Facile diamond synthesis from lower diamondoids

Park, Sulgiye; Abate, Iwnetim; Liu, Jin; Wang, Chenxu; Dahl, Jeremy E. P.; Carlson, Robert M. K.; Yang, Liuxiang; Prakapenka, Vitali B.; Greenberg, Eran; Devereaux, T. P.; Jia, Chunjing; Ewing, Rodney C.; Mao, Wendy L.; Lin, Yu

doi:10.1126/sciadv.aay9405

Cited by 31 publications

(24 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We should mention that mechanism of adamantane and diamantane molecule pyrolysis with formation of nanodiamond proposed in Ref. [ 42 ] is not viable because it involves creation of oligomers of adamantane and diamantane molecules including fragments of ordinary (cubic) diamond and its hexagonal counterpart (lonsdeleite). This would result in formation of heavily twinned nanodiamond crystals, which are not observed in experiments.…”

Section: Discussionmentioning

confidence: 99%

Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure

et al. 2022

View full text Add to dashboard Cite

Diamond properties down to the quantum-size region are still poorly understood. High-pressure high-temperature (HPHT) synthesis from chloroadamantane molecules allows precise control of nanodiamond size. Thermal stability and optical properties of nanodiamonds with sizes spanning range from <1 to 8 nm are investigated. It is shown that the existing hypothesis about enhanced thermal stability of nanodiamonds smaller than 2 nm is incorrect. The most striking feature in IR absorption of these samples is the appearance of an enhanced transmission band near the diamond Raman mode (1332 cm−1). Following the previously proposed explanation, we attribute this phenomenon to the Fano effect caused by resonance of the diamond Raman mode with continuum of conductive surface states. We assume that these surface states may be formed by reconstruction of broken bonds on the nanodiamond surfaces. This effect is also responsible for the observed asymmetry of Raman scattering peak. The mechanism of nanodiamond formation in HPHT synthesis is proposed, explaining peculiarities of their structure and properties.

show abstract

Section: Discussionmentioning

confidence: 99%

Size-Dependent Thermal Stability and Optical Properties of Ultra-Small Nanodiamonds Synthesized under High Pressure

et al. 2022

View full text Add to dashboard Cite

show abstract

“…More recently, high-pressure–high-temperature experiments were performed on different types of organic precursors. Here is given a brief overview of three complete studies [ 144 , 145 , 146 ] that span over a wide range of pressure–temperature conditions ( Table 3 , Figure 8 c).…”

Section: On the Way To Catalyst-free/binderless Synthetic Diamondsmentioning

confidence: 99%

A Review of Binderless Polycrystalline Diamonds: Focus on the High-Pressure–High-Temperature Sintering Process

2022

View full text Add to dashboard Cite

Nowadays, synthetic diamonds are easy to fabricate industrially, and a wide range of methods were developed during the last century. Among them, the high-pressure–high-temperature (HP–HT) process is the most used to prepare diamond compacts for cutting or drilling applications. However, these diamond compacts contain binder, limiting their mechanical and optical properties and their substantial uses. Binderless diamond compacts were synthesized more recently, and important developments were made to optimize the P–T conditions of sintering. Resulting sintered compacts had mechanical and optical properties at least equivalent to that of natural single crystal and higher than that of binder-containing sintered compacts, offering a huge potential market. However, pressure–temperature (P–T) conditions to sinter such bodies remain too high for an industrial transfer, making this the next challenge to be accomplished. This review gives an overview of natural diamond formation and the main experimental techniques that are used to synthesize and/or sinter diamond powders and compact objects. The focus of this review is the HP–HT process, especially for the synthesis and sintering of binderless diamonds. P–T conditions of the formation and exceptional properties of such objects are discussed and compared with classic binder-diamonds objects and with natural single-crystal diamonds. Finally, the question of an industrial transfer is asked and outlooks related to this are proposed.

show abstract

“…During the growth they introduced silane in very low quantities to create silicon vacancy centres. Furthermore, diamondoids have been used to grow nanodiamonds [185][186][187][188] using HPHT technique. The discussion on such growth is beyond the scope of this review.…”

Section: Chemical Nucleationmentioning

confidence: 99%