When 2D Materials Meet Molecules: Opportunities and Challenges of Hybrid Organic/Inorganic van der Waals Heterostructures

Gobbi, Marco; Orgiu, Emanuele; Samorı́, Paolo

doi:10.1002/adma.201706103

Cited by 221 publications

(216 citation statements)

References 174 publications

(350 reference statements)

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“…Thus, much efforth as been invested to the development of facile, reliable, and low-cost synthetic routest owardst he preparation of highly dispersible and processable graphene derivatives. [27,31] On the other hand, covalent functionalization of graphene yields more stable and robust systems. [28,29] Graphenec an be functionalized at the covalento r noncovalent level.…”

Section: Introductionmentioning

confidence: 99%

Modular Preparation of Graphene‐Based Functional Architectures through Two‐Step Organic Reactions: Towards High‐Performance Energy Storage

Zhang

Hou

Richard

et al. 2018

Chemistry A European J

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Graphene-based materials have recently attracted much attention due to their extraordinary physical and chemical properties, which make them attractive candidates for many technological applications in sensing, optoelectronics, catalysis, and energy storage. Their chemical functionalization is key to tuning their properties. Herein, a novel two-step synthetic approach, which enables a high degree of covalent functionalization of graphene oxide (GO) is devised, thereby making the facile attachment of various robust functional molecules possible. Such a process relies initially on the grafting of an ethylenediamine linker followed by a second step consisting of the condensation reaction between aldehyde and amine groups to form imine bonds. As test beds, two kinds of graphene-based functional systems, namely, porphyrin-modified GO and ferrocene-modified GO, are prepared. Such hybrid systems are characterized by various spectroscopic and microscopic techniques. The degree of functionalization is quantified as the attachment of one porphyrin or ferrocene unit to every 34 or 77 carbon atoms of the GO scaffold, respectively, which is much higher than that of values obtained upon using various established chemical approaches to functionalize GO, such as condensation, cycloaddition, or coupling reactions. For the first time, the reduced form of ferrocene-modified GO was employed as an electrode material in supercapacitors, showing a specific capacitance of 127 F g at a current density of 1 A g , with capacitance retention of about 93 % after 5000 cycles at the same current density; this demonstrates great potential for application in high-performance energy-storage devices.

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Section: Introductionmentioning

confidence: 99%

Modular Preparation of Graphene‐Based Functional Architectures through Two‐Step Organic Reactions: Towards High‐Performance Energy Storage

Zhang

Hou

Richard

et al. 2018

Chemistry A European J

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“…When a considerable number of solvent molecules with non‐negligible dipoles are physisorbed onto the surface of BP, a local electric field emerges from the dipole, acting as a local gate to BP. The work function of BP is thus modulated by the molecular gating effect, thus inducing doping . Since the physisorption of these solvent molecules do not necessarily form self‐assembled monolayers on BP surface, the dipole orientation on the devices with channel length of a few micrometers is likely disordered.…”

Section: Resultsmentioning

confidence: 99%

Tuning the Optical and Electrical Properties of Few‐Layer Black Phosphorus via Physisorption of Small Solvent Molecules

Wang

Slassi

Cornil

et al. 2019

Small

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Black phosphorus (BP) is recently becoming more and more popular among semiconducting 2D materials for (opto)electronic applications. The controlled physisorption of molecules on the BP surface is a viable approach to modulate its optical and electronic properties. Solvents consisting of small molecules are often used for washing 2D materials or as liquid media for their chemical functionalization with larger molecules, disregarding their ability to change the opto‐electronic properties of BP. Herein, it is shown that the opto‐electronic properties of mechanically exfoliated few‐layer BP are altered when physically interacting with common solvents. Significantly, charge transport analysis in field‐effect transistors reveals that physisorbed solvent molecules induce a modulation of the charge carrier density which can be as high as 1012 cm−2 in BP, i.e., comparable to common dopants such as F4‐TCNQ and MoO3. By combining experimental evidences with density functional theory calculations, it is confirmed that BP doping by solvent molecules not only depends on charge transfer, but is also influenced by molecular dipole. The results clearly demonstrate how an exquisite tuning of the opto‐electronic properties of few‐layer BP can be achieved through physisorption of small solvent molecules. Such findings are of interest both for fundamental studies and more technological applications in opto‐electronics.

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Section: Vertical Organic Light-emitting Transistors (Volets)mentioning

confidence: 99%

Vertical Organic Field‐Effect Transistors

Liu

Qin

Gao

et al. 2019

Adv Funct Materials

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Field-effect transistors are the fundamental building blocks for electronic circuits and processors. Compared with inorganic transistors, organic field-effect transistors (OFETs), featuring low cost, low weight, and easy fabrication, are attractive for large-area flexible electronic devices. At present, OFETs with planar structures are widely investigated device structures in organic electronics and optoelectronics; however, they face enormous challenges in realizing large current density, fast operation speed, and outstanding mechanical flexibility for advancing their potential commercialized applications. In this context, vertical organic field-effect transistors (VOFETs), composed of vertically stacked source/drain electrodes, could provide an effective approach for solving these questions due to their inherent small channel length and unique working principles. Since the first report of VOFETs in 2004, impressive progress has been witnessed in this field with the improvement of device performance. The aim of this review is to give a systematical summary of VOFETs with a special focus on device structure optimization for improved performance and potential applications demonstrated by VOFETs. An overview of the development of VOFETs along with current challenges and perspectives is also discussed. It is hoped that this review is timely and valuable for the next step in the rapid development of VOFETs and their related research fields.

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When 2D Materials Meet Molecules: Opportunities and Challenges of Hybrid Organic/Inorganic van der Waals Heterostructures

Cited by 221 publications

References 174 publications

Modular Preparation of Graphene‐Based Functional Architectures through Two‐Step Organic Reactions: Towards High‐Performance Energy Storage

Modular Preparation of Graphene‐Based Functional Architectures through Two‐Step Organic Reactions: Towards High‐Performance Energy Storage

Tuning the Optical and Electrical Properties of Few‐Layer Black Phosphorus via Physisorption of Small Solvent Molecules

Vertical Organic Field‐Effect Transistors

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