In situ reduced graphene-based aerogels embedded with gold nanoparticles for real-time humidity sensing and toxic dyes elimination
| Autor: | Israt Ali, Syeda Wishal Bokhari, Hitler Louis, M. Zubair Iqabl, Riaz Hussain |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Dispersity Acrylic Resins Nanochemistry Nanoparticle Metal Nanoparticles Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Analytical Chemistry law.invention law Porosity Coloring Agents Density Functional Theory chemistry.chemical_classification Graphene Water Aerogel Humidity Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Methylene Blue chemistry Models Chemical Colloidal gold Graphite Gold 0210 nano-technology Gels Water Pollutants Chemical |
| Zdroj: | Mikrochimica acta. 188(1) |
| ISSN: | 1436-5073 |
| Popis: | Hybrid aerogels are promising candidates for energy storage, biosensing, and medical applications, but the conventional fabrication methods, being time-consuming and complex, limit their widespread utilization. The critical issues affecting their functionality include the un-controllable particle dispersity, loading of active materials, and the porosity. We report a simple and efficient method to synthesize in situ reduced Au nanoparticles@graphene (Au@graphene) hybrid aerogel using near-infrared radiation (NIR), resulting the uniform loading of well-dispersed Au nanoparticles (Au-NPs) as well as in situ reduction of graphene oxide (GO) with enhanced conductivity. The concentration of iso-propylacrylamide and GO can be adjusted to control the aerogel pore size during the freeze-drying process. Reduction of HAuCl4 and GO to high extent under NIR light was confirmed with advanced characterization techniques. Density functional theory based calculations with generalized gradient-corrected functional (GGA/PW91) in the hybrid aerogel system, and dnd basis sets are used for the confirmation of possible interactions between the GO, Au-NPs, and the polymer. The as-designed highly porous and conductive aerogel shows an excellent humidity response (30–97%) and successfully removes the methylene blue pollutant from the aqueous solution to a high extent (90%). Therefore, Au@graphene hybrid aerogel is potentially an exciting candidate for a wide range of applications in the humidity sensing and biomedical disease detection. |
| Databáze: | OpenAIRE |
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