Polydopamine (PDA) coating of surfaces is a versatile strategy to fabricate functional films on various substrates, which typically requires oxygen and alkaline pH. Overcoming such limitations may enhance the versatility of this technique. Herein, we develop a simple and green sonochemical process for PDA coatings, which overcomes the limitations of traditional coating technique and expands the versatility of PDA chemistry. The oxidizing radicals generated by high frequency ultrasound (412 kHz) are utilized to initiate and accelerate the polymerization of dopamine. The sonochemical rate of film deposition is found to be about twice faster than that of the traditional method in the presence of oxygen. Importantly, the PDA coatings can be obtained in neutral or acidic aqueous solutions and even in the absence of oxygen. The PDA coatings can be moderated by turning on or off high frequency ultrasound. This study provides an environmentally friendly and economic method for the engineering of PDA coatings independent of the solution pH and nature of dissolved gas.

表面聚多巴胺 (PDA) 涂层是一种在各种基材上制造功能薄膜的通用策略，通常需要氧气和碱性 pH 值。克服这些限制可能会增强该技术的多功能性。在此，我们开发了一种简单、绿色的PDA涂层声化学工艺，克服了传统涂层技术的局限性，扩展了PDA化学的多功能性。高频超声波（412 kHz）产生的氧化自由基用于引发和加速多巴胺的聚合。研究发现，在有氧存在的情况下，薄膜沉积的声化学速率比传统方法快约两倍。重要的是，PDA 涂层可以在中性或酸性水溶液中甚至在没有氧气的情况下获得。 PDA 涂层可以通过打开或关闭高频超声波来调节。这项研究为 PDA 涂层工程提供了一种环保且经济的方法，与溶液 pH 值和溶解气体的性质无关。