Effective detection of early Citrus Huanglongbing by polyethyleneimine modified multi-walled carbon nanotubes gas sensor

文献类型： 外文期刊

第一作者： Weng, Jingfeng

作者： Weng, Jingfeng;Zhang, Junzhe;Zhang, Chunyu;Chen, Wenli;Lv, Jin;Liu, Jinhui;Zhou, Chengqian;Yuan, Jun;Wang, Min;Xu, Dongqing;Zhong, Yun

作者机构：

关键词： Citrus Huanglongbing; Volatile organic compounds; Carboxylic multi-walled carbon nanotubes; Gas sensors; Polyethyleneimine

期刊名称：SENSORS AND ACTUATORS B-CHEMICAL （ 影响因子：9.221； 五年影响因子：7.676 ）

ISSN：

年卷期： 2022 年 371 卷

页码：

收录情况： SCI

摘要： Citrus Huanglongbing (HLB) is incurable, so it is necessary to develop an accurate and timely detection method for citrus HLB. Volatile organic compounds (VOCs) of plants can be used as an indicator of their health status. Based on the difference of VOCs between healthy and HLB citrus leaves, we designed the polyethyleneimine (PEI)-modified carboxylic multi-walled carbon nanotubes (CNT-COOH) gas sensor and used it in the diagnosis of citrus HLB. Our PEI/CNT-COOH sensor showed significant impedance responses to four citrus HLB biomarkers VOCs (ethylhexanol, phenylacetaldehyde, linalool and methyl salicylate) with sensitivity up to single-digit ppm. We then used the sensor to detect the VOCs in citrus leaves, and found that the diseased citrus can be distin-guished from the healthy citrus according to the different response values of the sensor, successfully identified HLB-infected citrus. Compared with the conventional qPCR method, PEI/CNT-COOH sensor not only has higher accuracy, but also can be used in real time field detection of citrus leaves due to its less stringent operating condition and portability.

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