Wood has attracted increasing scientific interest in the field of green electronics, biological devices, bioenergy, and energy storage because of its abundance, low cost, biocompatibility, and natural vessel structure. However, its potential application in the important area of environmental monitoring has not yet been effectively explored. In this work, gold nanoparticles (NPs) encapsulated in porous wood (denoted as [email protected]) for high-performance colorimetric detection of Hg²⁺ in aqueous solution have been constructed. The detection mechanism is based on Hg²⁺-triggered methylene blue (MB) reduction-assisted signal amplification. In such a detection system, Au NPs can be used as a specific identification element for the binding of Hg²⁺ due to the formation of gold amalgam to initiate catalytic activity of gold. The low-cost natural wood is introduced to prevent the aggregation of Au NPs and increase the contact area between MB and Au NPs in three-dimensional space. MB, as a tracer molecule, enables the output signals to be directly observed by the naked eye. Such a detection system exhibited an ultralow detection limit of 32 pM for Hg²⁺, which is greatly lower than the threshold levels (10 nM) for drinking water and other colorimetric methods. The proposed detection system also exhibits high selectivity against other metal ions and works well for environmental water and blood samples. The resultant [email protected] sensor is low cost, easy handling, and convenient, making it an attractive material for point-of-use monitoring of Hg²⁺ in environmental and biological samples.

中文翻译：

---

基于会员孔材扩增测色传感器对Hg ²⁺检测通过汞²⁺ -Triggered亚甲基蓝还原反应

木材因其丰富，低成本，生物相容性和天然容器结构而在绿色电子，生物设备，生物能源和能量存储领域吸引了越来越多的科学兴趣。但是，尚未有效地探索其在环境监测重要领域中的潜在应用。在这项工作中，已经构建了包裹在多孔木材中的金纳米颗粒（NPs）（表示为[电子邮件保护]），用于对水溶液中的Hg ²⁺进行高效比色检测。该检测机制基于Hg ²⁺触发的亚甲基蓝（MB）还原辅助信号放大。在这种检测系统中，Au NP可用作结合Hg ²⁺的特定识别元素由于形成了汞齐，引发了金的催化活性。引入低成本天然木材以防止Au NPs聚集并增加三维空间中MB和Au NPs之间的接触面积。MB作为示踪剂分子，可使输出信号直接用肉眼观察。这种检测系统对Hg ^2+的检测极限为32 pM ，大大低于饮用水和其他比色法的阈值水平（10 nM）。拟议的检测系统还具有对其他金属离子的高选择性，并且对环境水和血液样品也能很好地起作用。所得的[受电子邮件保护的]传感器成本低，易于操作且方便，使其成为用于Hg的使用点监测的有吸引力的材料环境和生物样品中的²⁺。