用分子筛修饰制备的NO传感器的电化学性能研究

Preparation and Investigation of NO Sensor Modified by Sodalite Zeolite

采用层层组装方法(LBL),将纳米方钠石分子筛进一步修饰到经镍(Ⅱ)四磺酸基酞菁(NiTSPc)和全氟磺酸离子交联聚合物(Nafion)修饰的玻碳电极(GCE/NiTSPc/Nafion)表面上,制得一新型NO传感器GCE/NiTSPc/Nafion/(PDDA/Zeolite)5(PDDA即聚二甲基二烯丙基氯化铵),并对其电化学性能进行了研究。结果表明,纳米方钠石分子筛修饰膜不仅可提高电极检测NO的灵敏度(由26 mA/(mol.L-1)升至29 mA/(mol.L-1)),还可提高电极抵抗共存物干扰的能力。Nafion修饰层可使电极对抗坏血酸、多巴胺、肾上腺素及亚硝酸钾的响应分别降低19%、0%、11%、33%,而进一步修饰纳米方钠石分子筛后,电极对上述干扰物质的响应分别降低了68%、51%、52%和39%。

A novel nitric oxide （NO） sensor of GCE/NiTSPc/Nafion/（PDDA/Zeolite） 5 was prepared by electrodepositing nickel tetrasulfonated phthalocyanine （NiTSPc） and dipping Nation on glass carbon electrode（GCE） , then further assembling nano-sized sodalite zeolite with layer-by-layer assembly technique. Its electrochemical performances toward NO and some interference such as ascorbic acid, dopamine, epinephrine and potassium nitrite were investigated. The results exhibited that, compared with the GCE/NiTSPc/Nafion electrode, the GCE/NiTSPc/Nafion/（PDDA/Zeolite）5 electrode showed high sensitivity for NO detection from 26 to 29 mA/（mol·L^-1 ）. The electrode aslo showed high anti-interference capability. After being modified with sodalite zeolite, the sensor＇s responds to ascorbic acid, dopamine, epinephrine and potassium nitrite decreased by 68% , 51% , 52% and 39% , respectively, while the sensor with Nation membrane only decreased 19% , 0% , 11% and 33% , respectively. Therefore, this novel electrochemical NO sensor provides an inspiring approach for NO real-time and in vivo measurement.