Study of the effect of excited state concentration on photodegradation of the p3ht polymer

Peters, V. N.; Peters, D. A.; Noginov, M. A.

doi:10.1038/srep33238

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…Interestingly, the order of the latter ratios correlated with the order of dielectric permittivities in the metals studied, inset of Figure . (In a separate study, it has been shown that the rate of photodegradation of P3HT does not correlate with the substrate-specific excited state concentration and spontaneous emission of thiophene rings. )…”

Section: Experimental Demonstrationsmentioning

confidence: 94%

“…Interestingly, the order of the latter ratios correlated with the order of dielectric permittivities in the metals studied, 24 inset of Figure 18. (In a separate study, 115 it has been shown that the rate of photodegradation of P3HT does not correlate with the substrate-specific excited state concentration and spontaneous emission of thiophene rings.) Thus, it has been unambiguously proven 24 that the rates of chemical reactions can be controlled not only by local dielectric permittivities, but also by nonlocal dielectric environments.…”

Section: Acs Photonicsmentioning

confidence: 95%

See 1 more Smart Citation

Control of Physical and Chemical Processes with Nonlocal Metal–Dielectric Environments

et al. 2019

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In this Perspective, we make the case that (meta) material platforms that were originally designed to control the propagation of light can affect scores of physical and chemical phenomena, which are often thought to lie outside of the traditional electrodynamics domain. We show that nonlocal metal-dielectric environments, which can be as simple as metal−dielectric interfaces, can control spontaneous and stimulated emission, Forster energy transfer, wetting contact angle, and rates of chemical reactions. The affected phenomena can occur in both strong and weak coupling regimes and the large coupling strength seems to enhance the effects of nonlocal environments. This intriguing field of study has experienced a rapid growth over the past decade and many exciting discoveries and applications are expected in the years to come.

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Section: Experimental Demonstrationsmentioning

confidence: 94%

Section: Acs Photonicsmentioning

confidence: 95%

Control of Physical and Chemical Processes with Nonlocal Metal–Dielectric Environments

et al. 2019

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“…The light-induced applications of OSCs described above exploit the relaxation processes following photoexcitation, such as photoluminescence, heat generation due to the internal conversion of the excited state, or electron transfer to a nearby molecule, leading to the generation of radical chemical species. The relaxation processes are coupled and in dynamic competition, which can lead to non-linear responses to light exposure ( Peters et al, 2016 ). On the biological side, effects of undesired relaxation pathways must be carefully considered to pair OSCs effectively and reliably to their intended applications.…”

Section: Introductionmentioning

confidence: 99%

Photosensitized and Photothermal Stimulation of Cellular Membranes by Organic Thin Films and Nanoparticles

Feyen

Matarèse

Urbano

et al. 2022

Front. Bioeng. Biotechnol.

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Conjugated polymers are increasingly exploited for biomedical applications. In this work, we explored the optical characteristics of conjugated polymers of variable chemical structures at multiple levels relevant to biological interfacing, from fluorescence yield to their influence on cellular membrane potential. We systematically compared the performance of conjugated polymer as cast thin films and as nanoparticles stabilized with amphiphilic polyethylene glycol-poly lactic acid-co-glycolic acid (PEG-PLGA). We assessed in both the dark and under illumination the stability of key optoelectronic properties in various environments, including air and biologically relevant physiological saline solutions. We found that photoreduction of oxygen correlates with nanoparticle and film degradation in physiologically relevant media. Using patch-clamp recordings in cell lines and primary neurons, we identified two broad classes of membrane potential response, which correspond to photosensitizer- and photothermal-mediated effects. Last, we introduced a metric named OED50 (optical energy for 50% depolarization), which conveys the phototoxic potency of a given agent and thereby its operational photo-safety profile.

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“…In these regards, an interesting route would be the use of plasmonic materials or optical resonators that are spectrally tuned with P3HT absorption, so that their optical coupling would lead to an enhancement of the local electromagnetic field experienced by the polymer. Recently, metallic surfaces have been used to control the rate of P3HT photodegradation, , while the use of metamaterials to achieve field enhancement has been proposed for improving the power conversion efficiency in organic solar cells. , Some recent works investigated the optical response of such devices in biological processes. − However, to the best of our knowledge, such an approach has never been employed systematically to modulate the photodriven effects at the abiotic/biotic interface.…”

Section: Introductionmentioning

confidence: 99%

Resonant Enhancement of Polymer–Cell Optostimulation by a Plasmonic Metasurface

et al. 2022

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Organic semiconductors have shown great potential as efficient bioelectronic materials. Specifically, photovoltaic polymers such as the workhorse poly(thiophene) derivatives, when stimulated with visible light, can depolarize neurons and generate action potentials, an effect that has been also employed for rescuing vision in blind rats. In this context, however, the coupling of such materials with optically resonant structures to enhance those photodriven biological effects is still in its infancy. Here, we employ the optical coupling between a nanostructured metasurface and poly(3-hexylthiophene) (P3HT) to improve the bioelectronic effects occurring upon photostimulation at the abiotic−biotic interface. In particular, we designed a spectrally tuned aluminum metasurface that can resonate with P3HT, hence augmenting the effective field experienced by the polymer. In turn, this leads to an 8-fold increase in invoked inward current in cells. This enhanced activation strategy could be useful to increase the effectiveness of P3HT-based prosthetic implants for degenerative retinal disorders.

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Study of the effect of excited state concentration on photodegradation of the p3ht polymer

Cited by 6 publications

References 27 publications

Control of Physical and Chemical Processes with Nonlocal Metal–Dielectric Environments

Control of Physical and Chemical Processes with Nonlocal Metal–Dielectric Environments

Photosensitized and Photothermal Stimulation of Cellular Membranes by Organic Thin Films and Nanoparticles

Resonant Enhancement of Polymer–Cell Optostimulation by a Plasmonic Metasurface

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