Highly Sensitive Colorimetric Detection of Early Stage Aluminum Corrosion in Water Using Plasmonic Gold Nanoparticle Films,Advanced Optical Materials

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Highly Sensitive Colorimetric Detection of Early Stage Aluminum Corrosion in Water Using Plasmonic Gold Nanoparticle Films
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2018-08-24 , DOI: 10.1002/adom.201800599
Alexander B. Tesler ₁ , Takumi Sannomiya ₂ , Alexander Vaskevich ₁ , Eyal Sabatani ₃ , Israel Rubinstein ₁

Affiliation

Corrosion remains the major reason for the failure of metallic parts. Therefore, spotting and evaluating the severity of corrosion at its early stages is of great importance. Herein, a novel optical corrosion probe based on plasmonic gold nanoparticles immobilized on aluminum surface is demonstrated. The measurements confirm that the corrosion rate and mechanism of bare aluminum is identical to that of the developed probe. During Al corrosion, the gold nanoparticles are located entirely at the interface between the inner dense and outer porous layers of the formed aluminum oxide. The growth of the inner oxide layer during corrosion prompts a change in the reflection spectra and the appearance of strong coloration that is easily observed by the naked eye. Numerical modeling reveals that these optical changes occur mainly due to light interference within the inner oxide layer, which is located between the plasmonic gold nanoparticles and the underlying reflective aluminum. The ability of the plasmonic probe is further demonstrated to monitor the aqueous corrosion of thin films, bulk and alloyed Al, as well as Al protected by a self‐assembled monolayer of hydrophobic surfactant, and, hence, the wide applicability of the method.

中文翻译：

等离子金纳米粒子膜用于水的早期铝腐蚀的高灵敏比色检测

腐蚀仍然是金属零件失效的主要原因。因此，在早期发现并评估腐蚀的严重性非常重要。本文中，展示了一种基于固定在铝表面上的等离激元金纳米粒子的新型光学腐蚀探针。测量结果证实，裸露的铝的腐蚀速率和腐蚀机理与开发的探头相同。在铝腐蚀期间，金纳米颗粒完全位于形成的氧化铝的内部致密层和外部多孔层之间的界面处。腐蚀过程中内部氧化物层的生长促使反射光谱发生变化，并出现肉眼容易观察到的强烈着色。数值建模表明，这些光学变化的发生主要是由于内部等离子体层（位于等离激元金纳米颗粒和下面的反射铝之间）内部的光干扰引起的。等离子体探头的能力进一步证明了其能够监测薄膜，块状和合金化的铝以及由疏水性表面活性剂的自组装单层保护的铝的水腐蚀，因此该方法的广泛适用性。

更新日期：2018-08-24

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