Diketopyrrolopyrrole (DPP)‐Based Donor–Acceptor Polymers for Selective Dispersion of Large‐Diameter Semiconducting Carbon Nanotubes

Abstract

Low-bandgap diketopyrrolopyrrole (DPP)-based polymers are used for the selective dispersion of semiconducting single-walled carbon nanotubes (s-SWCNTs). Through rational molecular design to tune the polymer-SWCNT interactions, highly selective dispersions of s-SWCNTs with diameters mainly around 1.5 nm are achieved. The influences of the polymer alkyl side-chain substitution (i.e., branched vs linear side chains) on the dispersing yield and selectivity of s-SWCNTs are investigated. Introducing linear alkyl side chains allows increased polymer-SWCNT interactions through close π-π stacking and improved C-H-π interactions. This work demonstrates that polymer side-chain engineering is an effective method to modulate the polymer-SWCNT interactions and thereby affecting both critical parameters in dispersing yield and selectivity. Using these sorted s-SWCNTs, high-performance SWCNT network thin-film transistors are fabricated. The solution-deposited s-SWCNT transistors yield simultaneously high mobilities of 41.2 cm(2) V(-1) s(-1) and high on/off ratios of greater than 10(4) . In summary, low-bandgap DPP donor-acceptor polymers are a promising class of polymers for selective dispersion of large-diameter s-SWCNTs.

Inducing Elasticity through Oligo‐Siloxane Crosslinks for Intrinsically Stretchable Semiconducting Polymers

“…The tensile modulus of branched‐DPPTTEC, 20DPPTTEC, and 20DPPTTECx was measured by mechanical buckling metrology and provided in Figure e. We observed a slight increase in elastic modulus for 20DPPTTEC after incorporating linear side‐chains, possibly due to an increase in aggregation, consistent with decreased polymer solubility and higher Ð M measured by HT‐SEC. The elastic modulus of 20DPPTTECx, on the other hand, is ≈200 MPa lower despite being a crosslinked film, thus accounting for its improved ductility.…”

“…The large weight dispersity ( Ð M ) indicates that the polymers have a strong tendency to aggregate even at 180 °C. The higher the percentage of linear side‐chains, the greater the Ð M and degree of aggregation (Figure S17, Supporting Information). OFETs of the polymers all exhibited high hole mobilities above 1.0 cm 2 V −1 s −1 and on/off ratios above 10 5 .…”

Printable Semiconductors for Backplane TFTs of Flexible OLED Displays

“…The chiral selectivity depends strongly on the backbone chains of the conjugated polymers. Various conjugated polymers have been adopted for the selective dispersion, such as polyfluorene, polythiophene, polycarbazole, and diketopyrrolopyrrole, naphthalene diimide, isoindigo, and indacenodithiophene‐based D–A conjugated polymers ( Figure ). It was reported that the derivatives of wrapping copolymers can also achieve the sorted chiralities of SWNTs .…”

Enrichment of highly pure large-diameter semiconducting SWCNTs by polyfluorene-containing pyrimidine ring

“…Furthermore, the introduction of methyl groups for P1 increases the steric hindrance and thus, the conformation stability of the P1 molecules. 13 The total electron density calculation mapped with the electrostatic potentials (ESP) and the total energy of the three polymers are shown in Fig. 1b.…”

“…Previous studies have shown that conjugated polymers, such as uorene and uorene derivatives, have good selectivity for large-diameter carbon nanotubes. [12][13][14] In recent decades, Adronov et al reported that a large number of scientic studies have been proposed to investigate the performance of uorene derivatives for the separation and enrichment of sc-SWCNTs and m-SWCNTs. [15][16][17][18] Due to its large electronic delocalization system, uorene was found to combine with carbon nanotubes by p-p stacking.…”