Abstract Amorphous lead metaborate (Pb(BO2)2 H2O) nanostructures were synthesized by a simpl and cost-effective synthesis method which is based on precipitation of lead ions using boric acid/sodium hydroxide buffer (pH 9.2) in the presence of polyethylene glycol (PEG). Scanning electron microscopy images showed that the average particle size is 30±9 nm and the particle shape is mostly spherical. The chemical formulation of Pb(BO2)2 H2O was confirmed by infrared spectroscopy, inductively coupled plasma and thermal gravimetric analysis (TGA). The percentage of PEG molecules on the particle surface equal to 2.5 % was determined by TGA. Optical reflectance measurement was performed by UV-Vis spectroscopy. Based on the Kubelka-Munk function, it was calculated that the Pb(BO2)2 H2O nanostructures have a direct band gap of 4.6 eV.

中文翻译：

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偏硼酸铅 (Pb(BO2)2 H2O) 纳米结构的缓冲沉淀法的开发

摘要 无定形偏硼酸铅 (Pb(BO2)2 H2O) 纳米结构是通过一种简单且具有成本效益的合成方法合成的，该合成方法基于在聚乙二醇存在下使用硼酸/氢氧化钠缓冲液（pH 9.2）沉淀铅离子（聚乙二醇）。扫描电镜图像显示平均粒径为30±9 nm，颗粒形状多为球形。通过红外光谱、电感耦合等离子体和热重分析 (TGA) 证实了 Pb(BO2)2 H2O 的化学成分。通过 TGA 确定颗粒表面上 PEG 分子的百分比等于 2.5%。通过紫外-可见光谱法进行光学反射率测量。基于 Kubelka-Munk 函数，计算出 Pb(BO2)2 H2O 纳米结构的直接带隙为 4.6 eV。