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采用水热还原氧化法合成了高度分散的具有纳米纤维结构的钾矿型二氧化锰,并将其用来制作检测双氧水浓度的传感器.运用X射线衍射(XRD)仪、电子扫描显微镜(SEM)、透射电子显微镜(TEM)和比表面积(BET)及孔隙度分析仪观察和表征二氧化锰纳米纤维的结构和表面形貌;用电化学工作站(EW)检测其传感性能.结果表明:在pH为7.4的磷酸缓冲溶液中,开路电压为0.2V的条件下对0.1%(w,质量分数)的二氧化锰纳米纤维修饰的玻碳电极(GCE)进行测试,测试结果为随着双氧水的浓度每增加0.1mmo·lL-1,响应电流的峰值就增加约1.3μA,在双氧水的浓度在0.1-1.5mmo·lL-1范围内得到的线性相关系数为0.996,这种电极的高灵敏度和优异的电化学活性可能归因于钾矿型二氧化锰纳米纤维的特殊纳米结构.这种传感器有很高的灵敏度和很好的重现性.综上说明这种廉价并且有很好的电化学活性的材料为设计新型电极生物传感器提供了更大可能.
Potassium manganese dioxide with nanofibers structure was synthesized by hydrothermal reduction method and was used to fabricate a sensor for detecting the concentration of hydrogen peroxide.Using X-ray diffraction (XRD) and scanning electron microscopy (SEM) , Transmission electron microscopy (TEM), specific surface area (BET) and porosity analyzer were used to observe and characterize the structure and surface morphology of MnO2 nanofibers.Electrochemical workstation (EW) A 0.1% (w, mass fraction) manganese dioxide nanofiber modified glassy carbon electrode (GCE) was tested in a phosphate buffer solution with a pH value of 7.4 under the open circuit voltage of 0.2V. The test results showed that with hydrogen peroxide The peak value of response current increased by about 1.3μA for each 0.1 mmol · L-1 concentration increase, and the linear correlation coefficient was 0.996 when the concentration of hydrogen peroxide was 0.1-1.5 mmol · L-1. The high sensitivity of this electrode The excellent electrochemical activity may be attributed to the special nanostructures of potash-type manganese dioxide nanofibers, which have high sensitivity and good reproducibility.To sum it up, this low-cost and very good electricity Chemically active material is Biosensor meter novel electrode provides greater possibility.