Synthesis of pristine graphene-like behaving rGO thin film: Insights into what really matters

Sedki, Mohammed; Mirabedini, Pegah S.; Nakama, Kenta; Stephens, Garrett; Groves, Michael N.; Lee, Ilkeun; Neupane, Mahesh R.; Mulchandani, Ashok

doi:10.1016/j.carbon.2021.10.011

Cited by 18 publications

(10 citation statements)

References 87 publications

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“…The C 1s spectra of GO presented two main peaks: 284.3 eV corresponding to CC and C–C, attributed to the GO sp 2 carbon network, and 286.4 eV corresponding to C–O, attributed to the epoxide groups and C–OH bonds . The peaks at 287.8 and 288.9 eV can also be seen, which correspond to CO (carbonyl) and COOH (carboxyl group), respectively . In the O 1s spectra of GO, the oxygenated groups are also confirmed by peaks at 531.1, 532.1, and 533.1 eV.…”

Section: Resultsmentioning

confidence: 85%

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Neighboring Effects on the Selective Bifunctionalization of Graphene Oxide for Nanocatalytic Organophosphate Neutralization

Santos

Martinez

Veiga

et al. 2022

ACS Appl. Nano Mater.

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The bifunctionalization of graphene oxide (GO) has attracted attention as a promising tool for broadening applications, despite its many challenges, especially regarding site-specific reactions. Herein, we obtained mono-and bifunctionalized GO containing thiol and imidazole groups that were anchored on the carboxylic acid sites of GO via amidation reactions. We varied the bifunctionalization methodology and showed that consecutive addition of the reagents (containing imidazole and thiol groups) led to materials with higher degrees of functionalization, in contrast to their simultaneous addition. The functionalized materials were evaluated as nanocatalysts in the neutralization reaction of a toxic organophosphate. Also, it was evidenced that the effect of the mono-and bifunctionalized materials on the catalytic outcomes gives insight toward neighboring effects. All catalysts were effective in the reaction studied with the monofunctionalized materials (containing thiol or imidazole groups) showing similar activity. Among the bifunctionalized materials (with both thiol and imidazole moieties), the one with the lower degree of functionalization showed the best performance. This was attributed to a combination of mechanisms, strongly dependent on the neighboring groups: attraction on the GO surface, nucleophilic catalysis by thiol/imidazole groups, and bifunctional intramolecular catalysis, for example, by thiol and imidazole groups, assisting potential nucleophilic hydroxyl groups. Oddly, the bifunctionalized materials with the higher degree of functionalization did not show the most prominent activity; they were actually similar to the monofunctionalized ones. This can be attributed to the inhibition or hindering of some of the proposed mechanisms due to steric effects or a nonideal positioning of the groups. A lot remains to be clarified in this field, but one thing is clear: a higher degree of functionalization should not always be pursued because the application of the material is what should guide what characteristics should be determined. Several other applications should be impacted by neighboring effects, which are directly influenced by the functionalization procedure.

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Section: Resultsmentioning

confidence: 85%

“…37 The peaks at 287.8 and 288.9 eV can also be seen, which correspond to CO (carbonyl) and COOH (carboxyl group), respectively. 38 In the O 1s spectra of GO, the oxygenated groups are also confirmed by peaks at 531.1, 532.1, and 533.1 eV. Some of these bonds to which these peaks correspond are CO, C−OH, and C−O−C.…”

Section: Resultsmentioning

confidence: 90%

Neighboring Effects on the Selective Bifunctionalization of Graphene Oxide for Nanocatalytic Organophosphate Neutralization

Santos

Martinez

Veiga

et al. 2022

ACS Appl. Nano Mater.

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“…Organic field-effect transistors are the fundamental building blocks of many organic electronics. − Recently, vertical organic field-effect transistors (VOFETs) based on graphene electrode have attracted considerable interest, as they utilize unique gate-tunable work function characteristics of graphene to modulate the injection barrier at the heterojunction. − However, almost all these devices utilized chemical vapor deposition (CVD) prepared graphene, and the rather complicated transfer process of the CVD graphene to the substrate severely limits its large-scale applications. By contrast, reduced graphene oxide (rGO) possesses a similar structure and properties to graphene. − Importantly, it can be massively produced by reduction of solution-processable graphene oxide (GO). Therefore, using rGO to replace the CVD-graphene electrode in VOFETs shows great promise for future large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

C₆₀-Modified Reduced-Graphene-Oxide-Based p-Type Vertical Organic Field-Effect Transistors for Future Complementary Circuits

Qiao

2023

ACS Appl. Nano Mater.

