X-ray Excited Optical Luminescence from Diamond Thin Films:  The Contribution of sp<sup>2</sup>- and H-Bonded Carbon to the Luminescence

Zhou, Xingtai; Sham, Tsun‐Kong; Wu, Youshen; Chong, Y.M.; Bello, I.; Lee, Shuit‐Tong; Heigl, F.; Regier, Tom; Blyth, R. I. R.

doi:10.1021/ja064555r

Cited by 15 publications

(4 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2(c) correspond to a d spacing of 3.2Å, close to the (002) spacing reported for graphite (3.3Å). 46,77,78 The slight variation in this value is due to turbostratic disorder in the carbon quantum dots. 79,80 The fast Fourier transform (FFT) of the N-CQDs ( Fig.…”

Section: Resultsmentioning

confidence: 99%

“…The XRD pattern of the N-CQDs deposited on glass is shown in Fig. ESI 5 † which shows a diffraction peak centred at 2q ¼ 31.7 in agreement with the (002) plane of graphite. 78 The peak at 40 is ascribed to the (012) reection of rhombohedral graphite which normally coexists with the more common hexagonal phase. The peak at around 78 is attributed to the (110) reection of graphite.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Environmentally friendly nitrogen-doped carbon quantum dots for next generation solar cells

Carolan

Rocks

Padmanaban

et al. 2017

Sustainable Energy Fuels

View full text Add to dashboard Cite

Shine on you crazy carbon! In this work, nitrogen-doped carbon quantum dots (N-CQDs) are synthesized using a simple custom atmospheric pressure microplasma. The method is facile, rapid, and environmentally friendly and the N-CQDs can be produced in a few minutes with no need for high temperature, complicated chemical techniques, or surface ligands. The N-CQDs are formed using molecular precursors and can be produced in different solvent mixtures. Material characterization techniques show a high degree of nitrogen doping on the QD surface with the amount of nitrogen depending on initial reaction conditions. The N-CQDs show interesting quantum confined optical properties that depend on the amount of nitrogen incorporation. Importantly, the band energy structure of the N-CQDs is elucidated and they are incorporated into a photovoltaic device as the photoactive layer achieving an extraordinary open-circuit voltage of 1.8 V and a power conversion efficiency of 0.8% (champion device), amongst the highest reported to date for group IV and carbon based quantum dots.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Environmentally friendly nitrogen-doped carbon quantum dots for next generation solar cells

Carolan

Rocks

Padmanaban

et al. 2017

Sustainable Energy Fuels

View full text Add to dashboard Cite

show abstract

“…Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy is an effective technique for obtaining data on electronic structure, symmetry and energy distribution of unoccupied electron states in carbon-containing substances as well as on the coordination and the chemical state of carbon atoms . Previously, C 1s NEXAFS spectra were measured in particular to characterize the growth processes of diamond nanocrystalline films ,− and the different purification treatments of detonation NDs, in order to estimate the fraction of graphitized carbon shells of diamond nanoparticles, − to study quantum confinement effects in NDs , and to study the σ exciton in the C 1s absorption spectra of nanodiamonds. , However, no NEXAFS studies of F-NDs are reported so far to the best of our knowledge. On the other hand, these studies are necessary to get deeper insight into the character of the chemical interaction between the surface carbon and fluorine atoms and the electronic structure of fluorinated diamond nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Comparative NEXAFS, NMR, and FTIR Study of Various-Sized Nanodiamonds: As-Prepared and Fluorinated

