基于双氨基三唑硫醚为中性载体的汞离子选择性电极的研究

研制了基于双氨基三唑硫醚为中性载体的阳离子选择性电极。实验表明,该电极对Hg2 具有良好的电位响应特性,在pH 2.0硝酸盐缓冲液中,电极电位呈近能斯特响应,线性响应范围为4.0 mg/L~20 g/L,斜率为33.4 mV/dec.(25℃),检出限为1.7 mg/L。该电极响应时间短(<10 s),pH范围较宽(1.3~3.3)。将该电极用于实际水样和二元混合溶液中Hg2 的检测,其结果令人满意。     

Octagonal dual-concentric-core photonic crystal fiber for C-band dispersion compensation with low confinement loss

A novel kind of octagonal dual-concentric-core photonic crystal fiber （PCF） is calculated with the finite element method （FEM） and proposed for broadband compensation. In order to realize highly negative dispersion, the hole diameter of the second ring is reduced relative to conventional PCFs. Numerical simulation results show that when the diameters of large holes and small holes are 0.77 pm and 0.5 #m, respectively, and the pitch of the adjacent rings is 1.1 μm, the negative dispersion can achieve about 840 ps.nm^-1.km^-1 at 1 550 nm and the dispersion slope can match with single mode fiber （SMF-28） perfectly. This PCF can compensate the positive dispersion and also its slope of about 50 times its length of SMF-28 fiber, which is suitable for C-band optical fiber telecommunication as a dispersion compensation fiber.     

ECL金属-有机框架(MOF)生物传感平台用于肿瘤细胞分泌H2O2的测定

本工作借助金属-有机框架(MOF)结构, 通过配位作用实现对电化学发光(ECL)分子的空间有序组装, 获得了高性能ECL新材料, 发展了孔道限域效应和微纳空间ECL分子有序组装的协同增强ECL新策略. 具体而言, 以非共平面ECL分子1,1,2,2-四(4-羧基苯)乙烯(H₄TCPE)为配体采用一步水热法合成了具有优异ECL性能的新型MOF材料(Zr-TCPE). Zr-TCPE通过将发光配体H₄TCPE固定在MOF多孔材料上, 一方面其多孔结构可以促进限域空间内物质和电子的传递, 加快电化学反应的效率; 同时, MOF结构的配位键合作用限制了发光基团的自由转动与振动以及分子间的紧密堆积, 从而有效减少了非辐射弛豫和内滤效应. 和H₄TCPE的微纳晶体相比, Zr-TCPE的ECL强度提高了3.46倍, ECL效率提高了17.44倍. 采用Zr-TCPE构建了ECL生物传感平台, 成功实现了在药物刺激下肿瘤细胞释放过氧化氢(H₂O₂)的原位监测, 对临床检测肿瘤细胞具有指导意义.