Chemoresistive and photonic hydrogel sensors of transition metal ions via Hofmeister series principles

[Display omitted] •Hydrogels provide a chemoresistive and photonic response for ion sensing and removal applications.•Study includes 11 different transition metal ions with approximately 100ppb detection limits.•Quantitative and robust detection with Rsquare values of 0.99.•Hofmeister Series Princip...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2018-03, Vol.256, p.870-877
Main Authors: Price, Capri, Carroll, James, Clare, Tami L.
Format: Article
Language:English
Subjects:
Cobalt
Colorimetry
Conductivity
Coordination compounds
Copolymerization
Copper
Electrochemical impedance spectroscopy
Gels
Hydrogel
Hydrogels
Ion concentration
Lead
Manganese ions
Metal ions
Metals
Photonics
Polyacrylic acid
Polymer swelling
Polymers
Prussian blue
Raman spectroscopy
Sensor
Sensors
Silver
Sorbents
Sulfonic acid
Tin
Transition metal
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Summary:[Display omitted] •Hydrogels provide a chemoresistive and photonic response for ion sensing and removal applications.•Study includes 11 different transition metal ions with approximately 100ppb detection limits.•Quantitative and robust detection with Rsquare values of 0.99.•Hofmeister Series Principles and their effect on viscosity are used to explain the gels’ responses. We evaluate the sensory response of hydrogels composed of polyacrylic acid (PAA) co-polymerized with acrylamido-methyl propane sulfonic acid (AMPS) exposed to eleven different transition metal ions, which were reacted with hexacyanoferrate ions. Trends in the chemoresistive responses of the gels to ions of Cu2+, Fe2+, Mn2+, Ni2+, Pb2+, Co2+, Sn2+, Cd2+, Zn2+, Mo5+, and Ag+ due to the formation of metal hexacyanoferrate complexes are shown to depend upon the strength of the gel headgroup-ion interactions based on the Hofmeister series and confirmed using Raman spectroscopy. These hydrogels either showed a decrease in resistivity and swelling with increasing ion concentration or the opposite effect. Sensitivity by colorimetric and conductivity measurements was approximately 100ppb, which can be adjusted by the gel’s dimensions and density of headgroups within the gel. The photonic and vibrational characteristics of the gels upon ion addition were investigated for use in spectroelectrochemical sensing devices by imaging, electrochemical impedance spectroscopy and Raman spectroscopy.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2017.10.031