Interest in gas sensing using functionalised carbon nanotubes is a major area of research that utilises changes in their electrical properties induced by the reaction with a specific gas. This paper describes specific gas sensing on an optical platform consisting of a 2-dimensional nano-structured plasmonic array of nano-antennae/nanowires, with topological dimensions of mean radius of 130nm, typical length of 20μm and a period of 500nm. The array is created by the spatial compaction of germanium oxides when the material interacts with ultra-violet irradiance, it can support infra-red localised surface plasmons. Carbon nanotubes are deposited upon the surface of the plasmonic platform followed by the application of the polyethyleneimine polymer. The resulting nanomaterials–photonic platform gives rise to the selective response to nitrous oxide gases, which are a major contributor to atmospheric degradation. We achieve the device sensitivity up to 100% atmosphere of nitrous oxide with a detection limit of 109ppm, a maxiumum response time of nineteen seconds and yielding a full-scale deflection of +5.7nm. This work demonstrates that the optical properties of specific carbon nanotubes can be used in a wide range of sensing applications offering a new sensing paradigm.
|Number of pages||12|
|Early online date||16 Sept 2020|
|Publication status||Published - Oct 2020|
Bibliographical noteThis article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Funding: EPSRC (EP/J010413 and EP/J010391) for Aston University and the University of Plymouth along with the University of Hull prosperity partnership EPSRC (EP/R004900/1); Marie Skłodowska-Curie COFUND Action MULTIPLY (project 713694) and the Spanish MICINN Grant ECOSYSTEM (RTI2018-097957-B-C33); Royal Academy of Engineering/Leverhulme Trust Senior Research Fellowships (LTSRF1617/13/57) and EU Horizon 2020 Research and Innovation Staff Exchange Programme (RISE) under Marie Sklodowska-Curie Action (project 690945 “Carther”)