Zinc nanorods

Sun, B. Sirringhaus, H. 2005. Solution-processed zinc oxide field-effect transistors based on self-assembly of colloidal nanorods. Nano Lett. 5 2408-2413. 

Surface modification can also promote different photoluminescence responses to chemical species present in the environment. Li et al.48 synthesized water-soluble luminescent thiol-capped CdTe QDs and nanorods and investigated the effect of divalent metal ions on their photoluminescence behavior. They found that the trends of photoluminescence changes were almost similar for both, CdTe QDs and nanorods. Moreover, zinc ions enhanced the luminescence emission of the QDs while other metal ions (e.g., calcium, magnesium, manganese, nickel, and cadmium) caused luminescence quenching. 

Other interesting avenues are also being explored. For example, soluble 1-D coordination polymers based upon dendrimers in combination with palladium have been made 107 such soluble, low-dimensional polymers are of interest for liquid crystalline behavior and use in nanocomposites. One-and two-dimensional coordination polymers have also been used as templates for the formation of zinc oxide nanorods and... 

A seed-assisted chemical reaction at 368 K is found to yield uniform, straight, thin single-crystalline ZnO nanorods on a hectogram scale,181 Zinc oxide nanowires have been synthesized in large quantities using plasma synthesis.1 Variable-aspect-ratio,... 

Synthesis of ZnO Nanorods. In order to carry out the growth study in the absence of any capping agent, ZnO nanorods were prepared by the reaction of zinc acetate dihydrate (Zn(CH3-C00)2 2H20) and sodium hydroxide in ethanol at 100 °C under solvothermal conditions. The reaction was stopped at different times (I, 2, 3, 6, 12, 18, and 24 h), and the products were analyzed by TEM and SAXS. In a typical synthesis, Zn(CH3-... 

We have extended the method of solubilization of SWNTs to oxide nanorods. We prepared ZnO nanorods by the solvothermal decomposition of 250 mg (0.911 mmol) of zinc acetate dihydrate in the presence of 6 mL (0.102 mmol) of ethylene-... 

The ZnS nanotubes and nanorods were characterized by UV-visible absorption spectroscopy and PL spectroscopy. The inset in Fig. 2a shows the absorption spectrum of the ZnS nanotubes. The band appearing at 318nm is blue-shifted relative to that of the bulk ZnS (350 nm) [17]. Nanowires of ZnS of diameter 5 nm were reported to show an absorption maximum around 326 nm [18], An absorption band at 320 nm has been reported in the case of ZnS quantum dots [19], The PL spectrum of ZnS nanotubes given in the inset of Fig. 2b exhibits two bands, a weak blue emission at 485 nm and a strong green emission around 538 nm. The 485 nm band is attributed to zinc vacancies in the ZnS lattice. Emission bands at 470 nm [20] and 498nm [21] have been reported in ZnS nanobelts. The 538 emission band is similar to that reported for ZnS nanobelts [22] and is considered to result from vacancy or interstitial states [22,23]. 

ZnO nanoparticles were prepared by the sol-gel technique starting with zinc acetate as the precursor as described earlier [16]. ZnO nanorods were synthesized by stirring a fine powder of Zn(CH3C00)2-2H20 (Qualigens, 98.5% pure) in 100 ml of methanol at 60°C for I h, followed by dropwise addition of 0.03 M KOH (Ranbaxy) to the solution [13], The resulting solution was refluxed for 24 h to obtain the product, which was washed with ethanol and dried at 60 °C in air. 

Another application of Zinc oxide nanostructure is immobilization of uricace onto ZnO nanorod and fabrication a sensitive biosensor for uric acid detection [167], The biosensor successfully used for micromolar detection of uric acid in the presence serious interferences, glucose, ascorbic acid, and 1-cysteine. The apparent KM value for the uric acid biosensor is 0.238 mM, showing high affinity of the biosensor. Direct electron transfer of SOD at a physical vapor deposited zinc oxide nanoparticles surface was investigated [168], In comparison to SOD immobilized onto ZnO nanodisks [169], the electron transfer rate constant is small and a quasi- reversible electrochemical behavior observed. A novel... 

Ravirajan P., Peird A. M., Nazeeruddin M. K., Gratzel M., Bradley D. D. C., Durrant J. R. and Nelson J. (2006), Hybrid polymer/zinc oxide photovoltaic devices with vertically oriented ZnO nanorods and an amphiphilic molecular interface layer , J. Phys. Chem. B 110, 7635-7639. 

Another example of self-assembly of porphyrin-containing polymer was illustrated by Li et al.73 Polyacetylene functionalized with fullerene and zinc porphyrin pendant groups were synthesized by polymerizing the corresponding fullerene/porphyrin substituted alkyne monomers with rhodium(I) norbomadiene catalyst (Scheme 5.5).74 Polymers with different ratio of C60 and porphyrin were synthesized. The polymers showed photocurrent response when the thin films were irradiated with white light, which was due to the electron transfer from the photo-excited porphyrin to the C60 units. In addition, the copolymers aggregated into ellipse-shaped nanorod structures with a diameter of approximately 100 nm and a length of... 

---