不同晶型MnO_2纳米线的催化荧光传感研究  

Fluorescence sensing of formaldehyde based on the catalytic reaction of MnO_2 nanowires modulated by different crystal structures

作　　者：吴振龙 邬佳佳 孙向英[1] 刘斌[1] 沈江珊[1] Zhenlong Wu Jiajia Wu Xiangying Sun Bin Liu Jiangshan Shen(College of Materials Science and Engineering, Huaqiao University, Xiamen 361021, China)

机构地区：[1]华侨大学材料科学与工程学院,厦门361021

出　　处：《中国科学：化学》2017年第10期1226-1232,共7页SCIENTIA SINICA Chimica

基　　金：国家自然科学基金(编号:21275059;21377124;21575044);福建省自然科学基金(编号:2015J01054;2016J01062;2017J01015);华侨大学中青年教师科技创新资助计划项目(编号:ZQN-YX303);华侨大学人才引进科研启动项目(编号:15BS202)

摘　　要：采用水热合成法,制备了4种不同晶型(α、β、γ、δ)的MnO_2纳米线.以邻苯二胺(OPD)为底物分子,系统地研究了不同晶型MnO_2纳米线的催化生荧反应.采用透射电子显微镜(TEM)、扫描电子显微镜(SEM)、X射线粉末衍射(XRD)、光电子能谱(XPS)、核磁共振、质谱和电化学方法等实验手段进行表征研究.实验结果表明,β-MnO_2纳米线对OPD的催化生荧反应为最佳.在此研究的基础上,借助甲醛的.CHO基团和OPD的.NH_2基团可发生缩合反应形成Schiff碱的性质,进一步构建了一种新型、高选择性、灵敏的催化荧光传感体系,并用于食品中甲醛的检测研究.α-, β-, γ-, δ-MnO_2 nanowires with different crystal structures were synthesized by a hydrothermal method.Employing o-phenylenediamine（OPD） as the substrate, the fluorogenic reactions catalyzed by these MnO_2 nanowires were detailedly studied. Transmission electron microscopy（TEM）, scanning electron microscopy（SEM）, X-ray diffraction（XRD）, X-ray photoelectron spectroscopy（XPS）, nuclear magnetic resonance（NMR）, mass spectrometry and electrochemical methods were employed to probe the catalytic fluorogenic reaction. Experimental results revealed that, the activity of the catalytic fluorogenic reaction of β-MnO_2 nanowires towards OPD was best, compared with that of other MnO_2 nanowires with different crystal structures. On the basis of these findings, taken together the condensation reaction forming the Schiff base between the –CHO group of formaldehyde and –NH2 group of OPD, a novel, highly selective and sensitive catalytic fluorogenic sensing system was successfully established and employed for detecting formaldehyde in foods.

关 键 词：MnO2纳米线 催化生荧反应 荧光传感 甲醛检测 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TP212[自动化与计算机技术—检测技术与自动化装置]