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Vol. 34, No. 8(3), S&M3042

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Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Sensors and Materials, Volume 28, Number 3 (2016)
Copyright(C) MYU K.K.
pp. 181-190
S&M1168 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2016.1260
Published: March 30, 2016

Optical Gas Sensing Using Gold Nanoparticles/Polyelectrolyte Layer-by-Layer Films: A Case Study with Poly(acrylic acid) for Ammonia Detection [PDF]

Tao Wang, Takuya Okada, Kenshi Hayashi, Stephen W. James, and Seung-Woo Lee

(Received October 13, 2015; Accepted November 26, 2015)

Keywords: gold nanoparticles, surface plasmon resonance (SPR), ammonia, polyelectrolyte, layer-bylayer (LbL) deposition

In this study, we demonstrated a new approach for gas sensing using multilayer films self-assembled with cationic gold nanoparticles (AuNPs+) and anionic polyelectrolytes via layer-by-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 self-assembled 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.

Corresponding author: Seung-Woo Lee


Cite this article
Tao Wang, Takuya Okada, Kenshi Hayashi, Stephen W. James, and Seung-Woo Lee, Optical Gas Sensing Using Gold Nanoparticles/Polyelectrolyte Layer-by-Layer Films: A Case Study with Poly(acrylic acid) for Ammonia Detection, Sens. Mater., Vol. 28, No. 3, 2016, p. 181-190.



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