Abstract

The aim of this study is to develop and characterize an activated biochar-based polymer composite for biosensors in smart food packaging. Biochar was made from corn stover and activated using the steam-activation method. The activated biochar (ABC) was synthesized with polylactic acid (PLA) by a solvent casting method. While ABC ranged from 85% to 50%, PLA content varied from 15% to 50% (w/w) in the polymer composite. The electrical conductivity of the developed ABC/PLA composite was measured through differential plus voltammetry (DPV) and cyclic voltammetry (CV) using a potentiostat. It was found that the current increased from 0.3 to 2.31 mA for CV and 0.16 to 1.02 mA for DPV when ABC contents changed from 50% to 85%. The tensile strength (TS) and Young 's modulus of the ABC/PLA composite film increased from 0.81 to 3.04 MPa and 56.31 to 102.69 MPa respectively when PLA contents increased from 15% to 50%. The biosensor was fabricated with 85% ABC/PLA-based composite using a drop-casting method. The resistance of the fabricated biosensor increased as the concentration of NH₃ increased over the range of 80 to 170 ppm.

摘要

本研究的目的是开发和表征一种用于智能食品包装中生物传感器的活化生物炭基聚合物复合材料。生物炭由玉米秸秆制成，并使用蒸汽活化方法活化。活性生物炭（ABC）是由聚乳酸（PLA）通过溶剂浇铸法合成的。虽然 ABC 的范围为 85% 到 50%，但聚合物复合材料中的 PLA 含量从 15% 到 50% (w/w) 不等。开发的 ABC/PLA 复合材料的电导率是通过微分加伏安法 (DPV) 和循环伏安法 (CV) 使用恒电位仪测量的。发现当 ABC 含量从 50% 变为 85% 时，CV 的电流从 0.3 mA 增加到 2.31 mA，DPV 的电流从 0.16 mA 增加到 1.02 mA。ABC/PLA 复合薄膜的拉伸强度 (TS) 和杨氏模量从 0.81 增加到 3.04 MPa，从 56.31 增加到 102。当 PLA 含量从 15% 增加到 50% 时，分别为 69 MPa。该生物传感器采用滴铸法由 85% ABC/PLA 基复合材料制成。所制造的生物传感器的电阻随着 NH 浓度的增加而增加₃在 80 至 170 ppm 的范围内增加。