4-times enhancement compared with bulk BiOBr nanoplates. The enhancement can be attributed to the improved O2 adsorption by introducing Ag to further enhance charge separation. Finally, the synergistic effect of SnO2 and Ag co-modification enhances the surface photovoltage response due to the enhanced charge separation and promoted O2 adsorption, which is also confirmed through photoelectrochemistry and photocatalytic experiment.
