Sensors have sandwich stracture metal/porous silicon/crystalhne silicon/Al. The contact metal on porous silicon was from Au and from Pd. Porosity of the samples is 57% and 63%. Low frequency noises before, during and after influence of hydrogen gas flow are studied. Noise spectra of the samples in general have Ij f^ forms with 0.7 < / < 1.
Low-frequency noise in an electrolyte-insulator-semiconductor (EIS) structure functionalized with a multilayer of polyamidoamine (PAMAM) dendrimer and single-walled carbon nanotubes (SWNT) is studied. The noise spectral density exhibits 1//'^ dependence with an exponential slope of / » 0.8 and 0.8 < / < 1.8 for the bare and functionalized EIS sensor, respectively. It has been observed that functionalisation of EIS structure with the PAMAM/SWNTs multilayer leads to an essential reduction of 1/f noise at frequencies below ~10 Hz.
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