Hydrogen plasma treated nanodiamonds lead to an overproduction of hydroxyl radicals and solvated electrons in solution under ionizing radiation

Brun, Émilie; Girard, Hugues A.; Arnault, Jean-Charles; Mermoux, Michel; Sicard-Roselli, Cécile

doi:10.1016/j.carbon.2020.02.063

Cited by 29 publications

(36 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We assume that the high energy radiation (>100 eV) leads to radiolysis of water forming different radical species close to the DB surface [47] . The radical species may also be a result of the emission of secondary electrons from the H‐terminated DB, as previously reported for hydrogenated nanodiamonds [48,49] . As shown in the electrochemical characterization, the H‐terminated DB surface is readily oxidized in the presence of reactive species.…”

Section: Resultsmentioning

confidence: 70%

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO₂ Reduction in Room Temperature Ionic Liquids

et al. 2020

View full text Add to dashboard Cite

Conductive, boron doped diamond (BDD) is an extraordinary material with many applications in electrochemistry due to its wide potential window, outstanding robustness, low capacitance and resistance to fouling. However, in photoelectrochemistry, BDD usually requires UV light for excitation, which impedes e. g., usage in CO2 to fuel reduction. In this work, a heavily boron doped, nanostructured diamond electrode with enhanced light absorption has been developed. It is manufactured from BDD by reactive ion etching and presents a coral‐like structure with pore diameters in the nanometer range, ensuring a huge surface area. The strong light absorbance of this material is clearly visible from its black color. Consequently, the material is called Diamond Black (DB). Electrochemical and X‐ray photoelectron spectroscopy measurements performed at near‐ambient pressure conditions of water vapor demonstrate increased surface reactivity for the hydrogen‐terminated DB compared to oxidized surfaces. Depending on the surface termination, the wettability and hence the electrochemically accessible area can be changed. Photoelectrochemical conversion of CO2 was demonstrated using a Cu2O‐modified electrode in ionic liquids under solar illumination. High formic acid production rates at low catalyst deposition times can be obtained paired with an increased catalyst stability on the DB surface.

show abstract

Section: Resultsmentioning

confidence: 70%

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO₂ Reduction in Room Temperature Ionic Liquids

et al. 2020

View full text Add to dashboard Cite

show abstract

“…7-OH-Coum is proportional to HO • concentration and specific for HO • among other reactive oxygen species 52 . In the conditions used, coumarin reacts with HO • ~10 −7 s after the initial transfer of energy to water (rate constant k = 1.05*10 10 L.mol −1 .s −1 ) 53 , which results in quantification of the homogeneously distributed HO • without interfering on the intratrack recombination of radicals occurring in the spurs. We quantified G(HO • ) of 0.200 and 0.280 µmol/J upon XR and GR irradiations respectively (Fig.…”

Section: Resultsmentioning

confidence: 99%

Breaking photoswitch activation depth limit using ionising radiation stimuli adapted to clinical application

et al. 2022

View full text Add to dashboard Cite

Electromagnetic radiation-triggered therapeutic effect has attracted a great interest over the last 50 years. However, translation to clinical applications of photoactive molecular systems developed to date is dramatically limited, mainly because their activation requires excitation by low-energy photons from the ultraviolet to near infra-red range, preventing any activation deeper than few millimetres under the skin. Herein we conceive a strategy for photosensitive-system activation potentially adapted to biological tissues without any restriction in depth. High-energy stimuli, such as those employed for radiotherapy, are used to carry energy while molecular activation is provided by local energy conversion. This concept is applied to azobenzene, one of the most established photoswitches, to build a radioswitch. The radiation-responsive molecular system developed is used to trigger cytotoxic effect on cancer cells upon gamma-ray irradiation. This breakthrough activation concept is expected to expand the scope of applications of photosensitive systems and paves the way towards the development of original therapeutic approaches.

show abstract

“…It was recently shown for hydrogenated nanodiamonds (NDs) in aqueous suspensions under X-ray irradiation. 12 Indirect demonstration were provided on boron doped diamond electrodes, 7,13 NDs 14 and silver-doped diamond thin films. 15 In a seminal work, Zhu et al demonstrated that upon DUV light excitation, a transient signal at 633 nm was observed in water above a diamond single crystal which was assigned to solvated electrons.…”

Section: Introductionmentioning

confidence: 99%

Early dynamics of the emission of solvated electrons from nanodiamonds in water

Buchner

Kirschbaum

Venerosy

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Solvated electrons are among the most reductive species in aqueous environment. Diamond materials have been proposed as a promising source for solvated electrons, but the underlying emission process in water remains elusive so far. Here, we show spectroscopic evidence for the emission of solvated electrons from nanodiamonds upon excitation with both deep ultraviolet (225 nm) and visible (400 nm) light using ultrafast transient absorption. The crucial role of surface termination for the emission process is evidenced by comparing hydrogenated, hydroxylated and carboxylated nanodiamonds. Especially, hydrogenated nanodiamonds are able to generate solvated electron upon visible light excitation, while they show a sub-ps recombination due to trap states when excited with deep ultraviolet light. The essential role of surface reconstructions on the nanodiamonds in these processes is proposed based on density functional theory calculations. These results open new perspectives for solar-driven emission of solvated electrons in aqueous phase using nanodiamonds.

show abstract

Hydrogen plasma treated nanodiamonds lead to an overproduction of hydroxyl radicals and solvated electrons in solution under ionizing radiation

Cited by 29 publications

References 45 publications

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO₂ Reduction in Room Temperature Ionic Liquids

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO₂ Reduction in Room Temperature Ionic Liquids

Breaking photoswitch activation depth limit using ionising radiation stimuli adapted to clinical application

Early dynamics of the emission of solvated electrons from nanodiamonds in water

Contact Info

Product

Resources

About

Hydrogen plasma treated nanodiamonds lead to an overproduction of hydroxyl radicals and solvated electrons in solution under ionizing radiation

Cited by 29 publications

References 45 publications

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO2 Reduction in Room Temperature Ionic Liquids

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO2 Reduction in Room Temperature Ionic Liquids

Breaking photoswitch activation depth limit using ionising radiation stimuli adapted to clinical application

Early dynamics of the emission of solvated electrons from nanodiamonds in water

Contact Info

Product

Resources

About

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO₂ Reduction in Room Temperature Ionic Liquids

Nanostructured Boron Doped Diamond Electrodes with Increased Reactivity for Solar‐Driven CO₂ Reduction in Room Temperature Ionic Liquids