Quantized conductance behaviour observed in an atomic switch using triptycene-based polymers

Mallik, Samapika; Samal, Priyanka Priyadarshani; Mahapatra, Anwesha; Pradhan, Itishree; Ansari, Mosim; Das, Neeladri; Mishra, Puneet; Tsuruoka, Tohru; Terabe, Kazuya; Nayak, Alpana

doi:10.1039/d2tc00771a

Cited by 5 publications

(9 citation statements)

References 37 publications

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“…The nucleation time (t n ) is defined as the time required to create the critical nucleus, and it allows the atomic arrangements until the stable configuration with minimum energy is reached. According to the atomistic nucleation model, the t n varies exponentially with voltage applied, t n = t 0 ( Z 0 , N ion ) exp [ false( N normalc + α false) e Δ ϕ K T ] where pre-exponential term t 0 depends on the nucleation site number density ( Z 0 ) and the number of ions ( N ion ). N c is the number of atoms constituting the critical nucleus, the cathodic transfer coefficient is α, e is the electron charge, Δϕ is the applied cathodic potential (Δϕ < 0), K is the Boltzmann constant, and T is the absolute temperature.…”

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Organic materials for resistive switching are highly promising due to their comparably low cost, flexibility, solution processability, possibility to tailor the structure and functionality during synthesis, and biocompatibility. Resistive switching devices based on organic materials have shown distinct multilevel conductance states, making them ideal for application in neuromorphic computing . However, control over the thickness and ordering in organic thin films, which is absolutely critical for reproducibility in filamentary switches, is still not well established.…”

Section: Discussionmentioning

confidence: 99%

“…Resistive switching devices based on organic materials have shown distinct multilevel conductance states, making them ideal for application in neuromorphic computing. 44 However, control over the thickness and ordering in organic thin films, which is absolutely critical for reproducibility in filamentary switches, is still not well established. Since the molecule investigated here has shown the highest electron mobility in the family of DLCs, 32 we anticipate that the facile method presented for producing robust, transparent free-standing films will enable their applications in flexible memristors and nanoelectromechanical systems.…”

Section: ■ Conclusionmentioning

confidence: 99%

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Non-Covalent Free-Standing Monolayer Nanoarchitectonics of Heterocoronene-Based Discotic Liquid Crystal Molecules

Kumar

Mahapatra

Paul

et al. 2023

ACS Appl. Electron. Mater.

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With excellent charge carrier mobility, tendency to form long-range assembly with self-healing ability, and remarkable chemical and mechanical stability, highly conjugated discotic molecules constitute an important class of materials for electronic applications. Here, we report formation of the stable free-standing molecular film of heterocoronene-based discotic liquid crystal (DLC) molecules, held solely by supra-molecular non-covalent interactions. The films of monolayer thickness (∼4 nm) were lifted from Langmuir trough directly onto a circular ring of diameter up to 2 mm as well as onto TEM grids. Films remain free-standing up to a macroscopic length scale, as revealed by optical and secondary electron microscopy, presumably due to the synergistic effect of intermolecular π−π interactions and the dispersion forces between the peripheral alkyl chains as well as their interdigitation. The monolayer is more than 97% transparent in the visible range. Further, resistive switching measurements carried out on the monolayer DLC film transferred on a silver substrate revealed electrochemical metallization to be the governing process. The switching time was found to decrease exponentially with voltage indicating nucleation to be a possible rate-limiting step. We anticipate that the method presented here will facilitate utilization of such non-covalent freestanding films in flexible memristor and nano-electromechanical systems.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: ■ Conclusionmentioning

confidence: 99%

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Non-Covalent Free-Standing Monolayer Nanoarchitectonics of Heterocoronene-Based Discotic Liquid Crystal Molecules

Kumar

Mahapatra

Paul

et al. 2023

ACS Appl. Electron. Mater.

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“…Our finding of N c = 0 is consistent with our previous reports on RbAg 4 I 5 and a triptycene-based polymer. 44,50 In both of these, the diffusion of the Ag + is not considered as the rate-limiting factor because the system is superionic in the case of RbAg 4 I 5 , and the availability of internal free volume provides easy ion diffusion in the case of a triptycene-based polymer. Similarly, in the present case, the AZO system contains Ag dopants (∼8 wt %), which creates easy ion migration under the effect of an electric field.…”

Section: E Amentioning

confidence: 99%

Liquid–Liquid Interface-Assisted Self-Assembly of Ag-Doped ZnO Nanosheets for Atomic Switch Application

Pradhan,

Mahapatra,

Samal

et al. 2023

J. Phys. Chem. Lett.

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Developing facile and inexpensive methods for obtaining large-area twodimensional semiconducting nanosheets is highly desirable for mass-scale device application. Here, we report a method for producing uniform and large-area films of a Ag-doped ZnO (AZO) nanosheet network via self-assembly at the hexane−water interface by controlling the solute/solvent ratio. The self-assembled film comprises of uniformly tiled nanosheets with size ∼1 μm and thicknesses∼60−100 nm. Using these films in a Pt/AZO/Ag structure, an atomic switch operation is realized. The switching mechanism is found to be governed by electrochemical metallization with nucleation as the rate-limiting step. Our results establish the protocol for large-scale device applications of AZO nanosheets for exploring advanced atomic switch-based neuromorphic systems.

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Responsive materials nanoarchitectonics at interfaces

Ariga

2024

Responsive Materials

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Advanced materials could perform functions in response to external stimuli. These are responsive materials. In order for us to develop advanced functional systems with a good responsive nature, we need to create a methodology that goes one step further. It is the artificial architecture of functional material systems based on the knowledge of nanotechnology. The task will be fulfilled by the new concept of nanoarchitectonics. Nanoarchitectonics integrates nanotechnology with various material sciences, basic chemistry, microfabrication techniques, and biological processes to architect functional material systems from atomic, molecular, and nanomaterial units. This review will deal with the nanoarchitectonics of responsive materials related with phenomena at interfaces. In order to demonstrate the effectiveness of responsive materials nanoarchitectonics at interfaces for functional systems of various sizes, this review article is organized by size for various functional systems. Specifically, this review has grouped them into (i) molecular level response, (ii) nanodevice level response, (iii) material level response, and (iv) living cell level response. If the social demand for these materials is fully recognized, such development is expected to efficiently progress. This review article would play a role in stimulating such development.

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Quantized conductance behaviour observed in an atomic switch using triptycene-based polymers

Abstract: A novel triptycene-based azo polymer (TBAP) was explored as a switching material in an atomic switch showing resistive change under voltage sweep and pulse. Current atomic force microscope (C-AFM) measurements...

Cited by 5 publications

References 37 publications

Non-Covalent Free-Standing Monolayer Nanoarchitectonics of Heterocoronene-Based Discotic Liquid Crystal Molecules

Non-Covalent Free-Standing Monolayer Nanoarchitectonics of Heterocoronene-Based Discotic Liquid Crystal Molecules

Liquid–Liquid Interface-Assisted Self-Assembly of Ag-Doped ZnO Nanosheets for Atomic Switch Application

Responsive materials nanoarchitectonics at interfaces

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