论文标题
在微孔聚（乙二醇）底物上，与2D- t硝酸盐纳米片沉积物处的离子电流整流相关的过程
Processes associated with ionic current rectification at a 2D-titanate nanosheet deposit on a microhole poly (ethylene terephthalate) substrate
论文作者
论文摘要
具有层状结构的钛酸纳米片（约1.8 nm层厚度和200 nm尺寸）的膜可以形成含有四丁丁基铵阳离子的电解填充的半渗透通道。通过蒸发胶体溶液，很容易形成持续的沉积物。 10微米厚度在6微米 - 厚度 - 乙二醇（乙二醇）（PET）底物上，直径为20微米微孔。当浸入水溶液中时，钛纳米片展示了P.Z.C.符合-37 mV，与阳离子传导（半渗透）沉积物的形成一致。在水解物中有足够低离子的强度，观察到离子电流的整流（阳离子二极管行为）。电流可以剖析到（i）电解质阳离子转运，（ii）电解质阴离子转运和（iii）水杂化导致额外的质子转运。对于所有类型的电解质阳离子，观察到水杂化机制。对于Ca2+和Mg2+离子，水杂化会导致离子电流阻塞，这可能是由于局部氢氧化物诱导的降水过程所致。表现出NBU4+水性可以反转二极管效应（从阳离子到阴离子二极管）。讨论了在淡化和/或离子传感中应用的潜力
Films of titanate nanosheets (approx. 1.8-nm layer thickness and 200-nm size) having a lamellar structure can form electrolytefilled semi-permeable channels containing tetrabutylammonium cations. By evaporation of a colloidal solution, persistent deposits are readily formed with approx. 10 micrometer thickness on a 6-micrometer-thick poly(ethylene-terephthalate) (PET) substrate with a 20 micrometer diameter microhole. When immersed in aqueous solution, the titanate nanosheets exhibit a p.z.c. of -37 mV, consistent with the formation of a cation conducting (semi-permeable) deposit. With a sufficiently low ionic strength in the aqueous electrolyte, ionic current rectification is observed (cationic diode behaviour). Currents can be dissected into (i) electrolyte cation transport, (ii) electrolyte anion transport and (iii) water heterolysis causing additional proton transport. For all types of electrolyte cations, a water heterolysis mechanism is observed. For Ca2+ and Mg2+ ions, water heterolysis causes ion current blocking, presumably due to localised hydroxide-induced precipitation processes. Aqueous NBu4+ is shown to invert the diode effect (from cationic to anionic diode). Potential for applications in desalination and/or ion sensing are discussed
