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We investigate the time-dependent electronic transport in single-walledcarbon nanotubes (SWCNTs) functionalized with Au clusters on CO gas exposure.Using a tight-binding Hamiltonian and the nonequilibrium Green's function(NEGF) formalism the time-dependent zeroth and first order contributions to thecurrent are calculated. The zeroth order contribution is identified as thetime-dependent Landauer formula in terms of the slow time variable, whereas thefirst order contribution is found to be small. The Green's function for theSWCNT is derived using the equation of motion and Dyson equation technique. Theconductance is explicitly evaluated by considering a form for the hoppingintegral which accounts for the effect of dopants on the charge distribution ofthe carbon atoms and the nearest-neighbor distance. The effect of dopants isalso studied in terms of fluctuations by calculating the autocorrelationfunction for the experimental and theoretical data. These calculations allowdirect comparison with the experiment and demonstrate how the presence ofdopants modifies the conductance of the SWCNT measured experimentally andprovide the only study of fluctuations in the sensor response in terms of theautocorrelation function.

Conductance of carbon nanotubes functionalized with gold clusters during CO adsorption