Optical gas sensing using gold nanoparticles/polyelectrolyte layer-by-layer films: a case study with poly(acrylic acid) for ammonia detection

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dc.contributor.authorWang, Tao
dc.contributor.authorOkada, Takuya
dc.contributor.authorHayashi, Kenshi
dc.contributor.authorJames, Stephen W.
dc.contributor.authorLee, Seung-Woo
dc.date.accessioned2016-08-16T13:44:19Z
dc.date.available2016-08-16T13:44:19Z
dc.date.issued2016-03-30
dc.description.abstractthis study, we demonstrated a new approach for gas sensing using multilayer films selfassembled with cationic gold nanoparticles (AuNPs+) and anionic polyelectrolytes via layerby- layer (LbL) deposition. The surface of AuNPs+ was modified with a cationic disulfide, [–S(CH2)2NHCO(CH2)10(CH3)3N+Br−]2. Two types of LbL film using AuNPs+ were selfassembled with anionic polyelectrolytes, poly(acrylic acid) (PAA), and poly(sodium 4-styrene sulfonate) (PSS) on quartz substrates, and their film growth was confirmed by UV–vis measurements. The 10-cycle AuNPs+/PAA film showed reproducible responses after exposure to ammonia gas (3000 ppm) and HCl treatment (0.1 M), showing absorbance changes of 0.0428 ± 0.0033 at 299 nm and 0.0053 ± 0.0013 at 544 nm for five repeated tests. On the other hand, no significant changes were observed for the 10-cycle AuNPs+/PSS film. Ammonia binding was based on the acid–base interaction between ammonia and the free carboxylic acid groups of PAA. The film's composition and morphology were also investigated by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM) measurements to clarify the sensing mechanism.en_UK
dc.identifier.citationTao Wang, Takuya Okada, Kenshi Hayashi, Stephen W. James and Seug-Woo Lee. Optical gas sensing using gold nanoparticles/polyelectrolyte layer-by-layer films: a case study with poly(acrylic acid) for ammonia detection. Sensors and Materials, Vol. 28. No3. (2016) pp181-190en_UK
dc.identifier.issn0914-4935
dc.identifier.urihttp://dx.doi.org/10.18494/SAM.2016.1168
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/10320
dc.language.isoenen_UK
dc.publisherScientific Publishing Division Myuen_UK
dc.subjectgold nanoparticlesen_UK
dc.subjectsurface plasmon resonance (SPRen_UK
dc.subjectammoniaen_UK
dc.subjectpolyelectrolyteen_UK
dc.subjectlayer-bylayer (LbL) depositionen_UK
dc.titleOptical gas sensing using gold nanoparticles/polyelectrolyte layer-by-layer films: a case study with poly(acrylic acid) for ammonia detectionen_UK
dc.typeArticleen_UK

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