本研究利用1H-1,2,4-triazole取代氨氣作為氮源，在真空環境下製備出氮化鎵以及氮化鎵/氧化鋅固溶體(GaN:ZnO)奈米顆粒，並研究這些奈米顆粒應用於光催化水分解反應之活性。藉由調控製備溫度、起始物比例以及起始物添加順序，我們製備出具不同鋅鎵莫耳比的GaN:ZnO，並利用多種方法對產物進行結構、成份與形貌分析及鑑定。我們發現起始物添加順序對於製備GaN:ZnO結構有很大影響，而所製備的產物中均有殘碳存在，碳則與氮或氧形成鍵結，可能會在結構中形成缺陷。光催化活性量測方面，在450 W汞-氙燈光照下，鋅鎵比為0.28的GaN:ZnO於450 °C空氣煅燒後附載Rh2-yCryO3作為共催化劑，以甲醇為犧牲試劑，在可見光(λ > 400 nm，256 mW cm^-2)下的產氫活性為4.7 μmol h^-1g^-1；而鋅鎵比為0.53的GaN:ZnO奈米顆粒，以硝酸銀為犧牲試劑，在可見光下的產氧活性為39.9 μmol h^-1g^-1。我們製備的GaN:ZnO奈米光觸媒活性較低，可能與樣品中存在的碳與結構缺陷有機會成為電子與電洞的再結合中心，致使電子電洞對無法有效分離有關。

In this study, we used 1H-1,2,4-triazole as a nitrogen source to synthesize gallium nitride and gallium nitride/zinc oxide solid solution (GaN:ZnO) nanoparticles for photocatalytic water splitting and hydrogen production. By controlling the temperature of vacuum thermal treatment and the ratio and addition sequence of metal precursors, we synthesized GaN:ZnO with different zinc-to-gallium (Zn/Ga) molar ratio. The composition, structure and morphology of the nanomaterials were extensively characterized by a variety of methods and techniques. We found that the sequence of mixing the precursors is crucial for the formation of GaN:ZnO structure. In addition, all the GaN:ZnO nanomaterials contained residual carbon that bonded to nitrogen or oxygen atom and might thus form structural defects. We studied the photocatalytic activities under irradiation with 450 W Hg-Xe lamp. The sample containing GaN:ZnO with Zn/Ga = 0.28 after further 450 oC-calcination and Rh2-yCryO3 as a cocatalyst showed the highest hydrogen production rate (4.7 μmol h^-1g^-1) in methanol aqueous solution under visible-light irradiation (λ > 400 nm, 256 mW cm^-2). The GaN:ZnO with Zn/Ga = 0.53 showed the highest oxygen production rate (39.9 μmol h^-1g^-1) in silver nitrate aqueous solution under visible-light irradiation. The relative low photocatalytic efficiency of the thus prepared GaN:ZnO nanoparticles may be associated with the presence of residual carbon and structural defects which might serve as the recombination centers of photoexcited electrons and holes.

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