The major goal of this work was to study the morphological evolution of noble metal nanoparticles such as gold, palladium, and platinum nanoparticles as a function of single-parameter variation in simple synthesis approach. As a next step, these nanoparticles were plasma oxidized to result in surface oxidized noble metal nanoparticles. These noble metal nanoparticles were further utilized for the growth of graphene shells in a chemical vapor deposition method resulting in graphene encapsulated noble metal nanoparticles. In regard to morphological evolution of noble metal nanoparticles, systematic studies were performed, where single growth parameter (temperature, metal salt concentration, surfactant type or concentration, seed amount, or growth duration) was varied while other parameters were kept constant. Gold nanoparticles were synthesized by both single-step method and seed-growth method while palladium and platinum nanoparticles were synthesized at high temperature by alcohol reduction. The size, shape, crystallinity, and sample heterogeneity for the nanoparticles were characterized by high-resolution transmission electron microscopy. Single parameter systematic studies allowed for fundamentally understanding the growth and evolution of noble metal nanoparticles. As temperature increased, nanoparticles size increased due to the decrease of absolute value of volume Gibbs free energy. With the existence of surfactant (e.g. hexadecyltrimethylammonium bromide), stabilizer molecules bind to nanoparticles surface with affinity to different facets. When synthesis temperature higher than boiling point of water, the annealing process resulted in rupture of surfactant from weak binding facets, and boosted anisotropic growth of nanoparticles. Subsequently, oxidation behavior of gold, palladium, and platinum were studied by X-ray photoelectron spectroscopy. Gold oxide, palladium oxide, and platinum oxide were found after plasma oxidation. Noble metal nanoparticles were plasma oxidized for 30 min, and then further utilized for chemical vapor deposition (CVD) of graphene shells. These graphene encapsulated noble metal nanoparticles were thoroughly characterized by scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Aggregation of noble metal nanoparticles was observed after graphene growth. Raman spectra showed D-, G-band for graphene encapsulated gold, palladium and platinum nanoparticles after CVD growth. Raman chemical mapping indicates large area growth of graphene encapsulated nanoparticles.