ebn presentation serena skov campbell - plasmonic aluminium metamaterials (palms) version 2
TRANSCRIPT
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Plasmonic Aluminium Metamaterials (PAlMs): Self-
Assembled Hyperbolic Metamaterials In The Deep UV
Serena Skov Campbell Kings College London 2015
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Overview
• Why are we interested in metamaterials in the deep UV?
• Fabrication methods of aluminium metamaterials
• Preliminary results for electrodeposited thin film aluminium on gold substrates
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Metamaterials in the UV• Biological detection / UV-SERS• Amino acids absorb in the UV – DNA, RNA • Resonant enhancement + surface enhancement• Lower fluorescent background in the UV• Reproducible, label-free, real-time detection• Increased sensitivity
• Observing and controlling photochemical reactions
UV-SERS spectral data for Adenine.
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Aluminium as a plasmonic material in the UV
• Q factor comparison between various metallic materials• Long term sustainability of samples (compared to fx silver)
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Fabrication of Aluminium by electrodeposition • Basic experimental setup• Nernst equation• Ionic Liquid – Acidic AlCl3 solution
Reduction of AlCl3
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Template based fabrication of Aluminium• AAO template• Controlled aspect ratio and morphology
AAO template structure Electrodeposited Al nanorods (Oltean et. al, 2011)
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Height control of electrodeposited nanorods
1. Nucleation pulse (0.4V vs. Al3+/Al)2. Slight fluctuations due to imperfect
conductivity. 3. Pores are filled: surface area increases4. Thin film deposition
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Thin film ED of Aluminium: Results
• ED of Al onto gold substrates• Nucleation effects due to impurities on substrate / deposition time
20x20um area of Au with 23s deposited Al at 0.5V vs. Ref.
Thin film deposition of Aluminium on a gold substrate
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Thin film ED of Aluminium: Results
Deposited Aluminium on gold substrate - Roughness RMS 2.18
Gold substrate - Roughness RMS 1.65 Approx. 10nm Al for 23s deposition. Dep. rate = 0.43nm/s
• Initial results of surface roughness and deposition rate: AFM
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Future research
• Morphology investigations: Aluminium nanodots, nanorings and nanocones.
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Current work• Solution contamination issue• Measure deposition rates on ITO substrates• Optimise the setup to limit variables • AAO on gold substrates – why is this an issue?
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