We report a facile fabrication of porous silicon nanofibers by a simple three-stage procedure. Polymer/silicon precursor composite nanofibers are first fabricated by electrospinning, a water-based spinning dope, which undergoes subsequent heat treatment and then reduction using magnesium to be converted into porous silicon nanofibers. The porous silicon nanofibers are coated with a graphene by ...

The ease of fabricating high quality photonic crystals from porous silicon and its biocompatibility have inspired the conception of various biosensing schemes using this material. However, the instability of porous silicon has significantly slowed progress in this area. Here we discuss the potential of different porous silicon photonic crystals for biosensing in the context of its surface chemi...

Recently, Porous Silicon (PS) is emerged as novel and unique material as a stable nano scale optical sensor device. In this work, one dimensional (1D) Photonic Bandgap (PBG) structures such as single layer (SL), Distributed Bragg Reflector (DBR) and Microcavity (MC) using PS material are suggested as optical sensor applications. Design and simulations are relying on the Bruggeman’s Effective Me...

We study annealing effect on hydrogen sensing properties of porous silicon (PS) samples coated by a continuous Pd layer using electrochemical method. Variation of sample current as sensitivity parameter on Schottky like Pd/PS configuration at room temperature indicate good gas sensitivity but very weak reversibility. Annealing process improve sensitivity and reversibility but increase response ...

The study of an innovative fluoropolymer masking layer for silicon anodization is proposed. Due to its high chemical resistance to hydrofluoric acid even under anodic bias, this thin film deposited by plasma has allowed the formation of deep porous silicon regions patterned on the silicon wafer. Unlike most of other masks, fluoropolymer removal after electrochemical etching is rapid and does no...

Porous silicon multilayers and microcavities, prepared by the pulsed electrochemical etching method, exhibit a variety of reflectivity and photoluminescence spectra. A comparison of the measured results with those calculated based on the transfer matrix method and quantum-box model reveals that the variation of the spectra can be attributed to the change in wavelength position of the stop-band ...

In this work, we present a novel fabrication process of lateral porous silicon membranes with tunable pore size and porosity for microfluidic applications. Our proposed method relies on the fact that the formation of porous silicon by anodization is highly dependent on the dopant concentration (Fig. 1) [1]. Here, we use ion implantation to manipulate the local dopant concentration in order to c...

Using photo electrochemical etching technique (PEC), porous silicon (PS) layers were produced on n-type (Si) wafers to generate for with an orientation of (111) The results time investigated at: (5,10,15 min). X-ray diffraction experiments revealed differences between the surface sample sheet and synthesized silicon. largest crystal size is (30 nm) lowest (28.6 analysis Atomic Force Microscopy ...

This paper presents a method for the fabrication of integrated porous silica layers in microfluidic channel networks by microfabrication techniques. Porous silica is obtained by anodization of silicon, followed by full conversion of the porous silicon network into porous silica by means of thermal oxidation. A series of experiments were performed with various channel layouts to determine the cr...