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The fabrication of p-type vertical organic field-effect transistors (VOFETs) based on a reduced graphene oxide (rGO) electrode is a big challenge. Due to the insufficient injection barrier at the rGO/p-type organic semiconductor heterojunction, the current on/off ratio of the device is usually poor. To improve device performance and enable its application in future organic complementary circuits with their n-type counterparts, different types of interfacial layers were explored in this study. Results suggest that the highest occupied molecular orbital level and the surface morphology of the interfacial layer play an important role in device performance, while the hole mobility of the interfacial layer has less impact. In addition, the effect of the interfacial layer thickness was systematically investigated, indicating that an ultrathin interfacial layer was preferred in terms of the on-current density. Notably, the device with a 1 nm thick C 60 interfacial layer gave the best device performance, exhibiting the highest current on/off ratio exceeding 5 × 10 3 and a maximum current density over 30 mA/cm 2 under an operation voltage of −3 V. This is the first p-type VOFETs based on the work-function-tunable rGO electrode, which may open the door to rGO-based organic complementary circuits.

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“…Reduced graphene oxide (rGO) has a similar structure and properties to graphene. 26 − 28 Importantly, it can be easily mass-produced by the reduction of low-cost graphene oxide (GO). 29 , 30 Furthermore, the solution-processable rGO electrode is compatible with some industrial processing techniques such as printing and laser-direct writing.…”

Section: Introductionmentioning

confidence: 99%

“…Reduced graphene oxide (rGO) has a similar structure and properties to graphene. − Importantly, it can be easily mass-produced by the reduction of low-cost graphene oxide (GO). , Furthermore, the solution-processable rGO electrode is compatible with some industrial processing techniques such as printing and laser-direct writing. − Hence, the use of rGO to replace the CVD-grown graphene in VOFETs is highly desirable, which benefits the large-scale application in future organic electronics. The first paper on the use of rGO as work-function-tunable electrode in VOFETs has been recently reported .…”

Section: Introductionmentioning

confidence: 99%

Performance Improvement with an Ultrathin p-Type Interfacial Layer in n-Type Vertical Organic Field-Effect Transistors Based on Reduced Graphene Oxide Electrode

et al. 2022

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Synthesis of pristine graphene-like behaving rGO thin film: Insights into what really matters

Cited by 18 publications

References 87 publications

Neighboring Effects on the Selective Bifunctionalization of Graphene Oxide for Nanocatalytic Organophosphate Neutralization

Neighboring Effects on the Selective Bifunctionalization of Graphene Oxide for Nanocatalytic Organophosphate Neutralization

C₆₀-Modified Reduced-Graphene-Oxide-Based p-Type Vertical Organic Field-Effect Transistors for Future Complementary Circuits

Performance Improvement with an Ultrathin p-Type Interfacial Layer in n-Type Vertical Organic Field-Effect Transistors Based on Reduced Graphene Oxide Electrode

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Synthesis of pristine graphene-like behaving rGO thin film: Insights into what really matters

Cited by 18 publications

References 87 publications

Neighboring Effects on the Selective Bifunctionalization of Graphene Oxide for Nanocatalytic Organophosphate Neutralization

Neighboring Effects on the Selective Bifunctionalization of Graphene Oxide for Nanocatalytic Organophosphate Neutralization

C60-Modified Reduced-Graphene-Oxide-Based p-Type Vertical Organic Field-Effect Transistors for Future Complementary Circuits

Performance Improvement with an Ultrathin p-Type Interfacial Layer in n-Type Vertical Organic Field-Effect Transistors Based on Reduced Graphene Oxide Electrode

Contact Info

Product

Resources

About

C₆₀-Modified Reduced-Graphene-Oxide-Based p-Type Vertical Organic Field-Effect Transistors for Future Complementary Circuits