Friedrich Krotz. Mediatisierung

Jäckel, Michael

doi:10.5771/1615-634x-2008--106

Cited by 3 publications

(4 citation statements)

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“…In case of a columnar stacking of the flat, disc-like HBC cores high charge-carrier mobilities are expected because of the large p-p overlap of adjacent nanographenes. [5,6] On SiO 2 and graphite HBC derivatives have been reported to form columns with a high degree of order and crystallinity with edge-on or face-on orientations depending on the preparation method, [7][8][9][10] like solution dipping, [11] soft-landing or zone-casting. [5,10,[12][13][14] Here, we have employed a different strategy to obtain HBC-based ultrathin films with both a high degree of ordering and a large p-p overlap.…”

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confidence: 99%

“…2d and e) and obtain quantitative information (see Supporting Information for all values). For HBC_C3 in a decanethiol matrix at 300 K a molecular resistance of R HBC ¼ 13.3 GV is found, which is lower than the molecular resistance for the purely aliphatic (insulating) dodecanethiol of 50 GV (STM) [11,28] but higher than the value of 55.5 MV for the aromatic TP1 SAM (CP-AFM, CP = conducting probe). [16] Since the HBC_C3 contains an insulating anchor chain this difference is perfectly reasonable.…”

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confidence: 99%

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Evidence for Band‐Like Transport in Graphene‐Based Organic Monolayers

et al. 2010

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Evidence for Band‐Like Transport in Graphene‐Based Organic Monolayers

et al. 2010

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“…[27] Chemical synthesis of graphene molecules has also proven to be a robust but limited method, producing welldefined structures with typical lateral sizes up to 5 nm. [9,[14][15][16][17] This leads to many unique quantum effects, but such syntheses are still limited and scaling up remains challenging. [9,28] Wet-chemistry techniques show a clear and simple trend: milder conditions are less destructive toward the graphite starting material, and therefore introduce fewer defects into the graphene products.…”

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Scalable Production of Nanographene and Doping via Nondestructive Covalent Functionalization

Guday

Donskyi

Gholami

et al. 2019

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A new method for top‐down, one‐pot, gram‐scale production of high quality nanographene by incubating graphite in a dilute sodium hypochlorite solution at only 40 °C is reported here. The produced sheets have only 4 at% oxygen content, comparable with nanographene grown by chemical vapor deposition. The nanographene sheets are covalently functionalized using a nondestructive nitrene [2+1] cycloaddition reaction that preserves their π‐conjugated system. Statistical analyses of Raman spectroscopy and X‐ray photoelectron spectroscopy indicate a low number of sp3 carbon atoms on the order of 2% before and 4% after covalent functionalization. The nanographene sheets are significantly more conductive than conventionally prepared nanographene oxide, and conductivity further increases after covalent functionalization. The observed doping effects and theoretical studies suggest sp2 hybridization for the carbon atoms involved in the [2+1] cycloaddition reaction leading to preservation of the π‐conjugated system and enhancing conductivity via n‐type doping through the bridging N‐atom. These methods are easily scalable, which opens the door to a mild and efficient process to produce high quality nanographenes and covalently functionalize them while retaining or improving their physicochemical properties.

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“…1). Denn Vanillin ist als natürlicher Aromastoff in der Vanille zu finden, kann als naturidentischer Aromastoff synthetisiert werden, und schlussendlich wird ein Derivat von Vanillin -nämlich Ethylvanillin -als künstlicher Aromastoff eingesetzt [1].…”

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Vanillezucker oder Vanillinzucker?

Sommer¹,

Andreß²,

Kakoschke³

et al. 2009

Chemkon

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Jedes Jahr werden weltweit ca. 2.000 Tonnen Vanillefrucht und ca. 12.000 Tonnen Vanillin produziert, um den Bedarf an dieser Aromanote zu decken ‐ sei es für Vanille‐Eis, Vanillin‐Zucker oder Cola. Der vorliegende Beitrag bietet sowohl fachliche Hintergrundinformationen als auch schulpraktische Möglichkeiten der experimentellen Erschließung des Themas „Vanille vs. Vanillin”︁ für die unterrichtliche Umsetzung. Es wird dabei die erfolgreiche Synthese von Vanillin aus Ligninsulfonsäure ebenso beschrieben wie Möglichkeiten der experimentellen Erschließung der Struktur von Vanillin. Anhand der Produkte „Vanillezucker”︁ und „Vanillinzucker”︁ erfolgt sowohl ein qualitativer Nachweis von Vanillin durch dünnschichtchromatographische Untersuchung als auch die quantitative Bestimmung von Vanillin im Vanillinzucker mittels Säure‐Base‐Titration.

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Friedrich Krotz. Mediatisierung

Cited by 3 publications

References 0 publications

Evidence for Band‐Like Transport in Graphene‐Based Organic Monolayers

Evidence for Band‐Like Transport in Graphene‐Based Organic Monolayers

Scalable Production of Nanographene and Doping via Nondestructive Covalent Functionalization

Vanillezucker oder Vanillinzucker?

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