Oriented Nanostructures from Single Molecules of a Semiconducting Polymer:  Polarization Evidence for Highly Aligned Intramolecular Geometries

Mehta, Adosh; Kumar, Pradeep; Dadmun, Mark; Zheng, Jie; Dickson, Robert M.; Thundat, Thomas; Sumpter, Bobby G.; Barnes, Michael D.

doi:10.1021/nl0340733

Cited by 47 publications

(59 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This incredible improvement was also reported in our previous articles that describe the details of the experimental measurements and observations [2,34,35]. Similar results have also been found for MEH-PPV but typical quantum yields of z-oriented single molecule nanoparticles of MEH-PPV are <0.5.…”

Section: Experimental Observations and Resultssupporting

confidence: 87%

“…We have used ink-jet printing methods to isolate single conducting polymer chains in microdroplets in various organic solvents (tetrahydrofuran (THF), toluene, etc) typically less than 5 µm initial diameter [34,35]. The droplets evaporate en route to the coverglass substrate thus allowing self-organization of the polymer chain in the absence of host polymer or substrate interactions (see figure 1 for a schematic).…”

Section: Experimental Observations and Resultsmentioning

confidence: 99%

“…Together, these measurements provide a picture that suggests stiff-chain organization within individual macromolecules adsorbed on the glass surface. Details of the fluorescence microscopy are given in [34,35]. Fluorescence images were acquired on a Nikon TE 300 inverted microscope with a 1.4 N.A.…”

Section: Experimental Observations and Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A combined theoretical and experimental study of the polymer inter-chain structure in poly(phenylene vinylene) derivatives

et al. 2008

View full text Add to dashboard Cite

Section: Experimental Observations and Resultssupporting

confidence: 87%

Section: Experimental Observations and Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A combined theoretical and experimental study of the polymer inter-chain structure in poly(phenylene vinylene) derivatives

et al. 2008

View full text Add to dashboard Cite

“…Fitting of the pattern provides the polar angles of the dipole orientation. Th is method has been used successfully to confi rm the perpendicular orientation with respect to the substrate of ordered MEH-PPV nanoparticles [18]. Alternatively, in samples with limited degrees of freedom, such as rod-like MEH-PPV chains in a nematic liquid crystal, the orientation can be monitored simply by measuring the degree of fl uorescence anisotropy [19].…”

Section: Optical Measurement Of Conformation and Orientation Of A Sinmentioning

confidence: 99%

Conformation and physics of polymer chains: a single-molecule perspective

Vácha

Habuchi

2010

NPG Asia Mater

View full text Add to dashboard Cite

N anotechnology has been one of the driving forces of science and technology over the past 20 years. Scaling down the size of an object to nanometer dimensions can result in dramatic changes to its physical properties. With recent progress in the nanoscience and nanotechnology of polymeric materials, new methods are now required for the characterization of polymer structures and properties. Despite the great success of electron microscopy and scanning probe microscope techniques, there remains a need for a non-invasive method that could provide information not only on the structure but also on the physical phenomena occurring on the nanoscale level. One method that has recently emerged as an excellent tool for nanoscale characterization is single-molecule optical detection and spectroscopy. Single-molecule spectroscopy relies on the detection and measurement of the fl uorescence signal and spectra from single isolated molecules or polymer chains (Figure 1). Th ese can either be immobilized in a solid matrix or be diff using in a solution or melt. In all cases, the concentration of the emitting molecules must be suffi ciently low to ensure that the spatial separation between individual molecules is larger than the optical resolution of the setup, typically on the order of micrometers. As the fl uorescence signal from a molecule is strongly infl uenced by the nanoscale environment, measuring many molecules one by one provides the distribution of physical properties of the respective nano-environments. Moreover, monitoring a molecule over a period of time reveals dynamic changes in its environment. Th ese static and dynamic heterogeneities of nanoscale properties are averaged and hidden in the usual ensemble experiments. Th e strength of fl uorescence detection is in its sensitivity and low background level -emissions of just a few hundred photons per second can be readily detected. Th e technique also off ers remarkable dynamic range, from sub-nanosecond timescales to seconds and longer, and is non-invasive, making it possible to detect emissions from molecules buried deep in a sample.Single-molecule spectroscopy has evolved since the beginning of the 1990s from low-temperature, high-resolution optical spectroscopic

show abstract

“…In this case, a slight helicity can be seen owing to the steric interactions of the alkyl side groups. 35 The helix conformation decreases the degree of molecular planarity of the polymer p-conjugated backbone, leading to a blue shifted spectrum.…”

mentioning

confidence: 99%

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

Yang

Lin

et al. 2015

Applied Physics Letters

View full text Add to dashboard Cite

We investigated the transitions of conformations and their effects on emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) single molecules in PMMA matrix during thermal annealing process. Total internal reflection fluorescence microscopy measurements reveal the transformation from collapsed conformations to extended, highly ordered rod-like structures of MEH-PPV single molecules during thermal annealing. The blue shifts in the ensemble single molecule PL spectra support our hypnosis. The transition occurs as the annealing temperature exceeds 100 °C, implying that an annealing temperature near the glass transition temperature Tg of matrix is ideal for the control and optimization of blend polymer films.

show abstract

Oriented Nanostructures from Single Molecules of a Semiconducting Polymer: Polarization Evidence for Highly Aligned Intramolecular Geometries

Cited by 47 publications

References 20 publications

A combined theoretical and experimental study of the polymer inter-chain structure in poly(phenylene vinylene) derivatives

A combined theoretical and experimental study of the polymer inter-chain structure in poly(phenylene vinylene) derivatives

Conformation and physics of polymer chains: a single-molecule perspective

Connection between the conformation and emission properties of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-1,4-phenylene vinylene] single molecules during thermal annealing

Contact Info

Product

Resources

About