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Low Dose Electron Microscopy of ZnS-Bipy based Hybrid Organic-Inorganic Materials for Energy Applications

A strong interest in organic–inorganic hybrid materials has developed lately because of the variety of options they can offer in the modulation of electronic properties. ZnS is an interesting material for photocatalysis with a good resistance to photocorrosion and adequate conduction band position. There are a few examples in the literature regarding ZnS structural surface modification by using organic aliphatic bidentate amines [1]. Additionally a recently published investigation shows the complete synthesis procedure using solvothermal methods and characterization of ZnS and ZnS–Bipy (4,4bipyridine) hybrid based organic–inorganic materials [2]. These materials are tested as catalysts in the photocatalytic reduction of 4-nitrophenol to 4-aminophenol, under UV light irradiation and show a high performance in photocatalytic activity. As for this work, the corresponding characterization by using electron microscopy is reported. Transmission electron microscopy has been performed in the TEAM 05 microscope (NCEM-LBNL) in conditions of low dose rate in TEM mode together with a routine in MacTempas ® in order to apply the exit wave reconstruction procedure with 40 experimental images. Organic substances are normally rather beam sensitive and in particular 4,4-bipyridine tends to evaporate as the sample is observed in high dose rate.