Li-doped ZnO nanorods with single-crystal quality - non-classical crystallization and self-assembly into mesoporous materials

نویسندگان

  • Carlos Lizandara-Pueyo
  • Stefan Dilger
  • Markus R. Wagner
  • Melanie Gerigk
  • Axel Hoffmann
  • Sebastian Polarz
چکیده

The exploitation of semiconductors is of utmost importance to existing and forthcoming technologies. Some have even argued that in analogy to the ‘Copper Age’ following the ‘Stone Age’, we are currently living in the Semiconductor Age. For sure, silicon is the semiconductor which is used the most in a technological context (e.g. microelectronics). However, there are various applications for which silicon is not suitable due to either its relatively narrow band-gap or its indirect band-structure. Therefore, there is large interest in wide, direct gap semiconductors like III/V compounds, for instance gallium nitride (GaN), or II/VI compounds such as zinc oxide (ZnO). Furthermore, for silicon, it is well documented that the pure compound itself is only of very limited use. Functional devices like photovoltaic cells require pand n-doped Si. Interestingly, the exploitation of doping to control the properties of ceramic semiconductor nanostructures still stands at the beginning. Most nanomaterials presented in the literature consist of the pure semiconductor, or unintentional doping with impurities has occurred. Zinc oxide, one of the most important binary semiconductors in current research, is interesting because of its multifunctional character with applications in various fields such as optoelectronics (e.g. photovoltaics, transparent electronics), cosmetics (UV protection), sensor technology (gas sensors, bio sensors) or catalysis (methanol synthesis). One-dimensional ZnO nanostructures have also attracted significant attention. Despite much recent research, important challenges remain. ZnO is intrinsically n-doped due to its tendency to form native point defects and due to the presence of residual shallow donors such as interstitial hydrogen or of Al, Ga, or In on Zn lattice sites. Major efforts have been undertaken to achieve p-doping of ZnO via partial substitution of zinc by lithium or, alternatively, of oxygen by nitrogen. The desired p-doping has often been found to be compensated by unintentional n-doping resulting from dopants being located on interstitial sites in the lattice. The development of reliable methods for the preparation of Li–ZnO colloidal particles, ultimately of nanorods, with precise lattice site control of the dopants, would thus represent a major advance. Particular importance in this context is attributed to routes leading to colloidal ZnO nanorods. A common way to prepare ZnO is to start from an aqueous solution of a Zn salt (e.g. zinc acetate), followed by the precipitation of zinc–oxo–hydroxo University of Konstanz, Universitaetsstr. 10, 78464 Konstanz, Germany.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Influence of Cr dopant on the microstructure and optical properties of ZnO nanorods

One-dimensional (1D) undoped and Cr doped ZnO nanorods with average length of 1 µm and diameter of 80 nm were synthesized using hydrothermal method where a fast growth of ZnO nanorods on the seed layer was observed. Afterwards, the effects of Cr dopant on structural, surface morphology and optical properties of nanorods were studied using X-ray diffraction (XRD), scanning electron microscopy (S...

متن کامل

Self-Assembly of Densely Packed ZnO Nanorods Grown Chemically on Porous Silicon Substrate

Self-assembly of densely packed ZnO nanorods were grown on Porous Silicon (PS) substrate by low-temperature chemical bath deposition. The structural and optical properties of the obtained ZnO nanostructure...

متن کامل

Fast UV detection by Cu-doped ZnO nanorod arrays chemically deposited on PET substrate

Well-aligned Cu-doped ZnO nanorods were successfully synthesized on polyethylene terephthalate (PET) substrate using chemical bath deposition method. The structural and optical properties of Cu-doped ZnO nanorods were investigated using X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectroscopy (EDX) and photoluminescence (PL) spectroscopy...

متن کامل

Multi element doped type-II heterostructure assemblies (N, S- TiO2/ZnO) for electrochemical crystal violet dye degradation

Herein, we report multi-element doped Type-II heterostructure assembly consists of N, S doped TiO2 and ZnO for electrochemical crystal violet dye degradation studies. Electrochemical measurements were performed on these synthesized N-S codoped TiO2/ZnO compositeheterostructured assemblies which are fabricated on Titanium (Ti) substrate. It was observed that a composite ele...

متن کامل

Encapsulation of nanoparticles into single-crystal ZnO nanorods and microrods

One-dimensional single crystal incorporating functional nanoparticles of other materials could be an interesting platform for various applications. We studied the encapsulation of nanoparticles into single-crystal ZnO nanorods by exploiting the crystal growth of ZnO in aqueous solution. Two types of nanodiamonds with mean diameters of 10 nm and 40 nm, respectively, and polymer nanobeads with si...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2014