Herein, we present a high-performance NO2 sensor operating at room temperature based on ZnO nanorods functionalized by nonplasmonic Pd nanoparticles. Optoelectronic measurements revealed that the ZnO/Pd hybrids exhibited high photocurrent with ultrafast rise/decay rates under visible light with optimal wavelength (λ = 475 nm), which was related to the photoexcited nonplasmonic electron injection from Pd nanoparticles to ZnO nanorods. Characterization of the visible-light-activated gas sensing performance is pursued at ppb-level of NO2 resulting in high responses, fast response/recovery rate, low detection limit as well as full reversibility. The enhanced optoelectronic NO2 sensing performance of the ZnO/Pd hybrid was attributed to the photoexcited nonplasmonic electrons. Here, we designed and demonstrated a high-performance NO2 sensing material utilizing the photoexcited nonplasmonic electrons from transition metal nanoparticles. This concept can also be extended to other metal oxide/transition metal nanoparticle heterostructures for optoelectronic devices.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry