Bi2O2Se纳米片的可控合成及光电性能研究

Controllable Synthesis and Photoelectric Properties of Bi2O2Se Nanosheets

摘要:

采用熔盐法,以五水硝酸铋为铋源、硒粉为硒源、水合肼作为还原剂,在不同NaOH浓度下(0~3mol/L)合成了Bi₂O₂Se纳米片,并采用XRD,SEM,TEM以及XPS等对样品的形貌、结构和成分进行了表征。然后,以Bi₂O₂Se为工作电极制备了宽光谱自供能探测器,并探究了它们的光电探测性能。测试结果表明,在1.1mol/L NaOH的条件下,Bi₂O₂Se自供能探测器的光电探测性能最优,在紫外-可见-红外波段具有较高的响应度。在365nm紫外光照射下,光电流最高可以达到7.8μA,其上升和下降时间分别为30和21ms。同时,通过计算得到其响应度和探测率分别为4.2×10-4A/W和1.02×10⁹Jones。

Abstract:

Bi₂O₂Se nanosheets were synthesized by molten salt method by using Bismuth nitrate pentahydrate as bismuth source, selenium powder as selenium source and hydrazine hydrate as reducing agent at different concentrations of NaOH (0~3mol/L). The morphology, structure and composition of the samples were characterized by XRD, SEM, TEM and XPS. Then, a wide spectrum self-powered detector was prepared by using Bi₂O₂Se as the working electrode, and their photoelectric detection performance was investigated. The test results show that the Bi₂O₂Se self-powered detector has the best photoelectric detection performance under the condition of 1.1mol/L NaOH. In the UV-Vis-IR band, it has a high response. Under 365nm UV light, the photocurrent can reach 7.8μA, and the rise and fall time are 30 and 21ms, respectively. The responsivity and detectivity are 4.2×10-4A/W and 1.02×10⁹Jones, respectively.