In recent years,emerging two-dimensional(2D)platinum diselenide(PtSe2)has quickly attracted the attention of the research community due to its novel physical and chemical properties.For the past few years,increasing r...In recent years,emerging two-dimensional(2D)platinum diselenide(PtSe2)has quickly attracted the attention of the research community due to its novel physical and chemical properties.For the past few years,increasing research achievements on 2D PtSe2 have been reported toward the fundamental science and various potential applications of PtSe2.In this review,the properties and structure characteristics of 2D PtSe2 are discussed at first.Then,the recent advances in synthesis of PtSe2 as well as their applications are reviewed.At last,potential perspectives in exploring the application of 2D PtSe2 are reviewed.展开更多
In this letter, we report a quantitative analysis of how a Pt（II） precursor is reduced to atoms at different temperatures for the formation of Pt nanocrystals with different morphologies and sizes. Our results sugge...In this letter, we report a quantitative analysis of how a Pt（II） precursor is reduced to atoms at different temperatures for the formation of Pt nanocrystals with different morphologies and sizes. Our results suggest that in the early stage of a synthesis, the Pt（II） precursor is reduced to atoms exclusively in the solution phase, followed by homogeneous nucleation to generate nuclei and then seeds. At a relatively low reaction temperature such as 22℃, the growth of the seeds is dominated by autocatalytic surface reduction that involves the adsorption and then reduction of the Pt（II） precursor on the surface of the just-formed seeds. This particular growth pathway results in relatively large assemblies of Pt nanocrystals. When the reaction temperature is increased to 100 ℃, the dominant reduction pathway will be switched from surface to solution phase, producing much smaller asselnblies of Pt nanocrystals. Our results also demonstrate that a similar trend applies to the seed-rnediated growth of Pt nanocrystals in the presence of Pd nanocubes.展开更多
Using density functional theory,we investigate the vibrational properties and polarization-resolved Raman spectra ofα-PtO_(2) and obtain the Raman tensor and angle-dependent Raman intensity of α-PtO_(2).It is found ...Using density functional theory,we investigate the vibrational properties and polarization-resolved Raman spectra ofα-PtO_(2) and obtain the Raman tensor and angle-dependent Raman intensity of α-PtO_(2).It is found that the polar plot of A_(1g)mode in parallel polarization configuration is useful in identifying the orientation of the crystal.The Raman intensity of the E_(g) mode is about five times stronger than that of the A_(1g) mode.The Raman intensity is about three times stronger when the wave vector of the incident light is in x or y direction than in z direction.Our work will help the material scientists to characterize the α-PtO_(2) and to identify its orientation by comparing the experimental spectra with our result.展开更多
基金This work is supported by the Science and Technology Innovation Commission of Shenzhen(JCYJ20190808142415003)National Natural Science Foundation of China(Grant Nos.61905161,61875138,and 61961136001)the Shenzhen Nanshan District Pilotage Team Program(LHTD20170006).
文摘In recent years,emerging two-dimensional(2D)platinum diselenide(PtSe2)has quickly attracted the attention of the research community due to its novel physical and chemical properties.For the past few years,increasing research achievements on 2D PtSe2 have been reported toward the fundamental science and various potential applications of PtSe2.In this review,the properties and structure characteristics of 2D PtSe2 are discussed at first.Then,the recent advances in synthesis of PtSe2 as well as their applications are reviewed.At last,potential perspectives in exploring the application of 2D PtSe2 are reviewed.
基金supported in part by a grant from National Science Foundation of the United States(DMR-1505441)startup funds from the Georgia Institute of Technology
文摘In this letter, we report a quantitative analysis of how a Pt（II） precursor is reduced to atoms at different temperatures for the formation of Pt nanocrystals with different morphologies and sizes. Our results suggest that in the early stage of a synthesis, the Pt（II） precursor is reduced to atoms exclusively in the solution phase, followed by homogeneous nucleation to generate nuclei and then seeds. At a relatively low reaction temperature such as 22℃, the growth of the seeds is dominated by autocatalytic surface reduction that involves the adsorption and then reduction of the Pt（II） precursor on the surface of the just-formed seeds. This particular growth pathway results in relatively large assemblies of Pt nanocrystals. When the reaction temperature is increased to 100 ℃, the dominant reduction pathway will be switched from surface to solution phase, producing much smaller asselnblies of Pt nanocrystals. Our results also demonstrate that a similar trend applies to the seed-rnediated growth of Pt nanocrystals in the presence of Pd nanocubes.
基金Project supported by the Key-Area Research and Development Program of Guang Dong Province,China(Grant No.2019B030330001)the National Key R&D Program of China(Grant No.2016YFA0202000)+2 种基金the Natural Science Foundation of Guangdong Province,China(Grant No.2018B030311045)the National Natural Science Foundation of China(Grant No.11704419)the Physical Research Platform(PRP)in School of Physics,SYSU。
文摘Using density functional theory,we investigate the vibrational properties and polarization-resolved Raman spectra ofα-PtO_(2) and obtain the Raman tensor and angle-dependent Raman intensity of α-PtO_(2).It is found that the polar plot of A_(1g)mode in parallel polarization configuration is useful in identifying the orientation of the crystal.The Raman intensity of the E_(g) mode is about five times stronger than that of the A_(1g) mode.The Raman intensity is about three times stronger when the wave vector of the incident light is in x or y direction than in z direction.Our work will help the material scientists to characterize the α-PtO_(2) and to identify its orientation by comparing the experimental spectra with our result.
