ABSTRACT Sugar is one of the important content within food. The classic sugar determination method is precise but needs fuzzy operation, which indicating the high cost. With the rapid development of functional materials in the past decades, a glucose sensor with small size is supposed utilizing the popular nano-sized materials. In this paper, glucose quantitative detecting system was proposed using graphene oxide (GO) modified foam nickel electrode, Pt electrode, and Ag/AgCl electrode. Na2CO3, NaOH, and NH3 in different concentrations were utilized to explore the optimized basic solution. Cyclic voltammetry (CV) and current-time (i-t) scanning were accepted to study the linear relationship between glucose concentration and current density. Results demonstrated that the optimized basic solution content was an equal volume of Na2CO3 and NaOH according to sensor’s sensitivity and responding current density. However, the responding sensitivity of optimized basic solution became weaker than pure NaOH basic solution. In order to increase chemical sensitivity of the electrode, GO was used to modify foam nickel electrode. Results indicated that the responding current was effectively increased. The responses presented good linear relationship with glucose concentration (I = 0.226 c + 0.8289, R2 = 0.9998). The detecting limit was 13.3 μmol/L. The presence of GO in foam nickel structure tremendously increased the detecting sensitivity. The decrease of NaOH volume in basic solution proposed a green way for this technique in sugar rapid analysis, glucose analysis in blood.

中文翻译：

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使用氧化石墨烯改性泡沫镍电极和优化的碱性溶液快速检测葡萄糖

摘要 糖是食品中的重要成分之一。经典的糖分测定方法精确但需要模糊运算，成本高。随着功能材料在过去几十年的快速发展，小尺寸的葡萄糖传感器被认为是利用流行的纳米材料。本文提出了使用氧化石墨烯（GO）改性泡沫镍电极、Pt电极和Ag/AgCl电极的葡萄糖定量检测系统。利用不同浓度的 Na2CO3、NaOH 和 NH3 来探索优化的碱性溶液。接受循环伏安法 (CV) 和电流-时间 (it) 扫描来研究葡萄糖浓度和电流密度之间的线性关系。结果表明，根据传感器的灵敏度和响应电流密度，优化的碱性溶液含量为等体积的Na2CO3和NaOH。然而，优化后的碱性溶液的响应灵敏度比纯NaOH碱性溶液弱。为了提高电极的化学敏感性，使用GO对泡沫镍电极进行改性。结果表明响应电流有效增加。响应与葡萄糖浓度呈良好的线性关系（I = 0.226 c + 0.8289，R2 = 0.9998）。检出限为13.3 μmol/L。泡沫镍结构中GO的存在极大地提高了检测灵敏度。碱性溶液中NaOH体积的减少为该技术在血糖快速分析、血液中的葡萄糖分析中提供了一条绿色途径。