Enhancement of surface electrical current on silicon via nanodiamond particles deposited by pulsed spray technique

Abstract

The deposition of as‐received nanodiamond (ND) particles on silicon substrate was performed by the pulsed spray technique, using a dispersion of 250 nm 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 μm2 of 10 pulses sample, (c) trends of measured R and calculated 1/J.

Effect of a demineralization model on the microhardness, surface roughness and topography of giomers: An in vitro study

“…Finally, R a average values for each sample were acquired through the roughness calculation complement of the ImageJ software (Ferreira & Rasb, 2012) based on pixel analysis (Cicala et al, 2015), and expressed in nm.…”

“…One independent sample of each dental material per group was examined before (0 days), after four and 7 days of immersion in the demi- Finally, R a average values for each sample were acquired through the roughness calculation complement of the ImageJ software (Ferreira & Rasb, 2012) based on pixel analysis (Cicala et al, 2015), and expressed in nm.…”

Intelligent Materials and Nanomaterials Improving Physical Properties and Control Oriented on Electronic Implementations

“…The advanced manufacturing approaches include different versatile techniques (see Table 1), such as 3D printing [6][7][8][9][10][11][12][13][14][15], 4D printing [16][17][18][19][20] (3D printing adding the time variable), innovative materials to be processed in actual industrial manufacturing processes [21][22][23][24][25][26][27][28], laser manufacturing [29][30][31][32][33][34][35][36][37], pulsed spray techniques [38][39][40][41][42][43], electrospinning techniques [44][45][46], and plasma treatments [47][48][49][50]. In Figure 3 are illustrated some graphical elements of the above-mentioned topics.…”

Geometric and electromagnetic characterization of electron beams produced by nanodiamond photocathodes

“…In the last years, new techniques have been developed, to overcome the limit of the high deposition temperature and to allow different possibilities in terms of materials used as carbon sources. One of these is the pulsed spray technique [20,21], a cheap and straightforward method which allows the deposition of layers at low temperature (∼ 150 • C), starting from a dispersion of nanodiamond (ND) particles in pure water. Indeed, high efficiency UV photocathodes based on nanodiamond layers [8,9,22] have been produced and characterized in the vacuum ultraviolet spectral range (140-210 nm).…”