RESEARCH POSTER PRESENTATION DESIGN © 2011 www.PosterPresentations.com • We study solution unimer plus aggregates (P3HT, P3OT, and P3BT) that are controlled by inducing in solutions • Good Solvent solubilizes polythiophene • Bad Solvent induces formation of aggregates • Control of aggregate formation by volume ratio • Characterize unimer and aggregates of good/bad solvents by optical spectroscopy of UV-Absorption spectrum and photoluminescent spectrum ABSTRACT • Dissolve P3HT, P3OT, and P3BT in Chloroform (Good Solvent) • Add control amount of bad solvents (acetone, acetonitrile, dimethylformamide, ethanol, hexane, methanol, and tetrahydrofuran) • Measure UV-Vis absorption spectrum and photoluminescent spectrum – Band Gap – HOMO-LUMO (High Occupied Molecular Orbital and Low Unoccupied Molecular Orbital) – π – π stacking – Energy Diagrams: EXPERIMENTAL PROCEDURES P3OT IN CHLOROFORM/ACETONE P3HT IN CHLOROFORM/ACETONE P3BT IN CHLOROFORM/ACETONE CONCLUSIONS • Shift of Absorption peak position from 455 nm for P3BT to 455 nm for P3HT to 450 nm for P3OT • Maximum of Photoluminescence peak from 570 nm for P3BT down to 575 nm for P3HT to 570 nm for P3OT • P3HT requires least amount of acetone for aggregate formations • P3OT requires most amount of acetone for aggregate formations REFERENCES 1 Y. D. Park, H. S. Lee, Y. J. Choi, D. Kwak, J. H. Cho, S. Lee, K. Cho, Adv. Funct. Mater. 2009, 19, 1200-1206. 2 H. Cheng, C. C. Han, Y. Huang, ACS Publications. 2011. 3 T. Erb, S. Raleva, U. Zhokhavets, G. Gobsch, B. Stuhn, M. Spode, O. Ambacher, Science Direct. 2003. 4 H. Goto, Y. Okamoto, E. Yashima, ACS Publications. 2002. The Effect of Substituent Side Chain Length and Solvent Induced Transformations of Unimer to Aggregates in Polythiophene Solutions Experiment 1 Department of Chemistry, University of TennesseeKnoxville Knoxville, TN 37996 2 Center for Nanophase Materials Sciences, Oak Ridge NaMonal Laboratory Oak Ridge, TN 37830 3 Materials Sciences and Engineering, Tennessee Technical UniversityCookeville Cookeville, TN 38505 Davis Hu 1 , Ilia Ivanov 2 , Kunlun Hong 2 , Monojoy Goswami 2 , Nathan Livesey 3 400 500 600 0.076 0.114 0.152 0.190 Absorbance (au) Wavelength (nm) 450 nm 0 10 20 0.00 0.05 0.10 0.15 0.20 455 nm 520 nm 560 nm 605 nm Absorbance Acetone in Chloroform, % wt. 500 600 700 800 0.0 5.0 Photoluminescence Intensity (counts)x10 6 Wavelength (nm) 575 nm 0 10 20 0.0 5.0 575 nm PL Intensity @ 575 nm Acetone in Chloroform, % wt 400 500 600 0.0 0.1 0.2 0.3 0.4 Absorbance (au) Wavelength (nm) 450 nm 500 600 700 800 0.0 5.0 10.0 15.0 Photoluminescence Intensity (counts)x10 6 Wavelength (nm) 573 nm 0 10 20 30 5.0 10.0 15.0 575 nm PL Intensity @ 575 nm Acetone in Chloroform, % wt 0 10 20 30 0.1 0.2 0.3 0.4 448 nm 550 nm Absorbance Acetone in Chloroform, % wt. 400 500 600 0.000 0.063 0.126 0.189 Absorbance (au) Wavelength (nm) 450 nm 500 600 700 800 0.0 5.0 10.0 Photoluminescence Intensity (counts)x10 6 Wavelength (nm) 570 nm 0 10 20 0.1 0.2 450 nm 565 nm 610 nm Absorbance Acetone in Chloroform, % wt. 0 10 20 0.0 5.0 10.0 570 nm PL Intensity @ 570 nm Acetone in Chloroform, % wt
