Phototunable memories and reconfigurable logic applications based on natural melanin

Chen, Meng; Lv, Ziyu; Qian, Fangsheng; Wang, Yan; Xing, Xiaofei; Zhou, Kui; Wang, Junjie; Huang, Shenming; Han, Su‐Ting; Zhou, Ye

doi:10.1039/d1tc00052g

Cited by 19 publications

(9 citation statements)

References 59 publications

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“…As the most representative compound to natural melanin, polydopamine (PDA) due to its unique chemical structure and physical characteristics has aroused great interest for various outstanding properties, such as broadband spectral absorption, metal chelation, , antioxidation, and photothermal conversion. − Particularly, the outstanding light absorption property and nonradiative-dominated exciton decay process of PDA are greatly beneficial for solar energy collection and utilization. However, the absorption decay phenomenon across 200–1400 nm, especially for the visible light, severely hindered the utilization for solar energy. − Actually, our group reported our first work to enhance the visible light absorption of PDA by forming conjugated microstructures in PDA through aminoxyl oxidation. However, because the strong oxidative properties of aminoxyl radicals may damage the internal structure of PDA, we still need more kinds of engineering strategies under mild conditions .…”

Section: Introductionmentioning

confidence: 99%

Molecular Hyperpolarization-Directed Photothermally Enhanced Melanin-Inspired Polymers

et al. 2022

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Constructing a donor–acceptor (D–A) structure is a common strategy to change the polarizability and dipole moment of local molecules and induce the re-hybridization of molecular orbitals, which could lead to the reduction of the bandgap and promote the transfer of electrons. Although such a strategy has been successfully applied in organic optoelectronics with well-defined molecular structures, very limited progress has been reported for polymers with disordered and complex structures. In this work, we strived to employ this strategy to manipulate the light absorption and photothermal behaviors of melanin-inspired, polydopamine (PDA), a typical kind of electron-rich molecular systems by involving a strong receptor unit, trichloroisocyanuric acid through covalent connection to construct D–A pairs. This design could decrease the bandgap and improve the optical absorption by orbital re-hybridization, which has been carefully verified by detailed spectral analysis and simulated calculation. The remarkable photothermal performances present promising potential in photothermal Marangoni actuators and solar power generation and provided new opportunities for the rational design of the microstructure of melanin.

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Section: Introductionmentioning

confidence: 99%

Molecular Hyperpolarization-Directed Photothermally Enhanced Melanin-Inspired Polymers

et al. 2022

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“…The device can achieve switchable NAND and NOR operations. [ 17 ] However, protein‐based artificial synapses with stable synaptic performances, particularly LTD/LTP for neuromorphic computing, have yet to come. Egg albumen has been employed to develop memristor devices due to its easy extraction, high transparency, easy processing, low cost, and excellent dielectric properties.…”

Section: Introductionmentioning

confidence: 99%

Soft Biomaterials Based Flexible Artificial Synapse for Neuromorphic Computing

Guo

Sun

et al. 2022

Adv Elect Materials

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Artificial synapses are vital for neuromorphic computing chips that can potentially revolutionize von Neumann systems. Biomaterials‐based bio‐memristors have been investigated as synaptic emulators to develop neuromorphic computing chips due to their biocompatibility, degradability, flexibility, and low costs. However, the existing biomaterials‐based artificial synapses suffer from limited biological synapse functions, insufficient reliability, and poor endurance. Particularly, protein‐based artificial synapse with stable synaptic performances of long‐term potentiation/depression (LTP/LTD) for neuromorphic computing is challenging. Here, the soft material of egg albumen@CuO are employed to develop an artificial synapse. The device can mimic bio‐synaptic functionalities, including the excitatory postsynaptic current (EPSC), spike‐number‐dependent plasticity (SNDP), paired‐pulse facilitation (PPF), and LTP/LTD. High accuracy of 95% has been obtained by the neuromorphic computing simulation for pattern recognition. Combining with density functional theory calculations, multiphysics simulations, and electrical measurements, the analog resistive switching mechanism is attributed to electron hopping. In addition, the device is flexible and can be used to develop wearable systems. The results shed light on the biocompatible and wearable neuromorphic computing chips.

