Abstract

Iron oxide-decorated cellulose nanocrystal (Fe-CNC) was incorporated into polylactic acid and exfoliated graphene (GR) system (PLA-S-2.5GR) to investigate the impact of Fe-CNC inclusion on the properties of PLA/GR composite and to optimize Fe-CNC loading. Fe-CNC loading of 0.5 wt% (PLA-S-2.5GR-0.5Fe) displayed comparable thermal stability, better dispersion, better mechanical strength and unaltered GR networks inside the composite. Then, PLA-S-2.5GR-0.5Fe was utilized as ethanol sensor. Recycle, reusability and repeatability studies followed by stability analysis after use were conducted. The results clearly demonstrated that PLA-S-2.5GR-0.5Fe is a suitable candidate for ethanol detection. The PLA-based composite film, possibly for the first time, was also successfully used as an electrode for detection of biomolecules such as d-glucose and glycine. The composites showed the potential to generate distinct current–voltage response in the presence of different stimuli of various concentrations that can be utilized to detect and measure different biomolecules and their concentrations.

中文翻译：

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Fe-CNC / GR / PLA复合材料作为生物分子电位传感器的适用性

摘要

将氧化铁修饰的纤维素纳米晶体（Fe-CNC）掺入聚乳酸和片状石墨烯（GR）体系（PLA-S-2.5GR）中，以研究Fe-CNC夹杂物对PLA / GR复合材料性能的影响以及优化Fe-CNC负载。Fe-CNC负载量为0.5 wt％（PLA-S-2.5GR-0.5Fe）显示出可比的热稳定性，更好的分散性，更好的机械强度和复合材料内部不变的GR网络。然后，将PLA-S-2.5GR-0.5Fe用作乙醇传感器。使用后进行了回收利用，可重复使用性和可重复性研究，然后进行了稳定性分析。结果清楚地表明，PLA-S-2.5GR-0.5Fe是乙醇检测的合适候选物。基于PLA的复合膜（可能是首次）也成功用作检测生物分子的电极，例如d-葡萄糖和甘氨酸。在存在各种浓度的不同刺激的情况下，复合材料显示出产生独特的电流-电压响应的潜力，可用于检测和测量不同的生物分子及其浓度。