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Tungsten trioxide, amongst other metal oxides, exhibits excellent gas-sensing properties. This material is an n-type wide bandgap material, which is especially good at sensing oxidizing gases such as nitrogen dioxide. On pp. 349–354, Govender and coworkers realized that nanomaterials of tungsten trioxide allow for the tailor-making towards specific purposes and applications. However, incorporating this material into a nanosensor is still a big challenge, but is a step towards the development of low-powered devices with improved sensing capabilities for air quality monitoring. Due to the advancements in the field of nanoscience and nano¬technology, the development of nanosensors has been moving for¬ward. The use of a Focused Ion Beam (FIB) allows for making electrical contacts on micro- and nano-structures, and can be simultaneously imaged under a Scanning Electron Microscope (SEM). This creates an electrical circuit with the sensing material, which allows the monitoring of single structure's properties when interacting with a gas.