Solution-Synthesized Extended Graphene Nanoribbons Deposited by High-Vacuum Electrospray Deposition

Scherb, Sebastian; Hinaut, Antoine; Yao, Xuelin; Götz, Alicia; Al-Hilfi, Samir H.; Hu, Yunbin; Qiu, Zijie; Song, Yiming; Müllen, Kläus; Glatzel, Thilo; Narita, Akimitsu; Meyer, Ernst

doi:10.1021/acsnano.2c09748

“…High-vacuum electrospray deposition [27] of 8-AGNR in chlorobenzene on Au(111) enabled us to image its molecular structure by scanning probe microscopy. Assembled structures, presumably consisting of a few 8-AGNR, were visualized both by STM at 4.8 K (Figure 2e) and non-contact atomic force microscopy (nc-AFM) at room temperature (Figure S16a).…”

Section: Methodsmentioning

confidence: 99%

N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

Yao,

Zhang,

Kong

et al. 2023

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Structurally defined graphene nanoribbons (GNRs) have emerged as promising candidates for nanoelectronic devices. Low bandgap (< 1 eV) GNRs are particularly important when considering the Schottky barrier in device performance. Here, we demonstrate the first solution synthesis of 8‐AGNRs through a carefully designed arylated polynaphthalene precursor. The efficiency of the oxidative cyclodehydrogenation of the tailor‐made polymer precursor into 8‐AGNRs was validated by FT‐IR, Raman, and UV‐vis‐near‐infrared (NIR) absorption spectroscopy, and further supported by the synthesis of naphtho[1,2,3,4‐ghi]perylene derivatives (1 and 2) as subunits of 8‐AGNR, with a width of 0.86 nm as suggested by the X‐ray single crystal analysis. Low‐temperature scanning tunneling microscopy (STM) and solid‐state NMR analyses provided further structural support for 8‐AGNR. The resulting 8‐AGNR exhibited a remarkable NIR absorption extending up to ∼2400 nm, corresponding to an optical bandgap as low as ∼0.52 eV. Moreover, optical‐pump TeraHertz‐probe spectroscopy revealed charge‐carrier mobility in the dc limit of ∼270 cm2 V–1 s–1 for the 8‐AGNR.

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N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

Yao,

Zhang,

Kong

et al. 2023

Angewandte Chemie

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Structurally defined graphene nanoribbons (GNRs) have emerged as promising candidates for nanoelectronic devices. Low bandgap (< 1 eV) GNRs are particularly important when considering the Schottky barrier in device performance. Here, we demonstrate the first solution synthesis of 8‐AGNRs through a carefully designed arylated polynaphthalene precursor. The efficiency of the oxidative cyclodehydrogenation of the tailor‐made polymer precursor into 8‐AGNRs was validated by FT‐IR, Raman, and UV‐vis‐near‐infrared (NIR) absorption spectroscopy, and further supported by the synthesis of naphtho[1,2,3,4‐ghi]perylene derivatives (1 and 2) as subunits of 8‐AGNR, with a width of 0.86 nm as suggested by the X‐ray single crystal analysis. Low‐temperature scanning tunneling microscopy (STM) and solid‐state NMR analyses provided further structural support for 8‐AGNR. The resulting 8‐AGNR exhibited a remarkable NIR absorption extending up to ∼2400 nm, corresponding to an optical bandgap as low as ∼0.52 eV. Moreover, optical‐pump TeraHertz‐probe spectroscopy revealed charge‐carrier mobility in the dc limit of ∼270 cm2 V–1 s–1 for the 8‐AGNR.

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The Role of Alkyl Chains in the Thermoresponse of Supramolecular Network

Scherb,

Hinaut,

Gu

et al. 2024

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Supramolecular materials provide a pathway for achieving precise, highly ordered structures while exhibiting remarkable response to external stimuli, a characteristic not commonly found in covalently bonded materials. The design of self‐assembled materials, where properties could be predicted/design from chemical nature of the individual building blocks, hinges upon our ability to relate macroscopic properties to individual building blocks – a feat which has thus far remained elusive. Here, a design approach is demonstrated to chemically engineer the thermal expansion coefficient of 2D supramolecular networks by over an order of magnitude (\boldmath 120 to \boldmath 1000 × 10−6 K−1). This systematic study provides a clear pathway on how to carefully design the thermal expansion coefficient of a 2D molecular assembly. Specifically, a linear relation has been identified between the length of decorating alkyl chains and the thermal expansion coefficient. Counter‐intuitively, the shorter the chains the larger is the thermal expansion coefficient. This precise control over thermo‐mechanical properties marks a significant leap forward in the de‐novo design of advanced 2D materials. The possibility to chemically engineer their thermo‐mechanical properties holds promise for innovations in sensors, actuators, and responsive materials across diverse fields.

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Solution-Synthesized Extended Graphene Nanoribbons Deposited by High-Vacuum Electrospray Deposition

Cited by 5 publications

References 59 publications

N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

N=8 Armchair Graphene Nanoribbons: Solution Synthesis and High Charge Carrier Mobility**

The Role of Alkyl Chains in the Thermoresponse of Supramolecular Network

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