Self-assembled Optical Diffraction Patterns for Applications in Water Quality Monitoring
| Autor: | Khalid Mahmood Arif, Swapna A. Jaywant, Ebubekir Avci, Johan Potgieter |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
chemistry.chemical_classification
Chemistry Ligand 010401 analytical chemistry Inorganic chemistry chemistry.chemical_element Glutathione 010501 environmental sciences 01 natural sciences 0104 chemical sciences Metal chemistry.chemical_compound visual_art Microcontact printing visual_art.visual_art_medium Thiol Surface modification Arsenic 0105 earth and related environmental sciences Arsenite |
| Zdroj: | ICST |
| Popis: | In this paper, we present a novel method with unique surface modification technique to detect dissolved arsenite contamination of water. It features self-assembled patterns of thiol ligand like glutathione (GSH) on the gold-coated glass. Thiol easily binds with gold through Au-S linkage. In addition to this, As(III) has an affinity towards amino acids, amines, peptides and organic micro-molecules due to As-O or As-S linkages. Hence, GSH binds with gold-coated glass and arsenic. The patterns are obtained through a micro-contact printing (µCP) procedure. When these patterns are exposed to arsenic-contaminated water, the arsenic layer forms on the GSH pattern which produces an optical diffraction grating for the detection system. These self-assembled optical diffraction patterns can detect dissolved arsenite up to 20 µg/L. Our findings suggest that the proposed method can also be used for detection of a variety of other metallic and pathogenic contaminants like E. coli for water Quality monitoring. |
| Databáze: | OpenAIRE |
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