Conductometric acetic anhydride gas sensors based on S-doped porous ZnO microspheres with enhanced Lewis base interaction

Highly Selective and ppb-Level Butanone Sensors Based on SnO2/NiO Heterojunction-Modified ZnO Nanosheets with Electron Polarity Transport Properties

“…Figure S2 shows the XRD patterns of ZnO, SnO 2 /NiO, and SnO 2 /NiO@ZnO. The diffraction peaks of ZnO are perfectly consistent with the standard card of zincite ZnO phases (PDF #75-0576) 22 without excess diffraction peaks, which indicates the good crystallinity and purity of ZnO. The diffraction peaks of SnO 2 /NiO appear simultaneously with the peaks of SnO 2 (PDF #88-0287) 28 and NiO (PDF #71-1179), 29 illustrating the successful synthesis of heterojunction materials.…”

“…Figure S5b shows the high-resolution spectra of Zn elements. The peak of Zn in SnO 2 /NiO@ZnO shifts negatively with respect to ZnO, indicating that the addition of SnO 2 /NiO results in less electron gain for the Zn atom . The high-resolution spectrum of O 1s for ZnO is shown in Figure S5c, where the O 1s peak is fitted to three peaks at binding energies of 530.2, 531.1 and 532.2 eV represented by O L , O V , and O C , respectively.…”

Expanding Selectivity Functionality of a ZnO Nanotetrapod-Based Volatile Organic Compound Sensor Using Au Nanoparticle Decoration

“…30 The enhancements in sensing properties brought by Au decoration are attributed to the catalytic properties and chemical sensitization effect of Au NPs. 23,41 Schottky barriers are formed at the interface between Au NPs and ZnO NTPs, which can improve the response of the sensor. 29,42 The work function of Au (5.1 eV) is higher than that of ZnO (4.1 eV).…”

“…The enhancements in sensing properties brought by Au decoration are attributed to the catalytic properties and chemical sensitization effect of Au NPs. , Schottky barriers are formed at the interface between Au NPs and ZnO NTPs, which can improve the response of the sensor. , The work function of Au (5.1 eV) is higher than that of ZnO (4.1 eV). Thus, when the Au NPs are in contact with ZnO, electrons transfer from ZnO to Au to reach equilibrium of Fermi energies and cause energy band bending, as shown in Figure b.…”

“…Using noble metal nanoparticles (NPs) to decorate the surface of semiconductors is a general approach for improving their sensing performance. − Numerous papers have reported that decorating the semiconductor surface using noble metal NPs can improve the response magnitude, decrease the activation barrier for the response and decrease the optimal detection temperature of the sensor. For example, the WS 2 /Au/ZnO nanorod-based sensor exhibits a 40% higher response to 20 ppm NO 2 than the ZnO nanorod-based sensor under 365 or 455 nm light activation.…”