Chemical gas sensors have attracted much attention with the purposes of environmental hazardous gas detection and health monitoring via exhaled breath analysis. In particular, semiconducting metal oxide (SMO)‐based chemiresistors have been considered as one of the most attractive sensing platforms owing to its simple operation, low cost, ease of miniaturization and integration to mobile devices. However, SMO‐based sensors suffer from sluggish gas reactions and poor responses. To enhance their sensing characteristics, one‐dimensional (1D) nanostructures with large surface area and high porosity are desired, since sensing reactions with analytes mainly occur at the surface of the sensing layers. In addition, uniform catalyst functionalization on SMO supports is beneficial in terms of gas response, reaction speed, and selectivity. In this review, we comprehensively highlight recent progresses on diverse hollow 1D nanofibrous structures prepared using a well‐reputed technique of electrospinning, and their unique morphological advantages as highly sensitive chemical sensing layers. Finally, future perspectives on the synthesis and sensing characterizations of hollow nanofibrous sensing materials functionalized with robust catalysts are discussed.

A novel catalyst functionalization method is proposed by I.‐D. Kim and co‐workers using the self‐assembly of protein‐encapsulated catalytic nanoparticles on polystyrene colloid templates. On page 911, these templates are employed in electrospinning to achieve well‐dispersed catalyst functionalization as well as to form open pores on WO3 nanofibers (NFs) after subsequent heat‐treatment. The improved analyte‐sensing performance is investigated with catalyst‐loaded porous WO3 NFs, demonstrating their potential for application in exhaled breath analysis to diagnose diseases.