TY - JOUR
T1 - A self-referenced optical colorimetric sensor based on silver and gold nanoparticles for quantitative determination of hydrogen peroxide
AU - Rivero, Pedro J.
AU - Ibañez, Elia
AU - Goicoechea, Javier
AU - Urrutia, Aitor
AU - Matias, Ignacio R.
AU - Arregui, Francisco J.
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - In this work, a self-referenced colorimetric sensor for the quantitative determination of hydrogen peroxide is presented. This optical sensor is based on the presence of the Localized Surface Plasmon Resonances of silver and gold nanoparticles which are capped with the same encapsulating agent of poly(diallylammonium chloride) (PDDA). These metallic nanoparticles are synthesized by a chemical reduction method of their corresponding inorganic precursors and characterized by UV–vis spectroscopy and transmission electron microscopy, respectively. A remarkable difference in sensitivity related to both LSPR absorption bands is observed as a function of variable molar concentration of the target molecule. The LSPR band of the silver nanoparticles is gradually decreased whereas the LSPR of the gold nanoparticles is practically unaltered when the hydrogen peroxide molar concentration is increased as a result of its better chemical stability. This stable absorbance LSPR band of the AuNPs is used as an optical reference and the molar concentration of the target molecule is obtained by measuring the changes of the absorbance strength maxima of both LSPR absorption bands. As a result, a very good sensitivity with a high robustness and a linear response over a wide concentration range from 1.25 μM to 1250 μM is obtained. This self-referenced method opens up a new perspective for the chemical detection of other reactive oxygen species or well for the determination of other type of analytes in the future.
AB - In this work, a self-referenced colorimetric sensor for the quantitative determination of hydrogen peroxide is presented. This optical sensor is based on the presence of the Localized Surface Plasmon Resonances of silver and gold nanoparticles which are capped with the same encapsulating agent of poly(diallylammonium chloride) (PDDA). These metallic nanoparticles are synthesized by a chemical reduction method of their corresponding inorganic precursors and characterized by UV–vis spectroscopy and transmission electron microscopy, respectively. A remarkable difference in sensitivity related to both LSPR absorption bands is observed as a function of variable molar concentration of the target molecule. The LSPR band of the silver nanoparticles is gradually decreased whereas the LSPR of the gold nanoparticles is practically unaltered when the hydrogen peroxide molar concentration is increased as a result of its better chemical stability. This stable absorbance LSPR band of the AuNPs is used as an optical reference and the molar concentration of the target molecule is obtained by measuring the changes of the absorbance strength maxima of both LSPR absorption bands. As a result, a very good sensitivity with a high robustness and a linear response over a wide concentration range from 1.25 μM to 1250 μM is obtained. This self-referenced method opens up a new perspective for the chemical detection of other reactive oxygen species or well for the determination of other type of analytes in the future.
KW - Hydrogen peroxide detection
KW - Localized surface plasmon resonance (LSPR)
KW - Optical colorimetric sensor
KW - Self-referenced sensor
KW - Silver and gold nanoparticles
UR - https://www.scopus.com/pages/publications/85019886647
U2 - 10.1016/j.snb.2017.05.110
DO - 10.1016/j.snb.2017.05.110
M3 - Article
AN - SCOPUS:85019886647
SN - 0925-4005
VL - 251
SP - 624
EP - 631
JO - Sensors and Actuators B: Chemical
JF - Sensors and Actuators B: Chemical
ER -