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Silver Nanoparticles Anchored on Single-Walled Carbon Nanotubes via a Conjugated Polymer for Enhanced Sensing Applications.
| Content Provider | Europe PMC |
|---|---|
| Author | Ding, Jianfu Li, Zhao Kodra, Oltion Couillard, Martin Ouyang, Jianying Lapointe, François Malenfant, Patrick R. L. |
| Copyright Year | 2023 |
| Abstract | Single-walled carbon nanotubes (SWCNTs) are candidatematricesfor loading metal nanoparticles (NPs) for sensor and catalytic applicationsowing to their high electron conductivity and mechanical strength,larger surface area, excellent chemical stability, and ease of surfacemodification. The performance of the formed NP/SWCNT composites isdependent on the NP size, the physical and chemical interactions betweenthe components, and the charge transfer capabilities. Anchoring metalcomplexes onto the surface of SWCNTs through noncovalent interactionsis a viable strategy for achieving high-level metal dispersion andhigh charge transfer capacities between metal NPs and SWCNTs. However,traditional metal complexes have small molecular sizes, and theirnoncovalent interactions with SWCNTs are limited to provide excellentsensing and catalytic capability with restricted efficiency and durability.Here, we selected poly(9,9-di-n-dodecylfluorenyl-2,7-diyl-alt-2,2′-bipyridine-5,5′) (PFBPy) to increasethe noncovalent interactions between silver nanoparticles (AgNPs)and SWCNTs. A silver triflate (Ag–OTf) solution was addedinto a PFBPy-wrapped SWCNT solution to form Ag–PFBPy complexeson the nanotube surface, after which Ag+ was photoreducedto AgNPs to form a Ag–PFBPy/SWCNT composite in the solution.In various feeding molar ratios of Ag–OTf over the BPy unit(0.4–50), the size of the formed AgNPs may be well-controlledat sub-nm levels to provide them with an energy level comparable tothat of the SWCNTs. Additionally, the 2,2′-bipyridine (BPy)unit of the polymer provided a coordinating interaction with Ag+ and the formed AgNPs as well. The 5,5′-linage of BPywith the fluorene unit in PFBPy ensured a straight main chain structureto retain strong π–π interactions with nanotubesbefore and after Ag+ chelation. All of these factors confirmeda tight contact between the formed AgNPs and SWCNTs, promoting thecharge transfer between them and enhancing the sensing capabilitieswith a 5-fold increase in humidity sensing sensitivity. |
| Journal | ACS Omega |
| Volume Number | 8 |
| PubMed Central reference number | PMC10116552 |
| Issue Number | 15 |
| PubMed reference number | 37091384 |
| e-ISSN | 24701343 |
| DOI | 10.1021/acsomega.3c01127 |
| Language | English |
| Publisher | American Chemical Society |
| Publisher Date | 2023-04-05 |
| Access Restriction | Open |
| Rights License | Permits the broadest form of re-use including for commercial purposes, provided that author attribution and integrity are maintained (https://creativecommons.org/licenses/by/4.0/). Crown © 2023. Published by American Chemical Society |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering |
