Toward tip-enhanced Raman spectroscopy at the solid/liquid interface Katrin F. Domke, Bruno Pettinger Fritz Haber Institute of the Max Planck Society Department.

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Presentation transcript:

Toward tip-enhanced Raman spectroscopy at the solid/liquid interface Katrin F. Domke, Bruno Pettinger Fritz Haber Institute of the Max Planck Society Department of Physical Chemistry Berlin, Germany

STM and Raman …

… and potential control

Cyclic voltammogram provided by Constanze Donner, Free University Berlin. TERSSLi at potential-controlled surfaces adenine open circuit: V

? Cyclic voltammogram provided by Constanze Donner, Free University Berlin. TERSSLi at potential-controlled surfaces adenine controlled potential

FHI experimental set-up working in air

Problem with old set-up + TERS modified EC-STM refractive indices air: 1 glass: 1.5 water: 1.33 focus too big, no signal glasses don‘t fit, no roomcorrection?

Parabolic-mirror approach electrode potential control parabolic mirror STM tip, insulated for EC measurements sample CE RE in:excitation laser beam out:scattered light 4 mm 16 mm

Optical path fibre in (633 nm) fibre out (multimode) HeNe laser spectrometer beam expander STM head glass plate parabolic mirror

TERSSLi set-up Technical support: Klaus Grabitz

New STM head 500 x 500 nm x 200 nm 2 Pt(111) bead crystal 2 mm diameter crystals prepared by Juan M. Feliu, Alicante, Spain

Si signal in air/water (for comparison: cts/s with old setup)

Tip coating I

Tip coating II

To come … 50 x 50 nm 2 25 x 25 nm 2 Metal organyls: Co(II) porphyrines/toluene at Au(111) flat, well-ordered? nanocrystal? nice focus??