DETERMINATION OF QUALITY AND SPOILAGE OF MILK BY SYNTHESIZED POLYPYRROLE–AG NANOCOMPOSITE FIBER AT ROOM TEMPERATURE

摘要

Conducting polypyrrole/silver (PPy–Ag) nanocomposite was synthesized by diprncoating polymerization of pyrrole in the presence of silver nitrate as precursor andrnFeCl3 as oxidant on the polyester fibers at room temperature. Nanocomposite wasrncharacterized by Fourier transform infrared spectroscopy and scanning electronrnmicroscopy (SEM) to study the effect of silver nanoparticles embedded into PPyrnon the morphology, structure and conductivity of the conducting polypyrrole.rnThe SEM results show that the morphology of the PPy–Ag powder is of cabbagernshape and porous, and PPy–Ag on the fiber surface is uniformly seeded andrnpacked. The PPy–Ag fiber was used as a pH sensor in liquid phase for milk spoilagerninvestigation. The PPy–Ag fiber used was a simple, low cost and reversiblernsensor for determination of water and milk pH from 3 to 7, so we can determinernspoilage of milk by this sensor. Three same PPy–Ag sensors in different days werernstudied and relation standard deviation <5 was obtained.