我們以銀奈米立方體作為模板，藉由調整調節劑與金屬有機框架前驅物濃度，能夠控制金屬有機框架於銀奈米立方體上形成的速率，並且生成兩種不同形貌的金屬有機框架-銀奈米立方體複合材料：(1) 殼層狀金屬有機框架-銀奈米立方體複合材料 (2) 角狀金屬有機框架-銀奈米立方體複合材料，並且藉由此兩種形貌之複合材料作為電漿子光觸媒，催化二氧化碳還原反應。兩種形貌之複合材料皆表現出優秀的二氧化碳吸附性(由MOF-801而起)與良好的二氧化碳還原反應性(由銀奈米立方體而起)。以臨場拉曼光譜觀測複合材料於二氧化碳吸附與二氧化碳還原的性能。相較於殼層狀複合材料而言，角狀複合材料擁有更快的二氧化碳吸附速率，這是由於角狀金屬有機框架複合材的比表面積更高導致。而二氧化碳還原的反應速率與反應機制會因為複合材料的形貌不同而改變，這是因為於金屬有機框架與銀奈米立方體介面上的反應環境不同所造成。且金屬有機框架-銀奈米立方體複合材料的二氧化反應速率對光照強度與光照波長之變化相當敏感。這是由於隨著光照強度的上升用於促進反應之熱電子之數量增加與隨著光照波長之變化熱電子分布位置於銀奈米立方體會產生改變所造成。藉由此合成法生成非均質複合材料可被用於設計並合成出各式不同形態及組成的複合材料以適用於各式催化反應之光觸媒。

Here, we fabricated two different heterogenous nanocomposites, core-shell MOF-AgNC and corner MOF-AgNC, as photocatalysts for CO2 conversion by generating metal-organic frameworks (MOFs) on silver nanocube templates. These MOF-AgNC nanocomposites showed high adsorbability (due to MOF-801) and high reactivity (due to AgNC). The performances of these MOF-AgNC nanocomposites in CO2 adsorption and CO2 reduction reactions can be characterized by in-situ Raman spectrum measurement. The corner MOF-AgNC nanocomposite exhibited a faster CO2 adsorption rate than the core-shell MOF-AgNC nanocomposite, which was due to the higher surface area/volume ratio of MOF in corner MOF-AgNC. The CO2 reaction reactivity and mechanisms (products of the reaction) of CO2 reduction depended on the morphologies of MOF-AgNC nanocomposites, which were caused by different reaction environments at the interface between MOF and AgNC. The CO2 reduction reactivity of MOF-AgNC nanocomposites also exhibited high sensitivity to irradiation intensity and wavelength, which was caused by the variation of the number of hot electrons in AgNC and their positions in AgNC with light intensity and light wavelength, respectively. This method for the synthesis of heterogenous nanocomposites should be possible to design excellent photocatalysts for various reactions by carefully designing the morphology and composition of nanocomposites.

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