A new structure of graphene-Mg₂CuSnCoO₆ composite bridged with gallic acid (GMG) was synthesized with a novel method. Band gap energy of the newly synthesized nanocomposite was evaluated with a laser-wavelength region and DRS method. Evaluation and analysis were based on the relationship among XRD, HRTEM, XPS, Raman scattering, and computer simulated model structure. Changes in the structure of graphene or graphene-based composite were associated with location changes of the valence band and the conduction band. Electron density was used to confirm the number of electrons by computer simulation. Finally, such graphene-Mg₂CuSnCoO₆-gallic acid nanocomposite was used for photocatalytic CO₂ reduction into methanol. Under UV-light irradiation, the highest methanol yield was 5.576% with 0.6 g of scavenger. This work might offer a promising strategy for measuring band gap energies of different types of semiconductors.

用一种新方法合成了一种新结构的石墨烯-Mg ₂ CuSnCoO ₆复合物与没食子酸（GMG）桥接。使用激光波长区域和 DRS 方法评估新合成的纳米复合材料的带隙能量。评价和分析基于XRD、HRTEM、XPS、拉曼散射和计算机模拟模型结构之间的关系。石墨烯或石墨烯基复合材料结构的变化与价带和导带的位置变化有关。电子密度用于通过计算机模拟确认电子数。最后，这种石墨烯-Mg ₂ CuSnCoO _{6 -}没食子酸纳米复合材料用于光催化CO ₂还原成甲醇。在紫外光照射下，0.6 g清除剂的甲醇产率最高为5.576%。这项工作可能为测量不同类型半导体的带隙能量提供了一种有前景的策略。