Raman spectra of nitrogen-doped tetrahedral amorphous carbon from first principles

Niu, Li; Zhu, Jiaqi; Gao, Wei; Xiao, Han; Du, Shiyu

doi:10.1007/s11434-009-0454-2

Cited by 3 publications

(1 citation statement)

References 28 publications

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“…Unfortunately, elucidating definitive spectral evidence for this hypothesis is difficult given the small amount likely to be present. Moreover, significant spectral overlap between CC and CN stretching modes of these two amorphous materials is likely, making them spectrally indistinguishable, , although positive spectral identification of nitrogen-doped amorphous carbon might be possible through UV excitation in which the sp 1 bonds would be resonantly enhanced …”

Section: Resultsmentioning

confidence: 99%

Reaction Chemistry of Solid-State Pyridine Thin Films with Vapor Deposited Ag, Mg, and Al

Matz

Pemberton

2012

J. Phys. Chem. C

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The reaction of pyridine in thin solid-state films with postdeposited Ag, Mg, and Al is investigated using surface Raman spectroscopy in ultrahigh vacuum. Vapor-deposited Ag forms metallic nanoparticles on the pyridine film, resulting in surface enhancement of the Raman scattering (SERS), with no reaction chemistry evident. Mg and Al react with pyridine by electron transfer to form radical anion intermediates, some of which are stabilized by entrapment in the solid pyridine matrix. With Mg, slight SERS enhancement is observed along with Mg-to-pyridine electron transfer to form pyridyl radical anions, some of which dimerize to 4,4′-bipyridine with loss of MgH 2 and a neutral Mg atom. With Al, the reaction chemistry is initiated by a similar Al-to-pyridine electron transfer, but the radical anions so formed undergo further degradation to amorphous carbon. In total, these results demonstrate the complex reaction chemistry that can occur between heterocycles in the solid state and low work function metal atoms.

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Section: Resultsmentioning

confidence: 99%