Abstract
Mercaptoacetic acid (MAA)-modified ZnO nanoparticles have been prepared at low temperature by homogeneous precipitation method, using zinc nitrate hexahydrate and hexamethylenetetramine as initial agents. The modified zinc oxide nanorods were characterized using X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), thermogravimetric (TG) analysis and photoluminescence (PL) spectroscopy. The XRD revealed the wurtzite structure of zinc oxide. The growth of ZnO crystals into rod shape was found to be closely related to its hexagonal nature. As indicated from SEM, the morphology of the modified ZnO nanorods changes with various MAA addition times. In addition, the results of TG and FT-IR confirmed the conjugation of MAA with ZnO nanorods, and the amount of carboxyl group in the samples' surface was found to be 0.1943–0.3491 mmol/g through the titration experiment. The PL spectra indicated that the optical properties of ZnO nanorods were changed with the insertion of MAA, and showed a significant improvement in intensity. On the basis of these results, one might expect that the conjugate specific biomolecules on the functional ZnO nanorods are very potential to detect the complementary biomolecules by PL detecting.
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