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Highly sensitive, temperature-dependent gas sensor based on hierarchical ZnO nanorod arrays

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C5TC02187A.pdf

Abstract:

The low-cost growth of patterned zinc oxide (ZnO) nanorod arrays (NAs) has attracted much attention
with the rapid development of electronics and nanotechnology. A mechanoelectrospinning-assisted
continuous hydrothermal synthesis method (MES-CHSM) is proposed to direct-write the precursor
patterns for the growth of the ZnO-NAs, in a digital, low-cost, and mask-free manner. The morphology
and distribution of the hierarchical ZnO nanorods, having a tremendous impact on the gas response, are
determined by the process parameters of the MES-CHSM. It is highly desirable that the diameter,
interval, orientation and distribution of the ZnO nanorods can be tuned proactively by changing the
growth time, the solution concentration, the nature of the precursor layer, and the pattern by MES. The
ZnO-NAs exert excellent Ohmic contact with interdigital electrodes when exposed to dry air, NO2 gas and then
dry air again. The gas response of the ZnO sample is surface-reaction-determining. The gas sensing results
show highly sensitive and repeatable response–recovery cycles following NO2 gas exposure and air purging,
respectively. The dynamic response of the gas sensor shows a temperature-dependent response to NO2, even
at low concentrations (1–50 ppm). The best gas response is located between 200 1C and 225 1C. Gas sensors,
prepared by different process parameters, show two laws regarding the corresponding responses and
the NO2 concentrations: approximately linear and saturation regions. The optimal process parameters
are presented to postpone the occurrence of the saturation region, to enlarge the measuring range.

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