A novel porous silicon sensor for detection of sub-ppm NO2 concentrations

Porous Silicon Sensors - from Single Layers to Multilayer Structures

“…This effect lets to scale the system as a biosensor by correlating the device electric capacity to the presence and solution density of the target molecule. The complete electric model for the sensor is composed by a capacitance associated to a parallel and a serial conductance (representing relaxation constants of the material according to the working frequency) that make necessary to assess the impedance spectroscopy (Baratto et al, 2001) to determine the particular frequency at which we have the maximum gas sensitivity.…”

Study of growth of dot and column in porous silicon samples of various thicknesses prepared at a constant current density

“…Recently, PS based birefringent membranes [2], filters [3], novel NO 2 gas sensors [4] and a multifunctional drug delivery system to the bone marrow is developed [5]. Every field of applications, require an optimized PS structure under experimental conditions.…”

Selective Response of Mesoporous Silicon to Adsorbants with Nitro Groups

“…[8] Finally, PSi has previously been shown to have sub-ppm sensitivity to NO and NO 2 gas, [41] and an NO 2 sensor using changes in conductance of PSi has been demonstrated to work well in a range of ambient temperatures and humidities. [42][43][44]. It has also been demonstrated that aged PSi shows greater reversibility to NO 2 detection and less sensitivity to air moisture, [45] suggesting that PSi may be a very practical field sensor.…”