approved final draft Tim Rose Poster Plasmonic Nano-particles for Energy MR
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Next-Generation Materials for Plasmonics & Organic Spintronics Department of Chemistry and Materials Science and Engineering The University of Utah Tim Rose, Michelle Rasmussen, and Shelley D. Minteer Plasmonic Nanoparticles for Energy INTRODUCTION OBJECTIVE • Plasmonic nanoparticles scatter light which increases efficiency. • A thin layer (about two (2) μm) theoretically increases the plasmonic effect. • The plasmonic surface resonance frequency (PSRF) is where the plasmonic effect is at a maximum. • Ag-Au’s PSRF is about 619 THz which is in the visible range. MATERIALS & METHODS • We consistently see the current and power density approximately triple when the LSV is run in the light showing that Ag-Au plasmonic nanoparticles on glassy carbon electrodes act well in a solar cell. • Dramatic current density increases are observed compared to the blanks and controls. RESULTS & CONCLUSIONS FUTURE DIRECTIONS • Determine the cause and mechanism by which this phenomenon is observed. • For example, quantitative chemical analysis of the basic glycerol solution after producing current under various voltages would reveal if ROS were indeed involved. • Irradiating only light with the precise plasmonic surface resonance frequency of the Ag-Au nanoparticles would aid in elucidating the effect of plasmonics. • Formulating methods for further increasing current output. REFERENCES & CREDITS 1. Lin, H. F.; Liao, S. C.; Hung, S. W. The DC Thermal Plasma Synthesis of ZnO Nanoparticles for Visible-Light Photo-catalyst. J. Photochem. Photobiol. A: Chem 2005, 174, 82-87. 2. F. Hasche, M. Oezaslan, P. Strasser, Activity, stability and degradation of multi-walled carbon nanotube (mwcnt) supported pt fuel cell electrocatalysts, Phys. Chem. Chem. Phys. 12 (2010) 15251–15258. 3. Misawa, Masaki; Takahashi, Junko Generation of reactive oxygen species induced by gold nanoparticles under x-ray and UV Irradiations DOI: 10.1016/j.nano.2011.01.014 4. www.erbium.nl 5. http://gregemmerich.wordpress.com/ 6. www.triadsci.com ACKNOWLEDGEMENTS The University of Utah MRSEC Program would like to thank The National Science Foundation for its generous funding. SIGNIFICANCE Principal Investigator: Shelley Minteer NSRF DMR 11-21252; www.mrsec.Utah.edu Figure 1. Electrons in plasmonic metals respond to an applied electric field to produce a plasmon. 4. Figure 2. Light absorption is increased by nanoparticle s activated at their plasmonic surface resonance frequency. 5. • Plasmons are oscillations in the electron cloud of metals. • If photons of the right frequency produce plasmons in a material, then it is considered plasmonic. . The objective is to affirm the hypothesis that Ag-Au plasmonic nanoparticles on glassy carbon electrodes show enhanced performance in a solar fuel cell exposed to light. Though speculated, this work does not attempt to determine the mechanism that is responsible for the result. This work is preliminary to those types of future directions. • Reactive oxygen species (ROS) are produced by nanoparticles. • ROS break down organic molecules like glycerol. • Five (5) μL of nanoparticles in 5% ionomer applied to each glassy carbon electrode (12.5 mg/mL) • 0.1 M glycerol and 0.1 M NaOH for anode compartment • Pt cathode for O 2 reduction in 0.1 M pH 5.5 citrate buffer • Nafion proton exchange membrane Figure 4. The peak at 485 nm verifies that our Ag-Au nanoparticles are plasmonic with a corresponding plasmonic surface resonance frequency in the visible light range (about 619 THz) • Incorporating plasmonic nanoparticles provides an increase in performance of a potential source of clean energy. • The fuel (glycerol) will be inexpensive seeing as up to 350,000 tons of surplus glycerol are wasted in the U.S. annually. 2. Figure 5. The fuel cell set up. Figure 7. As part of a future work, an HPLC, for example, could be used to help determine the role of ROS because it will elucidate the concentrations of the different oxidation products of glycerol that are formed at various potentials. 6. Figure 3. Gold nanoparticle s may generate ROS. 3. 0 150 300 450 600 750 900 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 Voltage, V Currentdensity, A/cm 2 0 10 20 30 40 50 60 70 80 Power density, W /cm 2 Figure 6. Solid lines are power density curves and dashed lines are polarization curves. Red is in the presence of light and black is in the dark. (a) Nanoparticles and glycerol. (b) Glycerol but no nanoparticles. (control) (c) Nano-particles but no glycerol. (blank) (a ) (b ) (c )
Transcript of approved final draft Tim Rose Poster Plasmonic Nano-particles for Energy MR
Next-Generation Materials forPlasmonics & Organic Spintronics
Department of Chemistry and Materials Science and EngineeringThe University of Utah
Tim Rose, Michelle Rasmussen, and Shelley D. MinteerPlasmonic Nanoparticles for Energy
INTRODUCTION OBJECTIVE
• Plasmonic nanoparticles scatter light which increases efficiency.
