Viral-templated gold/polypyrrole nanopeapods for an ammonia gas sensor
| Autor: | Heng-Chia Su, Chung Hee Moon, Miluo Zhang, Yiran Yan, Elaine D. Haberer, Nosang V. Myung |
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| Rok vydání: | 2016 |
| Předmět: |
Detection limit
Conductive polymer Nanostructure Materials science Mechanical Engineering Inorganic chemistry Bioengineering 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Polypyrrole 01 natural sciences 0104 chemical sciences Ammonia chemistry.chemical_compound chemistry Electrical resistance and conductance Chemical engineering Mechanics of Materials Colloidal gold General Materials Science Electrical and Electronic Engineering 0210 nano-technology Hybrid material |
| Zdroj: | Nanotechnology. 27(32) |
| ISSN: | 1361-6528 |
| Popis: | One-dimensional gold/polypyrrole (Au/PPy) nanopeapods were fabricated using a viral template: M13 bacteriophage. The genetically modified filamentous virus displayed gold-binding peptides along its length, allowing selective attachment of gold nanoparticles (Au NPs) under ambient conditions. A PPy shell was electropolymerized on the viral-templated Au NP chains forming nanopeapod structures. The PPy shell morphology and thickness were controlled through electrodeposition potential and time, resulting in an ultra-thin conductive polymer shell of 17.4 ± 3.3 nm. A post-electrodeposition acid treatment was used to modify the electrical properties of these hybrid materials. The electrical resistance of the nanopeapods was monitored at each assembly step. Chemiresistive ammonia (NH3) gas sensors were developed from networks of the hybrid Au/PPy nanostructures. Room temperature sensing performance was evaluated from 5 to 50 ppmv and a mixture of reversible and irreversible chemiresistive behavior was observed. A sensitivity of 0.30%/ppmv was found for NH3 concentrations of 10 ppmv or less, and a lowest detection limit (LDL) of 0.007 ppmv was calculated. Furthermore, acid-treated devices exhibited an enhanced sensitivity of 1.26%/ppmv within the same concentration range and a calculated LDL of 0.005 ppmv. |
| Databáze: | OpenAIRE |
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