Department of Chemistry, Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, iChEM and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, PR China.
Department of Chemistry, Laboratory of Advanced Materials, Shanghai Key Lab of Molecular Catalysis and Innovative Materials, iChEM and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, PR China.
J Colloid Interface Sci. 2016 Sep 1;477:54-63. doi: 10.1016/j.jcis.2016.05.040. Epub 2016 May 21.
Indoor organic gaseous pollution is a global health problem, which seriously threats the health and life of human all over the world. Hence, it is important to fabricate new sensing materials with high sensitivity and efficiency for indoor volatile organic compounds. In this study, a series of ordered mesoporous silica-based nanocomposites with uniform carbon coatings on the internal surface of silica mesopore channels were synthesized through a simple template-carbonization strategy. The obtained mesoporous silica-carbon nanocomposites not only possess ordered mesostructures, high surface areas (up to ∼759m(2)g(-1)), large and tunable pore sizes (2.6-10.2nm), but also have the improved hydrophobicity and anti-interference capability to environmental humidity. The sensing performances of the mesoporous silica-carbon nanocomposites to volatile organic compounds, such as ethylbenzene, methylbenzene, benzene, methanol, acetone, formaldehyde, dichloromethane and tetrahydrofuran, were systematically investigated. The relationships between the sensing performances and their properties, including mesostructures, surface areas, pore sizes, carbon contents and surface hydrophilic/hydrophobic interactions, have been achieved. The mesoporous silica-carbon nanocomposites with hexagonal mesostructure exhibit outstanding performance at room temperature to benzene and acetone with high responses, short response (2-3s) and recovery (16-19s) time, strong anti-interference to environmental humidity, and long-term stability (less than ∼5% loss of the frequency shifts after 42days). Therefore, the obtained mesoporous silica-carbon nanocomposites have a hopeful prospect in the field of environmental air quality monitoring.
室内有机气态污染物是一个全球性的健康问题，严重威胁着全世界人类的健康和生命。因此，制备对室内挥发性有机化合物具有高灵敏度和高效率的新型传感材料非常重要。在这项研究中，通过简单的模板碳化策略，合成了一系列具有均匀碳涂层的有序介孔硅基纳米复合材料，其内部的硅介孔通道。所得的介孔硅-碳纳米复合材料不仅具有有序介孔结构、高比表面积（高达约 759m2g-1）、大且可调的孔径（2.6-10.2nm），而且具有改善的疏水性和对环境湿度的抗干扰能力。系统研究了介孔硅-碳纳米复合材料对挥发性有机化合物（如乙苯、甲苯、苯、甲醇、丙酮、甲醛、二氯甲烷和四氢呋喃）的传感性能。研究了传感性能与其性质之间的关系，包括介孔结构、比表面积、孔径、碳含量和表面亲水性/疏水性相互作用。具有六方介孔结构的介孔硅-碳纳米复合材料在室温下对苯和丙酮表现出优异的性能，具有高响应、短响应（2-3s）和恢复（16-19s）时间、对环境湿度的强抗干扰性和长期稳定性（42 天后频率偏移小于约 5%）。因此，所得的介孔硅-碳纳米复合材料在环境空气质量监测领域具有广阔的前景。
