Graphene Nanoribbons: On‐Surface Synthesis and Integration into Electronic Devices

Advanced Materials, Год журнала: 2020, Номер 32(45)

Опубликована: Сен. 18, 2020

Abstract Graphene nanoribbons (GNRs) are quasi‐1D graphene strips, which have attracted attention as a novel class of semiconducting materials for various applications in electronics and optoelectronics. GNRs exhibit unique electronic optical properties, sensitively depend on their chemical structures, especially the width edge configuration. Therefore, precision synthesis with chemically defined structures is crucial fundamental studies well device applications. In contrast to top‐down methods, bottom‐up using tailor‐made molecular precursors can achieve atomically precise GNRs. Here, metal surfaces under ultrahigh vacuum (UHV) vapor deposition (CVD) conditions main focus, recent progress field summarized. The UHV method leads successful unambiguous visualization different configurations. CVD protocol, contrast, achieves simpler industry‐viable fabrication GNRs, allowing scale up efficient integration as‐grown into devices. updates also addressed synthesized by both CVD, mainly transistor Furthermore, views next steps challenges on‐surface provided.

Язык: Английский

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Nanographenes and Graphene Nanoribbons as Multitalents of Present and Future Materials Science

Journal of the American Chemical Society, Год журнала: 2022, Номер 144(26), С. 11499 - 11524

Опубликована: Июнь 7, 2022

As cut-outs from a graphene sheet, nanographenes (NGs) and nanoribbons (GNRs) are ideal cases with which to connect the world of molecules that bulk carbon materials. While various top-down approaches have been developed produce such nanostructures in high yields, present perspective, precision structural control is emphasized for length, width, edge structures NGs GNRs achieved by modern solution on-surface syntheses. Their possibilities further extended "flatland" three-dimensional world, where chirality handedness jewels crown. In addition properties exhibited at molecular level, self-assembly thin-film cannot be neglected, emphasizes importance processing techniques. With rich toolkit chemistry hand, can endowed versatile functions ranging stimulated emission spintronics bioimaging energy storage, thus demonstrating their multitalents future materials science.

Язык: Английский

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Materials Science Challenges to Graphene Nanoribbon Electronics

ACS Nano, Год журнала: 2021, Номер 15(3), С. 3674 - 3708

Опубликована: Март 3, 2021

Graphene nanoribbons (GNRs) have recently emerged as promising candidates for channel materials in future nanoelectronic devices due to their exceptional electronic, thermal, and mechanical properties chemical inertness. However, the adoption of GNRs commercial technologies is currently hampered by science integration challenges pertaining synthesis devices. In this Review, we present an overview current status challenges, recent breakthroughs toward overcoming these possible directions field GNR electronics. We motivate need exploration scalable synthetic techniques that yield atomically precise, placed, registered, oriented on CMOS-compatible substrates stimulate ideas contact dielectric engineering realize experimental performance close theoretically predicted metrics. also briefly discuss unconventional device architectures could be experimentally investigated harness maximum potential spintronic quantum information technologies.

Язык: Английский

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Atomically precise graphene nanoribbons: interplay of structural and electronic properties

Chemical Society Reviews, Год журнала: 2021, Номер 50(11), С. 6541 - 6568

Опубликована: Янв. 1, 2021

On-surface synthesized atomically precise graphene nanoribbons are promising candidates for use in future devices. This article reviews nanoribbons, particular focusing on their electronic properties.

Язык: Английский

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Small Size, Big Impact: Recent Progress in Bottom‐Up Synthesized Nanographenes for Optoelectronic and Energy Applications

Advanced Science, Год журнала: 2022, Номер 9(19)

Опубликована: Фев. 26, 2022

Bottom-up synthesized graphene nanostructures, including 0D quantum dots and 1D nanoribbons, have recently emerged as promising candidates for efficient, green optoelectronic, energy storage applications. The versatility in their molecular structures offers a large novel library of nanographenes with excellent adjustable optical, electronic, catalytic properties. In this minireview, recent progress on the fundamental understanding properties different state-of-the-art applications optoelectronics are summarized. pristine nanographenes, high emissivity intriguing blinking effect dots, superior charge transport edge-specific electrochemistry various highlighted. Furthermore, it is shown that emerging nanographene-2D material-based van der Waals heterostructures provide an exciting opportunity efficient tunable characteristics. Finally, challenges opportunities field highlighted by offering guidelines future combined efforts synthesis, assembly, spectroscopic, electrical studies well (nano)fabrication to boost toward advanced device

