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In this work, cobalt nanoparticles were synthesized by chemical reduction procedure. After the hydrophilic functionalization, Co/polypyrrole (PPy) nanocomposites were prepared by in situ polymerization of pyrrole in aqueous dispersion of Co nanoparticles. The Co/ PPy nanocomposites show good electromagnetic properties with both magnetic loss and dielectric loss to electromagnetic wave. The electromagnetic wave absorbing bandwidth (reflection loss \-10 dB) for Co/PPy (20 wt%) is above 5.5 GHz at a thickness of 2 mm, and with a maximum reflection loss (around -20.02 dB) at 14.77 GHz. This magnetic nanoparticles/conducting polymer nanocomposites are great potential candidates for electromagnetic wave absorbent, because of their wide-absorbing frequency, strong absorption, good compatibility, low density, and controllable absorbing properties.

CuInS2/CuInS2–ZnS quantum dots showed excellent tunable photoluminescent properties, which demonstrate great potential for practical applications due to their non-toxicity and excellent optical properties.