Author, as appears in the article.: Casanova-Chafer, Juan; Umek, Polona; Acosta, Selene; Bittencourt, Carla; Llobet, Eduard
Department: Enginyeria Electrònica, Elèctrica i Automàtica
URV's Author/s: Casanova Chafer, Juan / Llobet Valero, Eduard
Keywords: Xps X ray spectroscopy X ray photoelectron spectroscopy Trace-level detection Synthesis (chemical) Surface functionalization Stability Sensors Room-temperature conditions Room temperature Relative abundance Polypyrroles Polypyrrole nanoparticles Polymers Physicochemical properties Nanoparticles Material characterizations Long term stability Limit of detection Graphene Gases Gas-sensing properties Gas sensor Gas detectors Films Evolution Electronic properties Electronic assessment Degradation Chemo-resistive gas sensors Chemical sensors Chemical detection Band-structure Ammonia detection Ammonia Ambient monitoring Air-quality Air quality
Abstract: The outstanding versatility of graphene for surface functionalization has been exploited by its decoration with synthesized polypyrrole (PPy) nanoparticles (NPs). A green, facile, and easily scalable for mass production nanocomposite development was proposed, and the resulting PPy@Graphene was implemented in chemoresistive gas sensors able to detect trace levels of ammonia (NH3) under room-temperature conditions. Gas exposure for 5 min revealed that the presence of nanoparticles decorating graphene entail greater sensitivity (13-fold) in comparison to the bare graphene performance. Noteworthy, excellent repeatability (0.7% of relative error) and a low limit of detection of 491 ppb were obtained, together with excellent long-term stability. Besides, an extensive material characterization was conducted, and vibration bands obtained via Raman spectroscopy confirmed the formation of PPy NPs, while X-ray spectroscopy (XPS) revealed the relative abundance of the different species, as polarons and bipolarons. Additionally, XPS analyses were conducted before and after NH3 exposure to assess the PPy aging and the changes induced in their physicochemical and electronic properties. Specifically, the gas sensor was tested during a 5-month period, demonstrating significant stability over time, since just a slight decrease (11%) in the responses was registered. In summary, the present work reports for the first time the use of PPy NPs decorating graphene for gas-sensing purposes, revealing promising properties for the development of unattended gas-sensing networks for monitoring air quality.
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: juan.casanova@urv.cat eduard.llobet@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.acs.org/doi/10.1021/acsami.1c10559
Licence document URL: https://repositori.urv.cat/ca/proteccio-de-dades/
Papper original source: Acs Applied Materials & Interfaces. 13 (34): 40909-40921
APA: Casanova-Chafer, Juan; Umek, Polona; Acosta, Selene; Bittencourt, Carla; Llobet, Eduard (2021). Graphene Loading with Polypyrrole Nanoparticles for Trace-Level Detection of Ammonia at Room Temperature. Acs Applied Materials & Interfaces, 13(34), 40909-40921. DOI: 10.1021/acsami.1c10559
Article's DOI: 10.1021/acsami.1c10559
Entity: Universitat Rovira i Virgili
Journal publication year: 2021
Publication Type: Journal Publications
Repositori URV