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“…Now, the chemical or enzymatic oxidation products formed from the small neurotransmitter molecule DA further undergo aggregation through covalent or noncovalent interactions to produce polymeric structures, called polydopamine (polyDopa or PDA). − This polymeric nanomaterial, PDA, possesses melanin-like structures, and thus it is often termed as synthetic melanin. − Now, the natural pigments, melanins, are generally dark polymeric materials, having structural and biological heterogeneity − and a wide range of applications. − Consequently, PDA with melanin-type characteristics acquires almost similar types of applications in the fields of both biomedicine , and optoelectronics , and therefore becomes one of the most promising nanomaterials to be disclosed. However, its almost nonfluorescent nature and extremely insignificant fluorescence quantum yield restrict its use as a conventional bioimaging agent.…”

Section: Introductionmentioning

confidence: 99%

“…26−30 Now, the natural pigments, melanins, are generally dark polymeric materials, having structural and biological heterogeneity 31−34 and a wide range of applications. 31−38 Consequently, PDA with melanin-type characteristics acquires almost similar types of applications in the fields of both biomedicine 28,29 and optoelectronics 37,38 and therefore becomes one of the most promising nanomaterials to be disclosed. However, its almost nonfluorescent nature and extremely insignificant fluorescence quantum yield restrict its use as a conventional bioimaging agent.…”

Section: Introductionmentioning

confidence: 99%

Influence of a Polyneurotransmitter on DNA-Mediated Förster-Based Resonance Energy Transfer: A Path Leading to White Light Generation

et al. 2021

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The physiologically important biomolecule, dopamine (DA), shows strong self-oxidation and aggregation behaviors, which have been controlled and modulated to result in fluorescent polydopamine (F-PDA) nanoparticles. On the other hand, the simultaneous binding of two diverse deoxyribonucleic acid (DNA) binding probes, 4′,6-diamidino-2-phenylindole dihydrochloride (DAPI) and ethidium bromide (EtBr), has been elaborately established to follow the Forsterbased resonance energy transfer (FRET) pathway. The comparative understanding of this DNA-mediated FRET in three media, phosphate buffer saline (PBS) of pH 7.4, DA, and F-PDA, has concluded that the FRET efficiency in the three media follows the order: PBS > DA > F-PDA. This controlled FRET in the fluorescent F-PDA matrix serves a pivotal role for efficient white light (WL) generation with excellent Commission Internationale de l'Eclairage (CIE) parameters that match well with that of pure WL emission. The obtained WL emission has been shown to be very specific with respect to concentrations of different participating components and the excitation wavelength of the illuminating source. Furthermore, the optical properties of the WL emitting solution have been observed to be retained excellently inside the well-known agarose gel matrix. Finally, the mechanistic pathway behind such a FRET-based WL generation has been established in detail, and to the best of our knowledge, the current study offers the first and only report that discloses the influence of a fluorescent polyneurotransmitter matrix for successful generation of WL emission.

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Phototunable memories and reconfigurable logic applications based on natural melanin

Abstract: The saturation of Moore’s law and the finality of Dennard scaling mark the requirements for new data-storage approaches employing different physical mechanisms. Due to the low operation voltage, multibit storage...

Cited by 19 publications

References 59 publications

Molecular Hyperpolarization-Directed Photothermally Enhanced Melanin-Inspired Polymers

Molecular Hyperpolarization-Directed Photothermally Enhanced Melanin-Inspired Polymers

Soft Biomaterials Based Flexible Artificial Synapse for Neuromorphic Computing

Influence of a Polyneurotransmitter on DNA-Mediated Förster-Based Resonance Energy Transfer: A Path Leading to White Light Generation

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