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.
|Number of pages||4|
|Publication status||Published - 2022 Jun 14|
Bibliographical noteFunding Information:
This work was financially supported by Samsung Advanced Institute of Technology and the Basic Science Research Program through the National Research Foundation (NRF) of Korea (Grants NRF-2020R1C1C1007409 and NRF2020R1A4A1017737).
© 2022 American Chemical Society.
All Science Journal Classification (ASJC) codes
- Analytical Chemistry