Progressive NO2 Sensors with Rapid Alarm and Persistent Memory‐Type Responses for Wide‐Range Sensing Using Antimony Triselenide Nanoflakes. (2nd July 2021)

• Record Type: Journal Article
• Authors: Kim, Young Been; Jung, Sung Hyeon; Kim, Dong Su; Deshpande, Nishad G.; Suh, Hee Won; Lee, Hak Hyeon; Choi, Ji Hoon; Lee, Ho Seong; Cho, Hyung Koun
• Is Part Of: Advanced functional materials. Volume 31:Number 38(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-02
• Subjects: antimony triselenide -- memory‐type sensing -- nanoflake structures -- NO 2 gas sensors -- room‐temperature recovery; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202102439
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: Antimony triselenide (Sb2 Se3 ) nanoflake‐based nitrogen dioxide (NO2 ) sensors exhibit a progressive bifunctional gas‐sensing performance, with a rapid alarm for hazardous highly concentrated gases, and an advanced memory‐type function for low‐concentration (<1 ppm) monitoring repeated under potentially fatal exposure. Rectangular and cuboid shaped Sb2 Se3 nanoflakes, comprising van der Waals planes with large surface areas and covalent bond planes with small areas, can rapidly detect a wide range of NO2 gas concentrations from 0.1 to 100 ppm. These Sb2 Se3 nanoflakes are found to be suitable for physisorption‐based gas sensing owing to their anisotropic quasi‐2D crystal structure with extremely enlarged van der Waals planes, where they are humidity‐insensitive and consequently exhibit an extremely stable baseline current. The Sb2 Se3 nanoflake sensor exhibits a room‐temperature/low‐voltage operation, which is noticeable owing to its low energy consumption and rapid response even under a NO2 gas flow of only 1 ppm. As a result, the Sb2 Se3 nanoflake sensor is suitable for the development of a rapid alarm system. Furthermore, the persistent gas‐sensing conductivity of the sensor with a slow decaying current can enable the development of a progressive memory‐type sensor that retains the previous signal under irregular gas injection at low concentrations. Abstract : Progressive NO2 gas sensors with bifunctional performance involving a rapid alarm for high‐concentration gas and an advanced memory‐type function for low‐concentration gas monitoring are achieved using Sb2 Se3 nanoflakes. Sb2 Se3 nanoflakes are unidirectionally linked to the anisotropic connections of the ribbon structures, resulting in considerable exposure of the van der Waals planes, intensifying the physisorption and chemisorption reactions.