Abstract
Growth of multifunctional nanohybrids with ordered porous structures is a much sought aspect for real time applications of mesoporous materials in detecting trace biomarkers in exhaled breathe. Here, we demonstrate the utilization of mesoporous silica (KIT-6) exhibiting 3-D porous structure as hard template for the development of Indium loaded WO3-SnO2 ordered nanohybrids by nanocasting approach. The negative replicated structure of In/WO3-SnO2 was tested for selective trace detection of important Volatile Organic Compounds (VOCs) present in human breathe (acetone, ethanol, formaldehyde, trimethylamine and 1,3,5 trimethylbenzene). The sensing results illustrate that In/WO3-SnO2 (2wt% In, Ra/Rg=66.5) showed 2.12 and 3.16 times better response than pure WO3-SnO2 (Ra/Rg=31.3) and In/SnO2 (Ra/Rg=21.1) nanocomposite for 50ppm acetone gas at a relatively lower operating temperature. The hybrid nanocomposite In(2)/WO3-SnO2 was able to detect 1ppm trace acetone gas with a significant rapid response (4s) and recovery time (2s) along with linear response, high stability, good reversibility and excellent selectivity. The present study reported rapid detection of important VOCs in a dynamic range from 1 to 500ppm and has potential application in designing a futuristic handheld nanostructured device with enhanced gas-sensing performance.
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