Hybrid organic–inorganic porous semiconductor transducer for multi-parameters sensing

Abstract

Porous silicon (PSi) non-symmetric multi-layers are modified by organic molecular beam deposition of an organic semiconductor, namely the N,N 0 -1H,1H-perfluorobutyldicyanoperylene-carboxydi-imide (PDIF-CN 2 ). Joule evaporation of PDIF-CN 2 into the PSi sponge-like matrix not only improves but also adds transducing skills, making this solid-state device a dual signal sensor for chemical monitoring. PDIF-CN 2 modified PSi optical microcavities show an increase of about five orders of magnitude in electric current with respect to the same bare device. This feature can be used to sense volatile substances. PDIF-CN 2 also improves chemical resistance of PSi against alkaline and acid corrosion.

Hyaluronic Acid–Modified Porous Silicon Films for the Electrochemical Sensing of Bacterial Hyaluronidase

“…The pSi‐THC/HYAMA/PEGDA surface showed a much higher C/Si ratio, between 0.4 and 0.5 across the entire porous depth, compared to the pSi‐THC control which showed ratios between 0.2 and 0.3, confirming the presence of the polymer layer in the former surface. The slight decrease in the measured carbon content between the top (0.5) and bottom (0.4) of the porous layer is consistent with previously reported literature and has been attributed to lower penetration of either the polymerization mixture or UV light to the bottom of the pores.…”

Freeform Membranes with Tunable Permeability in Microfluidics

“…While these approaches have some advantages regarding larger accessible membrane areas and a wide range of commercially available membrane materials, inherent and stop flow lithography. [25][26][27][28][29][30] In the field of membrane science, photolithography has been used to produce filtration modules [31,32] or membranes with different molecular weight cutoffs for biological applications. [33] Photo-PIPS is particularly suitable for producing hydrogel membranes, which consist of scaffold-forming monomers and crosslinkers.…”

“…Its non-fouling properties make it suitable for tissue engineering applications [41,42] or vascularlike microchannel constructions. [43] Other applications use the porosity of some PEGDA materials, incorporating them for filtering [21,32] or dialysis applications. [2,31] During PIPS, different conditions are employed to fine-tune the hydrogel's properties.…”