Dimensional effect of ZnO nanorods on gas-sensing performance

Abstract

High aspect ratio ZnO nanorods with controlled diameters and lengths have been successfully prepared. The seed-mediated growth method was used to prepare the samples. An extensive investigation on the performance of the ethanol gas sensor based on ZnO nanorods has been reported. The effects of dimensions on gas-sensing performance and operating temperatures have evidently been discussed. This paper shows that the response to gas has a strong dependence on ZnO nanorod dimensions.

Low-temperature operating ZnO-based NO2 sensors: a review

“…For example, one-dimensional (1D) nanowires, nanorods, nanotubes, nanober structures, twodimensional (2D) nanosheets, nanoakes have high surfaceto-volume ratio, leading to greater electron depletion. [67][68][69][70][71] This characteristic accelerates the surface reaction, reduces the operating temperature, and nally achieves gas-sensing at lowoperating temperatures. For instance, Xia et al synthesized nanorods with different diameters through a simple nanoseedassisted method.…”

The Multisensor Array Based on Grown-On-Chip Zinc Oxide Nanorod Network for Selective Discrimination of Alcohol Vapors at Sub-ppm Range

“…This technology provides rather good control over the ZnO nanostructure morphology via seeding clusters and managing the growth temperature. Therefore, various investigations dealt with ZnO NRs fabricated in frames of hydrothermal technology to develop prototypes of sensors for detecting many gases ranged from rather simple inorganic ones like carbon dioxide [28], methane [29], nitrogen oxides [30,31,32], humidity [33], hydrogen [34,35,36], to complex organic molecules like ethanol [36,37,38,39,40,41,42,43], acetone [44,45], drugs [46] and glucose [47]. As shown in the cited literature, such ZnO NRs appear to be promising gas-sensing material for chemiresistors to detect the gases mostly at tens or hundreds of ppm concentrations in a mixture with background air.…”

Ultrahigh Sensitivity and Selectivity of Pentagonal SiC2 Monolayer Gas Sensors: The Synergistic Effect of Composition and Structural Topology

“…It is exothermic and a small barrier for these molecules to approach the P‐SiC 2 monolayer and attain a metastable state. By contrast, the adsorption energy of the P‐SiC 2 /NO 2 system is up to 0.586 eV per molecule (larger than 0.5 eV, which is taken as the reference for gas capture), indicating that P‐SiC 2 /NO 2 has adsorption energy to withstand thermal disturbance at room temperature. The results demonstrate that the P‐SiC 2 monolayer has high selectivity for NO 2 molecule.…”