School of Chemistry and Chemical Engineering , University of Jinan , Jinan 250022 , China.
Jinan Academy of Agricultural Sciences , Jinan 250316 , China.
Anal Chem. 2019 May 7;91(9):5591-5598. doi: 10.1021/acs.analchem.8b04497. Epub 2019 Mar 28.
In this work, low-power and high-performance gas sensors toward trimethylamine (TMA) are presented for the food quality control in the Internet of Things. An amphiphilic perylene diimide derivative (1,6,7,12-tetra-chlorinated perylene- N-(2-hydroxyethyl)- N'-hexylamine-3,4,9,10-tetracarboxylic bisimide, TC-PDI) is synthesized and further employed to construct the organic microrods of TC-PDI and organic/inorganic microbelts of TC-PDI/CdS by a phase transfer method. Due to the formation of n-n heterojunctions, the TC-PDI/CdS microbelts exhibit higher conductivity than the TC-PDI microrods alone, which present an efficient gas sensing platform for TMA determination at room operating temperature with high reproducibility and selectivity. Remarkably, the limit of detection, stability, and selectivity of the TC-PDI/CdS gas sensor are significantly improved, which ascribes to the efficient charge separation of n-n heterojunctions. More importantly, the fabricated gas sensor provides potential application of "on-site" and "on-line" TMA identification in real systems and suggests an efficient way to develop new hybrid n-n heterojunctions for a low-power and high-performance gas sensor.
在这项工作中，针对物联网中的食品质量控制，提出了一种低功耗、高性能的三甲基胺（TMA）气体传感器。合成了一种两亲性苝二酰亚胺衍生物（1,6,7,12-四氯苝-N-(2-羟乙基)-N'-己基胺-3,4,9,10-四羧酸双酰亚胺，TC-PDI），并进一步通过相转移法构建了 TC-PDI 有机微米棒和 TC-PDI/CdS 有机/无机微带。由于形成了 n-n 异质结，TC-PDI/CdS 微带的电导率高于单独的 TC-PDI 微米棒，在室温工作温度下具有高重复性和选择性，是一种用于 TMA 测定的高效气体传感平台。值得注意的是，TC-PDI/CdS 气体传感器的检测限、稳定性和选择性得到了显著提高，这归因于 n-n 异质结的有效电荷分离。更重要的是，所制备的气体传感器为实际系统中“现场”和“在线”TMA 识别提供了潜在的应用，并为开发低功耗、高性能气体传感器的新型混合 n-n 异质结提供了一种有效途径。
