Abstract

Black phosphorus nanosheets (BPNS) were synthesized through liquid exfoliation method coupling with ultrasonication. The synthesized BPNS were characterized by transmission electron microscopy, size-distribution analysis, and Raman spectroscopy. The results revealed that few layers BP nanosheets with an average lateral size of 240 nm were obtained. BPNS modified glassy carbon electrode (BPNS/GCE) was fabricated, and used to study the electrochemical reaction of ascorbic acid (AA). The oxidation current of AA increased nearly 6-times and the oxidation potential was negatively shifted compared with the bare GCE, which should be result from the large surface area and good charge transfer ability of BPNS film. Several impacting factors including the amount of modified BPNS, the pH value, and the potential scan rate, were investigated. Under the optimal condition, differential pulse voltammetry was used to detect AA in the range of 1–35 nM with a detection limit of 0.3 nM. The obtained results revealed the potential electrochemical sensing application of BP nanomaterials, which should promote the further analytical application of two-dimensional nanomaterials.

中文翻译：

---

黑色磷纳米片修饰电极在抗坏血酸电化学测定中的应用

摘要

通过液体剥离法和超声处理合成了黑磷纳米片（BPNS）。合成的BPNS通过透射电子显微镜，尺寸分布分析和拉曼光谱进行了表征。结果表明，获得了几层平均横向尺寸为240 nm的BP纳米片。制备了BPNS修饰的玻碳电极（BPNS / GCE），用于研究抗坏血酸（AA）的电化学反应。与裸露的GCE相比，AA的氧化电流增加了近6倍，氧化电势负移，这可能是由于BPNS膜的表面积大和电荷转移能力好所致。研究了几个影响因素，包括修饰的BPNS的量，pH值和电势扫描速率。在最佳条件下，差分脉冲伏安法用于检测1–35 nM范围内的AA，检测极限为0.3 nM。所得结果揭示了BP纳米材料的潜在电化学传感应用，应促进二维纳米材料的进一步分析应用。