Choi Suhyuk, Ahn Hyun S
Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
ACS Sens. 2023 Apr 28;8(4):1750-1755. doi: 10.1021/acssensors.3c00037. Epub 2023 Mar 24.
Development of sensing technologies for trace vapors of nitroaromatic compounds (NACs) is highly desired due to the toxic and explosive nature of the target molecules. Here, a NAC sensor based on a membraneless ionic liquid electrochemical cell was developed and applied for room-temperature trace vapor detection. Submicrometer working electrode dimensions yielded maximized portability and cost efficiency and extremely short time scales for molecular identification. The nanoprobe exhibited detection limitscomparable to those of state-of-the-art NAC sensors. The most noteworthy feature was the fast response to trace vapors, allowing for real-time detection of NACs without sample pretreatment. The pulled capillary form factor of the developed sensor enabled its application as tip electrodes in gas-phase scanning electrochemical microscopy (SECM). With the degree of freedom in three dimensions, mapping of the differential vapor pressure of NACs was possible, leading to potential application of the probe in sniffing out the source of explosive gas dissemination.
由于目标分子具有毒性和爆炸性，因此迫切需要开发用于检测硝基芳香族化合物（NACs）痕量蒸气的传感技术。在此，基于无膜离子液体电化学池开发了一种NAC传感器，并将其应用于室温痕量蒸气检测。亚微米级的工作电极尺寸实现了最大的便携性和成本效益，以及极短的分子识别时间尺度。该纳米探针的检测限与最先进的NAC传感器相当。最值得注意的特点是对痕量蒸气的快速响应，无需样品预处理即可实时检测NACs。所开发传感器的拉制毛细管外形使其能够作为尖端电极应用于气相扫描电化学显微镜（SECM）。凭借三维自由度，可以绘制NACs的差分蒸气压图，从而使该探针有可能应用于嗅出爆炸性气体扩散源。
