Here, we develop a freestanding ladder-like ZnO surface with abundant unsaturated step defects, which could efficiently anchor Au₁ sites with one-dimensional assembling for the ultrasensitive NO₂ detection. The dimension of the obtained ZnO hexagonal ladder could be precisely controlled through reasonably regularizing the nucleation and growth rate. Following a layer-by-layer growth mode, the obtained ZnO would adopt the step-rich evolution. These ladder-like structures could provide abundant unsaturated step defects along with their curved edge profiles to serve as susceptible centers to site-selectively immobilize isolated Au₁ species (Au₁-ZnO). The obtained Au₁-ZnO catalysts exhibit an outstanding NO₂-sensing response (12.6 to 300 ppb) at a low operating temperature (150°C). The proposed step-induced strategy will broaden the rational design of special site-trapped supported metal catalysis for gas sensors.

在这里，我们开发了具有丰富的不饱和台阶缺陷的独立阶梯状ZnO表面，该表面可以通过一维组装有效地锚定Au ₁位，以进行超灵敏的NO ₂检测。可以通过合理地规则化成核和生长速率来精确控制所获得的ZnO六角形阶梯的尺寸。遵循逐层生长模式，获得的ZnO将采用逐步富集的演化。这些梯状结构可以提供丰富的不饱和台阶缺陷及其弯曲的边缘轮廓，以作为敏感的中心来选择性地固定孤立的Au ₁物种（Au ₁ -ZnO）。所得的Au ₁ -ZnO催化剂显示出优异的NO。在低工作温度（150°C）下₂感测响应（12.6至300 ppb）。拟议的分步诱导策略将拓宽用于气体传感器的特殊现场捕获的支持金属催化的合理设计。