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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >pH-Controlled Formation Kinetics of Self-Assembled Layers of Thioctic Acid on Gold Nanoparticles
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pH-Controlled Formation Kinetics of Self-Assembled Layers of Thioctic Acid on Gold Nanoparticles

机译：pH控制的金纳米颗粒上硫辛酸自组装层的形成动力学

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摘要

The adsorption kinetics of thioctic acid (ToA) self-assembled monolayer (SAM) formation has been observed by monitoring small changes in the extinction of a gold nanoparticle surface, interrogated by evanescent wave cavity ring-down spectroscopy. A direct measurement of the adsorption kinetics for charged and neutral SAM formation has been made and modeled and shows significant differences in the lateral interactions between surface moieties: the interaction parameter for the charged species is 20 times larger than for the neutral species. Titration of ToA SAMs deposited from basic conditions demonstrate a pH-switchable surface with charge densities varying from 0.1 to 1.0 e nm~(-2). Similar measurements were performed from SAMs deposited under acidic conditions producing charge densities of 1.8 e nm~(-2). The surface potential varies between -44 and -198 mV for all SAMs, which produces an interfacial pH 0.8-3.4 units more acidic than the bulk and interfacial capacitances varying from 5.5 to 88 mu F cm~(-2).
机译：硫a酸（ToA）自组装单层（SAM）形成的吸附动力学已通过监测金纳米粒子表面消光的微小变化进行了观察，并通过e逝波腔衰荡光谱法进行了研究。已对带电和中性SAM形成的吸附动力学进行了直接测量，并进行了建模，结果表明表面部分之间的侧向相互作用存在显着差异：带电物种的相互作用参数比中性物种大20倍。从碱性条件下滴定的ToA SAM的滴定表明pH值可调节的表面具有0.1到1.0 e nm〜（-2）的电荷密度。在酸性条件下沉积的SAM进行了类似的测量，产生的电荷密度为1.8 e nm〜（-2）。所有SAM的表面电势在-44至-198 mV之间变化，产生的酸性pH比本体和介电常数在5.5至88μFcm〜（-2）之间的酸性高0.8-3.4个单位。

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