NIR‐Sensitive Poly(3,4‐ethylenedioxyselenophene) Derivatives for Transparent Photo‐Thermo‐Electric Converters

Kim, Byeonggwan; Shin, Haijin; Park, Teahoon; Lim, Hyunwoo; Kim, Eunkyoung

doi:10.1002/adma.201301834

Cited by 134 publications

(136 citation statements)

References 46 publications

(32 reference statements)

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“…Organic photothermal conversion functional materials, which could generate heat from infrared light, have aroused numerous interests since their great potential applications in various fields, [1] including photothermal therapy (PTT), [2] photothermal/photoacoustic (PT/PA) imaging, [3] photo-thermal-electric devices, [4] and shape-memory devices. [5] To date, organic PT materials are mainly porphysome, [6] indocynine green, [7] and polymers such as polyaniline [8] and polypyrrole.…”

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confidence: 99%

Cocrystals Strategy towards Materials for Near‐Infrared Photothermal Conversion and Imaging

et al. 2018

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A cocrystal strategy with a simple preparation process is developed to prepare novel materials for near-infrared photothermal (PT) conversion and imaging. DBTTF and TCNB are selected as electron donor (D) and electron acceptor (A) to self-assemble into new cocrystals through non-covalent interactions. The strong D-A interaction leads to a narrow band gap with NIR absorption and that both the ground state and lowest-lying excited state are charge transfer states. Under the NIR laser illumination, the temperature of the cocrystal sharply increases in a short time with high PT conversion efficiency (η=18.8 %), which is due to the active non-radiative pathways and inhibition of radiative transition process, as revealed by femtosecond transient absorption spectroscopy. This is the first PT conversion cocrystal, which not only provides insights for the development of novel PT materials, but also paves the way of designing functional materials with appealing applications.

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confidence: 99%

Cocrystals Strategy towards Materials for Near‐Infrared Photothermal Conversion and Imaging

et al. 2018

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“…The photothermal conversion efficiency of the polymer films was calculated modifying previous report of the solution state. [3,16] …”

Section: Methodsmentioning

confidence: 99%

Photo-Seebeck effect of conjugated polymers

2014

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Photo-Seebeck effect of conjugated polymers (CPs) from thiophenes and selenophenes were explored for a flexible energy conversion device. CP films were obtained by oxidative polymerizations, which grow conductive channels as polymerization proceeds. Through an optimized polymerization condition, highly conductive CP films were obtained with lower oxidation level. Taking advantage of their high electrical conductivity, the CP films were further explored as a transparent photo-thermo-electric film, because their absorption energy is easily controlled by the degree of oxidation or doping. Upon exposure to a near IR source, the CP films got heated, to result in temperature rise on a substrate. The generated heat was effectively converted into electricity to confirm a photo-Seebeck effect from the CP film under a light exposure. Efficient near-IR photothermal effect and heat to electric conversion have been realized in CP films that could benefit in exploiting multifunctional film displays, invisible NIR sensors, and hybrid energy harvesters.

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“…The polymer film exhibited the characteristic p-p* electronic transition bands in the visible-light region, maximized at 485 nm. [42] As the applied potential was increased from À0.2 to 1.0 V, the polaronic-band absorption was maximized when the film was doped at 0.5 V (Figure 5 B), and this may be ascribable to the maximum carrier generation of the doped P3MeT being achieved at 0.5 V. [43] The carrier concentration and the carrier mobility are closely related with the electrical conductivity, and thus contribute to high electrical conductivity. [44] However, similar absorption phenomena below À0.2 V and above 1.0 V were observed in UV/Vis/NIR, indicating a similar doping level at low (<-0.2 V) and high (> 1.0 V) potentials, respectively.…”

Section: In Situ Spectroelectrochemistrymentioning

confidence: 98%

Electrochemical Treatment for Effectively Tuning Thermoelectric Properties of Free‐Standing Poly(3‐methylthiophene) Films

Zhu

et al. 2016

ChemPhysChem

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The degree of oxidation of conducting polymers has great influence on their thermoelectric properties. Free-standing poly(3-methylthiophene) (P3MeT) films were prepared by electrochemical polymerization in boron trifluoride diethyl etherate, and the fresh films were treated electrochemically with a solution of propylene carbonate/lithium perchlorate as mediator. The conductivity of the resultant P3MeT films depends on the doping level, which is controlled by a constant potential from -0.5 to 1.4 V. The optimum electrical conductivity (78.9 S cm(-1) at 0.5 V) and a significant increase in the Seebeck coefficient (64.3 μV K(-1) at -0.5 V) are important for achieving an optimum power factor at an optimal potential. The power factor of electrochemically treated P3MeT films reached its maximum value of 4.03 μW m(-1) K(-2) at 0.5 V. Moreover, after two months, it still exhibited a value of 3.75 μW m(-1) K(-2) , and thus was more stable than pristine P3MeT due to exchange of doping ions in films under ambient conditions. This electrochemical treatment is a significant alternative method for optimizing the thermoelectric power factor of conducting polymer films.

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NIR‐Sensitive Poly(3,4‐ethylenedioxyselenophene) Derivatives for Transparent Photo‐Thermo‐Electric Converters

Cited by 134 publications

References 46 publications

Cocrystals Strategy towards Materials for Near‐Infrared Photothermal Conversion and Imaging

Cocrystals Strategy towards Materials for Near‐Infrared Photothermal Conversion and Imaging

Photo-Seebeck effect of conjugated polymers

Electrochemical Treatment for Effectively Tuning Thermoelectric Properties of Free‐Standing Poly(3‐methylthiophene) Films

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