Balkan Alper, Armagan Efe, Ozaydin Ince Gozde
Materials Science and Nanoengineering Program, Faculty of Engineering and Natural Sciences, Sabanci University, Tuzla, Istanbul 34956, Turkey.
Nanotechnology Application Center, Sabanci University, Orhanli, Tuzla, Istanbul 34956, Turkey.
Beilstein J Nanotechnol. 2017 Apr 18;8:872-882. doi: 10.3762/bjnano.8.89. eCollection 2017.
Vapor-phase synthesis techniques of polymeric nanostructures offer unique advantages over conventional, solution-based techniques because of their solventless nature. In this work, we report the fabrication of coaxial polymer nanotubes using two different chemical vapor deposition methods. The fabrication process involves the deposition of an outer layer of the conductive polyaniline (PANI) by oxidative chemical vapor deposition, followed by the deposition of the inner layer of poly(2-hydroxyethyl methacrylate) (pHEMA) hydrogel by initiated chemical vapor deposition. The vapor-phase techniques allowed for fine-tuning of the thickness of the individual layers, keeping the functionalities of the polymers intact. The response of the single components and the coaxial nanotubes to changes in humidity was investigated for potential humidity sensor applications. For single-component conductive PANI nanotubes, the resistance changed parabolically with relative humidity because of competing effects of doping and swelling of the PANI polymer under humid conditions. Introducing a hydrogel inner layer increased the overall resistance, and enhanced swelling, which caused the resistance to continuously increase with relative humidity.
聚合物纳米结构的气相合成技术由于其无溶剂的特性，与传统的基于溶液的技术相比具有独特的优势。在这项工作中，我们报道了使用两种不同的化学气相沉积方法制备同轴聚合物纳米管。制备过程包括通过氧化化学气相沉积沉积导电聚苯胺（PANI）的外层，然后通过引发化学气相沉积沉积聚（甲基丙烯酸2-羟乙酯）（pHEMA）水凝胶的内层。气相技术允许对各层的厚度进行微调，同时保持聚合物的功能不变。研究了单一组分和同轴纳米管对湿度变化的响应，以用于潜在的湿度传感器应用。对于单组分导电PANI纳米管，由于在潮湿条件下PANI聚合物的掺杂和溶胀的竞争效应，电阻随相对湿度呈抛物线变化。引入水凝胶内层增加了总电阻，并增强了溶胀，这导致电阻随相对湿度持续增加。