et al. 2014

View full text Add to dashboard Cite

Various 4−50 nm in size diamond nanoparticles prepared by different synthesis methods and their fluorinated derivatives were studied by NEXAFS, solid state NMR and FTIR spectroscopy. C 1s and F 1s NEXAFS spectra of as-prepared and fluorinated nanodiamonds (NDs and F-NDs) were analyzed based on a comparison with the known ones of reference compounds (graphitized carbon nanodiscs, phenol and amino acid molecules, graphite oxide and monofluoride). It has been found that all the studied diamond nanoparticles have crystalline diamond cores and their surfaces are covered with graphite-like carbon clusters. These clusters are partially amorphized and oxidized with the formation of functional groups C−OH, CO, or OC−OH and the properties of these surface shells depend on the synthesis method of nanodiamonds. The fluorination of diamond nanoparticles has a purely superficial character; it almost completely cleans the NDs particles from carbon clusters and saturates dangling bonds on the surface of the diamond nanoparticles with F atoms forming covalent σ(C−F) bonds. NEXAFS data are further supported by NMR and FTIR spectroscopy, leading to similar conclusions concerning the properties of various NDs and the chemical bonding between C and F atoms in F-NDs. A combination of NEXAFS, solid state NMR and FTIR spectroscopy is demonstrated to be very efficient in investigating various NDs and their functionalized derivatives.

show abstract

“…This is in agreement with the fact that the luminescence of CVD diamond films is not associated with the phase impurities of 𝑠𝑝 2 -or the H-bonded non-diamond carbon, but originates from the diamond phase. [24] Table 1 also lists the n-type conductivity values of the samples measured by a Hall effects instrument. It is worth noting that the resistivity values of the unimplanted sample, the as-implanted sample, and samples O14500 and O14650 are very high, which could 088102-2 not be measured by Hall effect instruments, [15] so that there are no data for those samples listed in Table 1.…”

mentioning

confidence: 99%

Oxygen Ion Implantation Enhanced Silicon-Vacancy Photoluminescence and n-Type Conductivity of Ultrananocrystalline Diamond Films

Hu¹,

Li²

2013

Chinese Phys. Lett.

View full text Add to dashboard Cite

We report the enhanced silicon-vacancy (Si-V) photoluminescence (PL) intensity and n-type conductivity of ultrananocrystalline diamond (UNCD) films by oxygen ion (O + ) implantation. With O + dose increasing from 10 14 to 10 15 cm −2 , the PL intensity and n-type conductivity significantly increase by 6 and 45 times, respectively, after 1000 ∘ C annealing. The secondary ion mass spectroscopy mapping measurements show that the content of oxygen is larger in the zone, which has larger content of silicon, indicating that oxygen tends to adhere to silicon. It is suggested that oxygen related Si-V defects are formed, which will enhance the PL intensity and n-type conductivity of UNCD films.

show abstract

X-ray Excited Optical Luminescence from Diamond Thin Films: The Contribution of sp²- and H-Bonded Carbon to the Luminescence

Cited by 15 publications

References 27 publications

Environmentally friendly nitrogen-doped carbon quantum dots for next generation solar cells

Environmentally friendly nitrogen-doped carbon quantum dots for next generation solar cells

Comparative NEXAFS, NMR, and FTIR Study of Various-Sized Nanodiamonds: As-Prepared and Fluorinated

Oxygen Ion Implantation Enhanced Silicon-Vacancy Photoluminescence and n-Type Conductivity of Ultrananocrystalline Diamond Films

Contact Info

Product

Resources

About

X-ray Excited Optical Luminescence from Diamond Thin Films: The Contribution of sp2- and H-Bonded Carbon to the Luminescence

Cited by 15 publications

References 27 publications

Environmentally friendly nitrogen-doped carbon quantum dots for next generation solar cells

Environmentally friendly nitrogen-doped carbon quantum dots for next generation solar cells

Comparative NEXAFS, NMR, and FTIR Study of Various-Sized Nanodiamonds: As-Prepared and Fluorinated

Oxygen Ion Implantation Enhanced Silicon-Vacancy Photoluminescence and n-Type Conductivity of Ultrananocrystalline Diamond Films

Contact Info

Product

Resources

About

X-ray Excited Optical Luminescence from Diamond Thin Films: The Contribution of sp²- and H-Bonded Carbon to the Luminescence