A bioinspired double-confining strategy enables highly practical target gas detection via promoted solvated ion
Lijuan Wu1, Guocheng Lv1, Lili Wang1
1Engineering Research Center of Ministry of Education for Geological Carbon Storage and Low Carbon Utilization of Resources, Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, Hebei Key Laboratory of Resource Low-carbon Utilization and New Materials, School of Materials Science and Technology, China University of Geosciences, Beijing, 100083, China. guochenglv@cugb.edu.cn.
Abstract:
Electronic signal transmission-based gas sensing materials have been facing the technical bottlenecks of high operating temperature, high power consumption, and adverse humidity interference. In contrast, ionic signal transmission-based human olfaction efficiently functions in complex environmental conditions, which inspires the proposal of a unique gas sensing strategy. Herein, a bionic olfactory film is designed through confining ionic liquids (ILs) (i.e., [Bmim][Tf2N]) within both graphene oxide (GO) nanochannels and sub-nanometer volumes of a polymer matrix. As validated by both experimental data and molecular dynamics (MD) simulations, efficient triethylamine (TEA) detection is achieved due to the double confinement effect which significantly enhances the solvated cation (TEA-[Bmim]+) transport. Under ambient conditions, the films with optimized compositions demonstrate an exceptional response to 20 ppm TEA (1013.52 ± 14.31%), rapid response and recovery times (7.6 s and 26.1 s, respectively), and a low limit of detection (200 ppb). Combined with high selectivity, stability, anti-humidity interference, and low power consumption, the as-prepared bionic olfactory film with double-confined ion channels provides new insights to develop ionic signal transmission-based bionic integrated sensing systems for next-generation robots with intelligent perception toward external stimuli.
More Related Videos
08:06Merging Ion Concentration Polarization between Juxtaposed Ion Exchange Membranes to Block the Propagation of the Polarization Zone
Published on: February 23, 2017
09:34Microfluidic Pneumatic Cages: A Novel Approach for In-chip Crystal Trapping, Manipulation and Controlled Chemical Treatment
Published on: July 12, 2016
