Cadmium Selenide (CdSe), a well-known direct band gap semiconductor which absorbs a whole range of the visible spectrum, is a promising material for applications in light-emitting diodes (LEDS), photodetectors, solar cells, biomedical imaging and field-effect transistors (FETs). In particular, two dimensional (2D) geometry such as nanoplatelates (NPLs) and nanosheets (NSs) has drawn extensively attention due to their unique properties associated with its morphology. Ultrathin CdSe NSs and NPLs have been successfully synthesized using solution-based route; however, there are difficult to produce a large lateral size in the range of micrometer scale.<br/>We present the use of cation exchange to synthesize micrometer-sized single-crystal thin CdSe (NSs) difficulty to produce directly through solution-based chemistry. Starting from hexagonal-phased CuSe NSs as a template, CdSe NSs are obtained by cation exchange of copper to cadmium. This exchange reaction preserves well the 2D morphology of the starting NSs and also retains their hexagonal crystal structure. Resulting CdSe NSs have a lateral size up to 6 µm and an average of thickness approximately 5 nm. Optical properties of NSs will be further investigated. Such a large lateral dimensional size of these NSs has advantages for single sheet optical properties studies suggested for applications in optical and electronic devices.

Synthesis of micrometer-sized CdSe nanosheet via cation exchange

249th National Meeting (2015)

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