Self-Assembled structures in Nanodiamond Layer by Spray technique

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Abstract

Diamond powders of various size ranging from few nanometers to tens of micrometers arecommonly used to treat the silicon substrate in order to enhance the nucleation process beforethe growth of thin diamond films by chemical vapor deposition (CVD) techniques[1 and refs.therein]. Recently a great attention is paid to nanodiamond (ND) particles which include stablenitrogen-vacancy (N-V) color centers [2]. In this work we propose the spray technique [3] todirectly deposit natural ND layers on silicon substrate using particles of 250 nm. ND particles weredispersed in the apolar solvent 1, 2 - dichloroethano (DCE) by sonication for 30 minutes. Then thedispersion was sprayed on the Si substrate, obtaining the highest ND density in the middle of it.The obtained ND films were analyzed by Raman spectroscopy, atomic force microscopy (AFM) and3D confocal microscopy. The first technique allows the measurement of the chemical andstructural composition and the photoluminescent properties, whereas the other ones measure thetopography and morphology of the layers.A careful morphological analysis showed the existence of pillar-like self-assembled structuresdistributed in an irregular way. The highest pillar density was found far from the center of thesample, where the ND layer is non-uniform. The evolution of the structures were well observed bythe 3D image analysis performed by confocal microscopy and AFM. The studyon the formationmechanisms of ND self-assembled structures will be presented and discussed.

Autore Pugliese

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  • G. Cicala ; G. Perna ; D. Marzulli ; D. Melisi ;G. De Pascali ; A. Valentini ; G.S. Senesi ; A. Massaro ; L. Velardi ; V. Capozzi

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Anno di pubblicazione

2014

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