Large-area vertically aligned 2D MoS2 layers on TEMPO-cellulose nanofibers for biodegradable transient gas sensors. (19th November 2022)

• Record Type: Journal Article
• Authors: Yoo, Changhyeon; Yoon, Jaesik; Kaium, Md Golam; Osorto, Brandon; Han, Sang Sub; Kim, Jung Han; Kim, Bo Kyoung; Chung, Hee-Suk; Kim, Dong-Joo; Jung, Yeonwoong
• Is Part Of: Nanotechnology. Volume 33:Number 47(2022)
• Publication Date: 2022-11-19
• Subjects: 2D MoS2 -- cellulose nanofiber -- flexible device -- transient device -- gas sensor; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac8811
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Crystallographically anisotropic two-dimensional (2D) molybdenum disulfide (MoS2 ) with vertically aligned (VA) layers is attractive for electrochemical sensing owing to its surface-enriched dangling bonds coupled with extremely large mechanical deformability. In this study, we explored VA-2D MoS2 layers integrated on cellulose nanofibers (CNFs) for detecting various volatile organic compound gases. Sensor devices employing VA-2D MoS2 /CNFs exhibited excellent sensitivities for the tested gases of ethanol, methanol, ammonia, and acetone; e.g. a high response rate up to 83.39% for 100 ppm ethanol, significantly outperforming previously reported sensors employing horizontally aligned 2D MoS2 layers. Furthermore, VA-2D MoS2 /CNFs were identified to be completely dissolvable in buffer solutions such as phosphate-buffered saline solution and baking soda buffer solution without releasing toxic chemicals. This unusual combination of high sensitivity and excellent biodegradability inherent to VA-2D MoS2 /CNFs offers unprecedented opportunities for exploring mechanically reconfigurable sensor technologies with bio-compatible transient characteristics.