Annual Report 2007 - The Australian Nanotechnology Network

Ru-Low Mol. Wt. PMAS Ru-High Mol. Wt. PMAS
Figure 1: FLIM images of Ru in thin films containing either LMWT PMAS (right) or HMWT PMAS
(left).
Intensity (A.U.)
1800
1600
1400
1200
1000
800
600
400
200
Composite τ 1 ns τ 2 ns
[Ru(bpy) 2 (PVP) 10 ] 2+ [Ru(bpy) 2 (PVP) 10 ] 240 -
2+ [Ru(bpy) 2 (PVP) 10 ] 240 -
2+
[Ru(bpy) 2 (PVP) 10 ] 2+ 240 -
Ru-LMWT PMAS 220 36
Ru-HMWT PMAS 190
Ru-Nafion 210 22
0
8
7.5
7
6.5
6
5.5
5
4.5
4
3.5
0 20 40 60 80 100
Time ns
0 500 1000 1500 2000 2500
Time (ns)
Figure 2: FLIM images of RuLMWT PMAS and subsequent emission decay profiles and τ values for data
collected from Figure 1.
For the RuPMAS films, the FLIM images of both the HMWT and LMWT PMAS fractions were as
expected, with the LMWT PMAS composite showing greater luminescence as shown below. Depth
profiling of these films was also obtained with information on the different emission profiles of the
ruthenium at different distances from the electron surface. This may offer insights for determining the
optimal film thickness required for subsequent sensor applications or solar cell devices. In addition to this
Ln(Intensity)
47