Author, as appears in the article.: Tripathi, M; Deokar, G; Casanova-Chafer, J; Jin, J; Sierra-Castillo, A; Ogilvie, S P; Lee, F; Iyengar, S A; Biswas, A; Haye, E; Genovese, A; Llobet, E; Colomer, J -F; Jurewicz, I; Gadhamshetty, V; Ajayan, P M; Schwingenschlogl, Udo; Costa, Pedro M F J; Dalton, A B
Department: Enginyeria Electrònica, Elèctrica i Automàtica
URV's Author/s: Casanova Chafer, Juan / Llobet Valero, Eduard
Keywords: Graphene Growth Layers Mos2 nanosheets Sensors Temperature Xp
Abstract: 2D materials, given their form-factor, high surface-to-volume ratio, and chemical functionality have immense use in sensor design. Engineering 2D heterostructures can result in robust combinations of desirable properties but sensor design methodologies require careful considerations about material properties and orientation to maximize sensor response. This study introduces a sensor approach that combines the excellent electrical transport and transduction properties of graphite film with chemical reactivity derived from the edge sites of semiconducting molybdenum disulfide (MoS2) through a two-step chemical vapour deposition method. The resulting vertical heterostructure shows potential for high-performance hybrid chemiresistors for gas sensing. This architecture offers active sensing edge sites across the MoS2 flakes. We detail the growth of vertically oriented MoS2 over a nanoscale graphite film (NGF) cross-section, enhancing the adsorption of analytes such as NO2, NH3, and water vapor. Raman spectroscopy, density functional theory calculations and scanning probe methods elucidate the influence of chemical doping by distinguishing the role of MoS2 edge sites relative to the basal plane. High-resolution imaging techniques confirm the controlled growth of highly crystalline hybrid structures. The MoS2/NGF hybrid structure exhibits exceptional chemiresistive responses at both room and elevated temperatures compared to bare graphitic layers. Quantitative analysis reveals that the sensitivity of this hybrid sensor surpasses other 2D material hybrids, particularly in parts per billion concentrations.
Thematic Areas: Chemistry, physical General materials science Materials science (all) Materials science (miscellaneous) Materials science, multidisciplinary Nanoscience & nanotechnology
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: eduard.llobet@urv.cat juan.casanova@urv.cat
Author identifier: 0000-0001-6164-4342
Record's date: 2024-10-12
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://pubs.rsc.org/en/content/articlelanding/2024/nh/d4nh00049h
Papper original source: Nanoscale Horizons. 9 (8): 1330-1340
APA: Tripathi, M; Deokar, G; Casanova-Chafer, J; Jin, J; Sierra-Castillo, A; Ogilvie, S P; Lee, F; Iyengar, S A; Biswas, A; Haye, E; Genovese, A; Llobet, E (2024). Vertical heterostructure of graphite-MoS2 for gas sensing. Nanoscale Horizons, 9(8), 1330-1340. DOI: 10.1039/d4nh00049h
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Article's DOI: 10.1039/d4nh00049h
Entity: Universitat Rovira i Virgili
Journal publication year: 2024
Publication Type: Journal Publications