Preparation of Au-loaded TiO2 pecan-kernel-like and its enhanced toluene sensing performance

Sensing of volatile organic compounds on two-dimensional nitrogenated holey graphene, graphdiyne, and their heterostructure

“…The calculated PDOS given in Figure7(a) shows that the VBM of the pristine C2N monolayer mainly originates from the hybridization of C(2p) and N(2p) states, whereas the CBM is dominated by N(2p) states with a noticeable contribution from C(2p) states. Figure7(a) shows a band gap of 1.66 eV for pristine C2N, in agreement with previous PBE results of the band gap value in the C2N monolayer[45]. We find that the TDOS (see Figure7(b) and (d)) for either the valence or conduction band of C2N monolayer is not significantly influenced upon acetone and propanol molecule adsorption, which is consistent with their van der Waals binding.The energy states from acetone and propanol are located at the deep energy level around 3 eV below the Fermi level (valence band) and 4 eV above the Fermi level (conduction band), as shown in Figure7(b) and (d).…”

Use of nanostructured and modified TiO2 as a gas sensing agent

“…The authors [74] revealed that Au nanoparticles act as catalysts, form a Schottky barrier between them and TiO 2 , and reduce the activation energy required for the interaction between CO and O -, which improves the sensor's response. The same gas detection mechanism was exposed by Zhang et al [108], who synthesized TiO 2 hierarchical architectures and Au-loaded TiO 2 for the detection of toluene. The results indicated that Au improved the performance of the TiO 2 sensor, especially the 5% Au/TiO 2 sensor that showed a better response (7.3), short response (4 s) and recovery (5 s) times, excellent repeatability, and stability at 100 ppm toluene at 375 ºC.…”

Au39Rh61 Alloy Nanocrystal-Decorated W18O49 for Enhanced Detection of n-Butanol

“…Furthermore, the third doublet, observed at 35.09 and 37.12 eV, resulted from W 4+ . The XPS spectra of O 1s displayed in Figure d can be classified into three Gaussian function peaks, , the O L (lattice oxygen species) component, the O V (oxygen vacancy) component, and the O C (chemisorbed oxygen species) component, indicating the different states of oxygen species on the surface of the samples. The proportions of three oxygen species of pristine W 18 O 49 and Au 39 Rh 61 –W 18 O 49 are listed in Table .…”