Long response time and serious baseline drift have always hampered the practical applications of two-dimensional transition metal sulfides (TMD) in the field of gas sensors. Here, we constructed flower-like WO₃/WS₂ heterojunction materials via a low-temperature in-situ oxidation method to detect NO₂ gas. The WO₃/WS₂ sensors exhibit satisfactory improvements in the response speed, sensitivity, selectivity, and baseline drift in comparison with the original WS₂ sensor. The WO₃/WS₂ materials with different WO₃ ratios were obtained by in-situ oxidizing WS₂ under different calcination temperatures. The gas-sensing results show that the W-200 sensor has a gas response of Ra/Rg = 2.3–32 ppm NO₂, a rapid response time of 27 s, and a low detection limit of 100 ppb, accompanied by good selectivity and reproducibility to NO₂ at the optimal working temperature of 79 °C, making it a promising candidate for the optimization of WS₂-based gas sensors in practical use.

较长的响应时间和严重的基线漂移一直阻碍着二维过渡金属硫化物（TMD）在气体传感器领域的实际应用。在此，我们通过低温原位氧化方法构建了花状WO ₃ /WS ₂异质结材料来检测NO ₂气体。与原始WS ₂传感器相比， WO ₃ /WS ₂传感器在响应速度、灵敏度、选择性和基线漂移方面表现出令人满意的改进。通过在不同焙烧温度下原位氧化WS ₂得到不同WO ₃比例的WO ₃ /WS _2材料。气敏结果表明，W-200传感器对Ra/Rg = 2.3~32 ppm NO ₂的气体响应，快速响应时间为27 s，检测限低至100 ppb，并具有良好的选择性和灵敏度。对 NO ₂具有良好的重现性，使其成为实际使用中基于_{WS 2的气体传感器优化的有希望的候选者。}