Synthesizing a gas sensor based on heterostructured nanomaterials (NMs) via a controllable morphology by a facile hydrothermal method is an area of frontier research. In the present work, we designed a facile strategy to synthesize a controllable morphology and composition for three component heterojunctions (MoS₂-Bi₂O₃-Bi₂S₃) NMs using different hydrothermal reaction times. The Bi₂S₃ easily form as an intermediate phase due to the strong interaction of the Bi₂O₃ with MoS₂ nanosheets (NSs). The as fabricated heterojunctions MB-5 NMs exhibited a sensitive response to NO_x gas (R_a/R_g = 10.7 at 50 ppm), with an ultra-fast response time of only 1 second (s) at room temperature (RT) in air. The detection limit was predicted to be as low as 50 ppb. This sensational behaviour of the sensor reveals the outstanding morphological structure and synergistic effect of the MoS₂ NSs with Bi₂O₃ nanoparticles (NPs), which was realized by the flow of electrons across MoS₂-Bi₂O₃-Bi₂S₃ interfaces through band energy alignment.

利用简便的水热法通过可控的形态合成基于异质结构纳米材料（NMs）的气体传感器是前沿研究领域。在目前的工作中，我们设计了一种简便的策略，以使用不同的水热反应时间来合成三组分异质结（MoS ₂ -Bi ₂ O ₃ -Bi ₂ S ₃）NM的可控形态和组成。由于Bi ₂ O ₃与MoS ₂纳米片（NSs）的强相互作用，Bi ₂ S ₃容易形成为中间相。所制造的异质结MB-5 NM对NO表现出敏感的响应_x气体（ 在50 ppm时R _a / R _g = 10.7），在室温（RT）下在空气中的响应时间仅为1秒。预测检出限低至50 ppb。传感器的这种刺激行为揭示了MoS ₂ NS与Bi ₂ O ₃纳米颗粒（NPs）的杰出形态结构和协同效应，这是通过电子跨MoS ₂ -Bi ₂ O ₃ -Bi ₂ S ₃流动实现的通过带能量对齐进行交互。