Single particle spectroscopy on composite MEH-PPV/PCBM nanoparticles

Tenery, Daeri; Worden, James G.; Hu, Zhongjian; Gesquiere, Andre J.

doi:10.1016/j.jlumin.2008.11.009

Cited by 27 publications

(35 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[51] Briefly, nanoparticles are prepared via the reprecipitation method yielding a nanoparticle suspension in water. The size of the nanoparticles as determined by dynamic light scattering and atomic force microscopy (data not shown), and transmission electron microscopy (TEM) is approximately 30 nm at low PCBM doping levels, while at higher PCBM doping levels the nanoparticle size increases to nearly 60 nm due to the increasing amount of PCBM present in the nanoparticles.…”

Section: Methodsmentioning

confidence: 99%

“…Single particle fluorescence images and spectra were acquired using a home built sample-scanning confocal microscope under 488 nm laser excitation. [51] Undoped nanoparticle samples were typically excited with 0.72 W cm À2 laser power, while doped nanoparticles were investigated with a 10-fold larger laser power (7.2 W cm…”

Section: Methodsmentioning

confidence: 99%

“…We recently reported the fabrication of composite nanoparticles of the conjugated polymer poly[2-methoxy-5-(2-ethylhexyl-oxy)-p-phenylenevinylene] (MEH-PPV) and the fullerene 1-(3-methoxycarbonylpropyl)-1-phenyl-[6.6]C 61 (PCBM), [51] a material system that is commonly used as an active layer in bulk heterojunction organic photovoltaic devices (BH-OPV). [52][53][54][55][56][57][58] Molecular structures and resulting nanoparticle suspensions are shown in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of PCBM Concentration on Photoluminescence Properties of Composite MEH‐PPV/PCBM Nanoparticles Investigated by a Franck–Condon Analysis of Single‐Particle Emission Spectra

Tenery

Gesquiere

2009

ChemPhysChem

Self Cite

View full text Add to dashboard Cite

The emission of composite conjugated polymer (MEH-PPV)/fullerene (PCBM) nanoparticles is investigated by single particle spectroscopy (SPS), and changes in vibronic structure with nanoparticle composition are evaluated by means of a detailed Franck-Condon analysis. Consistent with previous reports we find that the emission spectra can be modeled as the superposition of two types of emitters, one with aggregate character and one with molecular character. Major findings from the fitting of the SPS data to a Franck-Condon model are that 1) the occurrence of each of the two types of emitters changes with nanoparticle composition to the point that no aggregate emitters are detected (at 50 wt% PCBM), 2) at the highest PCBM doping levels (75 wt% PCBM) aggregate emitters reappear due to nanoscale phase separation in the composite nanoparticles, 3) the molecular emitters show small Huang-Rhys factors that increase with PCBM doping, indicative of extensive delocalization and exciton migration that is reduced by the disorder introduced in the polymer material by PCBM doping and 4) the aggregate emitters show large Huang-Rhys factors, indicative of the localized nature of these energy trap sites, with a broad distribution of values of these Huang-Rhys factors. The latter observation suggests a broad heterogeneous distribution of aggregate morphologies in blended conducting polymer materials, which can be attributed to variations in polymer chain folding and stacking at the aggregate sites. The reported results obtained by the SPS approach show how blending conjugated polymers with fullerenes at various doping levels induces changes in interchain interactions and aggregate site density even at length scales below a few tens of nanometers that affect conjugated polymer material properties, an observation that has gone unnoticed in bulk studies of blended conjugated polymer films.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of PCBM Concentration on Photoluminescence Properties of Composite MEH‐PPV/PCBM Nanoparticles Investigated by a Franck–Condon Analysis of Single‐Particle Emission Spectra

Tenery

Gesquiere

2009

ChemPhysChem

Self Cite

View full text Add to dashboard Cite

show abstract

“…THF (tetrahydrofuran) Drisolv was purchased from EMD Millipore. The CPNPs were fabricated following previously published protocol [69][70][71]. In short, 1 mg MEH-PPV was dissolved in THF and was diluted to a 10 −6 M concentration.…”

Section: Fabrication Of Npsmentioning

confidence: 99%

“…The CPNPs were prepared by the reprecipitation method [69][70][71]. The resulting CPNPs are small quasi-spherical clusters of about 20-50 polymer chains [72].…”

Section: Cpnp Fabrication and Characterizationmentioning

confidence: 99%

Development and characterization of conducting polymer nanoparticles for photodynamic therapy in vitro

Doshi

Copik

Gesquiere

2015

Photodiagnosis and Photodynamic Therapy

Self Cite

View full text Add to dashboard Cite

Conducting polymer nanoparticles (CPNPs), composed of the conducting polymer poly[2-methoxy-5-(2-ethylhexyl-oxy)-p-phenylenevinylene] (MEH-PPV) were studied for applications in biophotonics and therapeutics. The extent of cellular uptake, cytotoxicity, and effectiveness of these nanoparticles in photodynamic therapy (PDT) was investigated for four cell lines, namely TE-71, MDA-MB-231, A549 and OVCAR3. Confocal fluorescence imaging and flow cytometry show that CPNPs are taken up only in limited quantities by TE-71, while they are taken up extensively by the cancer cell lines. The uptake among the cancer cell lines was observed to vary with cell line, with CPNPs uptake increasing from MDA-MB-231 to A549 to OVCAR3. Fluorescence imaging experiments show that the CPNPs have high brightness and appear stable in the intracellular environment. No cytotoxicity of non-photoactivated CPNPs (in dark) was observed from MTT assay. After completion of PDT, the quantitative data on cell viability suggest that cell death scales across the cell lines with CPNP uptake, is light dose dependent, and is complete for OVCAR3. In addition, for OVCAR3 apoptotic cell death is observed after PDT. The reported work illustrates the potential of the intrinsically fluorescent and photoactivateable CPNPs for application in biophotonics and therapeutics.

show abstract

Ultrastable, Highly Luminescent Organic–Inorganic Perovskite–Polymer Composite Films

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

Single particle spectroscopy on composite MEH-PPV/PCBM nanoparticles

Cited by 27 publications

References 48 publications

Effect of PCBM Concentration on Photoluminescence Properties of Composite MEH‐PPV/PCBM Nanoparticles Investigated by a Franck–Condon Analysis of Single‐Particle Emission Spectra

Effect of PCBM Concentration on Photoluminescence Properties of Composite MEH‐PPV/PCBM Nanoparticles Investigated by a Franck–Condon Analysis of Single‐Particle Emission Spectra

Development and characterization of conducting polymer nanoparticles for photodynamic therapy in vitro

Ultrastable, Highly Luminescent Organic–Inorganic Perovskite–Polymer Composite Films

Contact Info

Product

Resources

About