High-performance triazole-containing brush polymers via azide–alkyne click chemistry: a new functional polymer platform for electrical memory devices

Abstract

Two series of well-defined brush polymers bearing a triazole moiety on each bristle were prepared from the click chemistry reactions of a poly(glycidyl azide) (PG) and a poly(4-azidomethylstyrene) (PS) with alkyne derivatives. The thin-film morphologies and properties, especially electrical memory performances, of these triazole-containing brush polymers were investigated in detail. The brush polymers with a triazole ring substituted with an alkyl or alkylenylphenyl group in the bristle exhibited only dielectric characteristics. By contrast, the other brush polymers bearing a triazole ring substituted with phenyl or its derivatives with a longer π-conjugation length in the bristle demonstrated excellent unipolar permanent memory behaviors with low power consumption, high ON/OFF current ratios and high stability and reliability under ambient air conditions. Furthermore, their memory type could be tuned to p-or n-type by the incorporation of an electron-donating or -accepting group into the phenyl unit linked to the triazole moiety. Overall, this study presents the first demonstration of the azide-alkyne click chemistry synthesis of triazole moieties with substituent(s) that exhibit a resonance effect; this approach is a very powerful synthetic route to develop electrical memory polymers suitable for the low-cost mass production of high-performance, polarity-free programmable memory devices.

High-performance stretchable resistive memories using donor–acceptor block copolymers with fluorene rods and pendent isoindigo coils

“…34 We demonstrated the formation of a donor-acceptor diblock copolymer system whose resistive switching behaviors can be manipulated for efficient digital information storage. Stretchable memory devices, moreover, were fabricated with volatile SRAM and nonvolatile WORM characteristics using PF 14 -b-Piso 10 and PF 14 -b-Piso 60 as the active materials, respectively. The stretchable devices were fabricated through a pre-strain method, 22 a common technique for generating organic stretchable electronics, including light-emitting diodes, 35 solar cells, 36 and memories; 22 the device configuration is illustrated in Figure 7a.…”

“…Both the PF 14 -b-Piso 10 -and PF 14 -b-Piso 60 -based devices were tested under 200 stretch/release cycles at 20 and 40% applied strain to determine the stability and reproducibility of the stretchable resistive memories. The ON/OFF ratio and threshold voltage of the PF 14 -b-Piso 10 and PF 14 -b-Piso 60 stretchable memories decreased slightly during the continuous stretching cycles because the conducting channel in the active layer may have been damaged under strain. Nevertheless, these electrical properties were still comparable to those of the device fabricated on a rigid ITO substrate, indicating the potential of the polymer-based devices for stretchable electronic applications.…”

“…1-3 Such memories can be switched between high and low resistance states (that is, OFF and ON states) by applying an external electric field. [4][5][6][7][8][9][10][11][12] Electrical memory characteristics can generally be divided into two categories, namely nonvolatile (for example, WORM (writeonce-read-many-times) and flash) and volatile memory (for example, dynamic random access memory and SRAM (static random access memory)), which show different tendencies for the stored charges to dispel. The volatility of these digital information storage devices can be controlled by (1) the charge transfer or charge trapping ability of the active materials and (2) the morphological packing structures in the memory layers.…”

Glycidyl Triazolyl Polymers: Poly(ethylene glycol) Derivatives Functionalized by Azide–Alkyne Cycloaddition Reaction

“…Ree and co‐workers also reported the synthesis of GTPs ( Figure , Polymers 24 and 25 ) . PECH was synthesized by the triphenylcarbenium hexafluorophosphate‐catalyzed cationic ring opening polymerization of epichlorohydrin.…”

Colorimetric Ion Sensors Based on Polystyrenes Bearing Side Chain Triazole and Donor-Acceptor Chromophores

“…[1][2][3][4][5] The most common click reaction must be the Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC), forming 1,4-disubstituted triazole rings. Although the resulting triazole polymers rarely show noticeable electrical properties, 6 some of the triazole polymers were employed as ion sensors (both metal ions and anions) due to the weak fluorescence of the triazole rings. 7,8 However, the absorption of the triazole derivatives was usually limited to the UV range, thus preventing the versatile visual detection of specific ions.…”