A stable suspension of nanopolyaniline (nPANI) particles can be used in various applications instead of a polyaniline film. The electrochemical behavior of a stable suspension of nPANI particles, in strongly acidic conditions of HCl at the gold electrode surface, was investigated using various electrochemical and surface analysis methods. Voltammetry results showed two redox transformations indicating the adsorption and diffusion-controlled mechanism of nPANI particles. Moreover, the decrease in pH causes an increase in the number of electrons transferred per nPANI particles. The adsorption data were fitted by the Langmuir adsorption isotherm and the maximum surface coverage decreases with the increment of pH. The adsorption of nPANI particles was confirmed by the surface analysis methods. Moreover, the quantum chemical calculation and Monte Carlo simulation approved the electrochemical results for the effect of pH on the adsorption of nPANI particles at the gold electrode surface.

纳米聚苯胺（nPANI）颗粒的稳定悬浮液可代替聚苯胺薄膜用于各种应用。使用各种电化学和表面分析方法研究了nPANI颗粒稳定悬浮液在金电极表面HCl的强酸性条件下的电化学行为。伏安法结果显示了两个氧化还原转变，表明了nPANI颗粒的吸附和扩散控制机制。此外，pH的降低会导致每个nPANI颗粒转移的电子数量增加。吸附数据通过Langmuir吸附等温线拟合，并且最大表面覆盖率随pH的增加而减小。通过表面分析方法确认了nPANI颗粒的吸附。此外，