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Currently, the construction of three-dimensional (3D) flower-like SnS 2 /In 2 S 3 heterostructures has been primarily developed for low-temperature gas-sensing detection of triethylamine (TEA) by a facile hydrothermal treatment. The thickness of nanosheets and the number of folds of self-assembled products can be well regulated as the introduction of In component increasing, as well as the distribution of effective SnS 2 –In 2 S 3 heterojunctions. All the as-prepared SnS 2 -based sensors can exhibit good gas sensitive response behavior to TEA at various low operating temperatures, even for the first time at room temperature. For example, the optimal SnS 2 -1% In have the highest response (21.01), the relatively fast response/recovery times, and superior gas selectivity and stability to 100 ppm TEA at 40 °C, compared with other samples. Besides the combination of the formation of SnS 2 –In 2 S 3 heterojunctions, abundant active sites of the self-assembled structures, and unique surface/interface transmission mechanism is beneficial to the enhanced gas-sensing performance, significantly, the generation of state density resonance effect can be employed for improving the electron transport efficiency due to the adjustment of state density near the Femi level. The available long-term, cycling, and humidity stabilities and the linear response relationship of the sensors greatly contribute for the potential application of seafood storage evaluation. • Flower-like SnS 2 /In 2 S 3 self-assembly with effective heterojunctions is obtained. • SnS 2 -based sensors can exhibit superior TEA-sensing behavior at low temperatures. • Available state density resonance effect plays the key role of sensing behavior. • SnS 2 /In 2 S 3 sensors can be used for the application of seafood storage evaluation. • Construction of new TEA sensors with state density resonance effect is provided. [ABSTRACT FROM AUTHOR]