Preparation and Investigation of NO Sensor Modified by Sodalite Zeolite

A novel nitric oxide(NO) sensor of GCE/NiTSPc/Nafion/(PDDA/Zeolite)5 was prepared by electrodepositing nickel tetrasulfonated phthalocyanine(NiTSPc) and dipping Nafion 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 Nafion 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.