We present an experimental study on the etching of detonation nanodiamond (DND) seeds during typical microwave chemical vapor deposition (MWCVD)conditions leading to ultra-thin diamond film formation, which is fundamental for many technological applications. The temporal evolution of the surface density of seeds on the Si(100) substrate has been assessed by scanning electron microscopy (SEM). The resulting kinetics have been explained in the framework of a model based on the effect of the particle size, according to the Young-Laplace equation,on both chemical potential of carbon atoms in DND and activation energy of the reaction with atomic hydrogen. The model describes the experimental kinetics of seeds' disappearance by assuming that nanodiamond particles with a size smaller than a "critical radius", r*, are etched away while those greater than r* can grow. Finally, the model allows to estimate the rate coefficients for growth and etching from the experimental kinetics.

Salerno, R., Pede, B., Mastellone, M., Serpente, V., Valentini, V., Bellucci, A., et al. (2023). Etching kinetics of nanodiamond seeds in the early stages of CVD diamond growth. ACS OMEGA, 8(28), 25496-25505 [10.1021/acsomega.3c03080].

Etching kinetics of nanodiamond seeds in the early stages of CVD diamond growth

Domenici, F;Tomellini, M
;
Polini, R
2023-07-18

Abstract

We present an experimental study on the etching of detonation nanodiamond (DND) seeds during typical microwave chemical vapor deposition (MWCVD)conditions leading to ultra-thin diamond film formation, which is fundamental for many technological applications. The temporal evolution of the surface density of seeds on the Si(100) substrate has been assessed by scanning electron microscopy (SEM). The resulting kinetics have been explained in the framework of a model based on the effect of the particle size, according to the Young-Laplace equation,on both chemical potential of carbon atoms in DND and activation energy of the reaction with atomic hydrogen. The model describes the experimental kinetics of seeds' disappearance by assuming that nanodiamond particles with a size smaller than a "critical radius", r*, are etched away while those greater than r* can grow. Finally, the model allows to estimate the rate coefficients for growth and etching from the experimental kinetics.
18-lug-2023
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/03 - CHIMICA GENERALE E INORGANICA
English
Carbon
Chemical Vapor Deposition
Etching
Plasma
Salerno, R., Pede, B., Mastellone, M., Serpente, V., Valentini, V., Bellucci, A., et al. (2023). Etching kinetics of nanodiamond seeds in the early stages of CVD diamond growth. ACS OMEGA, 8(28), 25496-25505 [10.1021/acsomega.3c03080].
Salerno, R; Pede, B; Mastellone, M; Serpente, V; Valentini, V; Bellucci, A; Trucchi, D; Domenici, F; Tomellini, M; Polini, R
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/332564
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