Direct Conversion of Single‐Layer SnO Nanoplates to Multi‐Layer SnO₂ Nanoplates with Enhanced Ethanol Sensing Properties

Abstract

Direct conversion of single‐layer SnO nanoplates to multi‐layer SnO2 nanoplates is achieved by annealing in an O2 ambient at 700 °C. For 50 ppm ethanol, the sensitivities of the multi‐layer SnO2 nanoplates are more than double that of single‐layer SnO2 nanoplates, which are also formed from the single‐layer SnO. The higher sensitivity of the multi‐layer nanoplates is attributed to their larger surface/volume ratio. The facile fabrication of interconnected multi‐layer SnO2 nanoplates at low temperature directly on a Si substrate and sensing chip without the aid of catalysts offers vast advantages over competing methods for the fabrication of high‐sensitivity SnO2 sensors.

Pure and Palladium‐Loaded Co3O4 Hollow Hierarchical Nanostructures with Giant and Ultraselective Chemiresistivity to Xylene and Toluene

“…Oxide semiconductors often show their highest response to ethanol, probably because of its highr eactivity. [20][21][22][23] Accordingly,t he responses to 5ppm of p-xylene and ethanol were measured at variouss ensor temperatures to investigate the possibility of selective and sensitived etection of xylene with minimum interference from other gases (Figure 3e-h). The gas responses tended to decrease with increasing sensor temperature from 250 to 350 8C.…”

ZnS Nanostructure Arrays: A Developing Material Star

“…For example, due to a good orientation was enriched to synthesize various inorganic semiconductor nanostructures and arrays conversed from carbon and non-carbon nanostructures. [81][82][83][84] For example, Yang and co-workers reported an "epitaxial casting" approach for the synthesis of single-crystal GaN nanotube arrays with inner diameters of 30-200 nm and wall thicknesses of 5-50 nm by removing hexagonal ZnO nanowire array templates (the diameters of ZnO nanowires are 30-200 nm) by thermal reduction and evaporation. [ 81 ] Crystalline Si with tubular nanostructures were synthesized by using ZB ZnS nanowires as removable templates.…”

Two-Dimensional Materials for Sensing: Graphene and Beyond

“…Besides graphene, research has also centered on gas sensors based on various 2D materials such as TMDs especially MoS2 [80][81][82][83][84][85][86][87], WS2 [88][89][90], MoSe2 [91] and phosphorene [92,93]. 2D nanostructures in the form of nanosheets (NSs), nanowalls, nanoplates, etc., made from ZnO, NiO, CuO, WO3, SnO2, etc., have also proven as successful sensing materials, which could be used as building blocks for the fabrication of gas sensors [94][95][96][97][98][99][100][101][102][103][104][105][106][107][108].…”