Tollen’s reagent assisted synthesis of hollow polyaniline microsphere/Ag nanocomposite and its applications in sugar sensing and electromagnetic shielding
| Autor: | Ritwik Panigrahi, Suneel Kumar Srivastava |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
Materials science
Nanocomposite Polyaniline nanofibers Mechanical Engineering Analytical chemistry Nanoparticle Emulsion polymerization Condensed Matter Physics Silver nanoparticle chemistry.chemical_compound chemistry Chemical engineering Polymerization Mechanics of Materials Reagent Polyaniline General Materials Science |
| Zdroj: | Materials Research Bulletin. 64:33-41 |
| ISSN: | 0025-5408 |
| Popis: | The present study is focused on synthesis of polyaniline hollow microspheres (PnHM) nanocomposites of silver (Ag) i.e., PnHMAg by emulsion polymerization of aniline and Tollen’s reagent as a source for Ag nanoparticles. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analysis of PnHMAg indicated presence of silver nanoparticles dispersed on polyaniline surface. The electrical conductivity of PnHMAg is increased by ∼6 times compared to PnHM. Cyclic voltammogram of PnHM in sugar sensing exhibits characteristics redox peaks at ∼0.09 (sugar) and ∼0.53 V (polyaniline). Interestingly, PnHMAg showed a single peak at ∼−0.18 V with increased intensity (∼5 times) indicating its high sugar sensing ability. PnHMAg also exhibits high shielding efficiency of 19.5 dB (11.2 GHz) due to the presence of highly conducting Ag nanoparticles. TEM studies confirmed that Ag nanoparticles are well distributed on PnHM. As a result, a continuous electronic path is developed due to enhanced interconnectivity of PnHM. |
| Databáze: | OpenAIRE |
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