2D/2D Bi₂Se₃/SnSe₂ heterostructure with rapid NO₂ gas detection

Heterostructure engineering is crucial for enhancing gas sensing performance. However, achieving rapid response for room-temperature NO₂ sensing through rational heterostructure design remains a challenge. In this study, a Bi₂Se₃/SnSe₂ 2D/2D heterostructure was synthesized by hydrothermal method for the rapid detection of NO₂ at room temperature. By combining Bi₂Se₃ nanosheets with SnSe₂ nanosheets, the Bi₂Se₃/SnSe₂ sensor demonstrated and the lowest detection limit for NO₂ a short response time (15 s) to 10 ppm NO₂ at room temperature, reaches 25 ppb. Furthermore the sensor demonstrates significantly larger response to NO₂ than to other interfering gases, including 10 ppm NO₂, H₂S, NH₃, CH₄, CO, and SO₂,demonstrating its outstanding selectivity. And we discuss the mechanism of related performance enhancement.