We describe a facile method to synthesize a new type of catalyst by electrodepositing Ag nanocrystals (AgNCs) on the different polymer dyes, Poly (methylene blue) (PMB) or Poly (4-(2-Pyridylazo)-Resorcinol) (PAR) modified graphene‑carbon spheres (GS) hybrids. The self-assembled GS take dual advantages of carbon spheres and graphene. Carbon spheres acts as nano-spacers prevent the aggregation of graphene and guarantee the fast electron transfer of GS. Secondly, polymerized dyes used here are beneficial for AgNCs growing as a linker. The effects of dyes on the growth habits, morphologies and catalytic properties for AgNCs were investigated. A novel electrochemical nonenzymatic sensor for hydrogen peroxide (H₂O₂) detection is fabricated based on the Ag/Polymer dyes/GS ternary composites modified glass carbon electrode (GCE) for the first time. It was found that the proposed electrodes, especially for Ag/PMB/GS/GCE, displayed a peculiar electrocatalytic activity towards H₂O₂ reduction synergistically as compared to Ag/PAR/GS/GCE or Ag/GS/GCE alone. Ag/PMB/GS/GCE showed a linear response over the H₂O₂ concentration range of 0.5 to 1112 μM. The detection limit and sensitivity is 0.15 μM and 400 μA mM⁻¹ cm⁻², respectively. These outstanding results enable the practical application of Ag/PMB/GS/GCE for the H₂O₂ tracking released from MCF-7 (human breast cancer cells) with satisfactory results.

我们描述了一种通过在不同的聚合物染料，聚（亚甲基蓝）（PMB）或聚（4-（2-吡啶基偶氮）-间苯二酚）（PAR）修饰的电沉积银纳米晶体（AgNCs）来合成新型催化剂的简便方法石墨烯-碳球（GS）杂化物。自组装GS具有碳球和石墨烯的双重优势。碳球充当纳米间隔物，可防止石墨烯聚集并确保GS的快速电子转移。其次，此处使用的聚合染料对于AgNC作为连接子的生长是有益的。研究了染料对AgNCs的生长习性，形态和催化性能的影响。一种用于过氧化氢（H ₂ O _2）的新型电化学非酶传感器）首次基于Ag /聚合物染料/ GS三元复合材料修饰的玻璃碳电极（GCE）进行检测。发现所提出的电极，特别是对于Ag / PMB / GS / GCE，与单独的Ag / PAR / GS / GCE或Ag / GS / GCE相比，对H ₂ O ₂还原显示出独特的电催化活性。Ag / PMB / GS / GCE在0.5至1112μM的H ₂ O ₂浓度范围内显示线性响应。检测极限和灵敏度分别为0.15μM和400μAmM ^-1  cm ^-2。这些出色的结果使Ag / PMB / GS / GCE可以实际用于H ₂ O ₂ 跟踪从MCF-7（人乳腺癌细胞）释放的结果令人满意。