The use of heterojunctions is a promising solution to the problem of cross‐sensitivity in gas sensors. In this work, a carbon monoxide sensor based on the CuO/TiO₂ heterojunction was designed and fabricated. Due to the good adsorption properties of CuO materials to CO, and the heterojunction interface charge transfer, the CuO/TiO₂ thin film sensor exhibits high sensitivity to CO at room temperature. The response is as high as 10.8–200 ppm CO, about 10 times its response to H₂. Interference from H₂ is greatly reduced by optimizing the structure of the CuO/TiO₂ heterojunction. This reliable detection of carbon monoxide with excellent discrimination against H₂ is of great significance for the development of CO gas sensors.

Fullerene (C₆₀) nanowires have attracted significant attention in the past two decades due to their outstanding chemical and physical properties, which render the material a wide range of potential applications. Much effort has been devoted to exploring the growth methods, structural and compositional characterizations, and application‐related investigations of this novel carbon nanomaterial. Here, we present a review of C₆₀ nanowires in which we will first describe the recent development in the material preparations, analytical techniques, crystal structures, chemical compositions, and the investigations of polymerization processes. Afterward, we will discuss the mechanistic studies on the nanowires’ growth as the mechanism research is of great importance for their size control, large‐scale preparation, and for the exploration of applications in a wide range of fields. Finally, we will discuss the potential applications in several directions, including optical, electrical, mechanical, and biological fields, as well as our perspectives to future developments.

Exploring high efficiency S‐scheme heterojunction photocatalysts with strong redox ability for removing volatile organic compounds from the air is of great interest and importance. However, how to predict and regulate the transport of photogenerated carriers in heterojunctions is a great challenge. Here, density functional theory calculations were first used to successfully predict the formation of a CdS quantum dots/InVO₄ atomic‐layer (110)/(110) facet S‐scheme heterojunction. Subsequently, a CdS quantum dots/InVO₄ atomic‐layer was synthesized by in‐situ loading of CdS quantum dots with (110) facets onto the (110) facets of InVO₄ atomic‐layer. As a result of the deliberately constructed built‐in electric field between the adjoining facets, we obtain a remarkably enhanced photocatalytic degradation rate for ethylene. This rate is 13.8 times that of pure CdS and 13.2 times that of pure InVO₄. In‐situ irradiated X‐ray photoelectron spectroscopy, photoluminescence and time‐resolved photoluminescence measurements were carried out. These experiments validate that the built‐in electric field enhanced the dissociation of photoexcited excitons and the separation of free charge carriers, and results in the formation of S‐scheme charge transfer pathways. The reaction mechanism of the photocatalytic C₂H₄ oxidation is investigated by in‐situ electron paramagnetic resonance. This work provides a mechanistic insight into the construction and optimization of semiconductor heterojunction photocatalysts for application to environmental remediation.