Patent ID: 7801687
Filing Date: 2010-09-21
Classification: G01N,Y10S

Abstract:
1. A method for providing a sensor for presence of at least one of a first selected gas molecule and a second selected gas molecule, the method comprising: providing, in a chamber, first and second interdigitated electrodes, which are connected to at least one of (i) a voltage source having a controllable voltage difference and (ii) a controllable current source; providing a zeroth order electrically conducting network, numbered 0, of uncoated single wall carbon nanotubes (“SWCNTs”) forming a path P0 between the first and second electrodes; providing N electrically conducting networks, numbered n=1, . . . , N (N≧1) of single wall carbon nanotubes (“SWCNTs”) forming paths Pn (n=1, . . . , N) between the first and second electrodes, where at least one SWCNT in each of the networks no. n (n=1, . . . , N) is loaded with molecules of a selected chemical no. n; providing in the chamber a gas G that may have molecules of a gas constituent no. m present in a concentration C providing an electrical parameter value (“response value”) V adding a known concentration increment Δ comparing differences, V wherein the process of estimating at least one of (i) the concentration C and (ii) the concentration upper bound and (iii) the concentration lower bound comprises: providing an error function ε(C  where a forming M partial derivatives of the error function 2ε(C solving the M non-homogeneous linear equations to provide values, C associating at least one of the values C