Simultaneous spectroscopic and solid-state electronic measurement of single-walled carbon nanotube devices

We describe simultaneous spectroscopic and solid-state electronic operation of a single-walled carbon nanotube (SWNT) thin film device under the influence of NH3 and NO2 gases. Using this simultaneous approach we show that both the optical absorbance and network conductance show a shared time dependency upon exposure to NH3 or NO2 gas. We show that the device behavior is dominated by gas adsorption on the SWNT network, and we explore the role of network density in regards to device behavior under gas exposure. Last, we provide evidence to suggest that the device sensitivity toward a particular analyte can be tuned by simply varying the density of the SWNT network.