Redox‐Active Azulene‐based 2D Conjugated Covalent Organic Framework for Organic Memristors

Zhizheng, Zhao; Elkhouly, Mohamed; Che, Qiang; Sun, Fangcheng; Zhang, Bin; He, Hongyong; Chen, Yu

doi:10.1002/ange.202217249

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…In Figure a, the UV spectrum of the material without voltage displays a prominent absorption peak at 302 nm and a shoulder peak between 350 and 400 nm. The former is attributed to the π–π* transition of the benzene ring, while the latter is due to the S 0 to S 2 transition of electrons within the azulene moiety. , When a positive electric field of +0.5 V is applied, the absorption peak of 302 nm without an electric field shifts to 298 nm, and the shoulder peak at 369 nm experiences significant enhancement. Moreover, a new UV absorption peak appeared at 585 nm.…”

Section: Results and Discussionmentioning

confidence: 99%

Molecular-Potential and Redox Coregulated Cathodic Electrosynthesis toward Ionic Azulene-Based Thin Films for Organic Memristors

Zhang,

Wu,

et al. 2024

ACS Appl. Mater. Interfaces

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Organic memristors as promising electronic units are attracting significant attention owing to their simplicity of molecular structure design. However, fabricating high-quality organic films via novel synthetic technologies and exploring unprecedented chemical structures to achieve excellent memory performance in organic memristor devices are highly challenging. In this work, we report a cathodic electropolymerization to synthesize an ionic azulene-based memristive film (PPMAz-Py + Br − ) under the molecularpotential and redox coregulation. During the cathodic electropolymerization process, electropositive pyridinium salts migrate to the cathode under an electric field, undergo a reduction-coupling deprotonation reaction, and polymerize into a uniform film with a controllable thickness on the electrode surface. The prepared Al/PPMAz-Py + Br − /ITO devices not only exhibit a high ON/OFF ratio of 1.8 × 10 3 , high stability, long memory retention, and endurance under a wide range of voltage scans, but also achieve excellent multilevel storage and history-dependent memristive performance. In addition, the devices can mimic important biosynaptic functions, such as learning/forgetting function, synaptic enhancement/inhibition, pairedpulse facilitation/depression, and spiking-rate-dependent plasticity. The tunable memristive performances are attributed to the capture of free electrons on pyridinium cations, the migration of the aluminum ions (Al 3+ ), and the form of Al conductive filaments under voltage scans.

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Section: Results and Discussionmentioning

confidence: 99%

Molecular-Potential and Redox Coregulated Cathodic Electrosynthesis toward Ionic Azulene-Based Thin Films for Organic Memristors

Zhang,

Wu,

et al. 2024

ACS Appl. Mater. Interfaces

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Energy Efficient Memristor Based on Green‐Synthesized 2D Carbonyl‐Decorated Organic Polymer and Application in Image Denoising and Edge Detection: Toward Sustainable AI

Pal,

Li,

Al‐Ajeil

et al. 2024

Advanced Science

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According to the United Nations, around 53 million metric tons of electronic waste is produced every year, worldwide, the big majority of which goes unprocessed. With the rapid advances in AI technologies and adoption of smart gadgets, the demand for powerful logic and memory chips is expected to boom. Therefore, the development of green electronics is crucial to minimizing the impact of the alarmingly increasing e‐waste. Here, it is shown the application of a green synthesized, chemically stable, carbonyl‐decorated 2D organic, and biocompatible polymer as an active layer in a memristor device, sandwiched between potentially fully recyclable electrodes. The 2D polymer's ultramicro channels, decorated with C═O and O─H groups, efficiently promote the formation of copper nanofilaments. As a result, the device shows excellent bipolar resistive switching behavior with the potential to mimic synaptic plasticity. A large resistive switching window (103), low SET/RESET voltage of ≈0.5/−1.5 V), excellent device‐to‐device stability and synaptic features are demonstrated. Leveraging the device's synaptic characteristics, its applications in image denoising and edge detection is examined. The results show a reduction in power consumption by a factor of 103 compared to a traditional Tesla P40 graphics processing unit, indicating great promise for future sustainable AI‐based applications.

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Dual Redox‐active Covalent Organic Framework‐based Memristors for Highly‐efficient Neuromorphic Computing

Zhang,

Che,

et al. 2024

Angewandte Chemie

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Organic memristors based on covalent organic frameworks (COFs) exhibit significant potential for future neuromorphic computing applications. The preparation of high‐quality COF nanosheets through appropriate structural design and building block selection is critical for the enhancement of memristor performance. In this study, a novel room‐temperature single‐phase method was used to synthesize Ta‐Cu3 COF, which contains two redox‐active units: trinuclear copper and triphenylamine. The resultant COF nanosheets were dispersed through acid‐assisted exfoliation and subsequently spin‐coated to fabricate a high‐quality COF film on an indium tin oxide (ITO) substrate. The synergistic effect of the dual redox‐active centers in the COF film, combined with its distinct crystallinity, significantly reduces the redox energy barrier, enabling the efficient modulation of 128 non‐volatile conductive states in the Al/Ta‐Cu3 COF/ITO memristor. Utilizing a convolutional neural network (CNN) based on these 128 conductance states, image recognition for ten representative campus landmarks was successfully executed, achieving a high recognition accuracy of 95.13% after 25 training epochs. Compared to devices based on binary conductance states, the memristor with 128 conductance states exhibits a 45.56% improvement in recognition accuracy and significantly enhances the efficiency of neuromorphic computing.

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Redox‐Active Azulene‐based 2D Conjugated Covalent Organic Framework for Organic Memristors

Cited by 4 publications

References 37 publications

Molecular-Potential and Redox Coregulated Cathodic Electrosynthesis toward Ionic Azulene-Based Thin Films for Organic Memristors

Molecular-Potential and Redox Coregulated Cathodic Electrosynthesis toward Ionic Azulene-Based Thin Films for Organic Memristors

Energy Efficient Memristor Based on Green‐Synthesized 2D Carbonyl‐Decorated Organic Polymer and Application in Image Denoising and Edge Detection: Toward Sustainable AI

Dual Redox‐active Covalent Organic Framework‐based Memristors for Highly‐efficient Neuromorphic Computing

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