Kundu Joyjit, Pradhan Debabrata
Materials Science Centre, Indian Institute of Technology , Kharagpur, West Bengal 721 302, India.
ACS Appl Mater Interfaces. 2014 Feb 12;6(3):1823-34. doi: 10.1021/am404829g. Epub 2014 Jan 27.
A simple, template-free and mild solution chemistry route was employed to synthesize diverse copper sulfide (CuS) nanostructured assemblies at 70 °C by varying the solvent (water or ethylene glycol, or their ratios (3:1, 1:1 and 1:3)). The CuS structures in the shape of spheres and nanotubes were found to be assemblies of either nanoplates or nanoparticles. The nanotube formation was elaborately studied by varying the synthesis parameters such as temperature, reaction duration, precursor's ratio, and counterions. Counterions such as NO3(-) and SO4(2-) were found to be suitable for nanotube formation whereas in the presence of Cl(-) and OAc(-) ions, CuS flake-like and nanoparticle assemblies are obtained, respectively. The optical bandgaps for the CuS with different morphologies were measured to be in the range of 1.88-2.16 eV. The bandgap of CuS in the visible region of electromagnetic radiation prompted it to be used as photocatalyst in the past under natural light. However, we demonstrate here the similar catalytic performance of as-synthesized CuS nanostructures for the degradation of methylene blue in the dark, suggesting that light does not play a role in its catalytic behavior.
采用一种简单、无模板且温和的溶液化学路线，通过改变溶剂（水或乙二醇，或它们的比例（3:1、1:1和1:3））在70°C下合成了多种硫化铜（CuS）纳米结构聚集体。发现球形和纳米管形状的CuS结构是纳米片或纳米颗粒的聚集体。通过改变合成参数，如温度、反应持续时间、前驱体比例和抗衡离子，对纳米管的形成进行了详细研究。发现诸如NO3(-)和SO4(2-)等抗衡离子适合纳米管的形成，而在Cl(-)和OAc(-)离子存在下，分别得到了片状和纳米颗粒状的CuS聚集体。测量了不同形貌的CuS的光学带隙在1.88 - 2.16 eV范围内。CuS在电磁辐射可见光区域的带隙促使其过去在自然光下用作光催化剂。然而，我们在此证明了合成的CuS纳米结构在黑暗中对亚甲基蓝降解具有相似的催化性能，这表明光在其催化行为中不起作用。
