Synthesis of amino acid polyoxometalate hybrid nanotubes under solid-state chemical reaction at room temperature

Four novel amino acid (l-isoleucine (ILe) and l-cysteine (Cys)) polyoxometalate nanotubes ((ILe)3PMo12O40·3H2O, (ILe)3PW12O40·3H2O, (Cys)3PMo12O40·3H2O, and (Cys)3PW12O40·3H2O) are successfully synthesized by solid-state chemical reaction method at room temperature. Elemental analysis, infrared spectroscopy and XRD analysis results prove that the samples still possess Keggin type structure. Transmittance electron microscopy (TEM) and scanning electron microscopy (SEM) have shown that the samples have nanotube structures with diameter about 20–200 nm and length of up to several micrometers.