Permeability and Dynamics of a Monolayer are Mediated by ITO Support Surface-Modification,The Journal of Physical Chemistry B

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Permeability and Dynamics of a Monolayer are Mediated by ITO Support Surface-Modification
The Journal of Physical Chemistry B ( IF 2.8 ) Pub Date : 2023-09-01 , DOI: 10.1021/acs.jpcb.3c02803
Homa Sadeghzadeh ₁ , Diana K Nazario Torres ₁ , G J Blanchard ₁

Affiliation

Indium tin oxide (ITO) has been extensively used as a transparent conductor. The surface chemistry of ITO is amenable to reactions similar to those used to modify silica, but a long-standing issue has been understanding the density and robustness of the ITO surface-modification. We report on the formation of chemically bound Cd²⁺-complexed octadecylphosphonic acid (ODPA) monolayer formed on a Langmuir trough and deposited using Langmuir–Blodgett (LB) methodology onto an ITO surface, either in its native form or functionalized with phosphonate (RPO₃^2–). The organization of the Langmuir monolayer depends on the pH and presence of Cd²⁺ in the aqueous subphase on which it is formed and on the functionalization of the ITO surface. We probe the permeability of the resulting LB–support interface electrochemically and the motional freedom characteristic of chromophores contained within the monolayer using fluorescence recovery after photobleaching (FRAP). Our data demonstrate that without modification of the ITO surface the monolayer is significantly permeable by the electrophores used (ferrocene and Ru³⁺), and surface modification to produce covalently bound phosphonate functionality results in a monolayer that is impermeable to the electrophores. FRAP studies reveal a relatively rigid monolayer aliphatic chain region for deposition on either native or modified ITO, suggesting direct Cd²⁺–ITO interactions.

中文翻译：

单分子层的渗透性和动力学由 ITO 支持表面改性调节

氧化铟锡（ITO）已被广泛用作透明导体。ITO 的表面化学性质适合与二氧化硅改性反应类似的反应，但一个长期存在的问题是了解 ITO 表面改性的密度和稳健性。我们报告了化学结合的 Cd ²⁺络合十八烷基膦酸 (ODPA) 单层的形成，该单层在 Langmuir 槽上形成，并使用 Langmuir-Blodgett (LB) 方法沉积到 ITO 表面上，无论是其天然形式还是用膦酸酯 (RPO) 功能化₃^2– )。Langmuir 单层的组织取决于其形成的水相亚相中的pH 值和 Cd ^{2+的存在以及 ITO 表面的功能化。}我们利用光漂白后的荧光恢复 (FRAP) 方法，以电化学方式探测所得 LB-载体界面的渗透性，以及单层内所含发色团的运动自由度特征。^{我们的数据表明，在不修饰 ITO 表面的情况下，单层对于所用的电泳剂（二茂铁和 Ru 3+}）具有显着的渗透性，而进行表面修饰以产生共价结合的膦酸酯官能团会导致单层对电泳剂是不可渗透的。FRAP 研究揭示了沉积在天然或改性 ITO 上的相对刚性的单层脂肪链区域，表明 Cd ²⁺ -ITO 存在直接相互作用。

更新日期：2023-09-01

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