为改善石墨烯导电油墨的导电性及其电催化性能，在含有Ag⁺和氧化石墨（GO）的溶液中加入一定量的还原试剂（硼氢化钠），在获得还原石墨烯（RGO）的同时在其表面生成纳米Ag颗粒，制得的载银石墨烯（Ag-RGO）具有良好的水溶性；以羧甲基纤维素钠为粘结剂，可得到稳定的水溶性油墨。将油墨打印在聚酰亚胺（PI）薄膜基底上，在N₂气氛中于350℃热处理2 h，其电导率达到5.2×10³ S/m。打印电极的电流密度在N₂饱和的0.2 mol/L PBS （pH=7.4）中与H₂O₂的浓度成线性关系（线性范围0.3~3.5 mmol/L）；在未除氧的0.1 mol/L NaOH电解液中与葡萄糖的浓度成线性关系（线性范围0.04~0.2 mmol/L），均表现出高的灵敏度。

To improve the conductivity and electrocatalytic performance of graphene conductive ink, NaBH₄ is used as a reducing agent to simultaneously reduce Ag⁺ and graphite oxide (GO) to obtain silver-loading graphene (Ag-RGO).The obtained Ag-RGO has a good water solubility.Using Ag-RGO as conductive phase, and sodium carboxymethyl cellulose as binder, a stable water-soluble conductive ink is obtained.The conductive ink is printed on a polyimide film as an electrode that gains a conductivity of 5.2×10³ S·m^-1 after heating at 350℃ for 2 hours in N₂ atmosphere.The printed electrode shows high sensitivity for both of H₂O₂ and glucose.The current density is linearly related to the concentration of H₂O₂ in N₂ saturated 0.2 M PBS (pH=7.4) solution with a linear range of 0.3-3.5 mM, and the concentration of glucose in 0.1 M NaOH without deoxygenation, with a linear range of 0.04-0.2 mM.

杨冬静(1988-),女,硕士,助理工程师,研究方向为生物医学传感器和医用电子电路,yangdongjing@seu.edu.cn。