Novel Preparation of Reduced Graphene Oxide–Silver Complex using an Electrical Spark Discharge Method
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental System
2.2. Dielectric Fluid and Material
2.3. Principle of Reduction
2.4. Experimental Method
3. Results
3.1. Suspension Stability
3.2. Characterization of rGOAg
4. Discussion
- This new reduction method is a simple process with a short preparation time. This environment-friendly process does not require additional chemical substances.
- According to UV-Vis, XRD, FTIR, and XPS, after GO and the Ag electrode were processed through the ESDM, both AgNP and Ag+ ions were generated, the latter of which was generated via Ag plasma, because the charged Ag atoms of Ag plasma had a strong reducing property, GO was reduced to the rGOAg complex.
- According to the analysis of Zetasizer, the rGOAg complex has a larger zeta potential than GO. Since Ag plasma pyrolyzed GO bulk into GO flakes and generated Ag+ ions during the process, the strong reducing effect stripped away O between the GO bulk layers. Subsequently, rGO flakes covered the AgNP, forming an rGOAg complex with rGO flakes that possessed sufficient functional groups and H2O in the edges. The functional groups and H2O then formed hydrogen bonds, which elevated the suspension and dispersibility of the rGOAg complex.
- The TEM analysis showed that the complete GO was broken into small pieces of rGO flakes, and the AgNP were embedded in rGO flakes with decorated surface function groups. The suspensibility and dispersion of AgNP were enhanced, and rGO coated on the AgNP surface was hydrophobic. In medical treatments, rGOAg is more likely to penetrate through the bacterial cell membrane, thus improving antibacterial ability.
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Pulse Discharge Cycle (Ton:Toff) | Dielectric Fluid | Electrode | Discharge Time | Voltage |
---|---|---|---|---|
30:30 us | GO dispersion in water | Ag | 2 min | 140 V |
Atmospheric pressure | Volume of the dielectric fluid | Purity of the electrode | Diameter of the electrode (Upper/Lower) | Current segment setting |
1 atm | 150 mL | 99.99% | 1/2 mm | 7 IP |
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Tseng, K.-H.; Ku, H.-C.; Tien, D.-C.; Stobinski, L. Novel Preparation of Reduced Graphene Oxide–Silver Complex using an Electrical Spark Discharge Method. Nanomaterials 2019, 9, 979. https://doi.org/10.3390/nano9070979
Tseng K-H, Ku H-C, Tien D-C, Stobinski L. Novel Preparation of Reduced Graphene Oxide–Silver Complex using an Electrical Spark Discharge Method. Nanomaterials. 2019; 9(7):979. https://doi.org/10.3390/nano9070979
Chicago/Turabian StyleTseng, Kuo-Hsiung, Hsueh-Chien Ku, Der-Chi Tien, and Leszek Stobinski. 2019. "Novel Preparation of Reduced Graphene Oxide–Silver Complex using an Electrical Spark Discharge Method" Nanomaterials 9, no. 7: 979. https://doi.org/10.3390/nano9070979