Towardtip-enhanced Raman spectroscopy
at the solid/liquid interface
Katrin F. Domke, Bruno Pettinger
Fritz Haber Institute of the Max Planck SocietyDepartment of Physical Chemistry
Berlin, Germany
-1.2 -0.8 -0.4 0.0 0.4
-2
-1
0
1
**
physisorbed phasechemisorbed phase
E / V vs. Ag/Ag+
j /
cm-2
Cyclic voltammogram provided by Constanze Donner, Free University Berlin.
TERSSLi at potential-controlled surfaces
adenineopen circuit: -0.08 V
?-1.2 -0.8 -0.4 0.0 0.4
-2
-1
0
1
**
Cyclic voltammogram provided by Constanze Donner, Free University Berlin.
TERSSLi at potential-controlled surfaces
adeninecontrolled potential
Problem with old set-up
+TERS modified EC-STM
refractive indicesair: 1
glass: 1.5water: 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 beamout:scattered light
4 mm
16 mm
Optical path
fibre in (633 nm)
fibre out (multimode)HeNelaser
spectrometer
beam expander
STM head
glass plate
parabolic mirror
New STM head
500 x 500 nm2
200 x 200 nm2
Pt(111) bead crystal2 mm diameter
crystals prepared byJuan M. Feliu, Alicante, Spain