Synthesis And Sensing Propertise Of Polyaniline/inorganic Nanoparticles Composite

As a typical conductive polymer, polyaniline(PANI) has become a focus of research in recent years for its good chemical stability, environmental stability and unique electrochemical properties. Polyaniline / inorganic nanoparticle composite has both properties of polyaniline and inorganic nanoparticles, thus, it can be used as an excellent sensing materials in chemical sensors, such as formaldehyde gas sensors and non-enzymatic glucose biosensor.Currently, formaldehyde gas sensors are mostly based on metals and metal oxides, which has strictly request about temperature. There are few research of polyaniline / inorganic nanoparticle composite. And no research reported about polyaniline / silver nanoparticle composite applied in formaldehyde gas sensor. In this article, we explored a formaldehyde gas sensor based on polyaniline / silver nanoparticle composites.As an important chemical in life, the accurate detection of glucose has great significance in industrial production and medical applications. Compared to traditional glucose sensors, the glucose are oxidized directly on the surface of the electrode of the non-enzymatic glucose biosensor, thus the result is more accurate. There have been reported that cerium oxide is not suitable as non-enzymatic glucose sensor electrode material, but it can accelerate electron transfer as as part of the composite material. Therefore, in this article, we made a non-enzymatic glucose sensor based on polyaniline / cerium oxide nanoparticle composites.Polyaniline/silver nanocomposites have been prepared through a one-step rapid mixing reaction method by using ammonium perfulfate as oxidation agents. The nanocomposites were investigated by scanning electron microscopy(SEM), transmission electron microscope(TEM) and X-ray diffraction(XRD). The results show that: polyaniline prepared by the method is highly doped polyaniline and polyaniline and polyaniline / silver nanoparticle composites have a fibrous structure. Prepae polyaniline / silver nanoparticle composite materials for formaldehyde gas sensor, and gas sensitivity test results showed that: compared to pure polyaniline, polyaniline / silver nanoparticle composite’s resistance has increased, formaldehyde response gas also significantly higher. Gas sensitivity experiments were reproducible, polyaniline / silver nanoparticle composite showed good selectivity towards formaldehyde among other common organic gases such as acetone, benzene, chloroform and hexane.Cerium oxide nanorods(CeO2 NRs) were synthesized without templates through a low cost and simple non-isothermal precipitation method, afterwards, PANI / CeO2 hybrid was prepared by in-situ polymerization process. Based on that, PANI / CeO2 modified carbon paste electrode was made and used as a basis research in the application of non-enzymatic sensor..The structure and morphology of CeO2 NRs and PANI / CeO2 were characterized by SEM and TEM and XRD. The SEM image of the CeO2 NR shows relatively uniform rod-like structures. Because of the synergistic effect between PANI and CeO2, the PANI / CeO2 had a good response to non-enzymatic detecting glucose. The result shows, the biosensor based on PANI / CeO2 has good response to glucose in a linear range of 29.82 μM~ 0.56 mM with sensitivity of 25.79 μA mM-1 cm-2, the detection limit is 0.56 μA. Therefore, the PANI / CeO2 non-enzymatic glucose sensor had a promising application for glucose determination.