Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 12, Issue 12, Pages 3660-3664Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b207105c
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Chemically modified electrodes based on the incorporation of lichens in a rigid matrix obtained by sol-gel process show higher ruggedness and stability than conventional carbon paste electrodes. The lichen ion-exchange properties in the uptake of metal ions are combined with the improved physical characteristics of the synthesized materials. SEM, EIS and AS-LSV techniques have been applied to characterize the sol-gel/lichen materials and to evaluate their ability in the construction of electrochemical devices. The coating of solid graphite electrodes with the lichen-polysiloxane materials by means of a spin-coating process allows the development of robust electrochemical sensors. Such devices exhibit a long-time stability and a suitable electroanalytical performance in the amperometric determination of heavy metal ions in water samples. The impedancimetric response of the sensor towards sodium ions has been also demonstrated.
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