Zirconium 1,4-butylenediphosphonate[Zr(BDPA)]muhilayers on a 3-mercaptopropylphosphonate-coated gold electrode were prepared by the conventional layer-by-layer method.The stability of the Zr(BDPA)multilayers in different supporting electrolyte solutions was studied by cyclic vohammetry(CV)and X-ray photoelectron spectroscopy(XPS)measurements.The results show that the Zr(BDPA)muhilayers are very stable in 0.2 mol·L-1 KCI,0.2 mol·L-1 KNO3 and low concentration phosphate buffer solution(PBS)with low pH values(c≤0.05 mol·L-1,pH≤6.8).While in high concentration 0.2 mol·L-1 PBS(pH=5.2～7.4),the Zr(BDPA)multilayers will be partially desorbed within two days,possibly due to the formation of more stable zirconium phosphate.
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