Study On The Preparation And Optoelectronic Properties Of CdHgTe Alloy Quantum Dot/Carbon Nanotube Nanocomposites

Hybrid nanomaterials are attracting increasing attention due to their tunablechemical, electronic, and optical properties over a wide range. So far, research hasfocused on the one-dimensional structure and zero-dimensional structure. Because ofthe unique optical and electrical properties of carbon nanotubes and quantum dots, thecomposites based on the two component have great application prospects anddevelopment potential in the fields of optoelectronic devices.In this paper, a new strategy based on mercury cation exchange in aqueous phasewas used to prepare ternary CdHgTe alloyed quantum dots. Transmission electronmicroscopy, powder X-ray diffraction, EDS, UV-visible absorption spectra,fluorescence spectra were employed to analyzed particle size and distribution, crystalstructure and fluorescent properties. The results showed that the particle size,distribution and crystal structure of the CdHgTe ternary alloy quantum by Hg ionexchange Cd ions method in the aqueous phase is not change, but the nature of thefluorescence is changed, with Hg ions increases, the absorption and emission are redshifting.Furthermore, by non-covalent modification, carbon nanotubes were modified thepositively charged polymer, and by electrostatic effect, the quantum dot were graftedto the surface of carbon nanotubes, a new type of the CdHgTe near infrared ternaryquantum dot/carbon nanotubes nanocomposites were prepared, and its opticalproperties have been studied. The results show that the nanocomposites caneffectively achieve optical isolation, and can produce significant and stablephotocurrent signal. Moreover, the nanocomposites in the near-infrared light also hasa strong optical response, which makes CdHgTe ternary alloy quantum dots/carbonnanotube nanocomposites have very valuable in the photoelectric conversion device,especially in the near-infrared light.