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• We study solution unimer plus aggregates (P3HT, P3OT, and P3BT) that are controlled by inducing in solutions
• Good Solvent solubilizes polythiophene • Bad Solvent induces formation of
aggregates • Control of aggregate formation by
volume ratio • Characterize unimer and aggregates of
good/bad solvents by optical spectroscopy of UV-Absorption spectrum and photoluminescent spectrum
ABSTRACT
• Dissolve P3HT, P3OT, and P3BT in Chloroform (Good Solvent) • Add control amount of bad solvents (acetone,
acetonitrile, dimethylformamide, ethanol, hexane, methanol, and tetrahydrofuran) • Measure UV-Vis absorption spectrum and
photoluminescent spectrum – Band Gap – HOMO-LUMO (High Occupied Molecular Orbital
and Low Unoccupied Molecular Orbital) – π – π stacking
– Energy Diagrams:
EXPERIMENTAL PROCEDURES P3OT IN CHLOROFORM/ACETONE
P3HT IN CHLOROFORM/ACETONE P3BT IN CHLOROFORM/ACETONE
CONCLUSIONS
• Shift of Absorption peak position from 455 nm for P3BT to 455 nm for P3HT to 450 nm for P3OT • Maximum of Photoluminescence peak from 570 nm for P3BT down to 575 nm for P3HT to 570 nm for P3OT • P3HT requires least amount of acetone for aggregate formations • P3OT requires most amount of acetone for aggregate formations
REFERENCES 1 Y. D. Park, H. S. Lee, Y. J. Choi, D. Kwak, J. H. Cho, S.
Lee, K. Cho, Adv. Funct. Mater. 2009, 19, 1200-1206. 2 H. Cheng, C. C. Han, Y. Huang, ACS Publications. 2011. 3 T. Erb, S. Raleva, U. Zhokhavets, G. Gobsch, B. Stuhn, M.
Spode, O. Ambacher, Science Direct. 2003. 4 H. Goto, Y. Okamoto, E. Yashima, ACS Publications. 2002.
The Effect of Substituent Side Chain Length and Solvent Induced Transformations of Unimer to Aggregates in Polythiophene Solutions Experiment
1 Department of Chemistry, University of Tennessee-‐Knoxville Knoxville, TN 37996 2Center for Nanophase Materials Sciences, Oak Ridge NaMonal Laboratory Oak Ridge, TN 37830
3Materials Sciences and Engineering, Tennessee Technical University-‐Cookeville Cookeville, TN 38505
Davis Hu1, Ilia Ivanov2, Kunlun Hong2, Monojoy Goswami2, Nathan Livesey3
400 500 600
0.076
0.114
0.152
0.190
Abso
rban
ce (a
u)
Wavelength (nm)
450 nm
0 10 20
0.00
0.05
0.10
0.15
0.20
455 nm 520 nm 560 nm 605 nm
Abs
orba
nce
Acetone in Chloroform, % wt.
500 600 700 8000.0
5.0
Phot
olum
ines
cenc
e In
tens
ity (c
ount
s)x1
06
Wavelength (nm)
575 nm
0 10 200.0
5.0
575 nm
PL In
tens
ity @
575
nm
Acetone in Chloroform, % wt
400 500 6000.0
0.1
0.2
0.3
0.4
Abso
rban
ce (a
u)
Wavelength (nm)
450 nm
500 600 700 800
0.0
5.0
10.0
15.0
Phot
olum
ines
cenc
e In
tens
ity (c
ount
s)x1
06
Wavelength (nm)
573 nm
0 10 20 30
5.0
10.0
15.0
575 nm
PL In
tens
ity @
575
nm
Acetone in Chloroform, % wt
0 10 20 30
0.1
0.2
0.3
0.4
448 nm 550 nm
Abso
rban
ce
Acetone in Chloroform, % wt.
400 500 6000.000
0.063
0.126
0.189
Abso
rban
ce (a
u)
Wavelength (nm)
450 nm
500 600 700 800
0.0
5.0
10.0
Phot
olum
ines
cenc
e In
tens
ity (c
ount
s)x1
06
Wavelength (nm)
570 nm
0 10 20
0.1
0.2
450 nm 565 nm 610 nm
Abso
rban
ce
Acetone in Chloroform, % wt.
0 10 200.0
5.0
10.0
570 nm
PL In
tens
ity @
570
nm
Acetone in Chloroform, % wt
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