Highly selective of carcinogenic and flammable p-xylene vapor and its sensing detection through metal oxides-based sensors has recently attracted much attention. In this work, mesoporous CeO₂ nanosheets were synthesized by simple cerium nitrate impregnation and air calcination using rose petals as bio-template. The effect of calcination temperature on its microstructure, Ce³⁺/Ce⁴⁺ mole ratio, as well as sensing performance was investigated. The CeO₂-650 ultrathin nanosheets calcined at 650 °C are assembled by cross-linking nanoparticles with small size, which possess homogeneous mesoporous distribution and relatively large specific surface area. At 217 °C, the sensor fabricated from CeO₂-650 ultrathin nanosheets shows short response time (T_res = 5 s), high selectivity and response (S = 22.1) towards 100 ppm p-xylene vapor, and its limit of detection (30 ppb) is the lowest among reported sensors based on pure metal oxides. The good sensing performance mainly originate from the synergistic effect of intrinsic features of mesoporous CeO₂-650 ultrathin nanosheets, surface adsorbed oxygen control, oxygen vacancy defects induced by Ce³⁺ and biotemplate imprinting. Therefore, mesoporous CeO₂-650 ultrathin nanosheets could be utilized as candidate for the detection of trace p-xylene vapor.

对致癌和易燃的对二甲苯蒸气的高度选择性及其通过基于金属氧化物的传感器的传感检测最近引起了广泛关注。在这项工作中，以玫瑰花瓣为生物模板，通过简单的硝酸铈浸渍和空气煅烧合成了介孔 CeO ₂纳米片。研究了煅烧温度对其微观结构、Ce ³⁺ /Ce ⁴⁺摩尔比以及传感性能的影响。在 650°C 煅烧的 CeO ₂ -650 超薄纳米片由小尺寸的交联纳米粒子组装而成，具有均匀的介孔分布和较大的比表面积。在 217 °C 时，由 CeO ₂制成的传感器-650 超薄纳米片显示出响应时间短 ( T _res  = 5 s)、高选择性和 对 100 ppm对二甲苯蒸气的响应 ( S = 22.1) ，其检测限 (30 ppb) 在已报告的传感器中最低纯金属氧化物。良好的传感性能主要源于介孔CeO ₂ -650 超薄纳米片的固有特性、表面吸附氧控制、Ce ³⁺诱导的氧空位缺陷和生物模板印迹的协同作用。因此，介孔CeO ₂ -650 超薄纳米片可用作检测痕量对二甲苯蒸气的候选物。