Spectator cation size effect on the work function and stability of self-compensated hole-doped polymers

Ang, Mervin Chun-Yi; Koh, Qi-Mian; Tang, Cindy G.; Seah, Qiu-Jing; Wang, Yu; Callsen, Martin; Yu, Feng; Png, Rui‐Qi; Chua, Lay‐Lay

doi:10.1039/c9tc03884a

Cited by 11 publications

(17 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…mTFF is a member of the triarylamine-alt-fluorene (TAF) copolymers with 'tuneable' I E from 5.2 to 6.0 eV depending on pendant ring substitution. 18 As the HIL for mTFF, we used hole-doped pTFF-C 2 F 5 SIS, 24,25 a solution-processed selfcompensated polymer with stable ultrahigh work function of 5.9 eV and immunity to 'dopant migration'. 26,27 It furnishes an Ohmic hole contact to mTFF, with a pinned effective work function of 5.7 eV.…”

Section: Materials Selectionmentioning

confidence: 99%

“…N5 has the same polyfluorene semiconductor core and work function as N3, but a higher ion density for improved adhesion to ITO. 24,50 The JVL and Z-J characteristics are shown in Fig. 6c.…”

Section: Double Injection Heterostructures: Inverted Qledsmentioning

confidence: 99%

“…The blue-QD films were spin-cast in a glovebox. pTFF-C 2 F 5 SISNa was synthesized as reported by Ang et al 24,25 It was annealed at 120 1C for 1 h in a glovebox, then dissolved in anhydrous acetonitrile (ACN) to give a 100 mM solution. 0.9 equiv.…”

Section: Afterwordmentioning

confidence: 99%

See 2 more Smart Citations

Double-type-I charge-injection heterostructure for quantum-dot light-emitting diodes

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Materials Selectionmentioning

confidence: 99%

“…N5 has the same polyfluorene semiconductor core and work function as N3, but a higher ion density for improved adhesion to ITO. 24,50 The JVL and Z-J characteristics are shown in Fig. 6c.…”

Section: Double Injection Heterostructures: Inverted Qledsmentioning

confidence: 99%

See 1 more Smart Citation

Double-type-I charge-injection heterostructure for quantum-dot light-emitting diodes

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…In particular, the charged side chains impart strong electrostatic interactions within and between chains. − Thus, the structure of CPEs is controlled by a combination of aromatic interactions as well as electrostatic and hydrophobic forces. Leveraging these added ionic degrees of freedom, it has been demonstrated that the structure and electronic properties of CPE chains in both solution and solid films can be controlled by varying the charge-compensating counterion, ionic strength of the solvent, frequency and placement of ionic moieties, and added ionic additives. − …”

Section: Introductionmentioning

confidence: 99%

Role of Complexation Strength on the Photophysical and Transport Properties of Semiconducting Charged Polymer Complexes

Warner

Segalman

et al. 2023

Chem. Mater.

View full text Add to dashboard Cite

The high polymer fraction in complexes of conjugated and insulating polyelectrolytes offers unique opportunities for the fabrication of conductive thick films and bulk structures. The electrostatic interactions in these systems further provide a handle for controlling their structure and properties. The impact of charge-mediated complexation strength on the photophysical and electronic transport properties in blends of conjugated polyelectrolytes (CPEs) with oppositely charged polymeric ionic liquids (PILs) was examined. Complexes were formed with varying frequency of charged repeat units, from 50 to 100%, on an anionic polythiophene-based CPE and a complimentary cationic PIL. In highly charged complexes, the intimate mixing between the CPE and the PIL reduced the structural disorder along the CPE backbone, enhancing its intrachain conjugation and interchain stacking. In weakly charged complexes (<90%), these chain planarization effects were absent and microphase separation occurred. At all charge fractions examined, the electrical conductivity of an acid-doped complex was higher than that of the unblended constituent CPE. The highest electrical conductivity, near 1 S cm–1, was found for a charge fraction of 100%. These results demonstrate the potential for designing effective polymeric conductors using electrostatic complexation.

show abstract

“…The first series which yielded a selective 2,4-D nanosensor comprised cationic fluorene copolymerized with Py, Pz, Pm, or 1,3-P, respectively. Due to their strong π–π interactions with SWNTs, fluorene-based copolymers are highly capable of suspending SWNTs , and were used in selectively sorting semiconducting SWNTs from as-produced SWNTs, which usually contains a polydisperse mixture of approximately 33% metallic SWNTs. − When functionalized into a cationic form, these amphiphilic copolymers belong to the family of cationic conjugated polyelectrolytes, which are commonly used as opto-electronic device interlayers − and chemical and biological sensors. − The hydrophobic copolymer backbone is similarly capable of strong π–π interactions with SWNTs enabling surface adsorption, while the hydrophilic cationic side chains extend out into the solution, forming a stable corona with selective molecular recognition sites. The second series which yielded a selective NAA nanosensor comprises PVI and PVP polymer backbones (Figure b).…”

Section: Resultsmentioning

confidence: 99%

Nanosensor Detection of Synthetic Auxins In Planta using Corona Phase Molecular Recognition

et al. 2021

Self Cite

View full text Add to dashboard Cite

Synthetic auxins such as 1-naphthalene acetic acid (NAA) and 2,4-dichlorophenoxyacetic acid (2,4-D) have been extensively used in plant tissue cultures and as herbicides because they are chemically more stable and potent than most endogenous auxins. A tool for rapid in planta detection of these compounds will enhance our knowledge about hormone distribution and signaling and facilitate more efficient usage of synthetic auxins in agriculture. In this work, we show the development of real-time and nondestructive in planta NAA and 2,4-D nanosensors based on the concept of corona phase molecular recognition (CoPhMoRe), to replace the current state-of-the-art sensing methods that are destructive and laborious. By designing a library of cationic polymers wrapped around single-walled carbon nanotubes with general affinity for chemical moieties displayed on auxins and its derivatives, we developed selective sensors for these synthetic auxins, with a particularly large quenching response to NAA (46%) and a turn-on response to 2,4-D (51%). The NAA and 2,4-D nanosensors are demonstrated in planta across several plant species including spinach, Arabidopsis thaliana (A. thaliana), Brassica rapa subsp. chinensis (pak choi), and Oryza sativa (rice) grown in various media, including soil, hydroponic, and plant tissue culture media. After 5 h of 2,4-D supplementation to the hydroponic medium, 2,4-D is seen to accumulate in susceptible dicotyledon pak choi leaves, while no uptake is observed in tolerant monocotyledon rice leaves. As such, the 2,4-D nanosensor had demonstrated its capability for rapid testing of herbicide susceptibility and could help elucidate the mechanisms of 2,4-D transport and the basis for herbicide resistance in crops. The success of the CoPhMoRe technique for measuring these challenging plant hormones holds tremendous potential to advance the plant biology study.

show abstract

Spectator cation size effect on the work function and stability of self-compensated hole-doped polymers

Abstract: Spectator cations not only influence the ionization energy (and work function) of polyelectrolyte, but also, surprisingly determine the stability of the ultrahigh workfunction state.

Cited by 11 publications

References 27 publications

Double-type-I charge-injection heterostructure for quantum-dot light-emitting diodes

Double-type-I charge-injection heterostructure for quantum-dot light-emitting diodes

Role of Complexation Strength on the Photophysical and Transport Properties of Semiconducting Charged Polymer Complexes

Nanosensor Detection of Synthetic Auxins In Planta using Corona Phase Molecular Recognition

Contact Info

Product

Resources

About