Achimovičová Marcela, Hegedüs Michal, Girman Vladimír, Lisnichuk Maksym, Dutková Erika, Kurimský Juraj, Briančin Jaroslav
Institute of Geotechnics, Slovak Academy of Sciences, 04001 Košice, Slovakia.
Synthon s.r.o., 67801 Blansko, Czech Republic.
Nanomaterials (Basel). 2022 Aug 26;12(17):2952. doi: 10.3390/nano12172952.
Nickel mono- (NiSe) and diselenide (NiSe) were produced from stoichiometric mixtures of powdered Ni and Se precursors by the one-step, undemanding mechanochemical reactions. The process was carried out by high-energy milling for 30 and 120 min in a planetary ball mill. The kinetics of the reactions were documented, and the products were studied in terms of their crystal structure, morphology, electrical, and optical properties. X-ray powder diffraction confirmed that NiSe has hexagonal and NiSe cubic crystal structure with an average crystallite size of 10.5 nm for NiSe and 13.3 nm for NiSe. Their physical properties were characterized by the specific surface area measurements and particle size distribution analysis. Transmission electron microscopy showed that the prepared materials contain nanoparticles of irregular shape, which are agglomerated into clusters of about 1-2 μm in diameter. The first original values of electrical conductivity, resistivity, and sheet resistance of nickel selenides synthesized by milling were measured. The obtained bandgap energy values determined using UV-Vis spectroscopy confirmed their potential use in photovoltaics. Photoluminescence spectroscopy revealed weak luminescence activity of the materials. Such synthesis of nickel selenides can easily be carried out on a large scale by milling in an industrial mill, as was verified earlier for copper selenide synthesis.
通过一步简单的机械化学反应，由粉末状镍和硒前驱体的化学计量混合物制备出了一硒化镍（NiSe）和二硒化镍（NiSe₂）。该过程在行星式球磨机中通过高能球磨30分钟和120分钟来进行。记录了反应动力学，并从晶体结构、形态、电学和光学性质方面对产物进行了研究。X射线粉末衍射证实，NiSe具有六方晶体结构，NiSe₂具有立方晶体结构，NiSe的平均微晶尺寸为10.5纳米，NiSe₂的平均微晶尺寸为13.3纳米。通过比表面积测量和粒度分布分析对它们的物理性质进行了表征。透射电子显微镜显示，所制备的材料包含形状不规则的纳米颗粒，这些纳米颗粒团聚成直径约为1 - 2微米的团簇。测量了通过球磨合成的硒化镍的电导率、电阻率和薄层电阻的初始值。使用紫外 - 可见光谱法测定得到的带隙能量值证实了它们在光伏领域的潜在用途。光致发光光谱显示了材料微弱的发光活性。正如之前对硒化铜合成所验证的那样，通过在工业磨机中球磨，可以很容易地大规模进行这种硒化镍的合成。
