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Imaging covalent bond formation by H atom scattering from graphene

Viewing the atomic-scale motion and energy dissipation pathways involved in forming a covalent bond is a longstanding challenge for chemistry. We performed scattering experiments of H atoms from graphene and observed a bimodal translational energy loss distribution. Using accurate first-principles dynamics simulations, we show that the quasi-elastic channel involves scattering through the physisorption well where collision sites are near the centers of the six-membered C-rings. The second channel results from transient C–H bond formation, where H atoms lose 1 to 2 electron volts of energy within a 10-femtosecond interaction time. This remarkably rapid form of intramolecular vibrational relaxation results from the C atom’s rehybridization during bond formation and is responsible for an unexpectedly high sticking probability of H on graphene.

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Stabilizing a C-H bond on graphene with sound

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[ASAP] Length-Dependent Evolution of Type II Heterojunctions in Bottom-Up-Synthesized Graphene Nanoribbons

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Nano Letters
DOI: 10.1021/acs.nanolett.9b00758

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[ASAP] Dual-Sensitive Graphene Oxide Loaded with Proapoptotic Peptides and Anticancer Drugs for Cancer Synergetic Therapy

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Langmuir
DOI: 10.1021/acs.langmuir.9b00611

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Graphene nanomaterial to replace mercury in LEDs

Researchers succeeded in creating light-emitting diodes, or LEDs, from a graphene nanomaterial that emits ultraviolet light.

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Graphene quantum dots could yield treatment for traumatic injuries

Graphene quantum dots drawn from common coal may be the basis for an effective antioxidant for people who suffer traumatic brain injuries, strokes or heart attacks.

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Modified ‘white graphene’ for eco-friendly energy

Scientists found a way how to use 2D material for hydrogen energy.

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[ASAP] Graphene Oxide Flakes Tune Excitatory Neurotransmission in Vivo by Targeting Hippocampal Synapses

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Nano Letters
DOI: 10.1021/acs.nanolett.8b04903

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Graphene foam material harvests water from air

A newly developed graphene nanocomposite foam realizes water harvesting through a capture-release cycle.

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[ASAP] Strategy for Highly Sensitive Electrochemical Sensing: In Situ Coupling of a Metal–Organic Framework with Ball-Mill-Exfoliated Graphene

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Analytical Chemistry
DOI: 10.1021/acs.analchem.9b00556

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