scholarly journals Fluorescence Modulation of Conjugated Polymer Nanoparticles Embedded in Poly(N-Isopropylacrylamide) Hydrogel

Polymers ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 4315
Author(s):  
Ho Namgung ◽  
Seonyoung Jo ◽  
Taek Seung Lee
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Excitation Wavelength ◽  
Visible Absorption ◽  
Polymer Hydrogel ◽  
Polymer Dots ◽  
Phenylene Group ◽  
Conjugated Polymer Nanoparticles ◽  
Fluorescence Modulation ◽  
Reprecipitation Method

A series of conjugated polymers (CPs) emitting red, green, and blue (RGB) fluorescence were synthesized via the Suzuki coupling polymerization. Polymer dots (Pdots) were fabricated by the reprecipitation method from corresponding CPs, in which the Pdot surface was functionalized to have an allyl moiety. The CP backbones were based on the phenylene group, causing the Pdots to show identical ultraviolet-visible absorption at 350 nm, indicating that the same excitation wavelength could be used. The Pdots were covalently embedded in poly(N-isopropylacrylamide) (PNIPAM) hydrogel for further use as a thermoresponsive moiety in the polymer hydrogel. The polymer hydrogel with RGB emission colors could provide thermally reversible fluorescence changes. The size of the hydrogel varied with temperature change because of the PNIPAM’s shrinking and swelling. The swollen and contracted conformations of the Pdot-embedded PNIPAM enabled on-and-off fluorescence, respectively. Fluorescence modulation with 20 to 80% of the hydrogel was possible via thermoreversibility. The fluorescent hydrogel could be a new fluorescence-tuning hybrid material that changes with temperature.

Carbon Nanotube-Induced Planarization of Conjugated Polymers in Solution

2004 ◽  
Vol 858 ◽  
Author(s):  
Jian Chen ◽  
Rajagopal Ramasubramaniam ◽  
Haiying Liu
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Nanotube ◽  
Conjugated Polymers ◽  
Spectroscopic Study ◽  
Surface Quality ◽  
Hybrid Materials ◽  
Conjugated Polymer ◽  
Visible Absorption ◽  
The Impact ◽  
Conformational Interaction

ABSTRACTThe understanding of the conformational interaction between conjugated polymers and carbon nanotubes in solution is essential to develop the applications of carbon nanotubes, particularly conjugated polymer-carbon nanotube hybrid materials. The visible absorption spectroscopic study shows that curved carbon nanotube surfaces can induce the planarization of individual conjugated polymers such as poly(p-phenyleneethynylene)s and poly(3-alkylthiophene)s in solution. The impact of nanotube surface quality on the interaction between carbon nanotubes and conjugated polymers is investigated.

Synthesis of fluorescent conjugated polymer nanoparticles and their immobilization on a substrate for white light emission

2018 ◽  
Vol 9 (48) ◽  
pp. 5671-5679 ◽  
Author(s):  
Choongho Kim ◽  
Young Jin Gwon ◽  
Jongho Kim ◽  
Taek Seung Lee
Keyword(s):  
Conjugated Polymers ◽  
White Light ◽  
Conjugated Polymer ◽  
Light Emission ◽  
Coupling Reaction ◽  
Suzuki Coupling ◽  
Polymer Nanoparticles ◽  
Red Emission ◽  
Suzuki Coupling Reaction ◽  
Conjugated Polymer Nanoparticles

Fluorescent conjugated polymers (CPs) for blue, green, and red emission were polymerized via the Suzuki coupling reaction.

Molecular engineering of diketopyrrolopyrrole-conjugated polymer nanoparticles by chalcogenide variation for photoacoustic imaging guided photothermal therapy

2021 ◽  
Vol 9 (14) ◽  
pp. 3153-3160
Author(s):  
Xin Jin ◽  
Xiaoyi Xing ◽  
Qingyuan Deng ◽  
Weixia Qing ◽  
Zhonghua Liu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Efficient Method ◽  
Conjugated Polymer ◽  
Photothermal Therapy ◽  
Photoacoustic Imaging ◽  
Molecular Engineering ◽  
Polymer Nanoparticles ◽  
Conjugated Polymer Nanoparticles ◽  
Molecular Skeleton

This work presents an efficient method of accessing DPP-SO that not only possess an excellent anti-tumour property but also regulates the photothermal performance of DPP-conjugated polymers by changing the heteroatom in the molecular skeleton.

scholarly journals Conjugated polymers as nanoparticle probes for fluorescence and photoacoustic imaging

2020 ◽  
Vol 8 (4) ◽  
pp. 592-606 ◽  
Author(s):  
Thais Fedatto Abelha ◽  
Cécile A. Dreiss ◽  
Mark A. Green ◽  
Lea Ann Dailey
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Photoacoustic Imaging ◽  
Polymer Nanoparticles ◽  
Nanoparticle Probes ◽  
Conjugated Polymer Nanoparticles

In this review, the role of conjugated polymer nanoparticles (CPNs) in emerging bioimaging techniques is described.

SYNTHESIS AND ELECTRO-OPTICAL PROPERTIES OF BLUE EMITTING POLY(BP-alt-BCV) CONJUGATED POLYMERS

2005 ◽  
Vol 14 (04) ◽  
pp. 535-543
Author(s):  
JEONG JU BAEK ◽  
YOUNG CHUL JEONG ◽  
LEE SOON PARK ◽  
JUNG KYUNG LEE ◽  
YOON SOO HAN ◽  
...  
Keyword(s):  
Optical Properties ◽  
Conjugated Polymers ◽  
Double Layer ◽  
Phosphonic Acid ◽  
Conjugated Polymer ◽  
Absorption Maximum ◽  
Blue Emission ◽  
Diethyl Ester ◽  
Visible Absorption ◽  
Uv Visible

A new blue electroluminescent conjugated polymer, poly(BP-alt-BCV), was prepared by Hornor–Emmons polycondensation of [5-carbazol-9-yl-3-(diethoxy-phosphorylmethyl)-2-(2-ethyl-hexyloxy)-benzyl]-phosphonic acid diethyl ester (PHBP) and 4,4′-biphenyldicarboxaldehyde (BPCA) in the presence of tert-BuOK in THF. UV-visible absorption maximum (λmax,UV, π-π* transition) of poly(BP-alt-BCV) was measured at 340 nm. PL maximum (λmax,PL) values of poly(BP-alt-BCV) were obtained at 406 and 430 nm, when excited at its own λmax,UV. It was found that double layer [ITO/poly(BP-alt-BCV)/Alq3 (50 Å)/Al] PLED exhibited maximum EL peak at 440 nm and blue emission (x = 0.1794, y = 0.1878), similar to the NTSC standard blue (x = 0.14, y = 0.08).

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