Molecular understanding of a π-conjugated polymer/solid-state ionic liquid complex as a highly sensitive and selective gas sensor

Stewart, Katherine M. E.; Limbu, Saurav; Nightingale, James; Pagano, Katia; Park, Byoungwook; Hong, Soon-Il; Lee, Kwanghee; Kwon, Sooncheol; Kim, Jinhyun

doi:10.1039/d0tc03093g

Cited by 31 publications

(40 citation statements)

References 45 publications

(57 reference statements)

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“…15 and Supplementary Table 1 for detailed assignment). In neat films, MPTA shows much stronger and sharper core unit peaks, indicating enhanced π-electron density in the fused donor unit compared to non-fused donor in NP-SA [52][53][54] . Blending with C 60 leads to completely different changes in their vibrational modes.…”

Section: Npmentioning

confidence: 99%

Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin

Labanti

Shin

et al. 2022

Nat Commun

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Organic photodetectors (OPDs) exhibit superior spectral responses but slower photoresponse times compared to inorganic counterparts. Herein, we study the light-intensity-dependent OPD photoresponse time with two small-molecule donors (planar MPTA or twisted NP-SA) co-evaporated with C60 acceptors. MPTA:C60 exhibits the fastest response time at high-light intensities (>0.5 mW/cm2), attributed to its planar structure favoring strong intermolecular interactions. However, this blend exhibits the slowest response at low-light intensities, which is correlated with biphasic photocurrent transients indicative of the presence of a low density of deep trap states. Optical, structural, and energetical analyses indicate that MPTA molecular packing is strongly disrupted by C60, resulting in a larger (370 meV) HOMO level shift. This results in greater energetic inhomogeneity including possible MPTA-C60 adduct formation, leading to deep trap states which limit the low-light photoresponse time. This work provides important insights into the small molecule design rules critical for low charge-trapping and high-speed OPD applications.

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Section: Npmentioning

confidence: 99%

Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin

Labanti

Shin

et al. 2022

Nat Commun

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“…Under resonant Raman conditions, the intensity of the peaks largely depends on the number of neutral species that has a ground state π-π* electronic transition around 488 nm. [49,50,52] Hence, the intensity quenching is explained by the transformation of neutral to polaron species, which is no longer in resonance with the excitation wavelength. To quantify the degree of spectral quenching, the changes in Raman intensity for peaks 1-3 are extracted and shown in Figure 4d.…”

Section: In Situ Structural Analysis Upon Electrolyte Immersion and P...mentioning

confidence: 99%

The Role of Long‐Alkyl‐Group Spacers in Glycolated Copolymers for High‐Performance Organic Electrochemical Transistors

Kim

Stewart

et al. 2022

Advanced Materials

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Semiconducting polymers with oligoethylene glycol (OEG) sidechains have attracted strong research interest for organic electrochemical transistor (OECT) applications. However, key molecular design rules for high-performance OECTs via efficient mixed electronic/ionic charge transport are still unclear. In this work, new glycolated copolymers (gDPP-TTT and gDPP-TTVTT) with diketopyrrolopyrrole (DPP) acceptor and thiophene (T) and vinylene (V) thiophene-based donor units are synthesized and characterized for accumulation mode OECTs, where a long-alkyl-group (C 12 ) attached to the DPP unit acts as a spacer distancing the OEG groups from the polymer backbone. gDPP-TTVTT shows the highest OECT transconductance (61.9 S cm -1 ) and high operational stability, compared to gDPP-TTT and their alkylated counterparts. Surprisingly, gDPP-TTVTT also shows high electronic charge mobility in a field-effect transistor, suggesting efficient ion injection/diffusion without hindering its efficient electronic charge transport. The elongated donor unit (TTVTT) facilitates hole polaron formation to be more localized to the donor unit, leading to faster and easier polaron formation with less impact on polymer structure during OECT operation, as opposed to the TTT unit. This is supported by molecular dynamics simulation. These simultaneously high electronic and ionic charge-transport properties are achieved due to the long-alkyl-group spacer in amphipathic sidechains, providing an important molecular design rule for glycolated copolymers.

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“…In 2020, Stewart et al developed a volatile organic compound (VOC) gas sensor with highly sensitive and selective characteristics using p-conjugated polymer (P3HT)/solid-state ionic liquid (SSIL) blends. They determined that the strong chemical interaction between π-CP and SSIL adjusts the conductivity by applying an electric field ( Stewart et al, 2020 ). The sensor will exhibit different conductivity and transmit signals to distinguish different substances under exposure with VOCs of different polarity.…”

Section: Sensorsmentioning

confidence: 99%

Conjugated Conductive Polymer Materials and its Applications: A Mini-Review

Xun-lai

Liu

2021

Front. Chem.

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Since their discovery 50 years ago, conjugated conducting polymers have received increasing attention owing to their unique conductive properties and potential applications in energy storage, sensors, coatings, and electronic devices such as organic field-effect transistors, photovoltaic cells, and light-emitting devices. Recently, these materials have played a key role in providing a more comfortable environment for humans. Consequently, the development of novel, high-performance conjugated conductive materials is crucial. In this mini-review, the progress of conjugated conductive materials in various applications and the relationship between the chemical structures and their performances is reviewed. This can aid in the molecular design and development of novel high-performance conjugated polymer materials.

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Molecular understanding of a π-conjugated polymer/solid-state ionic liquid complex as a highly sensitive and selective gas sensor

Abstract: An electric-field driven chemical doping modulation in a blend of solution-processed organic semiconductors (OSC) and solid-state ionic liquids (SSIL) in response to volatile organic compounds (VOC) provides a new exciting...

Cited by 31 publications

References 45 publications

Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin

Light-intensity-dependent photoresponse time of organic photodetectors and its molecular origin

The Role of Long‐Alkyl‐Group Spacers in Glycolated Copolymers for High‐Performance Organic Electrochemical Transistors

Conjugated Conductive Polymer Materials and its Applications: A Mini-Review

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