Professor Hugh D. Burrows

worshiprelaxedΗλεκτρονική - Συσκευές

2 Νοε 2013 (πριν από 3 χρόνια και 11 μήνες)

95 εμφανίσεις








VABILO NA PREDAVANJE

V OKVIRU DOKTORSKEGA ŠTUDIJA

KEMIJSKE ZNANOSTI


Professor
Hugh D. Burrows



Department of Chemistry, University of Coimbra,

Portugal


z naslovom:


Applications of Self
-
Assembled
Conjugated Polyelectrolytes from Artificial
Photosynthesis to Explosives Detection


v
sredo
,
15
.
ma
j
a

201
3

ob 1
5
:
0
0 uri

v novi predavalnici, na Fakulteti

za kemijo in kemijsko tehnologijo, Aškerčeva 5




Vljudno vabljeni !










Abstract


Luminescent conjugated polymers are
technologically important materials with
real and potential applications including field effect transistors, light emitting diodes,
chemical and biological sensors, charge injection and transport layers.

The major
advantage of these polymers for luminescence sensing applications
follows from the
ideas of Swager (1) that the
highly delocalised conjugated backbones lead to
the
amplification of sensor signals associated with the “molecular wire” properties of

these materials. This
leads both to highly efficient fluorescence quenching and the
possibility of Förster Resonance Energy Transfer (FRET)

to appropriate acceptors.
Conjugated polymers

can be made water soluble by introducton of ionic groups to
produce
conjugated polyelectrolytes (CPEs). These can be nanostructured to build
up organised nanostructures through self
-
assembly with surfactants, metal ions or
water soluble polymers (2). A
n overview will be provided of the effects of self
-
assembly in CPEs on their spectral and photophysical properties, concentrating in
particular on systems involving fluorene, phenylene and thiophene repeat units. It will
be shown that electronic energy tra
nsfer from the conjugated polymer to metal
complexes (3) or porphyrins (4) provides a way of mimicking the light harvesting
process in photosynthesis, which can be used for initiating chemical reactions. In
addition, the application of self
-
assembled CPEs
in fluorescence sensing of anions,
including nucleic acids (5,6), will be discussed. Finally, we will show how
fluorescence in these systems can provide a highly sensitive route to detect
nitroaromatic compounds present in explosives.


1. S.W. Thomas, G.D
. Joly. T.M. Swager,
Chem. Rev.
2007,
107
,

1339.

2. H. D. Burrows, M. Knaapila, S. M. Fonseca, T. Costa, in “
Conjugated
Polyelectrolytes. Fundamentals and

Applications in Emerging Technologies
”,ed.
B. Liu, G. C. Bazan, Wiley
-
VCH, Weinheim, 2013, Chapter 4,

pp.127
-
167.

3. H.D. Burrows, S.M. Fonseca, F.B. Dias, J. Seixas de Melo, A.P. Monkman,
U. Scherf, S. Pradhan,
Adv.Mater.
2009,
21
, 1155.

4. A.T. Marques, S.M.A. Pinto, C.J.P. Monteiro, J. S. Seixas de Melo, H.D.
Burrows, U. Scherf, M.J.F. Calvete, M.M. Pereira,
J. Polym. Sci., Polym. Chem
.,
2012,
50
, 1408
-
1417.

5. M.J. Tapia, M. Montserín, A.J.M. Valente, H.D. Burrows, R. Mallavia,
Adv.
Co
ll. Interface Sci.

2010,
158,
94.

6. S.M. Fonseca, R.P. Galvão, H.D. Burrows, A. Gutacker, U. Scherf, G.C.
Bazan,

Macromol.Rapid.Comm.
DOI: 10.1002/marc.201200734.