Finely tuned digital memory modes and performances in diblock copolymer devices by well-defined lamellar structure formation and orientation control

Wi, Dongwoo; Kim, Jong-Hyun; Lee, Hoyeol; Kang, Nam‐Goo; Lee, Jin-Seok; Kim, Myung-Jin; Lee, Jae‐Suk; Ree, Moonhor

doi:10.1039/c5tc04342e

Cited by 12 publications

(7 citation statements)

References 55 publications

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“…To give a more refined classification, OIMs can be divided into organic ionic small molecules and polymers, including ionic liquids, [79][80][81] polymeric ionic liquids, 82 ionic gels, 160 ionic conducting polymers, [83][84][85][86] coordination compounds (e.g., metal-organic frameworks (MOFs)), [87][88][89] some specific complexes, and so on. 84,[90][91][92][93]161 All of these categories are introduced as follows (Fig.…”

Section: Specific Categories Of Oimsmentioning

confidence: 99%

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Organic iontronic memristors for artificial synapses and bionic neuromorphic computing

Xia,

Zhang,

et al. 2024

Nanoscale

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Section: Specific Categories Of Oimsmentioning

confidence: 99%

“…In addition, this kind of polymer generally exhibits exceptional conductivity and good durability. [83][84][85][86] (e) Ionic coordination compounds represent a category of structures wherein metal atoms and organic Fig. 3 Different types of ionic memristive materials.…”

Section: Specific Categories Of Oimsmentioning

confidence: 99%

Organic iontronic memristors for artificial synapses and bionic neuromorphic computing

Xia,

Zhang,

et al. 2024

Nanoscale

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“…Another block copolymers, poly(2‐vinyl‐9‐phenylcarbazole) (PVPK‐ b ‐P2VP), synthesized by living anionic polymerization and PVPK‐ b ‐QP2VP (pyridine nitrogen of P2VP quaternized by CH 3 I), were employed as electroactive materials in non‐volatile organic memory devices . The block copolymers exhibited solvent‐dependent controllable morphologies upon annealing.…”

Section: Functional Block Copolymers From Triphenylamine Carbazole mentioning

confidence: 99%

“…The cylindrical PGBPRK or PGRBPK in a PGROH matrix showed insulator properties. The electrons was predominantly trapped and transported by the carbazole‐containing block …”

Section: Functional Block Copolymers From Triphenylamine Carbazole mentioning

confidence: 99%

Precise Synthesis of Functional Block Copolymers by Living Anionic Polymerization of Vinyl Monomers Bearing Nitrogen Atoms in the Side Chain

Kim

Kang

et al. 2017

Macro Chemistry & Physics

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Precise synthetic methods to prepare functional block copolymers with heteroatoms (nitrogen, oxygen, sulfur, phosphorous, halogen, etc.) have received much attention for the fabrication of practical nanomaterials. Specifically, well-defined materials containing nitrogen-based functional groups show unique electrical, optical, and amphiphilic properties. To synthesize these products, living anionic polymerization is the most powerful method. However, the disruption of undesirable reactions is considered to be a great challenge in the anionic polymerization of functional monomers with heteroatoms. To overcome these problems, facile methods such as polymerization at low temperature, careful choice of additives and initiators, and the introduction of protective groups can be used. In this review, recent advances in the anionic polymerization of vinyl monomers with triphenylamine, carbazole, and pyridine moieties in the side chains will be discussed. Also covered is the morphological control of these polymers to obtain well-defined block copolymers for practical applications such as organic memory devices and light emitting diodes.

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“…Block copolymers have been of great importance for the past several decades because of their self-assembly into arrays of ordered nanoscopic structures such as lamellae, hexagonally packed cylinders, body-centered cubic spheres, double gyroids, other network structures, and Frank-Kasper phases [ 1 , 2 , 3 , 4 ]. Block copolymers are used in diverse areas and applications such as elastomers, surface modifiers, blend compatibilizers, and templates for directing structured materials towards data storage, nanolithography, and nanopattern transfer [ 5 , 6 , 7 , 8 , 9 ]. Block copolymers in selective solvents can be useful for drug delivery, cancer theranostics, nanoreactors, and stimuli-responsive materials [ 10 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Disparity in Self Dispersion Interactions on Phase Behaviors of Molten A-b-B Diblock Copolymers

2022

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Phase behaviors of molten A-b-B diblock copolymers with disparity in self dispersion interactions are revisited here. A free energy functional is obtained for the corresponding Gaussian copolymers under the influence of effective interactions originating in the localized excess equation of state. The Landau free energy expansion is then formulated as a series in powers of A and B density fluctuations up to 4th order. An alternative and equivalent Landau energy is also provided through the transformation of the order parameters to the fluctuations in block density difference and free volume fraction. The effective Flory χ is elicited from its quadratic term as the sum of the conventional enthalpic χH and the entropic χS that is related to energetic asymmetry mediated by copolymer bulk modulus. It is shown that the cubic term is balanced with Gaussian cubic vertex coefficients in corporation with energetics to yield a critical point at a composition rich in a component with stronger self interactions. The full phase diagrams with classical mesophases are given for the copolymers exhibiting ordering upon cooling and also for others revealing ordering reversely upon heating. These contrasting temperature responses, along with the skewness of phase boundaries, are discussed in relation to χH and χS. The pressure dependence of their ordering transitions is either barotropic or baroplastic; or anomalously exhibits anomalously both at different stages. These actions are all explained by the opposite responses of χH and χS to pressure.

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Finely tuned digital memory modes and performances in diblock copolymer devices by well-defined lamellar structure formation and orientation control

Cited by 12 publications

References 55 publications

Organic iontronic memristors for artificial synapses and bionic neuromorphic computing

Organic iontronic memristors for artificial synapses and bionic neuromorphic computing

Precise Synthesis of Functional Block Copolymers by Living Anionic Polymerization of Vinyl Monomers Bearing Nitrogen Atoms in the Side Chain

Effect of Disparity in Self Dispersion Interactions on Phase Behaviors of Molten A-b-B Diblock Copolymers

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