• A thin layer (about two (2) μm) theoretically increases the plasmonic effect.
• The plasmonic surface resonance frequency (PSRF) is where the plasmonic effect is at a maximum.
• Ag-Au’s PSRF is about 619 THz which is in the visible range.
MATERIALS & METHODS
• We consistently see the current and power density approximately triple when the LSV is run in the light showing that Ag-Au plasmonic nanoparticles on glassy carbon electrodes act well in a solar cell.
• Dramatic current density increases are observed compared to the blanks and controls.
RESULTS & CONCLUSIONS FUTURE DIRECTIONS
• Determine the cause and mechanism by which this phenomenon is observed.
• For example, quantitative chemical analysis of the basic glycerol solution after producing current under various voltages would reveal if ROS were indeed involved.
• Irradiating only light with the precise plasmonic surface resonance frequency of the Ag-Au nanoparticles would aid in elucidating the effect of plasmonics.
• Formulating methods for further increasing current output.
REFERENCES & CREDITS1. Lin, H. F.; Liao, S. C.; Hung, S. W. The DC Thermal Plasma Synthesis of ZnO Nanoparticles for Visible-Light Photo-catalyst. J. Photochem. Photobiol. A: Chem 2005, 174, 82-87. 2. F. Hasche, M. Oezaslan, P. Strasser, Activity, stability and degradation of multi-walled carbon nanotube (mwcnt) supported pt fuel cell electrocatalysts, Phys.Chem. Chem. Phys. 12 (2010) 15251–15258.3. Misawa, Masaki; Takahashi, Junko Generation of reactive oxygen species induced by gold nanoparticles under x-ray and UV Irradiations DOI: 10.1016/j.nano.2011.01.0144. www.erbium.nl5. http://gregemmerich.wordpress.com/6. www.triadsci.com
ACKNOWLEDGEMENTSThe University of Utah MRSEC Program would like to thank The National Science Foundation for its generous funding.
SIGNIFICANCE
Principal Investigator: Shelley MinteerNSRF DMR 11-21252; www.mrsec.Utah.edu
Figure 1. Electrons in plasmonic metals respond to an applied electric field to produce a plasmon. 4.
Figure 2. Light absorption is increased by nanoparticles activated at their plasmonic surface resonance frequency. 5.
• Plasmons are oscillations in the electron cloud of metals.
• If photons of the right frequency produce plasmons in a material, then it is considered plasmonic.
.
The objective is to affirm the hypothesis that Ag-Au plasmonic nanoparticles on glassy carbon electrodes show enhanced performance in a solar fuel cell exposed to light. Though speculated, this work does not attempt to determine the mechanism that is responsible for the result. This work is preliminary to those types of future directions.
• Reactive oxygen species (ROS) are produced by nanoparticles.
• ROS break down organic molecules like glycerol.
• Five (5) μL of nanoparticles in 5% ionomer applied to each glassy carbon electrode (12.5 mg/mL)
• 0.1 M glycerol and 0.1 M NaOH for anode compartment• Pt cathode for O2 reduction in 0.1 M pH 5.5 citrate
buffer• Nafion proton exchange membrane
Figure 4. The peak at 485 nm verifies that our Ag-Au nanoparticles are plasmonic with a corresponding plasmonic surface resonance frequency in the visible light range (about 619 THz)
• Incorporating plasmonic nanoparticles provides an increase in performance of a potential source of clean energy.
• The fuel (glycerol) will be inexpensive seeing as up to 350,000 tons of surplus glycerol are wasted in the U.S. annually.2.
Figure 5. The fuel cell set up.
Figure 7. As part of a future work, an HPLC, for example, could be used to help determine the role of ROS because it will elucidate the concentrations of the different oxidation products of glycerol that are formed at various potentials.6.
Figure 3. Gold nanoparticles may generate ROS. 3.
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Figure 6. Solid lines are power density curves and dashed lines are polarization curves. Red is in the presence of light and black is in the dark. (a) Nanoparticles and glycerol. (b) Glycerol but no nanoparticles. (control) (c) Nano-particles but no glycerol. (blank)
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