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[Display omitted] • Porous and hollow 1D SnO 2 /Zn 2 SnO 4 composites are prepared by electrospinning. • UV light enhanced excellent TEA gas-sensing property can be primarily observed. • Greatly reduced working temperature of 120 °C and superior selectivity are gained. • Good practicality of gas sensors for food spoilage evaluation is valuable. • Enhanced mechanism is derived from the accelerated surface electron migration. Porous and hollow SnO 2 /Zn 2 SnO 4 composites with typical one-dimensional (1D) structure have been synthesized by adjusting the amounts of 2-methylimidazole zinc salt (ZIF-8) added in the precursor solution through a modified electrospinning technology. Compared with the gas-sensing performance of different samples detected in the normal condition, it is confirmed that the optimal working temperature can be markedly decreased from 260 to 120 °C under UV light irradiation, along with the substantially improved gas selectivity. In addition, SnO 2 /Zn 2 SnO 4 heterostructures exhibit a higher response (increases from 1.7 to 2.8) and faster response/recovery times (decreases from 24/154 to 14/42 s) to triethylamine (TEA) than that of the pure SnO 2. Significantly, the good practicality of gas sensors for food spoilage evaluation could be testified by effectively detecting the gas released during the putridity of prawns. UV light enhanced surface electron migration mainly contributes to the elevated synergistic effect between the formation of n-n heterojunction and tunable surface/interface electron transport behavior, as well as the adsorption and desorption of TEA molecules on the surface of the sensing materials. [ABSTRACT FROM AUTHOR]

[Display omitted] • 2D flower-like In 2 O 3 /ZnO composite derived from In 2 O 3 precursor/ZIF-8 is gained. • Composite has flower-like In 2 O 3 /ZnO structure composed of needle-like nanorods. • Sensors show an excellent gas-sensing response of 188.01 to 100 ppm TEA at 120 °C. • Mechanism is mainly due to the accelerated multi-orientation electron transport. • In 2 O 3 -based sensors can be used for actual detecting area of seafood storage. Flower-like In 2 O 3 /ZnO heterostructures consisting of the assembled needle-like nanorods derived from In 2 O 3 precursor/ZIF-8 have been prepared by a two-step approach. Flower-like In 2 O 3 /ZnO structures can be achieved by adjusting the nucleation competition and crystal surface matching of In 2 O 3 and ZnO, leading to the enhancement of gas adsorption on the surface, chemical reaction kinetics, and the electron transport efficiency. In/Zn-2 sensors exhibit excellent gas-sensing response value of 188.01 to 100 ppm triethylamine at 120 °C as well as good gas selectivity, long-term stability, and linear relationship compared with pure In 2 O 3 , mainly attributed to the accelerated multi-orientation electron transport mechanism within flower-like In 2 O 3 /ZnO heterostructures. In addition, In/Zn-2 samples can be utilized to detect the practical triethylamine gas released during the storage of marine organism (fishes). [ABSTRACT FROM AUTHOR]