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Ammonia is an important breath marker for non-invasive detection and monitoring of end-stage renal disease (ESRD). Here, a chemo-resistive gas sensor has been developed consisting of flame-made nanostructured α-MoO3 with ribbon-like and nanoparticle/needle-like morphologies. A key novelty is the thermal stabilization of α-MoO3 by Si-doping inhibiting sintering and crystal growth at the operational conditions of such sensors. In situ XRD analysis of the MoOx phase dynamics revealed an optimal annealing temperature of 450 °C for synthesis of highly nanocrystalline α-MoO3. For selective NH3 sensing, however, the optimum SiO2 content was 3 wt% and the operational temperature 400 °C. This sensor showed superior NH3 selectivity toward acetone, NO and CO, and accurately detected breath-relevant NH3 concentrations down to 400 ppb under 90% relative humidity (RH). As a result, a stable and inexpensive sensor for NH3 is presented which has the potential for further development toward a hand-held device for the early-stage diagnosis and monitoring of ESRD.

P1DH.13 - Si-doped α-MoO3 sensing nanoparticles for selective breath NH3 detection