Demirci Sahin, Can Mehmet, Sahiner Nurettin
Department of Chemistry & Nanoscience and Technology Research and Application Center, Canakkale Onsekiz Mart University Terzioglu Campus, Canakkale 17100, Turkey.
Department of Chemical and Biomolecular Engineering, University of South Florida, Tampa, FL 33620, USA.
Micromachines (Basel). 2020 Jun 27;11(7):626. doi: 10.3390/mi11070626.
In this study, macroporous graphene aerogels (GAs) were synthesized by chemical reduction of graphene oxide sheets and were used as a support material for in situ synthesis of conductive poly(para-phenylenediamine) (p(p-PDA)). The in situ synthesis of p(p-PDA) in GA was carried out by using a simple oxidation polymerization technique. Moreover, the prepared conductive p(p-PDA) polymers in the networks of GAs were doped with various types of acids such as hydrochloric acid (HCl), nitric acid (HNO), sulfuric acid (HSO), phosphoric acid (HPO), respectively. The prepared GA and different acid-doped forms as GA/p(p-PDA) composites were characterized by FT-IR, TGA, and conductivity measurements. The observed FT-IR peaks at 1574 cm, and 1491 cm, for stretching deformations of quinone and benzene, respectively, confirmed the in situ synthesis of P(p-PDA) polymers within GAs. The conductivity of GAs with 2.17 × 10 ± 3.15 × 10 S·cm has experienced an approximately 250-fold increase to 5.16 × 10 ± 2.72 × 10 S·cm after in situ synthesis of p(p-PDA) polymers and with HCl doping. Conductivity values for different types of acid-doped GA/p(p-PDA) composites were compared with the bare p(p-PDA) and their undoped forms. Moreover, the changes in the conductivity of GA and GA/p(p-PDA) composites upon CO gas exposure were compared and their sensory potential in terms of response and sensitivity, along with reusability in CO detection, were evaluated.
在本研究中，通过化学还原氧化石墨烯片合成了大孔石墨烯气凝胶（GAs），并将其用作原位合成导电聚对苯二胺（p(p-PDA)）的支撑材料。采用简单的氧化聚合技术在GA中原位合成p(p-PDA)。此外，在GA网络中制备的导电p(p-PDA)聚合物分别用盐酸（HCl）、硝酸（HNO）、硫酸（HSO）、磷酸（HPO）等不同类型的酸进行掺杂。通过傅里叶变换红外光谱（FT-IR）、热重分析（TGA）和电导率测量对制备的GA以及不同酸掺杂形式的GA/p(p-PDA)复合材料进行了表征。在1574 cm和1491 cm处观察到的分别对应醌和苯拉伸变形的FT-IR峰，证实了在GA内原位合成了P(p-PDA)聚合物。在原位合成p(p-PDA)聚合物并进行HCl掺杂后，GA的电导率从2.17×10±3.15×10 S·cm增加到5.16×10±2.72×10 S·cm，提高了约250倍。将不同类型酸掺杂的GA/p(p-PDA)复合材料的电导率值与纯p(p-PDA)及其未掺杂形式进行了比较。此外，比较了GA和GA/p(p-PDA)复合材料在暴露于CO气体时电导率的变化，并评估了它们在CO检测方面的响应、灵敏度以及可重复使用性等传感潜力。
