回流法合成硫化锑纳米棒及其光催化性能研究

以三氯化锑(SbCl₃)、硫粉(S)和硼氢化钠(NaBH₄)为原料, 1,2-丙二醇(C₃H₈O₂)作溶剂, 用回流法成功合成了Sb₂S₃纳米棒. 用XRD, EDS, SEM, TEM, HRTEM, SAED以及UV-Vis等手段对所制备产品的晶型、成分、形貌和光学特性进行了表征|以太阳光为光源、亚甲基蓝为目标降解物评价了Sb₂S₃纳米棒的光催化活性. 结果表明, 经186 ℃回流15 h可得到直径约为78～180 nm、长度达2～5 μm的正交晶系的Sb₂S₃单晶纳米棒. 经计算, 其晶胞参数a＝1.124 nm, b＝1.138 nm, c＝0.384 nm. UV-Vis分析表明, Sb₂S₃纳米棒为半导体材料, 其带隙能量为1.52 eV. 光催化性能测试表明, 所制备的Sb₂S₃纳米棒在太阳光下对亚甲基蓝具有较高的光催化降解率, 经20 min降解, 亚甲基蓝的降解率达84.31%, 表现出明显的可见光活性. 加入的PVP对控制Sb₂S₃的形貌有重要的作用. 另外, 还讨论了Sb₂S₃ 纳米棒可能的形成机理.     

A ratiometric fluorescent sensor for tracking Cu(I) fluctuation in endoplasmic reticulum

Science China Chemistry - A two-photon ratiometric fluorescent sensor for Cu+ in endoplasmic reticulum (ER), CNSB, was developed via coumarin/ASBD integration based on FRET mechanism. In solution,...     

A ratiometric fluorescent sensor for tracking Cu(Ⅰ) fluctuation in endoplasmic reticulum

A two-photon ratiometric fluorescent sensor for Cu~+ in endoplasmic reticulum(ER), CNSB, was developed via coumarin/ASBD integration based on FRET mechanism. In solution, CNSB shows reversible, highly-specific ratiometric response to Cu~+ .Moreover, CNSB exhibits suitable K_d value, suggesting the possibility of detecting Cu~+ in the living cells. The probe can enter the MCF-7 cells easily and specifically locates in the ER. The highly specific ratiometric response of CNSB toward Cu~+ in MCF-7 cells provides the sensor the capacity to visualize both exogenous and endogenous Cu~+ in the ER via fluorescence imaging.Next, CNSB was utilized to detect the fluctuation and distribution of Cu~+ under ER stress in MCF-7 cells, which confirmed directly the relationship between Cu~+ enhancement and ER stress. Meanwhile, the two-photon ability of coumarin facilitated the sensor to visualize Cu~+ fluctuation via two-photon fluorescence imaging. In addition, the spatial distribution of Cu~+ in the heart slice of the 14-day-old rat was demonstrated using CNSB. This study demonstrates the promising potential of CNSB in clarifying the Cu~+ -dependent signaling in the ER stress-related diseases.