Abstract

The deposition of as-received nanodiamond (ND) particles on silicon substrate was performed by the pulsed spray technique, using a dispersion of 250nm ND in 1,2-dichloroethane. A set of samples was sprayed by varying the number of pulses from 1 to 500. The morphology of the samples was characterized and monitored by means of optical, atomic force, and confocal microscopies. At a low number of pulses, sparse diamond particles were observed, whereas at a high number of pulses dense/quasi-continuous ND layers were formed. The electrical conductivity measurements of surface silicon substrate evidenced a remarkable change for the presence of ND particles. This behavior is also found by theoretical simulations (finite element method). Finally, a comparison between the electrical resistances measured on these samples versus the pulse number and the inverse current density calculated as a function of the number of ND particles, showed a good agreement. The experimental results highlighted an increase of the electrical current by using a number of pulses <100, whereas the simulation results proved the enhancement of current density and its surface rectification by employing a specific number of particles. The current increased by increasing the temperature and during the heating-cooling cycles hysteresis was observed. (a) Scheme of the sprayed ND particles on silicon substrate, (b) 3D AFM image 5×5?m² of 10 pulses sample, (c) trends of measured R and calculated 1/J.

Autore Pugliese

• Marzulli Domenico , Senesi Giorgio Saverio , Cicala Grazia

Tutti gli autori

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

Titolo volume/Rivista

Physica status solidi. A, Applications and materials science

Anno di pubblicazione

2015

ISSN

1862-6300

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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