Thin films of millimeter-scale continuous monolayer WS_(2) have been grown on SiO_(2)/Si substrate,followed by the deposition ofβ-In_(2)Se_(3) crystals on monolayer WS2 to prepare In_(2)Se_(3)/WS_(2) van deWaals hete...Thin films of millimeter-scale continuous monolayer WS_(2) have been grown on SiO_(2)/Si substrate,followed by the deposition ofβ-In_(2)Se_(3) crystals on monolayer WS2 to prepare In_(2)Se_(3)/WS_(2) van deWaals heterostructures by a two-step chemical vapor deposition(CVD)method.After the growth of In_(2)Se_(3) at elevated temperatures,high densities of In_(2)Se_(3)/WS_(2) heterostructure bubbles with monolayer to multilayerβ-In_(2)Se_(3) crystals atop are observed.Fluorescence of the resultantβ-In_(2)Se_(3)/WS_(2) heterostructure is greatly enhanced in intensity upon the formation of bubbles,which are evidenced by the Newton’s rings in optical image owing to constructive and destructive interference.In photoluminescence(PL)mapping images of monolayerβ-In_(2)Se_(3)/monolayer WS2 heterobilayer bubble,significant oscillatory behavior of emission intensity is demonstrated due to constructive and destructive interference.However,oscillatory behaviors of peak position are also observed and come from a local heating effect induced by an excitation laser beam.The oscillatory mechanism of PL is further verified by changing the exterior pressure of bubbles placed in a home-made vacuum chamber.In addition,redshifted in peak position and broadening in peak width are observed due to strain effect during decreasing the exterior pressure of bubbles.展开更多
本文利用微波辅助水热法在碳布上快速合成了CoP纳米线阵列(CoP/CC)双功能电极材料,可用于析氢反应(HER)和超级电容器的电极.CoP/CC用于HER时展现了优越的电化学性能,其塔菲尔斜率为56 mV/dec.当电流密度为10 mA cm^(-2)时,其电位低至68 ...本文利用微波辅助水热法在碳布上快速合成了CoP纳米线阵列(CoP/CC)双功能电极材料,可用于析氢反应(HER)和超级电容器的电极.CoP/CC用于HER时展现了优越的电化学性能,其塔菲尔斜率为56 mV/dec.当电流密度为10 mA cm^(-2)时,其电位低至68 mV.值得注意的是,CoP/CC也可用于超级电容器的电极.在扫描速率为5 mV s^(-1)时,其比电容高达674 F g^(-1).同时具有高的循环稳定性,在循环10000次后,比电容仍然可以维持在初始值的86%.本文结果表明,CoP/CC可以作为HER和超级电容器电极的有力候选者.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.51732010 and 51972280)the Natural Science Foundation of Hebei Province,China(Grant No.E2019203233)the Research Program of the College Science&Technology of Hebei Province,China(Grant No.ZD2020121).
文摘Thin films of millimeter-scale continuous monolayer WS_(2) have been grown on SiO_(2)/Si substrate,followed by the deposition ofβ-In_(2)Se_(3) crystals on monolayer WS2 to prepare In_(2)Se_(3)/WS_(2) van deWaals heterostructures by a two-step chemical vapor deposition(CVD)method.After the growth of In_(2)Se_(3) at elevated temperatures,high densities of In_(2)Se_(3)/WS_(2) heterostructure bubbles with monolayer to multilayerβ-In_(2)Se_(3) crystals atop are observed.Fluorescence of the resultantβ-In_(2)Se_(3)/WS_(2) heterostructure is greatly enhanced in intensity upon the formation of bubbles,which are evidenced by the Newton’s rings in optical image owing to constructive and destructive interference.In photoluminescence(PL)mapping images of monolayerβ-In_(2)Se_(3)/monolayer WS2 heterobilayer bubble,significant oscillatory behavior of emission intensity is demonstrated due to constructive and destructive interference.However,oscillatory behaviors of peak position are also observed and come from a local heating effect induced by an excitation laser beam.The oscillatory mechanism of PL is further verified by changing the exterior pressure of bubbles placed in a home-made vacuum chamber.In addition,redshifted in peak position and broadening in peak width are observed due to strain effect during decreasing the exterior pressure of bubbles.
基金supported by the National Natural Science Foundation of China (51571172,51672240,51571171,and 11404280)the Natural Science Foundation for Distinguished Young Scholars of Hebei Province (E2017203095)+1 种基金the Natural Science Foundation of Hebei Province (E2016203484 and A2015203337)the Research Program of the College Science & Technology of Hebei Province (ZD2017083 and QN2014047)
基金supported by the National Natural Science Foundation of China (51732010,51571172,11404280,51672240 and 51571171)the Natural Science Foundation for Distinguished Young Scholars of Hebei Province (E2017203095)+2 种基金the Natural Science Foundation of Hebei Province (E2016203484 and A2015203337)the Research Program of the College Science & Technology of Hebei Province (ZD2017083 and QN2014047)the Graduate Innovation Fund (CXZZSS2017055 and 2017XJSS044)
文摘本文利用微波辅助水热法在碳布上快速合成了CoP纳米线阵列(CoP/CC)双功能电极材料,可用于析氢反应(HER)和超级电容器的电极.CoP/CC用于HER时展现了优越的电化学性能,其塔菲尔斜率为56 mV/dec.当电流密度为10 mA cm^(-2)时,其电位低至68 mV.值得注意的是,CoP/CC也可用于超级电容器的电极.在扫描速率为5 mV s^(-1)时,其比电容高达674 F g^(-1).同时具有高的循环稳定性,在循环10000次后,比电容仍然可以维持在初始值的86%.本文结果表明,CoP/CC可以作为HER和超级电容器电极的有力候选者.
