A DFT study on WO3 nanowires with different orientations for NO2 sensing application

Effect of solution concentration on physicochemical and gas sensing properties of sprayed WO3 thin films

“…This implies that WO 3 film with preferred orientation along (0 0 2) has higher gas response. Similar results were obtained by Qin and Liu; they predicted theoretically that [0 1 0] oriented WO 3 films might exhibit more sensitive characteristic upon NO 2 exposure than the film with other orientations [8] At higher concentrations, few peaks with diverse orientations appeared in the XRD pattern. This indicates the increase in the crystallinity of the film which is also confirmed by calculations for the quantification of the crystalline and amorphous component in the films.…”

“…It attributes different surface electron parameters such as surface state density, adsorption desorption energies of the analyte gas molecules and activation energy of the point defects in the crystallites [9]. This results in change in chemisorption characteristics of the crystallites from one crystal orientation to another [7][8][9]. Kim et al [10] reported that SnO 2 film oriented along different planes showed the different gas response and different temperature dependence of gas response.…”

“…[2]. Among them WO 3 exhibits excellent sensing properties towards various oxidizing and reducing gases, such as NOx, H 2 S, ethanol, NH 3 , CO, and O 3 in the midst of other gases [3][4][5][6][7][8]. MOS based gas sensors are chemiresistive sensors in which resistance of the sensor changes due to the chemisorption of the gas on to the sensor surface [9].…”

Controlled synthesis of monodisperse WO3·H2O square nanoplates and their gas sensing properties

“…Except the function of specific surface area, the exposure of the facet also can affect the gas sensing distinctly [41]. According to the report of Qin et al [42], C 2 H 5 OH adsorption on different facet exposed WO 3 induces different intensity of adsorbate-surface interaction and different amount of electrons extracted from the surface. In addition, based on the nanoplates size given before, we calculate the proportion of (010) facet and the others.…”

Controllability of assemblage from WO3·H2O nanoplates to nanoflowers with the assistance of oxalic acid

“…Due to some extraordinary chemical and physical properties, WO 3 has been comprehensively applied and developed in many researches and industries, such as gas sensor [1][2][3], electrochromic [4][5][6], photochromic [7,8], solar energy devices [9,10], photocatalysts [11][12][13][14][15][16] and so on. Since many fundamental properties of semiconductor materials rely not only on the composition but also on the structure, shape and morphology, synthesis of WO 3 with a tunable shape or morphologies has been the subject of insensitive research, such as one-dimensional (1D) like nanorods [17][18][19], nanowires [20,21], and 2D like nanoplates [22], nanofilms [23][24][25], and 3D like nanoflowers [26], nanotrees [27]. In addition, many researchers had proved that the effect of size and structure on the properties of gas sensors [28,29].…”