CdSe flower-like nanorods (NRs) were successfully synthesized by Sol–gel technique where a simple aqueous technique was applied. The effects of different selenium (Se) concentration in the precursor solution on the material properties were studied. The X-ray diffraction (XRD) analyses show that a cubic zinc blende crystal structure was formed. Variation in the crystallite sizes were observed for different amounts of Se used in the precursor. The sizes estimated from various techniques were in the range 3–5 nm. The XRD peak intensity reached an optimum when 8 mL of 0.5 M of reduced selenium was used. The surface topography obtained from the scanning electron microscope showed densely packed and uniformly distributed flower-like rod/blade-like shaped CdSe NRs. The Fourier transform infrared spectrophotometer gave the stretching vibrations of the CdSe NRs with some bands belonging to the capping agent and the solvent. Thermal analysis conducted portrayed the 8 mL sample to be more stable than other samples at various temperatures. The photoluminescence (PL) studies displayed a red shift in the emission peaks (550–575 nm) as the selenium concentration was increased from 4 to 12 mL. This was then followed by an increase in the PL peak intensity which reached a maximum at 8 mL of Se used during the synthesis. The band gap energies calculated from the absorption spectra decreased from 3.27 to 2.79 eV with an increase in the Se concentration. The percentage transmittance of CdSe NRs varied with different amounts of Se in the precursor solution.

中文翻译：

---

前驱体溶液中硒浓度对硒化镉花状纳米粒子材料性能的影响

通过溶胶-凝胶技术成功合成了 CdSe 花状纳米棒 (NRs)，其中应用了简单的水性技术。研究了前体溶液中不同硒 (Se) 浓度对材料性能的影响。X射线衍射(XRD)分析表明形成了立方闪锌矿晶体结构。对于在前体中使用的不同量的硒，观察到微晶尺寸的变化。通过各种技术估计的尺寸在 3-5 nm 范围内。当使用 8 mL 的 0.5 M 还原硒时，XRD 峰强度达到最佳。从扫描电子显微镜获得的表面形貌显示密集且均匀分布的花状棒/叶片状 CdSe NRs。傅里叶变换红外分光光度计给出了 CdSe NRs 的伸缩振动，其中一些谱带属于封端剂和溶剂。进行的热分析表明 8 mL 样品在各种温度下比其他样品更稳定。随着硒浓度从 4 毫升增加到 12 毫升，光致发光 (PL) 研究显示发射峰 (550–575 nm) 发生红移。随后 PL 峰强度增加，在合成过程中使用 8 mL Se 时达到最大值。随着 Se 浓度的增加，根据吸收光谱计算的带隙能量从 3.27 eV 降低到 2.79 eV。CdSe NRs 的百分比透射率随前体溶液中硒含量的不同而变化。