Mid-infrared gas sensing using graphene plasmons tuned by reversible chemical doping
10.1021/acsphotonics.9b01714
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/368801
Tipus de documentArticle
Data publicació2020-04-15
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
Highly confined plasmon modes in nanostructured
graphene can be used to detect tiny quantities of biological and gas
molecules. In biosensing, a specific biomarker can be concentrated
close to graphene, where the optical field is enhanced, by using an
ad-hoc functional layer (e.g., antibodies). Inspired by this
approach, in this paper we exploit the chemical and gas adsorption
properties of an ultrathin polymer layer deposited on a
nanostructured graphene surface to demonstrate a new gas sensing
scheme. A proof-of-concept experiment using polyethylenimine
(PEI) that is chemically reactive to CO2 molecules is presented.
Upon CO2 adsorption, the sensor optical response changes because of PEI vibrational modes enhancement and shift in plasmon
resonance, the latter related to polymer-induced doping of graphene. We show that the change in optical response is reversed during
CO2 desorption. The demonstrated limit of detection (LOD) of 390 ppm corresponds to the lowest value detectable in ambient
atmosphere, which can be lowered by operating in vacuum. By using specific adsorption polymers, the proposed sensing scheme can
be easily extended to other relevant gases, for example, volatile organic compounds.
CitacióBareza, N. [et al.]. Mid-infrared gas sensing using graphene plasmons tuned by reversible chemical doping. "ACS photonics", 15 Abril 2020, vol. 7, núm. 4, p. 879-884.
ISSN2330-4022
Versió de l'editorhttps://pubs.acs.org/doi/10.1021/acsphotonics.9b01714
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acsphotonics.9b01714.pdf | 2,099Mb | Visualitza/Obre |