Abstract
A diacetylene derivative, 10,12-pentacosadiynoic acid (PDA), was conjugated to a small peptide chain Cysteine-Cysteine-Glycine (CCG) through the solid-phase peptide synthesis. The (CdSe)ZnS core-shell quantum dots (QDs) capped with trioctylphosphine ligands were modified through a surface ligand reaction to prepare the PDA-CCG QDs conjugate. Both systems, PDA-CCG and PDA-CCG QDs, were investigated as Langmuir monolayer at the air-water interface through the surface pressure-area (π-A) isotherms, compression-decompression cycles, stability measurements, and in situ UV-vis and fluorescence spectroscopy. Two different π-A isotherms were observed for the systems investigated showing the importance of the peptide moiety in PDA-CCG to form a Langmuir monolayer up to a surface pressure of 50 mN m-1 compared with 15 mN m-1 for the PDA component alone. The compression-decompression cycles and stability measurements for both systems suggest the formation of a stable Langmuir monolayer over 1 h time period. Although the in situ UV-vis spectroscopy of PDAA-CCG and PDA-CCG QDs does not show an absorption spectrum, we observed by in situ fluorescence spectroscopy the photoluminescence (PL) of the PDA-CCG QDs at 560 nm, with an intensity of the PL increasing linearly with the increase of the surface pressure. Irradiating the PDA-CCG QDs Langmuir monolayer at 254 nm, we observe the photopolymerization with two distinct bands at 575 (blue band) and 630 nm (red band) of the polymer.
| Original language | English |
|---|---|
| Pages (from-to) | 163-168 |
| Number of pages | 6 |
| Journal | Colloids and Surfaces B: Biointerfaces |
| Volume | 70 |
| Issue number | 2 |
| DOIs | |
| State | Published - May 1 2009 |
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Keywords
- 10,12-Pentacosadiynoic acid
- Langmuir monolayer
- Photopolymerization
- Quantum dots
ASJC Scopus subject areas
- Biotechnology
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
- Surfaces and Interfaces
Cite this
Surface chemistry and photophysical properties of a diacetylene-peptide derivative capped quantum dots Langmuir monolayer. / Xu, J.; Wang, C.; Leblanc, Roger.
In: Colloids and Surfaces B: Biointerfaces, Vol. 70, No. 2, 01.05.2009, p. 163-168.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Surface chemistry and photophysical properties of a diacetylene-peptide derivative capped quantum dots Langmuir monolayer
AU - Xu, J.
AU - Wang, C.
AU - Leblanc, Roger
PY - 2009/5/1
Y1 - 2009/5/1
N2 - A diacetylene derivative, 10,12-pentacosadiynoic acid (PDA), was conjugated to a small peptide chain Cysteine-Cysteine-Glycine (CCG) through the solid-phase peptide synthesis. The (CdSe)ZnS core-shell quantum dots (QDs) capped with trioctylphosphine ligands were modified through a surface ligand reaction to prepare the PDA-CCG QDs conjugate. Both systems, PDA-CCG and PDA-CCG QDs, were investigated as Langmuir monolayer at the air-water interface through the surface pressure-area (π-A) isotherms, compression-decompression cycles, stability measurements, and in situ UV-vis and fluorescence spectroscopy. Two different π-A isotherms were observed for the systems investigated showing the importance of the peptide moiety in PDA-CCG to form a Langmuir monolayer up to a surface pressure of 50 mN m-1 compared with 15 mN m-1 for the PDA component alone. The compression-decompression cycles and stability measurements for both systems suggest the formation of a stable Langmuir monolayer over 1 h time period. Although the in situ UV-vis spectroscopy of PDAA-CCG and PDA-CCG QDs does not show an absorption spectrum, we observed by in situ fluorescence spectroscopy the photoluminescence (PL) of the PDA-CCG QDs at 560 nm, with an intensity of the PL increasing linearly with the increase of the surface pressure. Irradiating the PDA-CCG QDs Langmuir monolayer at 254 nm, we observe the photopolymerization with two distinct bands at 575 (blue band) and 630 nm (red band) of the polymer.
AB - A diacetylene derivative, 10,12-pentacosadiynoic acid (PDA), was conjugated to a small peptide chain Cysteine-Cysteine-Glycine (CCG) through the solid-phase peptide synthesis. The (CdSe)ZnS core-shell quantum dots (QDs) capped with trioctylphosphine ligands were modified through a surface ligand reaction to prepare the PDA-CCG QDs conjugate. Both systems, PDA-CCG and PDA-CCG QDs, were investigated as Langmuir monolayer at the air-water interface through the surface pressure-area (π-A) isotherms, compression-decompression cycles, stability measurements, and in situ UV-vis and fluorescence spectroscopy. Two different π-A isotherms were observed for the systems investigated showing the importance of the peptide moiety in PDA-CCG to form a Langmuir monolayer up to a surface pressure of 50 mN m-1 compared with 15 mN m-1 for the PDA component alone. The compression-decompression cycles and stability measurements for both systems suggest the formation of a stable Langmuir monolayer over 1 h time period. Although the in situ UV-vis spectroscopy of PDAA-CCG and PDA-CCG QDs does not show an absorption spectrum, we observed by in situ fluorescence spectroscopy the photoluminescence (PL) of the PDA-CCG QDs at 560 nm, with an intensity of the PL increasing linearly with the increase of the surface pressure. Irradiating the PDA-CCG QDs Langmuir monolayer at 254 nm, we observe the photopolymerization with two distinct bands at 575 (blue band) and 630 nm (red band) of the polymer.
KW - 10,12-Pentacosadiynoic acid
KW - Langmuir monolayer
KW - Photopolymerization
KW - Quantum dots
UR - http://www.scopus.com/inward/record.url?scp=62349132347&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=62349132347&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfb.2008.11.022
DO - 10.1016/j.colsurfb.2008.11.022
M3 - Article
C2 - 19185472
AN - SCOPUS:62349132347
VL - 70
SP - 163
EP - 168
JO - Colloids and Surfaces B: Biointerfaces
JF - Colloids and Surfaces B: Biointerfaces
SN - 0927-7765
IS - 2
ER -