Reduction Potential of Red Light-Emitting Si NPs

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Presentation transcript:

Reduction Potential of Red Light-Emitting Si NPs Teagan Neal Dr. Andrea Goforth Summer 2013

Overview General Background Objective & Project Background Methods & Experimentation Results Future Work

Background Bulk Si: Indirect bandgap Cheap Abundant Has an indirect band gap Indirect bandgap (Manhat, Beth; p.24)

Project objectives Use red fluorescent Si NPs to reduce metals Find where conduction and valence bands lie in Si NPs Si0 Bulk Au3+  Au0 Red Si NPs ∆E

Project Background Work previously done Particles synthesized have Si core surrounded by SiOx shell. Proposed Model: Si SiOx

Reduction Reaction Oxidation Au Si SiOx + HAuCl4(aq)  + Reduction

Methods Photoluminescence (PL) Spectroscopy UV-Visible (UV-Vis) Spectroscopy X-Ray Diffraction (XRD) Transmission Electron Microscopy (TEM) Energy Dispersive X-Ray (EDX)

Experimental Setup Light Reduction Chamber UV Lamp (365 nm) Irradiate sample for 1 hour: 2min x5 5min x4 15min x2 UV-Vis and PL spectroscopy between each interval

Gold Chloroauric Acid + Red Si NPs 0.2 mL HAuCl4 + 0.8 mL Si NP 10mM (left) and 15mM (right) Solutions after being irradiated Chloroauric Acid + Red Si NPs 0.2 mL HAuCl4 + 0.8 mL Si NP Trials using: Si NPs in ethanol and nanopure water Si NPs in ONLY nanopure water or ONLY ethanol With and without intense UV irradiation

Au NP Plasmon HAuCl4 UV-Vis Si NPs PL

Gold Results

X-Ray Diffraction

TEM & EDX TEM Image from sample using 15mM HAuCl4 + 5% Si NPs (in EtOH/nH2O)

Using Nanopure Water

Using Ethanol

What next? Different surfactants/capping agents to control NP size. Further experimentation with silver. Reduce organic molecules. Remove SiOx shell

Acknowledgments Dr. Andrea Goforth Sheng Kuei Chiu Goforth Lab Dr. Jun Jiao & Dr. Erik Sánchez Deborah Lee National Science Foundation Portland State University Center for Electron Microscopy & Nanofabrication

Questions?

References Manhat, Beth. “Fluorescent Semiconductor Nanomaterials for Biological Applications.” Powerpoint Presentation. Portland State University, Portland, OR, 30 Oct 2012.