Arsenic(III) is a highly toxic pollutant in the environment, and the development of nanomaterials with high electrochemical activity for As(III) detection is a research focus at present. Herein, an electrochemical sensing platform based on polyaniline nanofibers embedded with Ag@SiO₂ nanoparticles (Ag@SiO₂/PANI NFs) was successfully constructed for trace As(III) determination. Owing to an in-situ chemical oxidation polymerization strategy, the polyaniline nanofibers loaded with Ag@SiO₂ core-shell nanoparticles blossomed into the dendritic three-dimensional network. The unique structure with a huge specific surface area greatly enhanced the adsorption efficiency of As(III). Combined with the outstanding conductivity of polyaniline and the electrocatalytic ability of uniformly dispersed AgNPs, the stripping current signal of As(III) was further amplified. Based on the optimized conditions, the sensitivity of 0.83 μA μg⁻¹ L was obtained in the linear range of 0.1 ~ 100 μg L⁻¹ with a low detection limit of 0.013 μg L⁻¹. And the selectivity, reproducibility, and long-term stability of this sensor were excellent. Additionally, satisfactory results were achieved by the recovery experiment of real samples, and the accuracy of this method was verified by comparison with ICP-MS. The above results demonstrated the promising application of the as-fabricated sensor in As(III) detection.

砷(III)是环境中的剧毒污染物，开发用于As(III)检测的高电化学活性纳米材料是目前的研究热点。_{在此，成功构建了基于嵌入Ag@SiO 2}纳米颗粒（Ag@SiO ₂ /PANI NFs）的聚苯胺纳米纤维的电化学传感平台，用于痕量As（III）的测定。由于原位化学氧化聚合策略，负载Ag@SiO _{2的聚苯胺纳米纤维}核壳纳米粒子开花成树枝状三维网络。具有巨大比表面积的独特结构大大提高了As(III)的吸附效率。结合聚苯胺优异的导电性和均匀分散的AgNPs的电催化能力，进一步放大了As(III)的溶出电流信号。基于优化的条件，在0.1~100 μg L ^-1的线性范围内获得了0.83 μA μg ^-1 L的灵敏度，低检出限为0.013 μg L ^-1. 该传感器的选择性、重现性和长期稳定性都非常出色。此外，真实样品的回收率实验也取得了令人满意的结果，并通过与ICP-MS的对比验证了该方法的准确性。上述结果证明了所制造的传感器在 As(III) 检测中的应用前景。