Graduate Program in Electrical and Computer Engineering, Federal University of Technology-Paraná, Curitiba 80230-901, Brazil.
Institute of Physics, University of São Paulo, São Carlos 13566-590, Brazil.
Sensors (Basel). 2021 Jul 21;21(15):4947. doi: 10.3390/s21154947.
This work reports on a reduced graphene oxide and poly(aniline) composite (rGO-PANI), with rGO clusters inserted between PANI chains. These clusters were formed due the plasticizing effect of N-methyl-2-pyrrolidone (NMP) solvent, which was added during the synthesis. Further, this composite was processed as thin film onto an interdigitated electrode array and used as the sensitive layer for ammonia gas, presenting sensitivity of 250% at 100 ppm, a response time of 97 s, and a lowest detection limit of 5 ppm. The PANI deprotonation process, upon exposure to NH, rGO, also contributed by improving the sensitivity due its higher surface area and the presence of carboxylic acids. This allowed for the interaction between the hydrogen of NH (nucleophilic character) and the -COOH groups (electrophilic character) from the rGO surface, thereby introducing a promising sensing composite for amine-based gases.
这项工作报道了一种还原氧化石墨烯和聚苯胺复合材料（rGO-PANI），其中 rGO 簇插入到 PANI 链之间。这些簇是由于 N-甲基-2-吡咯烷酮（NMP）溶剂的塑化作用而形成的，该溶剂在合成过程中被添加。此外，该复合材料被加工成薄膜状，覆盖在叉指电极阵列上，并用作氨气的敏感层，在 100ppm 时灵敏度为 250%，响应时间为 97s，最低检测限为 5ppm。PANI 的去质子化过程，在暴露于 NH 时，rGO 也由于其更高的表面积和存在羧酸而提高了灵敏度。这允许 NH 的氢（亲核性质）与 rGO 表面的-COOH 基团（亲电性质）之间相互作用，从而为基于胺的气体引入了一种有前途的传感复合材料。
