Theodoro Reinaldo Dos Santos, Sanghikian Marques Dos Santos Gustavo, Soares de Sá Bruna, Perfecto Tarcísio Micheli, Volanti Diogo Paschoalini
Laboratory of Materials for Sustainability (LabMatSus), São Paulo State University (UNESP), Rua Cristóvão Colombo 2265, São José do Rio Preto 15054-000, Brazil.
Brazilian Agricultural Research Corporation (EMBRAPA), São Carlos SP 13560-970, Brazil.
ACS Appl Mater Interfaces. 2024 Oct 5;16(41):55637-49. doi: 10.1021/acsami.4c09428.
-Xylene is a volatile organic compound that is extensively used in various industrial processes. It is toxic, posing significant risks to human health and the environment. Therefore, developing gas sensors with high sensitivity and selectivity for -xylene detection is critical. In this work, we demonstrated the synthesis of NiO-yolk double-shell (NiO-YDS) and NiO-yolk triple-shell (NiO-YTS) derived from NiO/Ni-BTC and NiO/Ni-PTA composites, respectively, using the microwave-assisted solvothermal method from Ni-BTC-derived NiO spheres. The NiO/Ni-BTC composite has trimesic acid (HBTC) as an organic linker, while NiO/Ni-PTA has -terephthalic acid (PTA). We investigated the sensing properties of these materials for 2-butanone, 2-nonanone, 3-methyl-1-butanol, acetone, benzene, ethanol, methanol, and -xylene. These composites exhibited excellent sensitivity and selectivity for detecting -xylene under dry conditions. Specifically, the NiO-YTS sensor showed a sensitivity of 217.5% to -xylene, while the NiO-YDS sensor demonstrated a sensitivity of 179.8% at 350 °C in dry air. We emphasize the NiO-YTS composite due to its superior sensitivity and selectivity in detecting -xylene compared with the NiO-YDS composite. The NiO-YTS sensor exhibited stable and reproducible sensing performance for 100 ppm of -xylene under optimum working conditions, with a theoretical detection limit of 5.43 ppb and relatively fast response time (89 s) and recovery time (191 s). This work describes an easy method for synthesizing NiO-YDS and NiO-YTS derived from NiO/Ni-BTC and NiO/Ni-PTA composites. It demonstrates that these composites represent a new class of materials that can potentially enhance the sensitivity and selectivity of -xylene gas sensors.
二甲苯是一种挥发性有机化合物，广泛应用于各种工业过程中。它具有毒性，对人类健康和环境构成重大风险。因此，开发对二甲苯检测具有高灵敏度和选择性的气体传感器至关重要。在这项工作中，我们展示了分别从由NiO/Ni-BTC和NiO/Ni-PTA复合材料衍生而来的NiO-蛋黄双壳（NiO-YDS）和NiO-蛋黄三壳（NiO-YTS）的合成，采用微波辅助溶剂热法从Ni-BTC衍生的NiO球体合成。NiO/Ni-BTC复合材料以均苯三甲酸（HBTC）作为有机连接体，而NiO/Ni-PTA以对苯二甲酸（PTA）作为有机连接体。我们研究了这些材料对2-丁酮、2-壬酮、3-甲基-1-丁醇、丙酮、苯、乙醇、甲醇和二甲苯的传感性能。这些复合材料在干燥条件下对检测二甲苯表现出优异的灵敏度和选择性。具体而言，NiO-YTS传感器对二甲苯的灵敏度为217.5%，而NiO-YDS传感器在350℃的干燥空气中灵敏度为179.8%。与NiO-YDS复合材料相比，我们强调NiO-YTS复合材料在检测二甲苯方面具有卓越的灵敏度和选择性。在最佳工作条件下，NiO-YTS传感器对100 ppm的二甲苯表现出稳定且可重复的传感性能，理论检测限为5.43 ppb，响应时间相对较快（89 s）和恢复时间（191 s）。这项工作描述了一种从NiO/Ni-BTC和NiO/Ni-PTA复合材料合成NiO-YDS和NiO-YTS的简便方法。它表明这些复合材料代表了一类新型材料，有可能提高二甲苯气体传感器的灵敏度和选择性。
