Wearable Plant Sensor for In Situ Monitoring of Volatile Organic Compound Emissions from Crops
Wearable Plant Sensor for In Situ Monitoring of Volatile Organic Compound Emissions from Crops
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DOI：
10.1021/acssensors.2c00834
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发表时间：
2022-08-08
期刊：
影响因子：
8.9
通讯作者：
Dong, Liang
中科院分区：
文献类型：
--
作者：
Ibrahim, Hussam;Moru, Satyanarayana;Dong, Liang
甲醇是植物排放的主要挥发性有机化合物（VOC）。甲醇的排放反映了植物对昆虫的间接防御，促进了细胞间的通讯，并使植物适应各种环境胁迫。本文报道了一种可穿戴式植物传感器，该传感器可在野外条件下直接在植物叶片上监测甲醇排放，具有成本低、便携性好、安装使用方便等特点。传感器技术消除了传统气相色谱-质谱法对复杂采样、昂贵仪器和熟练操作员的需求。该传感器使用导电聚合物微晶和铂纳米颗粒（PtNPs）的复合材料。导电的聚（2-氨基-1，3，4-噻二唑）或聚（ATD）提供具有氧化还原行为的高电催化活性。用催化PtNPs对聚（ATD）进行改性使得能够在特定电位下有效地电化学氧化甲醇。聚（ATD）和PtNP的优点协同作用，使得传感器具有高灵敏度和选择性，用于检测具有亚ppm检测限的甲醇排放。此外，将聚合物电解质注入传感器的多孔电极中能够实现全固态VOC传感器。该传感器被集成到一个微型气体收集室，并与疏水气体扩散膜覆盖，以尽量减少环境湿度对传感器性能的影响。传感器安装在叶片表面。原位检测表明，温室玉米植株下部和上部叶片之间的甲醇排放量存在差异。此外，在田间条件下，传感器揭示了两种基因型（Mo 17和B73自交系）的玉米植株之间的甲醇排放浓度的显著差异。因此，该传感器将提供一个有前途的新手段，直接监测挥发性排放的植物，这是一个生理表型作为基因和环境的功能。
Methanol is a major volatile organic compound (VOC) emitted from plants. Methanol emission reflects indirect plant defense against insects, promotes cell-to-cell communication, and adapts plants to various environmental stresses. This paper reports a wearable plant sensor that can monitor methanol emission directly on the leaf of a plant under field conditions with low cost, high portability, and easy installation and use. The sensor technology eliminates the need for complex sampling, expensive instruments, and skilled operators for conventional gas chromatography-mass spectrometry. The sensor uses a composite of conducting polymer microcrystallites and platinum nanoparticles (PtNPs). The conducting poly(2-amino-1,3,4-thiadiazole) or poly(ATD) provides a high electrocatalytic activity with redox behavior. The modification of poly(ATD) with catalytic PtNPs enables efficient electrochemical oxidation of methanol at a specific potential. The advantages of poly(ATD) and PtNPs are synergized for high sensitivity and selectivity of the sensor for detecting methanol emissions with a sub-ppm limit of detection. Further, the infusion of a polymer electrolyte into the porous electrode of the sensor enables an all-solid-state VOC sensor. The sensor is integrated into a miniature gas collection chamber and capped with a hydrophobic gas diffusion membrane to minimize the influence of environmental humidity on the sensor performance. The sensor is installed on the leaf surface. In situ detection shows a difference in methanol emission between the lower and upper leaves of greenhouse maize plants. Further, under field conditions, the sensor reveals a noticeable difference in methanol emission concentration between two genotypes (Mo17 and B73 inbred lines) of maize plants. Therefore, the sensor will provide a promising new means of directly monitoring volatile emission of plants, which is a physiological phenotype as a function of genes and environment.