基于碳点/分子印迹溶胶-凝胶传感膜的有机酸气体传感阵列的研究

Body odor recognition and detection could reflect lots of useful information, including health condition, hereditary feature, age etc. In this work, we select four kinds of typical organic acid gas, including acetic acid, hexanoic acid, isovaleric acid, and octanic acid in sweat as the detection objects. Choosing the response speed, sensitivity, selectivity, and stability as measurement standard, a gas sensing array based on the sensing unit consist of carbon dots, fluorescent dye, and molecularly imprinted sol-gel will be designed. First, in order to improve the response speed and sensitivity, a gas detection method based on ratio fluorescence would be established using carbon dots with red fluorescence and fluorescence dye with green fluorescence. Organic acid gases will quench the fluorescence of fluorescence dye, and color of fluorescence would change from yellow-green to red, which guarantee the detection rapidity and sensitivity. Second, through applying molecularly imprinting technique to sol-gel material with excellent rigidity, selectivity and chemical and thermal stability could be satisfied. Finally, the development of sensing array based on carbon dots/molecularly imprinted sol-gel film could realize gas response characteristics extraction, optimum gas recognition and detection. Through this project implementation, we would established a new strategy for organic acid gas recognition and detection not only at the basic research level, but also developed new sensing technology for the recognition and detection of many kinds of mixed gases in practical application field.

身体气味的识别与检测能够反映人体的健康状况、遗传特征、年龄等大量有用信息。本项目选择汗液中典型的四种有机酸气体乙酸、己酸、异戊酸及辛酸为检测对象，以响应速度、灵敏度、选择性及稳定性为衡量标准，开发基于碳点、荧光染料及分子印迹溶胶-凝胶传感单元的气体传感阵列。首先，构建基于红色荧光碳点和绿色荧光染料的比例荧光气体检测体系，通过有机酸气体猝灭染料的荧光，荧光颜色可实现从黄绿色变为红色，确保了检测的快速性及灵敏度。其次，通过将分子印迹技术应用于具有良好刚性、化学及热稳定性的溶胶-凝胶材料，可满足检测在选择性和稳定性方面的要求。最终，开发基于碳点/分子印迹溶胶-凝胶传感膜的传感阵列，提取气体的阵列响应特征，可更好地实现对混合气体中目标有机酸气体的识别与检测。通过本项目的实施，不仅在研究基础层面确立了有机酸气体识别及检测的新策略，而且面向实用化开发出可应用于对多种混合气体识别与检测的新型传感技术。

身体气味的识别与检测能够反映人体的健康状况、遗传特征、年龄等大量有用信息。本项目选择汗液中典型的四种有机酸气体乙酸、己酸、异戊酸及辛酸为检测对象，以响应速度、灵敏度、选择性及稳定性为衡量标准，开发基于碳点、荧光染料及分子印迹溶胶-凝胶传感单元的气体传感阵列。首先，构建基于红色荧光碳点和绿色荧光染料的比例荧光气体检测体系，通过有机酸气体猝灭染料的荧光，荧光颜色可实现从黄绿色变为红色，确保了检测的快速性及灵敏度。其次，通过将分子印迹技术应用于具有良好刚性、化学及热稳定性的溶胶-凝胶材料，可满足检测在选择性和稳定性方面的要求。最终，开发基于碳点/分子印迹溶胶-凝胶传感膜的传感阵列，提取气体的阵列响应特征，可更好地实现对混合气体中目标有机酸气体的识别与检测。通过本项目的实施，不仅在研究基础层面确立了有机酸气体识别及检测的新策略，而且面向实用化开发出可应用于对多种混合气体识别与检测的新型传感技术。