本研究利用人造光合成作用系統將二氧化碳還原成碳氫化合物，作為未來新興的替代性能源，以期改善愈趨被重視的環境及能源議題。本研究以溶劑熱法混合界面活性劑合成二硫化錫與硫化銅，由於兩種材料的能隙大小與位置適合讓二氧化碳還原反應發生，且以異質接面方式混合兩種半導體材料，能夠有效的將激發後所產生的電子與電洞分離，降低電子-電洞輻射再結合的現象，使其有較多的激子飄移至材料表面進行二氧化碳還原反應，並利用界面活性劑，證明能夠增加粒子的分散性、結晶性，提升二氧化碳還原反應的效率。在本研究中，首先分析晶體結構、成分及光學性質等特性，再利用氣相層析，發現二硫化錫與硫化銅異質結構能夠產出乙醛與極微量的乙醇和甲醇，可達到約0.061%，藉由控制二硫化錫、硫化銅的混合比例來優化反應效率，並混合界面活性劑與其異質結構配合，能夠獲得更高產量的乙醛產物，並有效地提高光化學量子轉換效率；在不同比例下，本研究發現以莫耳比1:1的比例混合二硫化錫與硫化銅並混合莫耳比2莫耳的陽性界面活性劑CTAB，相較於其他比例，光化學量子轉換效率能提高至0.313%，從此研究，證明利用p-n異質接面結構方法並搭配界面活性劑，能增加二硫化錫與硫化銅分散的均勻度，縮小其粒子半徑及提升結晶性，並有效提高光觸媒在二氧化碳還原反應上的效率。

This study uses an artificial photosynthesis system to reduce carbon dioxide to hydrocarbons as an alternative energy source with an aim to improve the environmental and energy issues. In this study, the solvothermal method using Sn, Cu, S with different mixed surfactants was used to synthesize tin disulfide and copper sulfide. The energy band gap and position of the two materials are suitable for carbon dioxide reduction reaction, and the two semiconductor materials can be mixed as hetero-junctions. It can effectively separate electrons and holes after excitation, reduce the phenomenon of electron-hole radiation recombination, and make more excitons drift to the surface of the material for carbon dioxide reduction reaction. We use the surfactant and prove that it can increase the dispersibility of particles, enhance crystallinity, and improve the quantum efficiency of carbon dioxide reduction reaction. In this study, first we analyze the characteristics of crystal structure, composition, and optical properties, and then perform gas chromatography studio. We found that the hetero-structure of tin disulfide and copper sulfide can produce acetaldehyde and small amounts of ethanol and methanol. With the photochemical quantum conversion efficiency up to about 0.061%. The reaction quantum efficiency was optimized by controlling the mixing ratio of tin disulfide, copper disulfide and changing the surfactant. By mixing the surfactant with its hetero-structure, a higher yield of acetaldehyde product can be obtained effectively. Compared with different ratios, photochemical quantum conversion efficiency can be increased to 0.313% with tin sulfide and copper sulfide mixed in a ratio of 1:1:2 with the cationic surfactant CTAB. From this study, it is proved that p-n hetero-junction structure with surfactant can increase the uniformity and dispersion of tin disulfide and copper sulfide, enhance crystallinity, and improve the photocatalyst carbon dioxide reduction reaction effectively.

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