The similar dimension of biomolecules and metallic or semiconductor nanoparticles (NPs) enables the synthesis of biomolecule and nanoparticle hybrid systems. The functions of biomolecule-nanoparticle hybrid devices have been studied in many applications such as the electrical conducting of redox enzymes with electrodes, photoexcitation of semiconductor nanoparticles ,and biocatalytic metallic nanoparticles. Furthermore, size-controlled magnetic NPs provides functionalization of carbon nanotubes and attractive DDS (Drug Delivery System)technology. The electrical, chemical (catalytic), biological properties of these hybrid systems can be optimized by controlling the size of the NPs. We have proposed the metallic doping technique to control the grain size or particle size of oxide materials such as ZnO and LiMn₂O₄. The pulse laser deposition using KrF excimer laser (248nm) was use to prepare the nanostructured materials on several substrates. It was shown that the additive aluminum dopant level has strong effect on size of grains , crystallinity and electrical properties of LiMn₂O₄. The gain size of LiMn₂O₄ gradually decreases with increase of aluminum dopant amount from 231nm to 96nm. The crystal size of ZnO thin films determined from Scherrer’s formula is in the range of 10nm-34nm depending on atmosphere oxygen pressure at fixed dopant condition(ZnO with 2%Al₂O₃). This doping size controlling technique will be applied to preparation of Fe₃O₄ magnetic nanoparticles and luminescent nanoparticles (ZnS, CdS, CdTe).

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