Electrostatic self-assembly of diamond nanoparticles

Hees, Jakob; Kriele, Armin; Williams, Oliver A.

doi:10.1016/j.cplett.2011.04.083

Cited by 136 publications

(168 citation statements)

References 23 publications

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“…Of course, the nucleation process depends also on other conditions, i.e. pH of used liquid [22], power and frequency of the ultrasound, duration of agitation and naturally the growth of diamond layer depends on applied growth conditions. The best results were obtained by using the solution of nanodiamond powder with Co and Y.…”

Section: Resultsmentioning

confidence: 99%

Study of diamond film nucleation by ultrasonic seeding in different solutions

et al. 2011

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Ê Ú ¿½ Ñ Ö ¾¼½¼ ÔØ ½ Ë ÔØ Ñ Ö ¾¼½½ ×ØÖ ØIn this study we have investigated diamond nucleation on Si substrates by ultrasonic seeding with different liquid solutions of Ultradispersed Detonation Diamond (UDD) powder in a mixture of metal nano-or microparticles (Ni, Co, Y). The influence of different solutions on nucleation efficiency was investigated. For highlighting nucleation centers and better evaluation of the nucleation process the nucleated samples were moved into a Microwave Plasma Enhanced Chemical Vapor Deposition (MW CVD) reactor and a "short-time" (10 min), then followed by a "long-time" (+1 hour), diamond deposition was performed. The morphology of samples was characterized by Scanning Electron Microscopy (SEM) and the chemical composition of grown diamond layer was investigated by Raman Spectroscopy. From the measurements we found out that microsized metal particles positively influenced nucleation and the uniformity of the deposited diamond thin film. The lowest surface roughness was achieved in the case of nanodiamond powder mixed with Co and Y metal powder.

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Section: Resultsmentioning

confidence: 99%

Study of diamond film nucleation by ultrasonic seeding in different solutions

et al. 2011

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“…The measured size value is larger than 5 nm (producer's value), which we ascribe to agglomeration of ND in suspensions. [21,22]. Fig.…”

Section: Methodsmentioning

confidence: 99%

Enhanced Diamond Nucleation on Cemented Carbide Cutting Tools by Employing Electrostatic Self-Assembly Seeding

Wang¹,

Handschuh‐Wang²,

Jiang³

et al. 2016

Proceedings of the 3rd International Conference on Material Engineering and Application (ICMEA 2016)

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Abstract. Nanodiamond seeding is a well-established approach to enhance the nucleation density in chemical vapor deposition (CVD) diamond growth. However, nanodiamond seeding is highly dependent on the properties of nanodiamond particles, the solvent and the substrate. In this work we present a simple electrostatic self-assembly method to enhance the nucleation of diamond film on cemented carbide (WC-Co) substrates. The nanodiamond particles were adsorbed to WC-Co substrate surfaces governed by electrostatic interactions, which can be controlled by the surface groups of the particles and the pH of a solvent. By varying the pH of the media, the nanodiamond particles were rendered either positively or negatively charged. The positive charged nanodiamond particles (pH < 2.5) enhanced the nucleation of diamond on oxidized WC-Co substrates. The highest nucleation density of diamond on WC-Co substrates was achieved to be 1.0 ± 0.1 × 10 10 cm -2 , which is comparable to the highest record achieved by applying bias voltage to generate plasma. The nanodiamond particles also shortened the incubation time of diamond nucleation to less than 10 min on TiB 2 interlayer. This electrostatic induced adsorption of diamond nanoparticles is crucial for the development of ultra-high nucleation densities for the growth of high performance nanocrystalline diamond films, especially for micro sized tools with sharp cutting edges applying for Micro and Nano Electro-Mechanical Systems.

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“…Usually, ND particles produced by the detonation process are tightly bound in aggregates that are difficult to separate into monodisperse particle colloids. 25,53 No dynamic light scattering data were available for the ND suspension in isopropyl alcohol used in the present study, but it likely contains a broad range of particle sizes. In fact, a nearly full sedimentation of the suspension was observed after about 2 hours after completion of the ultrasonic agitation.…”

Section: Interactions Between Substrate Surface and Nd Particlesmentioning

confidence: 99%

“…An electrostatic self-assembly seeding process with such modified ND particles on copper and SiO 2 substrates was reported. 25,26 Also, the deposition of two-dimensional monolayers of ND particles by combined ultracentrifugation and electrophoresis techniques has been shown lately. 27 Yet, no studies have been reported that focused on the (possible) relationship between the topography of the substrate surface and the assembly of ND particle seeds onto it.…”

Section: Of 36mentioning

confidence: 99%

“…This is in line with several recent reports that focused on the seeding of ND particles by electrostatic self-assembly. [24][25][26]51,52 Electrostatic grafting on substrates (with or without surface modification) can result in a very high density and uniformity of ND particles if a properly selected surface modification and fractionalization of the ND particles are employed to improve their dispersion and to separate those particles into a more narrow range of particle sizes. 26,52 Ideally, ND particles are anchored to the substrate surface as seeds of single grain size for NCD film growth, but it is well known that the formation of ND particle agglomerates is difficult to avoid.…”

Section: Interactions Between Substrate Surface and Nd Particlesmentioning

confidence: 99%

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Metallic Seed Nanolayers for Enhanced Nucleation of Nanocrystalline Diamond Thin Films

et al. 2013

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ABSTRACT:The enhancement of the nucleation and subsequent growth of nanocrystalline diamond (NCD) films with a submicron thickness control on silicon substrates is demonstrated by using a sputter deposition of six different metallic (Cr, Mo, Nb, Ti, V, and W) seed nanolayers. The effectiveness of altered surface morphology and surface chemistry is discussed. We show that the number density of nanodiamond particles embedded on the nanorough metallic surfaces after an ultrasonic seeding step together with the dynamic surface chemistry during hot-filament chemical vapor deposition of diamond determine the nucleation kinetics, microstructure and surface topography of the NCD films. Overall, the smoothest NCD layer (root-mean-square roughness 10 nm) was obtained with the highest seed density of diamond nanoparticles anchored to the metallic (W) surface. In particular, the rapid carbide-forming metals Mo, Nb and W showed the highest number density of diamond crystallites formed during the NCD nucleation stage, which resulted in dense, uniform and very smooth NCD films. Much rougher NCD films (17-37 nm) were obtained on the Cr, Ti, and V nanolayers that did not form carbides rapidly.Importantly, the carbon phase purity of the grown NCD films remains unaffected by the presence of different metallic seed nanolayers. Furthermore, we have assessed that the metallic nanolayer surface morphology does not play a relevant role in the enhancement of the seeding step.

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Electrostatic self-assembly of diamond nanoparticles

Cited by 136 publications

References 23 publications

Study of diamond film nucleation by ultrasonic seeding in different solutions

Study of diamond film nucleation by ultrasonic seeding in different solutions

Enhanced Diamond Nucleation on Cemented Carbide Cutting Tools by Employing Electrostatic Self-Assembly Seeding

Metallic Seed Nanolayers for Enhanced Nucleation of Nanocrystalline Diamond Thin Films

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