Язык: Английский

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Recent Advances on Carbon‐Based Metal‐Free Electrocatalysts for Energy and Chemical Conversions

Advanced Materials, Год журнала: 2024, Номер unknown

Опубликована: Июль 25, 2024

Over the last decade, carbon-based metal-free electrocatalysts (C-MFECs) have become important in electrocatalysis. This field is started thanks to initial discovery that nitrogen atom doped carbon can function as a electrode alkaline fuel cells. A wide variety of nanomaterials, including 0D dots, 1D nanotubes, 2D graphene, and 3D porous carbons, has demonstrated high electrocatalytic performance across applications. These include clean energy generation storage, green chemistry, environmental remediation. The applicability C-MFECs facilitated by effective synthetic approaches, e.g., heteroatom doping, physical/chemical modification. methods enable creation catalysts with properties useful for sustainable transformation storage (e.g., cells, Zn-air batteries, Li-O

Язык: Английский

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Helical Nanographenes Embedded with Contiguous Azulene Units

Journal of the American Chemical Society, Год журнала: 2020, Номер 142(31), С. 13322 - 13327

Опубликована: Июль 17, 2020

The azulene moiety, composed of contiguous pentagonal and heptagonal rings, is a structural defect that alters the electronic, magnetic, properties graphenes graphene nanoribbons. However, nanographenes embedded with an cluster have not been widely investigated because these compounds are difficult to synthesize in their pure form. Herein, azulene-embedded bearing unique cove-type edge were synthesized by novel synthetic protocol. Experimental theoretical investigations revealed this cove imparts stable helical chirality, unlike normal edges. in-solution self-association behavior structural, electrochemical also described detail.

Язык: Английский

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Recent Advances in C–H Activation for the Synthesis of π-Extended Materials

ACS Materials Letters, Год журнала: 2020, Номер 2(8), С. 951 - 974

Опубликована: Июнь 29, 2020

The activation of typically unreactive aromatic C–H bonds by transition-metal catalysis has been receiving increased attention from the synthetic chemistry community in recent years. Advances this area have enabled direct and site-selective modification rings without need for pre-functionalization. Accordingly, these techniques found broad application many fields, including construction extended π-systems use materials science. This review will discuss reports reactions applied toward synthesis π-extended functional materials.

Язык: Английский

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Carbo[n]helicenes Restricted to Enantiomerize: An Insight into the Design Process of Configurationally Stable Functional Chiral PAHs

Chemistry - A European Journal, Год журнала: 2020, Номер 27(12), С. 3957 - 3967

Опубликована: Окт. 9, 2020

The most important stereodynamic feature of carbo[n]helicenes is the interconversion their enantiomers. Gibbs activation energy (ΔG≠ (T)) this process, which determines rate enantiomerization, dictates configurational stability [n]helicenes. High values ΔG≠ (T) are required for applications functional chiral molecules incorporating [n]helicenes or helicene substructures. This minireview provides an overview mechanism, recent developments, and factors affecting enantiomerization [n]helicenes, will accelerate design process configurationally stable based on Additionally, addresses misconception irregularities in literature how terms "racemization" "enantiomerization" used as well parameters calculated related compounds.

Язык: Английский

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Synthetic chiral molecular nanographenes: the key figure of the racemization barrier

Chemical Communications, Год журнала: 2022, Номер 58(16), С. 2634 - 2645

Опубликована: Янв. 1, 2022

Chirality is one of the most intriguing concepts chemistry, involving living systems and, more recently, materials science. In particular, bottom-up synthesis molecular nanographenes endowed with or several chiral elements a current challenge for chemical community. The wilful introduction defects in sp2 honeycomb lattice allows preparation molecules tuned band-gaps and chiroptical properties. There are two requirements that system must fulfill to be chiral: (i) lack inversion (planes centres) (ii) configurationally stable. first condition inherently established by symmetry group structure, however, limit between conformational configurational isomers not totally clear. this feature article, chirality dynamics synthetic nanographenes, special emphasis on their racemization barriers therefore, stability properties discussed. general features synthesis, including main inducing firstly regard, common topological NGs as well techniques used determining energy presented. Then, manuscript structured according classifying them four groups, depending respective isomerization barriers, flexible, detectable, isolable rigid nanographenes. these sections, different strategies increase barrier lead stable defined

Язык: Английский

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