Observation of a C-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi>s</mml:mi></mml:math>Core Exciton in Diamond

Morar, J. F.; Himpsel, F. J.; Hollinger, G.; Hughes, G.; Jordan, J. L.

doi:10.1103/physrevlett.54.1960

Cited by 232 publications

(122 citation statements)

References 32 publications

Supporting

Mentioning

103

Contrasting

Order By: Relevance

“…Since the first observation of the C1s‐core exciton of diamond,66 much theoretical as well as experimental work has been devoted to the understanding the electron–hole interactions of carbon materials, particularly to unravel whether they should be considered as Wannier‐ or Frenkel‐type excitons. The answer to this question is not trivial since different types of excitons may also exist in the same material.…”

Section: Origin Of Photoactivity Of Nanoporous Carbonsmentioning

confidence: 99%

Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Bandosz

Ania

2018

Advanced Science

View full text Add to dashboard Cite

Even though, owing to the complexity of nanoporous carbons' structure and chemistry, the origin of their photoactivity is not yet fully understood, the recent works addressed here clearly show the ability of these materials to absorb light and convert the photogenerated charge carriers into chemical reactions. In many aspects, nanoporous carbons are similar to graphene; their pores are built of distorted graphene layers and defects that arise from their amorphicity and reactivity. As in graphene, the photoactivity of nanoporous carbons is linked to their semiconducting, optical, and electronic properties, defined by the composition and structural defects in the distorted graphene layers that facilitate the exciton splitting and charge separation, minimizing surface recombination. The tight confinement in the nanopores is critical to avoid surface charge recombination and to obtain high photochemical quantum yields. The results obtained so far, although the field is still in its infancy, leave no doubts on the possibilities of applying photochemistry in the confined space of carbon pores in various strategic disciplines such as degradation of pollutants, solar water splitting, or CO2 mitigation. Perhaps the future of photovoltaics and smart‐self‐cleaning or photocorrosion coatings is in exploring the use of nanoporous carbons.

show abstract

Section: Origin Of Photoactivity Of Nanoporous Carbonsmentioning

confidence: 99%

Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Bandosz

Ania

2018

Advanced Science

View full text Add to dashboard Cite

show abstract

“…When recorded as a function of the photon excitation energy, exciting from the C͑1s͒ core level, it has been shown to be a powerful probe of the diamond electronic structure. [43][44][45][46] Unlike Raman spectroscopy, NEXAFS has a similar cross section for different carbon allotropes and it is sensitive to local chemical bonding, which enables analysis of nanosized carbon materials. 47,48 …”

Section: Introductionmentioning

confidence: 99%

Bulk and surface thermal stability of ultra nanocrystalline diamond films with 10–30 nm grain size prepared by chemical vapor deposition

Michaelson

Stacey

Orwa

et al. 2010

Journal of Applied Physics

View full text Add to dashboard Cite

The thermal stability of nanocrystalline diamond films with 10–30 nm grain size deposited by microwave enhanced chemical vapor deposition on silicon substrate was investigated as a function of annealing temperature up to 1200 °C. The thermal stability of the surface-upper atomic layers was studied with near edge x-ray absorption fine structure (NEXAFS) spectroscopy recorded in the partial electron yield mode. This technique indicated substantial thermally induced graphitization of the film within a close proximity to the surface. While in the bulk region of the film no graphitization was observed with either Raman spectroscopy or NEXAFS spectroscopy recorded in total electron yield mode, even after annealing to 1200 °C. Raman spectroscopy did detect the complete disappearance of transpolyacetylene (t-PA)-like ν1 and ν3 modes following annealing at 1000 °C. Secondary ion mass spectroscopy, applied to investigate this relative decrease in hydrogen atom concentration detected only a ∼30% decrease in the bulk content of hydrogen atoms. This enhanced stability of sp3 hybridized atoms within the bulk region with respect to graphitization is discussed in terms of carbon bond rearrangement due to the thermal decomposition of t-PA-like fragments.

show abstract

“…29 The peak at ∼289.5 eV corresponds to the diamond core exciton, which is the result of the bound electron-hole pair. 30 The dip at ∼302.5 eV, is attributed to the second absolute band gap. 31 Both are characteristics of NEXAFS spectrum corresponding to the diamond of Fd3m structure.…”

Section: A the Overall Au-ion Irradiation Effectmentioning

confidence: 99%

The potential application of ultra-nanocrystalline diamond films for heavy ion irradiation detection

Chen

Wang

et al. 2013

AIP Advances

View full text Add to dashboard Cite

The potential of utilizing the ultra-nanocrystalline (UNCD) films for detecting the Au-ion irradiation was investigated. When the fluence for Au-ion irradiation is lower than the critical value (fc = 5.0 × 1012 ions/cm2) the turn-on field for electron field emission (EFE) process of the UNCD films decreased systematically with the increase in fluence that is correlated with the increase in sp2-bonded phase (π*-band in EELS) due to the Au-ion irradiation. The EFE properties changed irregularly, when the fluence for Au-ion irradiation exceeds this critical value. The transmission electron microscopic microstructural examinations, in conjunction with EELS spectroscopic studies, reveal that the structural change preferentially occurred in the diamond-to-Si interface for the samples experienced over critical fluence of Au-ion irradiation, viz. the crystalline SiC phase was induced in the interfacial region and the thickness of the interface decreased. These observations implied that the UNCD films could be used as irradiation detectors when the fluence for Au-ion irradiation does not exceed such a critical value

show abstract

Observation of a C-1sCore Exciton in Diamond

Cited by 232 publications

References 32 publications

Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Origin and Perspectives of the Photochemical Activity of Nanoporous Carbons

Bulk and surface thermal stability of ultra nanocrystalline diamond films with 10–30 nm grain size prepared by chemical vapor deposition

The potential application of ultra-nanocrystalline diamond films for heavy ion irradiation detection

Contact Info

Product

Resources

About