Department of Chemistry, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea.
Samsung Advanced Institute of Technology, Samsung Electronics, 130 Samsung-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do 16678, Republic of Korea.
Anal Chem. 2022 Jun 14;94(23):8101-8104. doi: 10.1021/acs.analchem.2c00607. Epub 2022 May 9.
A novel membraneless oxygen sensing nanoprobe was developed based on a hanging drop ionic liquid electrochemical cell. An ultrasmall (<500 nm) working electrode and small volume electrochemical cell allowed for an impressively low detection limit of ∼13 ppm and a response time less than 100 ms, which is unusually fast for an electrochemical gas sensor. The oxygen sensor was stable for hours of operation and, owing to the membraneless design, was easily regenerable when fouled. The pulled capillary form factor of the nanoprobe was found compatible with scanning probe techniques, the demonstration of which was made by application as a tip electrode in gas phase scanning electrochemical microscopy (SECM). In the SECM experiments, the oxygen nanoprobe exhibited micrometer scale spatial resolution with ease. This unique probe design developed here may potentially be engineered into versatile sensors for various volatile molecules other than oxygen, such as those pertinent to hazard analysis and biomedical diagnosis.
基于悬挂滴离子液体电化学池，开发了一种新型无膜氧传感纳米探针。超小（<500nm）工作电极和小体积电化学池可实现令人印象深刻的低检测限约为 13ppm 和小于 100ms 的响应时间，这对于电化学气体传感器来说非常快。氧气传感器在数小时的运行中稳定，并且由于无膜设计，当受到污染时可以很容易地再生。纳米探针的拉制毛细管形式因子与扫描探针技术兼容，这通过将其用作气相扫描电化学显微镜（SECM）中的尖端电极来证明。在 SECM 实验中，氧气纳米探针轻松实现了微米级的空间分辨率。这里开发的这种独特的探头设计有可能被设计成用于各种挥发性分子（不仅限于氧气）的多功能传感器，例如与危险分析和生物医学诊断有关的那些分子。
