Incorporation of Metallic Nanoparticles into Conducting Polymer Actuator Films

Costa, Alexsandro Santos; Li, Kwong-Chi; Kilmartin, Paul A.; Travaš-Sejdić, Jadranka

doi:10.1063/1.3203216

Cited by 1 publication

(2 citation statements)

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“…To this end, many different ions are used, such as hydrogen, alkali ions, and argon . In choosing a specific ion for implantation, for example, platinum (Pt) ions, enhanced characteristics of the PPy films may be targeted, for example, conductivity, , catalytic activity, , and biosensing abilities . Implantation allows for incorporation of conducting, metal Pt particles permanently within the PPy framework without the requirement of reducing agent.…”

Section: Introductionmentioning

confidence: 99%

“…With control over the implantation fluence, the amount of noble metal implanted can be selected. It has been shown that a higher concentration of metal ions (gold) ensures close proximity between the particles as well as larger sizes of metal clusters (in polydimethylsiloxane (PDMS)), which in turn influence electrical contact across the film and hence conductivity . Similarly, here, inclusion of Pt within the film is investigated for the first time using ion implantation methodology and is expected to enhance PPy conductivity with only a small amount of noble metal implantation demonstrating a benefit over full Pt or impregnated Pt surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the Conductivity of Polypyrrole Films Using Low-Energy Platinum Ion Implantation

et al. 2012

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Low-energy platinum ions were implanted with 15 keV under normal incidence into synthesized conducting polymer films with the aim to improve film conductivity and to demonstrate the use of implanted platinum in a simple sensing design. Conductivity measurements, cyclic voltammetry, and Raman spectroscopy were performed on samples both before and following ion implantation. Results display an optimum fluence of ion implantation for which polypyrrole films implanted with 2 × 1016 at. cm–2 display and retain enhanced conductivity compared with nonimplanted samples. X-ray photoelectron spectroscopy (XPS) and scanning electron microscope–energy-dispersive X-ray spectroscopy (SEM-EDS) confirmed that implanted platinum is present mainly as Pt0 and indicated that the depth and amount of ion implantation are in agreement with a simulated implantation profile. Raman spectroscopy showed a surface-enhanced Raman spectroscopy (SERS) effect with platinum’s presence. The advantageous increase in conductivity can be rationalized by two chemical modifications to the polymer upon high-fluence implantation: (1) an increase in the number of charge carriers (dications) within the polymer and (2) the presence of elemental platinum metal and its synergistic effect on conductivity. A simple DNA sensor was constructed on the basis of polypyrrole/Pt0 films where Pt0 was able to serve as anchoring points for DNA attachment as well as an enhancer of the film’s conductivity. This enabled a DNA sensor capable of successful detection of cDNA, and a good discrimination of noncDNA, thus opening a way to direct electrochemical biosensing on the basis of ion implanted highly conducting polymer films.

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