Direct photopolymerization and lithography of multilayer conjugated polymer nanofilms for high performance memristors

Yin, Yuhang; Liu, Zhengdong; Song, Mengya; Ju, Shang; Wang, Xiangjing; Zhou, Zhe; Mao, Huiwu; Ding, Yamei; Liu, Juqing; Huang, Wei

doi:10.1039/c8tc04333g

Cited by 24 publications

(15 citation statements)

References 41 publications

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“…In addition, these ionic films were compatible with different types of electrodes and could thus be assembled into various devices including solar cells and light-emitting diode devices, with high power conversion efficiency. [101,103,184] On the other hand, Huang and co-workers [181] proposed a universal surface-assisted oxidative polymerization strategy for preparing large-area ultrathin 2D CMPs on arbitrary substrates. The as-synthesized 2D CMPs (Figure 12c) with average thickness of 1.5-3.6 nm were applied in an organic vertical field-effect transistor and exhibited typical p-type behavior with high reproducibility and on/off current ratio of 4.82 × 10 3 .…”

Section: Photovoltaicsmentioning

confidence: 99%

Macroscale Conjugated Microporous Polymers: Controlling Versatile Functionalities Over Several Dimensions

et al. 2022

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covalently bonded organic moieties. Because of their unique properties derived from their tunable porous structures and the multiple functional groups, which can be included in their backbones, POPs have been actively investigated for multiple applications including gas storage/separation, [2,3] catalysis, [4][5][6] optoelectronics, [7,8] sensing, [9][10][11] energy storage, and conversion. [12,13] Aside from their high specific surface areas, they furthermore show excellent chemical stability, light-weight and a versatile chemistry for modification and functionalization. POPs can be further classified into two categories based on their crystallinity. Crystalline POPs are usually summarized under the name covalent organic frameworks [14][15][16] (COFs). Amorphous POPs are further divided, based on their structure or construction principles into hyper-crosslinked polymers [17,18] (HCPs), polymers of intrinsic microporosity [19,20] (PIMs), porous aromatic frameworks [21,22] (PAFs), and others. Recent research has seen increasing interest on amorphous POPs, especially when their skeleton is π-conjugated. In these highly porous networks, π-conjugation is superimposed with meso-/microporosities, i.e., electron transport in the polymer backbone is accompanied by mass transport in the porous system, which enable many intriguing properties and applications, e.g., in energy storage and conversion, [23,24] or optoelectronics. [25,26] As such, the importance of π-conjugation in porous polymer networks has defined another emerging functional POP class-the conjugated microporous polymers (CMPs). As mentioned, such CMPs [27] are a unique class of POPs exhibiting extended π-conjugated structures and permanent nanopores (Table S1). Earlier, McKeown et al. [28] discussed an important concept of preparing robust nanoporous materials by the covalent binding of planar molecules via a rigid spirocyclic linker. In 2007, Cooper et al. [29] reported a highly cross-linked, microporous poly(arylene ethynylene)s network, thus the first microporous polymer network with distinct π-conjugation and introduced the term "conjugated microporous polymer (CMP)" for this class of materials. Since their discovery, CMPs chemistry has intrigued scientists across the globe and been promoted rapidly, resulting in a strong growth in publications over the last decade. For instance, Thomas et al. [30] reported a spirobifluorene-type CMP with stable interface and application potential in organic light emitting diodes Since discovered in 2007, conjugated microporous polymers (CMPs) have been developed for numerous applications including gas adsorption, sensing, organic and photoredox catalysis, energy storage, etc. While featuring abundant micropores, the structural rigidity derived from CMPs' stable π-conjugated skeleton leads to insolubility and thus poor processability, which severely limits their applicability, e.g., in CMP-based devices. Hence, the development of CMPs whose structure can not only be controlled on the micro-but also on the macroscale have...

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Section: Photovoltaicsmentioning

confidence: 99%

Macroscale Conjugated Microporous Polymers: Controlling Versatile Functionalities Over Several Dimensions

et al. 2022

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“…[ 13,14 ] In order to enhance the thermal stability of polymer materials, several polymers containing rigid carbon‐rich aromatic structures have been designed and prepared, such as polyimides and cross‐linked polymers. [ 15,16 ] However, their low soluble property in common organic solvent are impeding the solution process of target device with high repeatability. To this end, diarylfluorene‐based π‐conjugation‐interrupted hyperbranched polymers (CIHPs) are developed to prepare high‐performance polymer optoelectronics, such as polymer light‐emitting devices, organic laser, and organic transistors.…”

Section: Figurementioning

confidence: 99%

Flexible Metal‐Free Memory Electronic Made of π‐Conjugation‐Interrupted Hyperbranched Polymer Switch and Reduced Graphene Oxide Electrodes

Liu

Song

Yin

et al. 2020

Macro Materials & Eng

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A flexible metal‐free flash memory device with reduced graphene oxide films as electrodes and diarylfluorene‐based π‐conjugation‐interrupted hyperbranched polymers (CIHPs) as active switches is reported. Two CIHPs, named PCzPF and PCzPF‐PF, are synthesized via BF3•Et2O‐catalyzed fluorenol’s Friedel–Crafts reaction, where the PCzPF‐PF is designed by the decoration of hindrance functional groups, i.e., bulky 9‐phenyl‐fluorenyl (PF) moieties, at the end‐groups of PCzPF. Both of the two CIHPs exhibit excellent solubility and thermal stability. The PCzPF‐based device exhibits no switching effect while the PCzPF‐PF‐based device shows a flash type memory effect, indicating the incorporation of PF groups plays a critical role in realizing electrically bistable behaviors. In particular, the optimized memory exhibits a high ON/OFF ratio of > 3.0 × 103, long retention time of up to 1.2 × 104 s, and high mechanical stability. This work opens a new avenue for metal‐free memory electronics through a low‐cost and full‐solution process approach.

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“…S2 †), which were prepared with the assistance of suitable photomasks. 29,30 Impressively, the CNF-800 exhibited pleasurable thermal stability under 800 C while the monomer lm was vanished undergoing the identical procedure ( Fig. S3 and S4 †).…”

Section: Introductionmentioning

confidence: 96%

“…Recently, our group has reported the controllable preparation of large-area patterned CMP lms via in situ photopolymerization, which promoted the progress of large-area polymer electronics with integrated ability. 29,30 However, the conductance of these as-produced large-area patterned CMP lms were hard to be tuned and showed limited optoelectrical properties. Therefore, the electrical modulation of large-area ultrathin CMP lm holds great importance in their fundamental study and technical advancement of high performance carbon electronics.…”

Section: Introductionmentioning

confidence: 99%

Preparation of large-area ultrathin carbon semiconductors converted from conjugated microporous polymer films

Ding

Yin

et al. 2019

RSC Adv.

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Direct photopolymerization and lithography of multilayer conjugated polymer nanofilms for high performance memristors

Abstract: Multilayer conjugated polymer nanofilms with desirable patterns and thicknesses were prepared by combining direct photopolymerization and in situ growth. Their optimized devices exhibited high performance nonvolatile memory effect.

Cited by 24 publications

References 41 publications

Macroscale Conjugated Microporous Polymers: Controlling Versatile Functionalities Over Several Dimensions

Macroscale Conjugated Microporous Polymers: Controlling Versatile Functionalities Over Several Dimensions

Flexible Metal‐Free Memory Electronic Made of π‐Conjugation‐Interrupted Hyperbranched Polymer Switch and Reduced Graphene Oxide Electrodes

Preparation of large-area ultrathin carbon semiconductors converted from conjugated microporous polymer films

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