Abstract
Pd nanoparticles were fabricated on graphene oxide (GO) using a deposition-precipitation method with a glow discharge plasma reduction at room temperature. Argon was employed as the plasma-generating gas. The novel plasma method selectively reduces the metal ions. The graphene oxide has no change with this plasma reduction according to the Fourier transform infrared analysis. The Pd nanoparticles on the GO were uniformly distributed with an average diameter of 1.6 nm. The functional groups on the GO not only prevent Pd nanoparticles from further aggregation but also provide a strong hydrophilic property to the Pd/GO composite, which can form stable colloidal dispersions in water.
Highlights
Graphene oxide (GO) is a highly oxidized layered graphene-based material with a large surface area and various functional groups such as -OH, -COOH, etc. [1,2,3,4]
After 24 h of aging and the plasma reduction, particles were found mostly on the mica substrate and not on the GO, which means that Pd2+ ions would not link with functional groups on GO at pH 4
Increasing the pH to 6 (Figure 1c,f) led to the formation of uniformly distributed fine particles anchored on GO substrates without free particles on mica substrates
Summary
Graphene oxide (GO) is a highly oxidized layered graphene-based material with a large surface area and various functional groups such as -OH, -COOH, etc. [1,2,3,4]. GO can be well dispersed in aqueous solutions due to the hydrophilic functional groups. It is a challenge to reduce metal precursors on GO because GO is reduced with conventional reduction using NaBH4, N2H4 and ethylene glycol or irradiation method (microwave and laser pulse). We present a new fabrication method of Pd/GO composites using the room temperature glow discharge plasma reduction, which has been demonstrated to be a good strategy to reduce noble metal ions into nanoparticles [7,8,9,10,11]. The glow discharge plasma was shown not to affect the GO substrate. In order to maximize the loading efficiency and achieve high dispersion of Pd metal, deposition-precipitation was carried out to
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