Ayoub Laghrissi

University of Southern Denmark | SDU · Mads Clausen Institute

The sonochemical processing of nanomaterials in a solution is well established and has been advantageously used for a variety of nanomaterials and morphologies thereof. In general, high energy and high frequency ultrasound is applied to a solution containing the ionic species of the elements to be reduced as well as a certain amount of reducing che...

Au/Pd/Au and Au/Pd layered nanorods (NR) with different Pd thickness, down to 15 nm, are electrodeposited in Si-supported porous anodized aluminum thin film templates. These structures are, in contrast to Au-Pd core-shells, mechanically relaxed, so that chemical and electronic interaction effects between Au and Pd are expected to predominate in con...

The electrochemical properties of Pt-based 1D electrocatalysts reported so far prove to be superior to those of known 0D nanomaterials. Particularly, the combination of Pt and Pd either as nanoalloys or Pt-coated Pd nanotubes (NTs) demonstrably boost catalyst performance. This provided the main impetus for the present work. The porous PtPd-NTs are...

Implants based on NiTi shape memory alloys may be overgrown with cells which is undesirable in traumatology and stenting. The processing of a self-organized nanotube (NT) layer and its functionalization with a polymer that resists protein and cell adhesion can help solving this issue. The necessary mechanical strength of the layer should arise from...

In this paper we report on the fabrication of inorganic/organic nanocomposite films consisting of alternating layers of LAPONITE® / (3-Aminopropyl)trimethoxysilane (APTMS)/ antifouling poly(oligo ethyleneglycol)-methylether-methacrylate (POEGMA) brushes using a simple sequence of dip-coating and surface-initiated atom transfer radical polymerizatio...

Ordered thin films of Au nanorods (NRs) on Ti/Au/Si heterostructure substrates are electrodeposited in thin film aluminum oxide templates and, after template removal, serve as supports for Pd and Pt nanocatalysts. Based on previous work which showed a better electrocatalytic performance for layered Au/Pd nanostructures than monolithic Pd, electrode...

Simple and quick techniques for assembling nanoparticles in topographically designed Poly(dimethylsiloxane) moulds of nanosized shapes have great potential in many spectroscopic and sensing tools. Close-packed particles pose rich plasmonic resonances, enabling the optical response to be tailored on both the nano- and macroscale. Template-assisted s...

Surface plasmon polariton excitation was demonstrated by fluorescent light from organic para-hexaphenylene (p-6P) nanofibers grown directly on a silver thin film surface. We show results of both photoluminescence lifetime measurements and angle-resolved leakage radiation spectroscopy in the excitation range 420–620 nm, which corresponds to the mate...

In this paper, hard-anodized aluminum is used as a substrate to support a polymeric anti-biofouling coating based on a non-toxic, environmentally benign zwitterionic polymer (sulfobetaine methacrylate (pSBMA)). The coating is processed from an aqueous solution of the monomer via a photografting technique. Nanostructured coatings are obtained with a...

TiN nanostructures have been shown to exhibit promising plasmonic properties and are potential candidates for various applications, including energy harvesting. However, these properties also show a strong dependence on the processing conditions which have been reported to affect metallicity of TiN. Herein, we report on layered TiN@Au-nanorods (NRs...

Nanocomposites are known for their unique properties with many potential applications. In the present work, porous anodic aluminum oxide (AAO) thin films were processed on glass substrates and subsequently photo-grafted with a zwitterionic anti-biofouling polymer. This allows to fabricate scratch-resistant, transparent anti-biofouling films. The mi...

Interdiffusion between Si substrate and nanorod arrays of Au, Pt, and AuPt nanoalloys is investigated at temperatures lower than the AuSi eutectic temperature. When the nanorod is pure Au, Si diffusion from the substrate is very rapid. Au atoms are completely replaced by Si, converting the nanostructure into one of Si nanorod arrays. Au is diffused...

The data presented in this article affords insight into the fabrication and ensuing microstructure of the supported porous anodic aluminum oxide (AAO) and TiO 2 -nanotubes (NT) films that are used for the subsequent grafting of antifouling poly(oligo ethyleneglycol) methylether methacrylate (POEGMA) and poly acrylamide (PAAm) brushes. The experimen...

Non-fouling polymer films have a wide application potential spanning the areas of biotechnology, smart implants and submerse maritime surfaces. The films reported hitherto are, however, ultrathin and lack the mechanical strength and scratch resistance that could qualify them for technological applications. Herein we report on non-fouling polymer na...

Using a composition of first-principle density functional theory (DFT) calculations and Monte Carlo simulation with the calculation within the self-interaction-correction local-density approximation, the electronic, magnetic, and optical properties of doped and co-doped GaN (Ga1−xCrxN, Ga1−xNixN) and GaN (Ga1−2xCrxNixN) (x = 0.03 and 0.06), respect...

SnO2:TM (V, Cr, Mn and Fe) based dilute magnetic semiconductors are investigated within self-interaction-corrected local density approximation (LSDA-SIC) from first-principles calculation. LSDA-SIC results are compared with the calculated ones within standard LSDA, the stable magnetic state of the system is evaluated by comparing the total energies...

TiO2:TM (TM: Cr and Fe) based dilute magnetic semiconductors are investigated within self-interaction-corrected local density approximation (SIC-PBE) from first-principles calculation. These results are compared with those calculated within standard PBE, In this system, the stability of the ferromagnetic state compared with the spin-glass state is...

Using the first principles with local density approximation (LDA) and self-interaction-corrected local density approximation (SIC-LDA), the electronic structure of transition metal-doped copper indium sulfide chalcopyrite (CuInS2) has been calculated and the effect of low-impurity concentration on magnetic structure has been carried out for both LD...

MgH2: TM (TM: V, Cr, Mn, Fe, Co, Ni) based dilute magnetic semiconductors (DMS) are investigated using first principle calculations. Our results show that the ferromagnetic state is stable when TM introduces magnetic moments as well as intrinsic carriers in TM: Co, V, Cr, Ti; Mg0.95TM0.05H2. Some of the DMS Ferro magnets under study exhibit a half-...

In this paper we will use the first-principles calculations to study the electronic structure, magnetic and optical properties of (Cu,TM)AlO2 (TM: Ti, V, Cr, Mn and Fe) based dilute magnetic semiconductors (DMS), and we will evaluate The energy difference between the ferromagnetic and disorder local moment states. Also, the ferromagnetic stability...

The magnetic and magnetocaloric properties of DyNi4Si alloys in YNi4Si-type orthorhombic structure have been investigated by using a combination of first-principles calculations and mean field theory, effective field theory, and Monte Carlo simulation. We find that Magnetic results of DyNi4Si compound show ferromagnetic-type ordering at 19 K, the m...