Hydrogenation of HPHT nanodiamonds and their nanoscale interaction with chitosan

Kolářová, Kateřina; Bydzovska, Irena; Romanyuk, O.; Shagieva, Ekaterina; Ukraintsev, Egor; Kromka, Alexander; Rezek, Bohuslav; Stehlík, Štěpán

doi:10.1016/j.diamond.2023.109754

Cited by 11 publications

(12 citation statements)

References 72 publications

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“…[45][46][47] However, to fully hydrogenate HPHT NDs, a signicantly higher temperature of 750-800 °C is needed as shown recently. [48][49][50] Thus, to hydrogenate the ND surface DND-ar and HPHT ND-O were annealed in hydrogen gas (ow rate was 5 l min −1 ) for 6 h at atmospheric pressure at 700 °C for DNDs and 800 °C for HPHT ND. 48 The hydrogenated samples are labelled as DND-H and HPHT ND-H.…”

Section: Methodsmentioning

confidence: 99%

Absolute energy levels in nanodiamonds of different origins and surface chemistries

et al. 2023

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Section: Methodsmentioning

confidence: 99%

Absolute energy levels in nanodiamonds of different origins and surface chemistries

et al. 2023

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“…Recently, optimal hydrogenation conditions to obtain stable suspensions of MND-H in water over months were reported, 15,42 which opens the way for new investigations as presented in this paper. With stable suspensions, we were able to study how MNDs behave under gamma irradiation through the quantification of hydroxyl radicals and solvated electrons available in solution.…”

Section: ■ Discussionmentioning

confidence: 89%

Milled Nanodiamonds Overproduce Solvated Electrons while Scavenging Hydroxyl Radicals under Gamma Irradiation

Ducrozet,

Brun,

Girard

et al. 2023

J. Phys. Chem. C

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Among the different nanodiamonds, milled nanodiamonds (MNDs) from high-pressure high-temperature synthesis exhibit a crystalline quality close to that of the bulk diamond, making it a serious candidate for quantum or energy-related fields. In this study, MND aqueous suspensions with oxidized (MND-Ox) and hydrogenated (MND-H) surface chemistries were irradiated with gamma-rays. Using optimized nanoparticle-compatible methods, we revealed that MNDs in suspension enhance the production of solvated electrons under irradiation, with a higher yield for MND-H. Also, for the first time, a surface-chemistry-dependent scavenging effect of hydroxyl radicals was highlighted for this type of nanodiamonds.

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“…The process has been optimized so that such surface is fully passivated by hydrogen and contains less than 2 at% of residual oxygen. [46,60] Device Preparation: The solar cell devices were fabricated in both conventional (ITO/NDs/active layer/PDINO/Ag) and inverted (ITO/NDs/active layer/MoO 3 /Ag) architectures. All the ITO-coated glass substrates were at first cleaned in an ultrasonic bath for 15 min using toluene and isopropanol successively.…”

Section: Discussionmentioning

confidence: 99%

“…The process has been optimized so that such surface is fully passivated by hydrogen and contains less than 2 at% of residual oxygen. [ 46,60 ]…”

Section: Methodsmentioning

confidence: 99%

“…[46] One suggestion of the surface-conductive sp 2 phase could be the trans-polyacetylene (TPA) chains [59] that have been indicated by the Raman spectroscopy on the same HPHT ND-O-H sample. [46,60] In other words, while it is plausible that charge conduction processes will mostly take place at the surface of carbon nanodiamonds. In principle, the current is flowing near the surface of any conductor.…”

Section: Hpht Nd-o-h As Electron Transport Layermentioning

confidence: 99%

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Nanodiamonds as Charge Extraction Layer in Organic Solar Cells: The Impact of the Nanodiamond Surface Chemistry

et al. 2023

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Diamond nanoparticles so‐called nanodiamonds (NDs) have recently experienced raising scientific interest due to interesting optical and electronic properties, nontoxicity, biocompatibility, and large surface area. Another significant feature of NDs is the versatility of the surface chemistry, where various functional groups can be attached. This provides an excellent platform for adjusting NDs properties and functions for many applications including in photovoltaic devices. Herein, high‐pressure high‐temperature (HPHT) NDs are tested as charge extraction material in organic solar cells using various surface chemistries: as‐received (HPHT ND‐ar), oxidized (HPHT ND‐O), and hydrogenated (HPHT ND‐O‐H) NDs. Despite the high work function values (≈5.3 eV) of HPHT ND‐ar and HPHT ND‐O, which make these materials normally suitable for hole extraction, devices made with them failed. In contrast, the work function decreases upon hydrogenation (≈4.5 eV) of the beforehand oxidized NDs, making them interesting for electron extraction. By employing such HPHT ND‐O‐H for electron extraction layers, PBDB‐T:ITIC‐based devices reach 77%, while PM6:Y6‐based devices reach even 85% of the performance when process on standard ZnO electron transport layers. Improvement of the film‐forming qualities of this new electron extraction material is expected to further improve the performance.

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Hydrogenation of HPHT nanodiamonds and their nanoscale interaction with chitosan

Cited by 11 publications

References 72 publications

Absolute energy levels in nanodiamonds of different origins and surface chemistries

Absolute energy levels in nanodiamonds of different origins and surface chemistries

Milled Nanodiamonds Overproduce Solvated Electrons while Scavenging Hydroxyl Radicals under Gamma Irradiation

Nanodiamonds as Charge Extraction Layer in Organic Solar Cells: The Impact of the Nanodiamond Surface Chemistry

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