Author, as appears in the article.: Alagh A; Annanouch FE; Sierra-Castillo A; Haye E; Colomer JF; Llobet E
Department: Enginyeria Electrònica, Elèctrica i Automàtica
URV's Author/s: Llobet Valero, Eduard
Keywords: Tungsten diselenide Transition metal dichalcogenide Nitrogen dioxide Gas sensors Gas sensor Chemical vapor deposition Ammonia tungsten diselenide transition metal dichalcogenide temperature performance no2 nitrogen dioxide nanostructures nanoparticles mos2 humidity growth exposure chemical vapor deposition ammonia
Abstract: Herein, we present, for the first time, a chemoresistive-type gas sensor composed of two-dimensional WSe2, fabricated by a simple selenization of tungsten trioxide (WO3) nanowires at atmospheric pressure. The morphological, structural, and chemical composition investigation shows the growth of vertically oriented three-dimensional (3D) assemblies of edge-enriched WSe2 nanoplatelets arrayed in a nanoflower shape. The gas sensing properties of flowered nanoplatelets (2H-WSe2) are investigated thoroughly toward specific gases (NH3 and NO2) at different operating temperatures. The integration of 3D WSe2 with unique structural arrangements resulted in exceptional gas sensing characteristics with dual selectivity toward NH3 and NO2 gases. Selectivity can be tuned by selecting its operating temperature (150 °C for NH3 and 100 °C for NO2). For instance, the sensor has shown stable and reproducible responses (24.5%) toward 40 ppm NH3 vapor detection with an experimental LoD < 2 ppm at moderate temperatures. The gas detecting capabilities for CO, H2, C6H6, and NO2 were also investigated to better comprehend the selectivity of the nanoflower sensor. Sensors showed repeatable responses with high sensitivity to NO2 molecules at a substantially lower operating temperature (100 °C) (even at room temperature) and LoD < 0.1 ppm. However, the gas sensing properties reveal high selectivity toward NH3 gas at moderate operating temperatures. Moreover, the sensor demonstrated high resilience against ambient humidity (Rh = 50%), demonstrating its remarkable stability toward NH3 gas detection. Considering the detection of NO2 in a humid ambient atmosphere, there was a modest increase in the sensor response (5.5%). Furthermore, four-month long-term stability assessments were also taken toward NH3 gas detection, and sensors showed excellent response stability. Therefore, this study highlights the practical application of the 2H variant of WSe2 nanoflower gas sensors for NH3 vapor detection.
Thematic Areas: Química Nanoscience and nanotechnology Nanoscience & nanotechnology Medicine (miscellaneous) Medicina veterinaria Medicina ii Medicina i Materials science, multidisciplinary Materials science (miscellaneous) Materials science (all) Materiais Interdisciplinar General materials science Farmacia Engenharias iv Engenharias iii Engenharias ii Economia Ciências biológicas iii Ciências biológicas ii Ciências biológicas i Ciências ambientais Ciências agrárias i Biotecnología Biodiversidade Astronomia / física Arquitetura, urbanismo e design
licence for use: https://creativecommons.org/licenses/by/3.0/es/
Author's mail: eduard.llobet@urv.cat
Author identifier: 0000-0001-6164-4342
Record's date: 2023-02-19
Papper version: info:eu-repo/semantics/publishedVersion
Link to the original source: https://pubs.acs.org/doi/10.1021/acsami.2c16299
Licence document URL: http://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Acs Applied Materials & Interfaces. 14 (49): 54946-54960
APA: Alagh A; Annanouch FE; Sierra-Castillo A; Haye E; Colomer JF; Llobet E (2022). Three-Dimensional Assemblies of Edge-Enriched WSe2 Nanoflowers for Selectively Detecting Ammonia or Nitrogen Dioxide. Acs Applied Materials & Interfaces, 14(49), 54946-54960. DOI: 10.1021/acsami.2c16299
Article's DOI: 10.1021/acsami.2c16299
Entity: Universitat Rovira i Virgili
Journal publication year: 2022
Publication Type: Journal Publications
Repositori URV