Small hollow ternary composite oxide semiconductor nanomaterials for conductometric HCHO sensors

Preparation of Pt/WO3@ZnO hollow spheres for low-temperature and high-efficiency detection of triethylamine

“…Compared to WZ-0 and WZ-2, Pt modification of WO 3 /ZnO composites elevates the initial resistance to the order of GΩ, indicating the presence of strong electron sensitization. Besides, Pt can promote gas adsorption/desorption, 60 and the XPS results also confirm that the content of O C in 1Pt/ WZ-2 is substantially higher compared to that in WZ-0 and WZ-2, with fewer free electrons in the conduction band, leading to a thicker EDL and higher resistance in air. The introduction of ZnO and Pt not only improves the response of WO 3 -based gas sensors to TEA but also shortens the response/ recovery time.…”

“…Fig. 4i shows the dynamic response of 1Pt/WZ-2 under different humidity conditions (20,40,60, 80, 99% RH) for 50 ppm TEA at 100 °C. Water molecules compete with molecules of TEA for free oxygen ions on the material surface, and resistance values in air and responses (summarized in Fig.…”

Novel Immunosensor Based on Metal Single-Atom Nanozymes with Enhanced Oxidase-Like Activity for Capsaicin Analysis in Spicy Food

“…According to the XPS spectrum records (Figure S5A), there are binding energies of C, N, O, and Fe elements, while no Zn elements were 1053 nm. 35 As shown in Figure S5B, high-resolution XPS C 1s spectra for Fe 0.7 /NC showed four peaks at binding energies of 284.7, 285.6, 288.5, and 290.4 eV, respectively, which were putatively assigned to C−C, C−N, C�O, and π−π* transition, respectively. 36 In Figure S5C, the Fe 2p XPS spectrum for Fe 0.7 /NC was deconvoluted to four major peaks at 726.2, 723.1, 711.1, and 709.3 eV, which were assigned to the presence of Fe in the oxidation state of Fe 3+ and Fe 2+ , respectively.…”

“…XPS analyses were performed to identify the Fe 0.7 /NC valence states and composition. According to the XPS spectrum records (Figure S5A), there are binding energies of C, N, O, and Fe elements, while no Zn elements were 1053 nm . As shown in Figure S5B, high-resolution XPS C 1s spectra for Fe 0.7 /NC showed four peaks at binding energies of 284.7, 285.6, 288.5, and 290.4 eV, respectively, which were putatively assigned to C–C, C–N, CO, and π–π* transition, respectively .…”

Ar plasma-engraved rGO/In2O3 hollow nanospheres with rich oxygen vacancies for enhanced triethylamine detection

“…A quantitative amount of gas analytical liquid is injected into the 1 l glass chamber used for gas testing, covered with a stopper, and the evaporation of the measured liquid is accelerated by shaking the bottle body multiple times, so that the corresponding gas can fill the entire test chamber. The formula for the concentration (C (ppm)) of the gas is given as follows [15,16].…”