Karamoschos Nikolaos, Katsamitros Andreas, Sygellou Labrini, Andrikopoulos Konstantinos S, Tasis Dimitrios
Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece.
Foundation of Research and Technology Hellas, Institute of Chemical Engineering Sciences (ICE-HT), P.O. Box 1414, Rio, 26504 Patras, Greece.
Molecules. 2024 Aug 14;29(16):3857. doi: 10.3390/molecules29163857.
Heterostructures of visible light-absorbing semiconductors were prepared through the growth of ZnInS crystallites in the presence of CdS nanostructures. A variety of hybrid compositions was synthesized. Both reference samples and heterostructured materials were characterized in detail, regarding their morphology, crystalline character, chemical speciation, as well as vibrational properties. The abovementioned physicochemical characterization suggested the absence of doping phenomena, such as the integration of either zinc or indium ions into the CdS lattice. At specific compositions, the growth of the amorphous ZnInS component was observed through both XRD and Raman analysis. The development of heterojunctions was found to be composition-dependent, as indicated by the simultaneous recording of the Raman profiles of both semiconductors. The optical band gaps of the hybrids range at values between the corresponding band gaps of reference semiconductors. The photocatalytic activity was assessed in both organic dye degradation and hydrogen peroxide evolution. It was observed that the hybrids demonstrating efficient photocatalytic activity in dye degradation were rather poor photocatalysts for hydrogen peroxide evolution. Specifically, the hybrids enriched in the CdS component were shown to act efficiently for hydrogen peroxide evolution, whereas ZnInS-enriched hybrids demonstrated high potential to photodegrade an azo-type organic dye. Furthermore, scavenging experiments suggested the involvement of singlet oxygen in the mechanistic path for dye degradation.
通过在硫化镉纳米结构存在的情况下生长硫化锌铟微晶，制备了可见光吸收半导体的异质结构。合成了多种混合成分。对参考样品和异质结构材料的形态、晶体特性、化学形态以及振动特性进行了详细表征。上述物理化学表征表明不存在掺杂现象，例如锌或铟离子融入硫化镉晶格。在特定成分下，通过X射线衍射和拉曼分析观察到非晶态硫化锌铟成分的生长。如同时记录两种半导体的拉曼光谱所示，异质结的形成与成分有关。混合材料的光学带隙介于参考半导体相应带隙之间。在有机染料降解和过氧化氢生成中评估了光催化活性。观察到在染料降解中表现出高效光催化活性的混合材料对过氧化氢生成而言是相当差的光催化剂。具体而言，富含硫化镉成分的混合材料被证明对过氧化氢生成有高效作用，而富含硫化锌铟的混合材料对光降解偶氮型有机染料具有高潜力。此外，清除实验表明单线态氧参与了染料降解的机理途径。
