Condensed Matter Physics Labs: Nanotechnology and Biotechnology Research
The toxicity of nanoparticles is determined for various bacterial organisms, cancer cells and healthy cells. ZnO nanoparticles show selective toxicity to the cancer cells. The TEM image shows ZnO nanoparticles showing affinity towards attaching onto a bacteria cell. Nanoparticles of other oxides are under investigation to study these effects.
ZnO and Fe doped ZnO nanoscale materials are prepared by the forced hydrolysis route. The structure, band gap and size of the nanoparticles are affected by the concentration of Fe. This method can yield large quantities of nanoscale materials in a single step.
The size of ZnO nanoparticles is controlled by tuning the synthesis procedure. The change in size is visible in HRTEM images and confirmed by x-ray diffraction and spectrophotometry. Note how the surface to volume ratio changes drastically in the nanoscale region.